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HomeMy WebLinkAboutEnovity Report- Building Energy StudyTDPUD Building Energy Use Assessment and Improvement Study 11570 Donner Pass Road Truckee, CA 96160 Final Report January 15, 2010 enovity Building Energy Use Assessment and Improvement Study Final Report 11570 Donner Pass Road Truckee, CA 96160 Prepared For: Truckee Donner Public Utility District Prepared By: enovity 11290 Point East Drive, Suite 215 Rancho Cordova, CA 95742 (916) 853-1718 January 15, 2009 Project Number 0309-042 Copyright © 2010 Enovity, Inc., All rights reserved. Table of Contents 1 EXECUTIVE SUMMARY............................................................................................ 3 2 BUILDING DESCRIPTION......................................................................................... 5 2.1 ENVELOPE CONSTRUCTION............................................................................................................5 2.2 BASIS OF OPERATION.................................................................................................................... 7 2.3 SUMMARY OF SPACE CONDITIONING EQUIPMENT............................................................................ 7 2.3.1 Administrative Building Equipment.......................................................................................... 7 2.3.1.1 Fan Coil Design Summary............................................................................................................7 2.3.1.2 Fan Coil Current Operation Summary..........................................................................................9 2.3.1.3 Exhaust Fan Summary .................................................................................................................9 2.3.1.4 Direct Expansion Cooling Equipment (As Designed) Summary....................................................9 2.3.1.5 Direct Expansion Cooling Equipment (Currently Installed) Summary.........................................10 2.3.1.6 DX Systems Sequence of Operation..........................................................................................10 2.3.1.7 Administrative Building Heating Plant Summary.........................................................................10 2.3.1.8 Heating Hot Water Boilers Design Sequence of Operation.........................................................12 2.3.1.9 Heating Hot Water Boilers Current Sequence of Operation........................................................12 2.3.1.10 Domestic Hot Water Summary...................................................................................................12 2.3.2 Operations and Maintenance Building Equipment................................................................ 13 2.3.2.1 Garage and Warehouse Space Heater Summary......................................................................13 2.3.2.2 Exhaust Fan Summary ...............................................................................................................14 2.3.2.3 Warehouse Ventilation Summary ...............................................................................................14 2.3.2.4 Warehouse Office Fan Coil Design Summary............................................................................14 2.3.2.5 Warehouse Office Fan Coil Current Operation Summary...........................................................14 * Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 2.3.2.6 Warehouse Office Space Cooling Summary...............................................................................15 2.3.2.7 Domestic Hot Water Summary...................................................................................................15 2.3.3 System Set Points................................................................................................................. 16 3 HISTORIC ENERGY CONSUMPTION AND BENCHMARKING .............................17 3.1 UTILITY BILL ANALYSIS................................................................................................................ 17 3.2 CAL ARCH BENCHMARKING..........................................................................................................20 3.3 ENERGY STAR BENCHMARKING....................................................................................................21 4 ENERGY USE ANALYSIS/DEFICIENCY LOG........................................................23 4.1 BUILDING ENVELOPE...................................................................................................................23 4.2 HVAC SYSTEMS......................................................................................................................... 23 4.3 DUCT SYSTEMS...........................................................................................................................24 4.4 LIGHTING....................................................................................................................................25 4.5 HEATING HOT WATER SYSTEM....................................................................................................25 5 ENERGY CONSERVATION MEASURES................................................................ 27 5.1 METHODOLOGY...........................................................................................................................27 5.2 SUMMARY OF RECOMMENDED ENERGY EFFICIENCY MEASURES .................................................... 27 5.3 CAPITAL MEASURES RELATED TO ENERGY EFFICIENCY................................................................. 30 6 OPERATIONAL MEASURES...................................................................................31 6.1 OPERATIONS AND MAINTENANCE MEASURES................................................................................ 31 6.2 OCCUPANT COMFORT MEASURES................................................................................................ 32 6.3 SUMMARY OF ISSUES...................................................................................................................33 APPENDIXA: ....................................................................................................................... 35 APPENDIXB :.......................................................................................................................45 APPENDIXC :....................................................................................................................... 51 Page 2 Copyright © 2010 Enovity, Inc., All rights reserved. enovity 1 EXECUTIVE SUMMARY Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 This report presents the results of a building energy use study and evaluation of potential improvements to reduce energy consumption and related operating costs for a dual level facility comprised of one administrative and one operations building located at 11570 Donner Pass Road in downtown Truckee, California. This study was undertaken by Enovity, Inc. in 2009 for the Truckee Donner Public Utility District (TDPUD). The site survey activity along with utility bill analysis confirmed building envelope, lighting, HVAC and domestic hot water systems energy performance. Utility bills, measurements and trend data on equipment were used to develop an energy use breakdown. Energy loads and energy efficiency measures were evaluated using pertinent energy and equipment data and spreadsheet calculations. Implementation costs and annual energy savings were estimated and used to calculate simple payback period which forms the basis of recommending measures. The report describes eleven Energy Efficiency Measures (EEMs). Eight of the measures have a simple payback period less than five years and three measures have a payback period less than 10 years. However; when all measures are combined, the cost savings will yield a very reasonable payback. The total electricity savings from the combined measures is estimated to be 10,600 kWh/yr. The total natural gas savings is 9,900 therms per year. The combined annual energy cost savings for all Energy Efficiency Measures is $7,513 and the estimated implementation cost is $17,706, giving an overall simple payback of 2.4 years. Table E.1. Summarizes the various measures recommended for this building. Energy Efficiency Measures (EEMs) are low cost measures which will result in measurable energy savings and have a shorter payback period. Capital Measures (CMs) are measures with energy efficiency benefit that have a higher cost. Operational and Maintenance Measures (O&Ms) are measures resulting in minimal energy impact but with the potential to provide the building with enhanced comfort and/or operational efficiencies. Occupant Comfort Measures (OCMs) are measures whose main purpose is provide occupant comfort and may result in negligible changes or increases in energy use. Any issues found during the investigation process are summarized in Section 6.0 of this report. Page 3 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Table E.1: Energy Efficiency Measures and Estimated Savings Electric Estimated Energy Peak Electric Gas Energy Total Energy Simple System Measure No. Measure Description Project Cost ($) Savings Savings Demand Savings Savings Cost Savings Payback (kWh yr (kW) (therms/yr) ($/yr) (years) Energy Efficiency Measures HHW EEM 1 Isolate Non -Operating Boiler $200 200 0 1,200 $700 0.3 HHW EEM 2 Install an Automatic Stack Damper on $1,500 0 0 800 $500 3.0 Boiler 2 HHW EEM 3 Adjust Boiler Gas Pressure for Increased $1,060 0 0 300 $200 5.3 Combustion Efficiency IR Heaters EEM 4 Insulate Garage Doors $1,800 0 0 600 $400 4.5 Lighting EEM 5 Warehouse Occupancy Lighting Control $2,300 4,000 0 0 $500 4.6 Lighting I EEM 6 Garage Occupancy Lighting Control $2,100 3,100 0 0 $400 5.3 Lighting I EEM 7 O&M Office Occupancy Lighting Control $1,750 1,700 0 0 $213 8.2 Lighting EEM 8 Administration Building Occupancy Lighting $900 1,600 0 0 $200 4.5 Control IR Heaters EEM 9 Schedule the operation of the IR heaters in $2 828 0 0 1,600 $1,000 2.8 the Garage Warehouse EEM 10 Schedule the operation of the UHs in the $1,131 - - 3,000 1,900 0.6 UH Units Warehouse, reduce setpoint to 65 Warehouse Warehouse Install circulation fans to reduce Units EEM 11* temperature stratification in the heating season $2,136 - - 2,400 $1,500 1.4 SUB -TOTAL $17,705 10,600 0 9,900 $7,513 2.4 EEM 11 is calculated independent of any changes in temperature setpoint Capital Measures Boiler CM 1 Condensing Boiler Installation $55,000 _ - 5,764 $3,574 15.4 HVAC CM 2 DDC System Installation $204,000 - - - - - SUB -TOTAL $259,000 0 0 5,764 $3,574 72.5 Operation and Maintenance Measures Fan Coils O&M 1 Rebuild Zone Valves $2,200 _ _ 648 $402 5.5 Fan Coils O&M 2 * Repair Fan Coil Damper Actuators, Install $2 900 _ _ _ Gravity Dampers / Ventilation Grilles Fan Coils O&M 3 * Assure Fan Coil Operation During Occupied Hours Fan Coils O&M 4 ' Designate Single Person for Administrative Building Thermostat Control Fan Coils O&M 5 * Repair Fan Coil 10 (serves locker room) $848 Fan Coils O&M 6 * Repair Fan Coil 13 (serves warehouse $848 offices) Boiler O&M 7 * Repair Boiler Controls $1,425 Ventilation O&M 8 * Repair Dampers for Warehouse Ventilation $162 Ventilation O&M 9 * Re -enable CO Sensor Control of Exhaust $810 - - Fans SUB -TOTAL $9,193 0 0 648 $402 22.9 * The energy impact of these measures could not be calculated witnin an aceptable level of accuracy, as they are dependant on multiple factors related to their implementation. Occupant Comfort Measures Ventilation OCM 1 Fan Installation to Achieve Minimum CA $4,207 _ Ventilation OCM 2 Repair Dampers and Rebalance Building $11,033 _ Cooling OCM 3 Install an Evaporative Cooler on the $61,336 _ Administration Building Cooling OCM 4 Install Mechanical Cooling Equipment $75,663 _ Cooling OCM 5 Install an Evaporative Cooler on the $1 232 _ Warehouse SUB -TOTAL $163,474 - - - - - * OCM 3 and OCM 4 are mutually exclusive, only one will be implemented Page 4 Copyright © 2010 Enovity, Inc., All rights reserved. enovity 2 BUILDING DESCRIPTION Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 This section provides a description of the building, lighting system, HVAC and domestic hot water systems. It also documents any of the environmental or system operational requirements, including the intended sequence of operation and areas in which the building is not being operated according to the original sequence. 2.1 ENVELOPE CONSTRUCTION The TDPUD facility is located at 11570 Donner Pass Road in Truckee, California. The TDPUD facility is comprised of two buildings, an administrative building and an operations/maintenance building, as well as an unconditioned enclosed breezeway between them. The facility consists of approximately 40,550 square feet of conditioned space. The shared foundation for these buildings is a poured concrete slab. These buildings were constructed over a period of 2 years from 1985 to 1987. There were some value engineering driven changes implemented during the building process; not all of the design elements that are indicated in the design documents are actually incorporated into the building. The administrative building is 2 X 6 post and beam construction with dual pane windows and R-19 cavity insulation. There is no existing documentation detailing the roof construction; Title 24 standards required a minimum of R-30 attic insulation at the time of construction and visual inspection indicates that the roof of the administration building is a reflective elastomeric roof membrane. In addition to the insulation within the building structure, the ceiling tiles are insulated and there are additional fiberglass batts that are piled above the ceiling near the building southern exposure. These additional insulating features are detailed below in Figure 2.1 Figure 2.1: Insulation in Addition to Title 24 The administrative building spaces are primarily office space, but also include a kitchen, large conference room for board meetings, small conference room, IT spaces, restrooms, and a boiler room. The boiler room is located on the second floor of the administrative building. Space heating, ventilation, and limited space cooling via outside air for the office spaces is provided by ducted fan coils located in the plenums above the T bar ceiling. Page 5 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Exhaust is provided by ducted fans located in bathrooms and locker rooms. Outside air and exhaust is ducted to grilles located on the roof of the O&M building The operations and maintenance (O&M) building is concrete tilt up construction, with 8.5 inch uninsulated walls and 6 inches of foil faced fiberglass insulation in the roof. The O&M building's spaces are mostly used for equipment warehousing or maintenance, but do include some offices within the warehouse area. The warehouse is located in the central portion of the building, with the garage adjoining the warehouse on two sides. The roofing for the warehouse is a reflective elastomeric membrane. The only fenestration features in this building are four small skylights located on the warehouse roof and the windows that are built into the garage doors. The maintenance space is comprised of east and west wings that house Electrical Vehicle and Water Vehicle Garages, respectively. These maintenance spaces include several uninsulated roll up garage doors. The Garage spaces have a standing seam metal roof over rafters with insulating batts in the space between rafters. This construction is detailed in the following figure. The O&M building office spaces are entirely enclosed by the warehouse portion of the building. Figure 2.2: O&M Building Garage Roof Construction The entire facility is provided with emergency power by a Caterpillar D-150 generator. This genset is powered by diesel fuel. There is no on site diesel storage other than the internal Caterpillar tank. Page 6 Copyright© 2010 Enovity, Inc., All rights reserved. enovity 2.2 BASIS OF OPERATION Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 The TDPUD administrative building is scheduled for office occupancy, with fan coils operating from 8 AM- 5 PM, M-F, and operating on a setback heating/cooling schedule during unoccupied hours. There is no humidity control and outside air ventilation is provided only when the fan coils are operating in cooling mode. In cooling mode, they are designed to be supplied by 100% outside air otherwise they circulate mostly return air drawn in from the plenum. The intended space pressurization requirements for the office building are generally expected to be slightly positive during occupied mode. The space conditioning for the O&M building is not scheduled, with the exception of the office fan coils and the twist timers on the garage infrared heaters. The spaces in the O&M building are designed for heating only. This heating equipment is operated by manual adjustment of analog thermostats, with the exception of the fan coil unit in the warehouse offices. There is no active ventilation or cooling incorporated into the original design. The temperature control of each space is controlled independently of its adjacent spaces. The as -found temperature setting for the warehouse heaters was 70 degrees F. All of the garage spaces in the O&M building are controlled to 50 degrees. There is no humidity or space pressurization control of the O&M building. The breezeway space between the two buildings has an exhaust fan at either end that is controlled by a dedicated analog thermostat which triggers the exhaust of breezeway air once air temperature exceeds the thermostat setting. These thermostats are not scheduled according to building occupancy; they operate at a manual setpoint at all times. The as -found setpoint was 75 degrees, but building staff indicated that there is no standard setpoint for this equipment. 2.3 SUMMARY OF SPACE CONDITIONING EQUIPMENT 2.3.1 Administrative Building Equipment This section provides an overview of the space conditioning systems in the administrative building of the TDPUD that provide temperature control or ventilation. The majority of the equipment, including all of the fan coils, is equipment that was originally designed into the building. Deviations from the original mechanical schedule are noted by separate summary sections for design and for current operation. 2.3.1.1 Fan Coil Design Summary There are a total of 19 fan coils serving occupied spaces in the administration building. These fan coils are located in the first and second floor office plenums. All fan coils are controlled by Honeywell brand wall thermostats, model number 9207. Final air distribution is accomplished by Constant Volume (CV) square and slot diffusers. The specifications for these units are given in the following table. Page 7 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 b b b h m LE }5 N � � S� E J v L U m C LO CO N N N In Lq N Un Lq CO N In N N m IN In 0 0 1ILL }OO d d d d d O O O O O O O O O O O O O O O 3$ N a O In d . d . d N d N d . d . d M 0 LP 0 M 0 7 0 4) 0 M 0 IN 0 N 0 LP d N 0 LQ 0 N 0 q d 4p C CC � N C N CC N CC N CC N CC N CC N CC N CC N i6 N FT 2 b 2 b 2 b 2 b 2 b 2 b 2 b 2> bb 2 b > b > b > b 2 b 2 b 2 el 2 2> bb 2 GT G4_ 01 o 0 g 0 �? 0 0 0 0 0 A3A 0 0 3 0 0 0 0 A 0 `$ 0 9 0 0 9 0 0 0 9 of 8 0 0 0 029 0^ o c9 0 0 N `-' a F$ 8 8 8 8 8 8 8 8 8 �� yN L] N S c0 S (O CO CO (O [O pC) N X (O (O CO N LZ LU 00 E m M V (`� 7 N N yr V O. ii � 1 1 r� O ram, �Nj N {M� {� {LL�7 {(�O ryh Page 8 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 The control of the ventilation and of the space conditioning is designed to be accomplished by different control equipment. Design documents indicate that the fan control is to be accomplished by time clock. Heating and cooling is to be controlled by a wall mounted thermostat. Heating is accomplished by opening a HHW valve and allowing flow through the coil. Cooling is to be accomplished by closing plenum dampers and forcing the unit to draw outside air rather than return air. The only guidance to fan coil setpoints found in the design documentation is that the unit should have a heating setback setpoint of 60 degrees F. 2.3.1.2 Fan Coil Current Operation Summary The current heating and cooling operation of the fan coils is as designed, with the exception that 4 of the units have had direct expansion (dX) cooling coils added in order to augment the original cooling capacity. The ventilation, however, is controlled by the wall thermostat rather than the time clock that was originally called for. One of the fan coils originally specified for this building was never installed due to a design revision. The HHW plumbing is run to the intended position in case the unit is installed at a later date. The as -found settings for each thermostat varied, but the most common setting found is given in the following table. Table 2.2: Administration Building Thermostat Mode Heating Initiated Cooling Initiated Occupied 68 72 Unoccupied 55 90 A full summary of the as -found conditions of the fan coil thermostat settings can be found in Section 2.3.3, Table 2.14. 2.3.1.3 Exhaust Fan Summary There are a number of small exhaust fans that are utilized to remove restroom and locker room odors from the administration building. These fans are detailed in the following table. These fans' operation is controlled by manual switches that also control the bathroom lights. Table 2.3: Exhaust Fan Summary Nominal Design Equip. cty Area/ System ManufacturerEquip. Model Fan Type Fan Dive Motor Design Air Flow Static Wminal Comments /Features ID Location Served Number Type Sze ( ) Pressure Voltage (Fjp) (indtF120) Locker Foom Adninistration �� 2 Ran r Zephyr Z-12 C�ntrif ugal Bel[ 1/3 500 0.40 120 Activated by light switch Renum Locker Fborrs Rest Fmom Adninistration B=5 5 R1?nn Zephyr Z-10 Centrifugal Belt 1/6 200 0.30 120 Activated by light switch Renuns Locker Fborrs I 2.3.1.4 Direct Expansion Cooling Equipment (As Designed) Summary The design calls for a single DX unit to be installed to provide computer cooling. Detail on this unit is given in the following table. Page 9 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Table 2.4: As Designed AC Unit Summary Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Equip. Equip. Area / System Refrigerant Nominal Full Load Num of Cooling Cool Comments/ ID Location Served Nlamdacturer Nlodel Number Unit Type Type Voltage Amps Phases Cap' Effic. Features (Tons) (EEI�§ Comer CRAG1 Cornputer Room Liehert Challenger CRAC R22 208 47 1/2 3 2.5 - Replaced in 1999 2.3.1.5 Direct Expansion Cooling Equipment (Currently Installed) Summary Space cooling within the administrative building was originally intended to be provided by outside air alone. As some building occupants have found this level of cooling inadequate, direct expansion equipment has been added. This equipment includes evaporator coils that have been added to existing fan coil units, window air conditioning units, and a replacement for the original (obsolete) computer room cooling unit. If this unit should need replacement, a unit with an ECM fan motor should be considered for increased energy efficiency. Periodic reassessment of the cooling needs of the equipment may allow for energy savings by increasing the temperature at which the equipment operates. This is a decision that must be well coordinated with the IT professional tasked with maintaining the computer systems if savings are to persist. The evaporator coils in the conservation and accounting offices are controlled by the thermostat associated with the fan coil in which they are located. The window air conditioning units are controlled manually and operate during scheduled business hours in peak cooling season. The computer room cooling unit operates on an as -needed basis. The following table gives a summary of the direct expansion cooling equipment that is currently in operation within the administration building. Table 2.5: Summary of Currently Installed Direct Expansion Cooling Equipment Equip, Equip. Area / System Refrigerant Nominal Full Load Num. of Cooling Cod Comments/ ID Location Served Manufacturer Nlodel Number unit Type Type Voltage Amps Phases Cap. Mc. Features (Tom (EEM AG1 Outdoors Corsenetion Office - 1996E20857 Split DX- TXV R 22 208 10 315 3 - - AO-2 Outdoors 2nd floor east offices York H1RD036S25B Split DX R 22 208 10 1/5 3 3 - AC-3 Outdoors 2nd floor east offices - 500EHO304 Split DX- TXV R 22 208 10 315 3 3 - International Uses a Carrier AC4 Outdoors Board Room Erniromnental 16HB41S Split DX R22 208 557 1 - - 568EJO 48000 Carporatian ACAA Condensing Urtit VVU-1 Hdl� Office Fyitsu - Wndow AC R410 208 20 1 1.25 12.0 ey VVU-2 na Office FAA085P7A VVirdaNAC R22 115 7 1 0.67 10.8 Schlosser El�trdux VVU3 Joe Fbneth gfice Frigidaire/ FAA085P7A Wrd vAC R22 115 7.1 1 0.67 10.8 Electrolux VVU4 Cfice LG IVVI-D6500SR Wrdav AC R22 115 6 1 0.54 9.7 FidSteN gh VVUS Jim Wilson Cffioe LG I VUAndav AC R22 115 6.1 1 0.54 9.7 VVU-6 Kathy Neus Office Admiral AAWF-I-LJ Wrdow AC R22 115 44/5 1 0.45 10 VVLL7 Neil Kauffman Office Whirlpool A00088KIRD VNrxiaev AC R22 115 7 1 0.67 10.8 2.3.1.6 DX Systems Sequence of Operation While the control device is different for each of the pieces of equipment listed above, the sequence is the same. Upon a call for cooling, the refrigerant compressor and condenser fan/capillary tubes are enabled. 2.3.1.7 Administrative Building Heating Plant Summary Space heating is provided by natural gas boilers situated in the administrative building boiler room. The heating hot water boilers operate to provide hot water to the fan coil heating coils. Tables 2.6 and 2.7 give a summary of Page 10 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 the heating hot water boiler system installed in this facility. Table 2.6: Heating Hot Water Boiler Summary Equip. ID Desaip Equip. Location Area System Served Manufad:. Model Nmber Fuel Type Fleating Output Type Input Temp (F) Output Temp (F) Design FMVRow (gpm) Year Installed VFD lYsign Pros. ig (P-ig) Design Wating Input (ME" Design Fleeting output (ME" Full Load E fic, Operating Flours Comments /Features Cffice Rated efficiency given to i�l�[ural Admristrahve $aaces Rte VU�[er IV�tural 5 AM- 6 the left, on sde flue gas &1 Draft Building 2nd Heat- W Cos Ftl Viler 140 160 90 1986 hb 125 630 506 80.3 % FM fv}F analysis indicates an FI �r g opera[" efficiency of 78 cfr- I61ura1 Adnirtistrative Rte V.- N tural &2 Craft Building 2nd Bui�ldng Fpater 63 W Ces Fu Voter 140 160 90 1986 f� 125 630 506 80.3 % IWA Raor tt hng Table 2.7: Heating Hot Water Pump Summary Pump sign Area/ Design Motor Equip. ID Descript. System Lotion ca Manuf. Model Nimber Pump Type Motor Size Operating Flours Row Ibte Mead (Feet Speed Comments / Features Served (Hp) (GPM ( ) w.c) RPM ( ) Continuous These pumps were Mein / Boiler Rinary Adninistration when rrain / originally specified as MNR1 Backup Loop Building Armstrong 1.5 B4250 BF Centrifugal 3.0 norlewhen 60 120 3,500 B&G 1535, size 3510 Second Roos- backip Pumps @ 90 GFM OY we Adninistration ro/ Mbin ain / Baler Rimary F P-2 Bolding Armstrong 1.5 B4260 BF Centrifugal 3.0 Continuous 60 120 3,500 Loop Second Roar Figure 2.3: HHW Boiler Schematic Diagram Page 11 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 2.3.1.8 Heating Hot Water Boilers Design Sequence of Operation The HHW loop was designed to operate with a reset schedule in order to be able to conserve energy when heating demand is low. This reset was to be accomplished by using outside air temperature to control a three way valve. The boiler and pump were to be enabled whenever outside air temperature dropped below 60 F. The reset schedule is detailed below. Table 2.8: HHW Loop Temperature Reset Schedule Outside Air Temperature Hot Water Loop Temperature Below 30 F 180 30-40 F 165 40-50 F 150 50-60 F 140 Above 60 F Boiler and Pump Off 2.3.1.9 Heating Hot Water Boilers Current Sequence of Operation The heating hot water boilers operate continuously during the heating season. The exact duration of this season varies by year, but was taken to be from October 1 through May 1 for the purposes of analysis. The sequence of operation for the boilers is to fire once the HHW supply temperature falls below setpoint and continue firing until the HHW supply temperature is above a certain setpoint. The boiler is currently set to fire once the supply temperature drops below 152 and to stop firing once the supply temperature reaches 159 F. A graph of this operation is shown in Appendix B. Both the fire enable and stop firing setpoint are manually set at the unit aqua stat. There is no active control of boiler return temperature, but logger data confirms that the return temperature is consistently above 140, eliminating the danger of flue gas condensation. The current operation is for one of the boiler and its associated pump to operate continuously throughout the heating season. Each boiler and pump is controlled by a manual switch. Lead/lag operation is accomplished by manual switching once a year. A time clock has been installed with the intent of enabling and disabling the boiler according to building occupancy. This time clock is set to allow operation from 5 AM — 6PM, Monday through Friday. Logger data analysis indicates that this time clock is not currently controlling boiler operation. There is a three way valve located between the boiler and building portion of the loop. Functional testing confirmed that the valve is not responsive to temperature fluctuations at the controlling sensor. It is currently set at the fully open position. In addition to the time clock, there is a Johnson Controls series 350 electronic temperature controller with stage and digital display modules installed. Staff interviews indicate that these were installed without sufficient documentation for staff to understand their function. They have been bypassed as a result. 2.3.1.10 Domestic Hot Water Summary Domestic hot water is provided by dedicated electric hot water heaters. There are two 6 gallon electric water heaters serving restrooms on the first and second floor, respectively. There is also a larger 75 gallon hot water heater serving the kitchen, showers, and restrooms on the west end of the building. Detailed specifications for these heaters are given below. Page 12 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Table 2.9: DHW Heater summary Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 DTeeig Equip. city Manufac Model Type Type Design Heating Full Load Water Water Storage Corrrrtents/ ID Location Location Nm Number (. Output (Kw) Bfic. (°/a Storage Size (Gallons) Features Utility DFNV--1 1 Closet - State P6610MSK0 Electric Adjustable 1.44 100 Interral 6 Dunnistairs Industries Resistance Restroo rs Utility DFNV--2 1 Closet - State P6610MSK0 Electric Adjustable 1.44 100 Internal 7 Upstairs Industries Resistance Restroorns Janitor's Clock ric DFNV--3 1 LerRoom Marathon MR75245 B Rust Acliustable 4.50 100 Internal 75 Area 2.3.2 Operations and Maintenance Building Equipment This section provides an overview of the space conditioning systems in the O&M building of the TDPUD. Deviations from the original mechanical schedule are noted by separate summary sections for design and for current operation. 2.3.2.1 Garage and Warehouse Space Heater Summary Space heating is achieved primarily through radiant heat in the garages and forced convection unit heaters in the warehouse. This space heating equipment uses natural gas to heat the space directly; there is no hot water loop for the Garage or Warehouse spaces. All warehouse space heating equipment is mounted at a level of approximately 30 feet and controlled by non-scheduled analog thermostats that are located at operator level. All unit heaters are set to maintain a temperature of 70 F. Unoccupied operation is set by hand at the end of every shift. In the Garage Bays, half of the infrared heaters operate as needed to maintain space temperature. The other half operate as needed once enabled by twist timers. These twist timers are intended to limit heater operation to times when the spaces are occupied. A summary of this space heating equipment can be found in the following table. All infrared heaters are set to maintain a temperature of 50 F. Table 2.10: O&M Building Space Heating Equipment NDminal Design Design Design Equip' C+ty Description Area Location Manufacturer Model Fan Size Air Fleatin Fleating Pbminal Operating 1-burs Comments / Features ID Served (Fp) Flow g Input Output Voltage (CFM) (ME" (ME) Warehouse Continuous during heating CFMcalculated froma.rrent L1+1 4 Unit Heater Warehouse Cd1ing Fbzrar SC4 150 0.33 2,000 150 120 120 season. Nbnual night Fbznor model dies capac shutdown or setback Wienever garage IF�1 20 Infrared Garages Garage Won 7EB38A NA NYA 63 50 120 tenperature e below Hlf of these units are enabled Rater Ceiling F by twist tirrer Work areas outside of the O&M building main office are heated by means of small electrical resistance heaters. The majority of these heaters are supplied and operated at the discretion of individual employees. Due to the variable and minor role that these units play in building energy consumption, no summary of these units has been generated. Page 13 Copyright© 2010 Enovity, Inc., All rights reserved. enovity 2.3.2.2 Exhaust Fan Summary Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 There are no exhaust fans in any warehouse space, including the office spaces. The garages are each served by exhaust fans which were originally enabled by high levels of carbon monoxide as measured by two sensors in each garage. In addition to the main exhaust fans, there are several fans dedicated to exhausting smaller spaces. A summary of these fans is given in the following table. Table 2.11: O&M Building Exhaust Fans NDrninal Design Air Design Equip. Equip. Area/ System Model Fan Drive Motor Static Nominal Comments / ID City Location Served Manufacturer Number Fan Type Type Size Row ( ) CFM Pressure Voltage Features NO (inch 1-20) Eand W Originally controlled by EF-1 4 Warehouse Garages LorerrODdc OQ/-4 Sze 180 G rtrifugal Belt 1 3,500 0.30 208 OD sensor, presently Walls decor-nissioned K/hi2 nceA20�B 1 Fbof o Loren -Cool( Centrifugal Belt 1/6 1,300 0.25 120 Analog therrrostat BF-3 2 Breezeway Breezeway ILG Ra/183 Ropeller Drect Love 1/4 1,500 0.13 208 control Original ff7Original 6 1 ne ata. Generator Zephyr Z-8 Centrifugal Belt 1/8 100 0.30 120 Nit currently used 2.3.2.3 Warehouse Ventilation Summary The warehouse uses a passive ventilation system consisting of parallel blade dampers mounted approximately 30 feet above grade controlled by an analog space temperature sensor mounted at occupant level. This system is designed to enable hot air to escape the warehouse via bulk convection and stack effect. 2.3.2.4 Warehouse Office Fan Coil Design Summary In the original design, the warehouse offices were to be served by two fan coils. These fan coils did not have any mechanical cooling capacity. A summary of these units is given below. Table 2.12: As Designed Fan Coil Summary Original Design Design Fleating Supply Fan Supply Fan Equip. ID ID Area/ Manufad. Model Airflow OSA CapacityMotor Supply Fan Size static Comments /Features Number Served Number (CFM) (CFM) (ME" Drive Type (PP) I.S. (in. h20) FG13 3D Warehouse IFG 12FB1 950 95 35.0 Belt Riven 0.5 0.5 FO-14 2C Varehouse Offio IFC 81-13-2 700 70 25.0 Belt Driven 0.3 0.5 lhit never installed 2.3.2.5 Warehouse Office Fan Coil Current Operation Summary Space heating in the enclosed offices is accomplished by a single dedicated fan coil unit (Unit 13 in the above table). The heating that is provided by this unit has been deemed excessive by occupants, leading them to disable the unit and use improvised cardboard blanking plates to keep fan coil airflow from entering their workspace. The thermostat for all of the offices is located within the office nearest the crew break room. Page 14 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Figure 2.4: Improvised Blanking Plate w 2.3.2.6 Warehouse Office Space Cooling Summary Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 .A" In the original design, there was no provision for space cooling within the O&M building offices. Space cooling in the enclosed offices is currently accomplished by window air conditioning units. These units' temperature settings and operation is at the discretion of the individual employees within the area served each individual unit. These window units reject heat into the warehouse space. A summary of these units is given below in the following table. Table 2.13: Summary of Currently Operating Direct Expansion Cooling Equipment Equip. Equip. Area / System Refrigerant Nominal Full Load Num of cooling cool comments/ ID Location Served Manufacturer Nlodel Number Unit Type Type Voltage Amps Phases Cap. afic Features (Tons) (mo) WLl-S F Electric Office Goldstar GWl-D0000 WndcwAC R22 115 44/5 1 0.42 9.7 remWU9 Purchasing/ Office Electrdux FAK083J7V4 WndowAC R-22 115 7 1 0.67 10.5 Receitirg Water Unit can be rolled PAC-1 Services Office Sunpento✓.n�n WA-1210E Portable AC F�22 120 9 1 - - to naN location if Foreman needed 2.3.2.7 Domestic Hot Water Summary Domestic hot water is provided for the crew lounge by a 6 gallon electric hot water heater, detailed below. Page 15 Copyright© 2010 Enovity, Inc., All rights reserved. enovity , I Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Table 2.14: Warehouse Building Domestic Hot Water Heater Summary Design Equip. city Equip. IVl AO Type p Design Heating Full Load Water Water Storage Comments/ ID Location Location Number wpm(off Output (Kw) Effic.(%4 Storage Size (Gallons) Features O&M DM/V4 1 Building State P6610MSKO Electric Adjustable 1.44 100 Intemal 6 crew POOT Industries Resistance 2.3.3 System Set Points With the exception of the fan coils, boilers, and pumps, the system set points are all manual. The settings of the boilers and pumps are detailed in section 2.1. The fan coil as -found settings are given in the following table. Table 2.15: Fan Coil As -Found Settings =RRIA "', 01"M ® �0000 . operational schedule prograrnnned ®000000in chanADersoffice,.t accessible at the time in v�arehouse offices. Fan Coil [Disabled Page 16 Copyright © 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 3 HISTORIC ENERGY CONSUMPTION AND BENCHMARKING This section provides a snapshot of building energy consumption and a comparison of that consumption to California and national energy consumption benchmarks. 3.1 UTILITY BILL ANALYSIS Electricity is supplied to the TDPUD building by the Truckee Donner Public Utility Department (TDPUD). Natural gas is supplied by Southwest Gas Corporation. Table 3.1 provides a summary of annual energy consumption and cost based on the average of several years' data. The annual electric consumption and cost per conditioned square foot are 10.0 kWh and $1.22, respectively. The average electric cost is about $0.123 per kWh. The annual gas consumption is 0.597 therms per conditioned square foot, and the annual gas cost is $0.73 per conditioned square foot. Total energy cost is $1.96 per conditioned square foot. Figures 3.1 through 3.3 show the monthly electric consumption, monthly electric demand, monthly gas consumption, and the associated monthly cost for the year of 2008. Table 3.1: Utility Bill Data Summary Annual Electrical Consumption kWh 404,260 Annual Maxi mum Demand kW 81 Annual Electrical Cost $ $49,546 Cost/ Unit $/kWh $0.123 Annual Gas Consumption Therms 24,189 Annual Gas Cost (Propane) $ $29,780 Cost/ Unit (Propane) $✓Therm $1.707 Total Annual Energy Cost $ $79,326 Building Conditioned Floor Area sq. ft 40,550 Annual Electrical Consumption/ sq.ft kVMsq.ft 10.0 Annual Gas Consumption/ sq. ft Therms/sq.ft 0.597 Annual Energy Cost/sq.ft $/sq.ft 1.96 Page 17 Copyright © 2010 Enovity, Inc., All rights reserved. enovity , I 40,000 35,000 30,000 25,000 0 Q E 0 v 20,000 U N W 15,000 10,000 5,000 0 Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Figure 3.1: Monthly Electrical Energy Consumption o Electricity Consumption (kWh) t Electricity Usage Cost ($) E E d ¢ U > o LL O O N Z 0 $5,000 $4, 500 $4, 000 $3,500 $3,000 sV 0 U _T $2,500 z N W $2, 000 $1,500 $1,000 $500 $0 Page 18 Copyright© 2010 Enovity, Inc., All rights reserved. enovity , I 90 80 70 3 60 v c m E 0 50 m U w 40 E E m 30 20 10 0 Figure 3.2: Monthly Electrical Demand o Electrical Maximum Demand (kW) t Electricity Usage Cost ($) Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 U m L O N Z CO $5,000 $4,500 $4,000 $3, 500 $3,000 w 0 U $2,500 T u $2,000 w $1,500 $1,000 $500 $0 Page 19 Copyright© 2010 Enovity, Inc., All rights reserved. enovity 5,000 4,500 4,000 £ 3,500 `m s c 3,000 a E 'w 2,500 c 0 U d 2,000 a 0 a. 1,500 1,000 500 0 Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Figure 3.3: Monthly Gas Consumption (2008) oPropane Consumption (Therms) tPropane Cost ($) T d ' da ° l O O N Z ❑ The following observations are made from the review of the energy data. $7,000 $6,000 $5,000 w $4,000 c U d m a 0 $3,000 a` $2,000 $1,000 $0 • The building has a very constant electrical load. This is likely due to the lack of significant mechanical cooling equipment and the office equipment driven load. • The dips in electrical load are most likely due to employees taking vacation during July and January • The monthly propane usage (therms) in Figure 3.3 shows significantly higher consumption in the winter months than the summer months. This is due to higher heating hot water boiler and space heating usages in the cold months. • There is propane consumption during the summer months. As the boilers are shut down, this implies that the warehouse and/or garage heaters are operating during this period. The consumption in the June -September period is approximately 5% of the total annual propane consumption. • While the building has been transitioned from a Propane to a Natural Gas fuel, the annual therm consumption should remain constant 3.2 CAL ARCH BENCHMARKING Energy use intensity (EUI) benchmarks have been developed for the TDPUD building using the Cal Arch building reference tool. The Cal Arch program calculates the EUI and compares it to a population of buildings of Page 20 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 the same type in the same climate zone. These figures show the building's position on a histogram of comparison buildings from SCE, as described in the California End -Use Survey (CEUS) Database. CEUS is a comprehensive buildings characteristic survey sponsored by the California Energy Commission (CEC). In the past this survey was contracted out to the three major California electric utilities: Pacific Gas & Electric (PGE), Southern California Edison (SCE), and San Diego Gas & Electric (SDGE). The actual surveys were conducted through on -site interviews performed by companies contracted to the utilities. The energy usage intensity for the whole building electricity is charted in detail in the following figure. P Figure 3.4: Electrical Energy Usage Intensity E Electricity Use Intensity ( Whrisgft—yr) 00 so 60 �a 20 0 The TDPUD building's electrical EUI is 10 kWh/ft2-yr, which is higher than 30% of comparison buildings shown. This benchmarking database does not allow for multiple space types within one building. As a result, the TDPUD is being benchmarked against office buildings of the same size with all of their square footage being conditioned by mechanical systems. Note that high energy usage intensity does not necessarily mean an inefficient building, and vice versa. There are many factors that affect a building energy usage that are not included in this benchmarking tool, such as occupancy patterns, ventilation requirements, process loads, building envelope, usage type, etc. This tool simply provides a direct comparison to actual data from real buildings in California. There is no Cal Arch comparison data available for the Propane/Natural Gas energy consumption. 3.3 ENERGY STAR BENCHMARKING This building was benchmarked using the Energy Star Benchmarking tool. This tool compares energy consumption for this building with comparable buildings across the nation. The Energy Star summary sheet is given in the following figure. The full Energy Star statement of energy performance is included in Appendix A. Page 21 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 Figure 3.5: Energy Star Statement of Energy Performance 2949 Truckee Donner Public Utility district 11570 Danner Pass Rd Truckee, CA 96161 Portfolio Manager Building 10; 1944627 The energy use of this building has been measured and compared to other similar buildings using the Environmental Protection Agency's (EPA's) Energy Performance Scale of 1-100, with 1 being the least energy efficient and 100 the most energy efficient. For more information, visit anargystar.govlbenchmark. This building's VGo re 14 1 $d I IIII 7 This building uses 174 Mu per square foot par year. Build+ngs with a %core at •eased on saume energy Intensity for the 12 month penod enOrig May 2009 75 pr higher may qualify fir EPA's ENERGY STAR. carlNy Ihat the mfo"allun cohlowed Wlthln WWa slatemehl Ig acwrgte and In amorclanm Wlth U.6. pale of card Flcation Emmmmenlal Proledion Agency s maasumment slanaards. lou nd at energyma r.go4 Date Generated: 12/07/2009 Page 22 Copyright © 2010 Enovity, Inc., All rights reserved. * Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 4 ENERGY USE ANALYSIS/DEFICIENCY LOG 4.1 BUILDING ENVELOPE The building envelope is built according to the standards at the time and has no notable deficiencies. There is an opportunity to save energy by insulating the garage doors of the O&M building, as detailed in section 5.2. While the windows themselves are double paned, the window sealing presents an opportunity for energy savings. While the savings opportunities for gap sealing in residential buildings ranges up to 25%, the savings for commercial buildings vary greatly by design, prevailing winds, and weather patterns. Occupants have reported gaps in the window seals large enough to allow sand to enter the building. The window air conditioning units that have been installed for personal comfort utilize bellows type seals that block off the portion of the window that is not taken up by the air conditioning unit. The seals between many of the window air conditioning units and the window frames were found to have significant gaps. An example of these gaps is given in the following figure. Figure 4.1: Gaps between Window AC Units and Frame 4.2 HVAC SYSTEMS The HVAC system has several issues relating to energy efficiency and to building operation. The portion of the HVAC system which has the greatest potential for improved energy efficiency is the boiler system. This increased energy efficiency can be realized through valving off unused equipment, installation of a Page 23 Copyright © 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 stack damper, and adjustment of boiler mixture through fine tuning the gas pressure. Additional electrical savings are possible through scheduling pump operation but the additional control integration required may make this option less attractive. The implementation of VFD speed control for the HHW pumps was evaluated and found to have a simple payback in excess of 20 years. More detail on the recommended measures is provided in section 5.2. The HVAC systems in the administration building use a much smaller amount of electrical energy than those in most buildings its size, thanks to the lack of mechanical cooling. Unfortunately, this energy efficiency comes at the cost of some occupant comfort. It would appear that it has been some time since the dampers that control the outside air flow to the fan coils have been operational, preventing the use of what limited cooling capability exists. The operations and maintenance building has only the window unit HVAC systems detailed above to provide mechanical cooling. In addition to the energy efficiency opportunities present in the boiler system, there are opportunities for increasing occupant comfort by improving fan coil operation. The two major issues having detrimental effects on occupant comfort are an excess of heating operation and a deficiency in outside air. The excess heating is due to leaking zone valves that are heating the space at times where there is no demand for heating. The lack of sufficient outside air is caused both by the failed damper actuators and by the way that the fan coils are being controlled. The building depends on the fan coils constant operation to bring enough outside air to meet code requirements. For this reason, the original design called for the fans to be operated via time clock. This time clock operation would assure that the space received adequate outside air regardless of space temperature. When the decision was made to have the fans controlled by thermostat, no allowance was made to assure that sufficient outside air is introduced to the space during occupied hours. If a thermostat has its fan selector switch set to "auto" instead of "on", the fan will shut off once an acceptable space temperature is attained. The amount of minimum outside air was set by the balancer by adjusting the return damper linkage stop position. This system is supposed to function with the dampers partially closed to draw a mixture of outside air and return air when the system temperature is satisfactory or the space is requiring heat. Once the system requires cooling, the actuator should close the return damper entirely, forcing the unit to utilize outside air exclusively. At present, the actuators are not functioning and the dampers are disconnected in many cases. This results in an arbitrary amount of outside air being introduced to a space, depending only on the uncontrolled position of the return damper. If the damper happens to be fully closed, the unit takes on too much outside air during the heating season and increases the heating load. If the damper is not closed, it is likely that the space is not getting enough outside air, given the insufficient exhaust fan capacity. 4.3 DUCT SYSTEMS The ducts in the administration building appear to be in good working order. The supply air distribution is primarily accomplished via slot diffusers, return is via the plenums. Outside air is ducted from a dual intakes on the east and west ends of the north facing wall of the roof above the warehouse. Exhaust ducts are routed to a single grille in between the outside air grilles. While the ducts in the plenums are not insulated, the plenums themselves are, as shown in Figure 2.1. Distribution duct runs from the fan coils are generally short, and the outside air ducts are sufficiently sized to allow enough outside air to balance the fan coil units, despite the long Page 24 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 distance that it has to traverse. While not specifically a deficiency of the duct system, the building design calls for 2,725 CFM of outside air, but only 2,000 CFM of exhaust. This lack of forced exhaust air flow leads building occupants to leave the doors between the administration building and the breezeway open to allow sufficient circulation. The manner in which the outside air is introduced into the building is not functioning, as detailed in section 4.2. The ducting on the O&M building main exhaust fans appears to be in good working order. The dampers which provide natural ventilation to the warehouse space are in need of adjustment and repair. 4.4 LIGHTING Lighting in the Administration building has been updated to modern linear T8 or compact florescent lamps. The use of wall mounted occupancy sensors has been implemented for some of the smaller office space. While the layout and wiring of the open office lighting circuits does not lend itself to cost effective use of occupancy sensor control, trend data indicates that TDPUD personnel consistently turns the lights off at the end of occupancy. Examples of this trend data are shown in Appendix B. The board room features multi -scene control, utilizing recessed linear florescent uplighting, recessed florescent troffers, and pin type compact florescent U tubes, and the room. Lighting in the O&M building has also been updated to T8 lamps in the warehouse and associated office areas and to T5 high bay fixtures in the garage areas. The use of occupancy sensors to control lighting in the O&M building has been limited to the crew lounge. 4.5 HEATING HOT WATER SYSTEM A recent flue gas analysis indicates that there is an excessive amount of air being induced into the combustion mixture. The mixture on this type of equipment is controlled by a combination of fuel orifice size and fuel pressure. The orifice has been replaced recently as a part of the boiler fuel conversion, but it does not appear that the fuel pressure has been optimized for efficient boiler operation. In addition to the combustion issues shown in the following figure, there are a number of energy efficiency opportunities that result from the operation of a redundant boiler. Page 25 Copyright© 2010 Enovity, Inc., All rights reserved. enovity , I Figure 4.2: Boiler 1 Flue Gas Analysis BACHARACH, 1HC. PCA 2 SH: PQ1083 Time: 01:17:39 PH - Date: 11/24/09 Pie I KOAS 1 o= 10.1 78.1 r- r . �Y] Pt �i�J pp■ Ix1, 5 tin■ Nlla CMI Vp■ VV, 4 ppl6 HO UU SM pp■ 1 rx1 "to 9[h (2) ::, "tom Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 This sort of boiler should be capable of 80% efficiency Ideally, the excess air for natural gas is in the range of 2-7% Page 26 Copyright© 2010 Enovity, Inc., All rights reserved. * Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 5 ENERGY CONSERVATION MEASURES 5.1 METHODOLOGY Energy Efficiency Measures (EEMs) were evaluated using spreadsheet analysis for electrical consumption (kWh), peak -period demand (kW) savings and gas (therms) savings. Capital cost estimates include the following: material, labor, design where applicable, construction/project management where applicable, commissioning where applicable, and contractor profit and overhead. The capital cost estimates are based on information from suppliers and contractors, experience with similar projects and published sources including IRS Means. Measures were evaluated based on savings potential and simple payback. Those measures with a simple payback of less than 6 years were recommended for implementation. 5.2 SUMMARY OF RECOMMENDED ENERGY EFFICIENCY MEASURES EEM 1: Disable HHW flow to Boiler #2 when not in operation At present, both boilers have HHW flowing continuously through their combustion chamber and out the exhaust stack for the entirety of the heating season. Staff interviews verified that boiler 2 is operated on a very infrequent basis. Field measurements verified that air temperature of the air going up the stack is approximately 150 degrees on a day in which the outside air temperature was near freezing. This temperature rise represents thermal energy that is being removed from the HHW loop that is not going to heat the building and is thus being wasted. The changes that would be introduced by this EEM are to close the boiler 2 supply and return valves, as well as installing a blanking plate to avoid continued air flow over the boiler tubes. This air flow must be avoided due to the risk of freezing the boiler tubes while the boiler is not is operation. In addition to the natural gas savings, these changes would eliminate the work that the HHW pump is now using to push water through boiler tubes that are not helping to heat the building. Field testing confirmed that disabling this flow resulted in a reduction in pumping energy of 3.3%. This reduction is graphed in Appendix B. The total estimated annual electricity savings are 200 kWh/yr. The total estimated annual natural gas savings are estimated to be 1,200 therms/yr. The total annual energy cost savings are estimated to be $700/yr. Implementation cost is estimated to be $200, giving a simple payback of less than one year. EEM 2: Install an automatic stack damper on Boiler #1 The stack on Boiler #1 has the same sort of losses as the stack on Boiler #2 but cannot be shut down in the same way, as it is the heat source for the building. In order to reduce the energy loss from air flow through this stack, it is proposed that an automated stack damper be installed. An automated stack damper is a device that allows flue gases to escape the stack when combustion is taking place, but blocks off the stack when the boiler is not firing. Trend data taken from Boiler #1 indicates that the duty cycle of Boiler is approximately 28%, leading to a large potential for savings when the boiler is not firing. The boiler duty cycle is shown in Appendix B. There are no estimated annual electricity savings. The total estimated annual natural gas savings are estimated to be 800 therms/yr. The total annual energy cost savings are estimated to be $500/yr. Implementation cost is estimated to be $1,500, giving a simple payback of 3.0 years. Page 27 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 EEM 3: Adjust Boiler gas pressure regulator to obtain peak combustion efficiency Flue gas analysis indicates that the boiler is operating with a greater amount of excess air than is ideal. This excess air increases energy consumption by heating air that is not necessary for combustion and can be a factor in excessive NOx emissions. The boiler duty cycle was used in conjunction with the boiler rated capacity and duration of the heating season to determine savings due to the adoption of this measure. There are no estimated annual electricity savings. The total estimated annual natural gas savings are estimated to be 300 therms/yr. The total annual energy cost savings are estimated to be $200/yr. Implementation cost is estimated to be $1,060, giving a simple payback of 5.3 years. EEM 4: Insulate the metal roll up doors in the building garages There is a significant amount of garage door surface area in the heated garage spaces. These doors are not insulated, and are not very effective in keeping heat from escaping the garage spaces. This measure consists of adhering 2 inch thick expanded polystyrene rigid insulation on to the internal surface of the garage doors. There are no estimated annual electricity savings. The total estimated annual natural gas savings are estimated to be 600 therms/yr. The total annual energy cost savings are estimated to be $400/yr. Implementation cost is estimated to be $1,800, giving a simple payback of 4.6 years. EEM 5: Reorient Warehouse lighting and install occupancy sensor light control The fixtures in the warehouse space are mounted according to the original design, in rows that are diagonal with respect to the building walls. The warehouse inventory racking system, however, is oriented parallel to the building walls. This mismatch in orientation causes a significant amount of light to be wasted by lighting the tops of the inventory racks rather than the space in use. This measure consists of reorienting the fixtures, and rewiring them to incorporate occupancy sensors. Reorienting the lamps allows them to be circuited in a way that permits occupancy sensor based lighting control. The total estimated electricity savings are 4,000 kWh/Yr. There are no estimated annual natural gas savings. The total annual energy cost savings are estimated to be $500/yr. Implementation cost is estimated to be $2,300, giving a simple payback of 4.7 years. EEM 6: Install occupancy sensor light control on the garage high bay fixtures The garage high bay fixtures were recently upgraded to a high efficiency T5 design. They are generally left on despite the garage's sparse occupancy. This measure consists of incorporating a line level occupancy sensor in series with each fixture The total estimated electricity savings are 3,100 kWh/Yr. There are no estimated annual natural gas savings. The total annual energy cost savings are estimated to be $400/yr. Implementation cost is estimated to be $2,100, giving a simple payback of 5.4 years. EEM 7: Install occupancy sensor light control in O&M building office spaces The O&M building has several offices that are controlled by manual switch. This measure consists of implementing occupancy sensors to control these lights. As these offices have high partitions, the occupancy sensor will be an overhead ceiling mounted sensor. Page 28 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 The total estimated electricity savings are 1,700 kWh/Yr. There are no estimated annual natural gas savings. The total annual energy cost savings are estimated to be $200/yr. Implementation cost is estimated to be $1,750, giving a simple payback of 8.2 years. EEM 8: Install occupancy sensor light control in appropriate Administration Building spaces. There are opportunities for energy savings by installing occupancy sensor light control in the Conservation office, Board room, and Kitchen. This measure consists of installing wall and ceiling mounted occupancy sensors, as appropriate. The total estimated electricity savings are 1,600 kWh/Yr. There are no estimated annual natural gas savings. The total annual energy cost savings are estimated to be $200/yr. Implementation cost is estimated to be $900, giving a simple payback of 4.6 years. EEM 9: Use programmable thermostats to control the operation of the IR heaters in the Garage The garage heaters are now operating constantly to maintain a 50 F setpoint during the heating season. This setpoint is maintained whether the building is occupied or not. This measure consists of installing sufficient programmable thermostats to control the heaters with a schedule. This calculation assumes that the occupied hour heating setpoint corresponds to 50 degrees and the setback setpoint is 40 degrees. There are no estimated annual electricity savings. The total estimated annual natural gas savings are estimated to be 1,600 therms/yr. The total annual energy cost savings are estimated to be $1,000/yr. Implementation cost is estimated to be $2,800, giving a simple payback of 2.8 years. EEM 10: Use programmable thermostats to control the operation of the unit heaters in the Warehouse The warehouse is heated by four unit heaters, each with a corresponding analog thermostat. This measure consists of installing four programmable thermostats that automate the transition from occupied to unoccupied periods. This calculation assumes that the thermostats are accidentally left on 3 times per month. This calculation also assumes that the temperature setpoint is reduced from 70 to 65 degrees. There are no estimated annual electricity savings. The total estimated annual natural gas savings are estimated to be 3,000 therms/yr. The total annual energy cost savings are estimated to be $1,900/yr. Implementation cost is estimated to be $1,100, giving a simple payback of 0.6 years. EEM 11: Install Circulation fans to reduce temperature stratification within the warehouse during the heating season The warehouse is heated by four unit heaters located well above the level that requires heating. The large room volume and high location of the heaters results in a very stratified temperature distribution. This measure consists of installing four fans in the room corners at the heater level that are pointed toward the warehouse floor. This will result in a more even temperature distribution allowing heat that is input to the space to reach the thermostat and turn off the heater once the load has been satisfied. There are no estimated annual electricity savings. The total estimated annual natural gas savings are estimated to be 2,400 therms/yr. The total annual energy cost savings are estimated to be $1,500/yr. Implementation cost is estimated to be $2,100, giving a simple payback of 1.4 years. Page 29 Copyright© 2010 Enovity, Inc., All rights reserved. * Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 5.3 CAPITAL MEASURES RELATED TO ENERGY EFFICIENCY The following capital measures were evaluated and found to have a high cost of implementation. Capital Measure 1: Boiler Replacement with Condensing Boiler Given the low combustion efficiency of the existing boiler and cold temperatures of the heating season, the replacement of one of the existing boilers with a condensing boiler was evaluated. While the higher combustion efficiency would result in reduced fuel usage, the cost of retrofitting the facility to be able handle the condensate makes the payback unattractive. Operational issues for this measure include assuring that the fan coil heating capacity would be sufficient with the lower water temperatures and making sure that the second boiler will not come on line until the HHW return temperature is high enough to prevent condensation on its tubes. The estimated cost of this measure is $ 55,000, and the annual saving is approximately $3,574. Capital Measure 2: Control System Retrofit The installation of a direct digital control (DDC) system was evaluated as a means to accomplish energy efficiency measures and enable trending of building conditions. It was determined that the primary benefits to installing a DDC system would come from increased occupant comfort and trending capability. Much of the occupant comfort benefit can be realized by repairing existing systems and implementing the measures detailed in the occupant comfort measures section below. The estimated cost of implementing a DDC system for this facility is $204,000. This estimate is for the installation of an open protocol DDC control system, required equipment controllers sufficient to control all system points, and an operator workstation. The points that are covered under this measure are detailed in Appendix C Page 30 Copyright© 2010 Enovity, Inc., All rights reserved. * Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 6 OPERATIONAL MEASURES 6.1 OPERATIONS AND MAINTENANCE MEASURES O&M 1: Rebuild the seats in the Taco zone valves to prevent HHW leakage through coil when heating is not being called for. Site testing revealed that several of the Taco zone valves are allowing HHW to flow through the coils after the call for heating is removed. Shutting of fluid flow with the manual shutoff valve yielded discharge air temperatures that were 3 degrees cooler than the air temperature with only the Taco shut off, on average. This excessive heating is a contributing factor to the elevated temperatures on the second floor. O&M 2: Assure that the Fan Coil Units' Fans Remain on During Occupied Hours The original design documents specified that a time clock controller be used to enable and disable the fan coil fans. This would ensure that the fans remained on for the entire occupied period. At present, the fans come on only if the space temperature is out of the thermostat setpoint range. As a result, any zone whose thermostat is set to Auto will not be receiving sufficient outside air to meet Title 24 requirements. This measure consists of making sure that the fan coil unit fans do not get turned off while the building is occupied. The fans' continuous operation is critical to assuring that the building takes in sufficient outside air. This measure can be accomplished either by having the person designated by O&M 3 turn the fans on and off at the beginning and end of each day or by replacing the original Honeywell thermostats with a modern 7 day programmable thermostat that has fan control as an option for each programmed period O&M 3: Designate One Person to Maintain Thermostat Settings, Install Lockable Covers The building thermostats are currently set to a variety of temperatures and schedules, with some thermostats updated for daylight savings time and some not updated. This measure calls for one person (with an alternate in the case of illness or absence) to be responsible for thermostat settings. This person would be responsible for making sure that the settings for all the thermostats are consistent and that they are properly programmed with respect to daylight savings time and building occupancy. In order to assure that the fans remain on during the occupied period and to assure consistent operation, it is recommended that the responsibility for the thermostats be delegated to one person. It is also recommended that the thermostats be fitted with locking covers to assure the persistence of intended settings. O&M 4: Repair Fan Coil 10 (Locker Rooms) Fan coil ten makes a buzzing sound when turned on, but does not function. Facility notes indicate that unit has not functioned for some time. It is recommended that this unit be repaired. O&M 5: Repair Fan Coil 13 (Warehouse Offices) Fan coil thirteen does not respond to thermostat commands to operate. The repair may be as simple as turning the breaker/disconnect back on. O&M 6: Repair or Decommission Electronic Boiler Controls There is a time clock and a temperature controller installed for boiler control. Neither of these systems is controlling the boiler at present. It is recommended that these systems either be integrated into boiler controls or decommissioned. Page 31 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 O&M 7: Repair Warehouse Ventilation Dampers The ventilation dampers that allow hot air to exhaust the warehouse in the summer are not all functional. One damper does not actuate, the others have slight binding on their stroke. It is recommended that the dampers be restored to full function. O&M 8: Install Programmable Timers on Warehouse and Garage Heating Equipment This measure consists of installing programmable timers to control the heating equipment that doesn't already have a twist timer associated with it. This will have different benefits for the warehouse and garage spaces. In the warehouse, this will assure that the space is at a comfortable temperature on Monday mornings and free up personnel that would otherwise have to adjust the thermostat twice a day. In the garage spaces, this would allow for night setback and reduce heat loss during the unoccupied period without any risk of freezing. O&M 9 Re -Enable CO Sensor Control of Exhaust Fans This measure consists of investigating and repairing the exhaust fans that prevent potentially fatal Carbon Monoxide (CO) concentrations in the garage spaces due to vehicle exhaust. This may also entail the reduction of the exhaust fan speed in order to prevent an excessive loss of heat once the fans are enabled. 6.2 OCCUPANT COMFORT MEASURES The following measures were evaluated for their potential to increase occupant comfort. They will not necessarily result in any energy savings, and may increase energy consumption. It should be noted that OCM 3 and OCM 4 are mutually exclusive; one or the other can be implemented but it would be inadvisable to implement both. Occupant Comfort Measure 1: Fan Installation to Assure Adequate OA As detailed in section 4.2, the Administration building's Exhaust Air capacity is not equal to its Outside Air demands. In addition to the mismatch in capacity, all of the building exhaust fans are located in the restrooms behind doors that lack ventilation grates that would allow airflow from the occupied space when the door are closed. The installation of ventilation grates would be an improvement, but is insufficient to assure adequate OA on its own. These restroom fans are not scheduled and only operate when someone turns on the restroom lights. This dependence on manual switching, combined with the trend of installing occupancy sensor lighting, make the restroom fans a poor option to assure that the building has adequate exhaust air flow. This measure calls for the installation of fan(s) to assure that sufficient OA is being circulated through the building. This can be accomplished by the installation of a duct fan electronically controlled to assure a steady duct static pressure and the installation of exhaust fans located in the return plenums. This measure would require that the building be rebalanced and would benefit greatly from the implementation of OCM 2. Occupant Comfort Measure 2: Repair Actuators Controlling the Return Air Dampers and Rebalance Building with All Doors Closed In order to be able to ensure that the occupied spaces are capable of getting sufficient outside air, the building should be rebalanced in the condition that it is intended to be operated in. This entails having all outside doors and restroom/locker room doors shut, with the bathroom fans on. In order to keep the building balanced, the Page 32 Copyright© 2010 Enovity, Inc., All rights reserved. enovity Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 return air dampers must be capable of maintaining a fixed or repeatable position. While the dampers could be physically locked into their minimum OA flow position, doing this would eliminate any cooling capacity. At present, there is a high failure rate of the existing actuators. It is Enovity's recommendation that the actuators sizing be evaluated, and appropriately sized actuators be installed to control the return air dampers. Occupant Comfort Measure 3: Installation of a Direct Evaporative Cooler as the Second Stage of Cooling for Ducted Systems The current system configuration is to use outside air as the source of cooling for the Administration building, as well as the fan coil unit serving the warehouse offices. While this cooling may be sufficient for cooling needs on milder days, it does not adequately address cooling needs on warmer days. This measure consists of implementing a direct evaporative cooling section at the outside air grille on the roof. This evaporative cooler would feature a face/bypass arrangement to avoid introducing scale into the ductwork when the cooling is not called for, automatic draining in low temperatures, and a small fan to ensure that the duct pressure is positive at all times. In order to avoid stagnant, humid air in the occupied spaces, the exhaust capabilities of the administration would have to be upgraded to equal the amount of air being introduced by the evaporative section. Occupant Comfort Measure 4: Install Mechanical Cooling in Administration Building Fan Coils This measure consists of installing evaporator coils in the administration building fan coil units with remote condenser/compressor unit(s). The most likely location for the condenser/compressor units would be on the warehouse mezzanine level. This location would have the advantage of being sheltered from the elements, but would result in elevated warehouse temperatures in the cooling season. Whether the mechanical cooling is utilized as the first or second stage of cooling would depend on the implementation of OCM2. It is recommended that the building be given adequate outside air and balanced in addition to any cooling equipment installed. Occupant Comfort Measure 5: Install an Evaporative Cooler on the Warehouse Ventilation Dampers The warehouse space has not conditioning for the cooling system, and is burdened with the heat coming off of the computer room and board room condensing units. This measure would consist of installing a window unit evaporative cooler of the sort used as a residential window unit to cool the air coming into the warehouse. As there is an existing thermostat controlling the operation of these dampers, it would be a simple matter to add a delay -on -make relay to control the evaporative cooler. 6.3 SUMMARY OF ISSUES In the course of the audit process, several issues were discovered that merit further attention or action. These issues have been discussed in the appropriate sections of this report and are summarized in the following table. Page 33 Copyright© 2010 Enovity, Inc., All rights reserved. enovity , I Table 6.1: Summary of Issues Truckee Donner Public Utility District 11570 Donner Pass Road January 15, 2010 S. No. Issue System Recommendation 1 There is no preventative maintenance program in place Whole Facility Institute a preventative maintenance program, provide personnel enough hours to plan and execute program 2 There is unneeded water flow through the inactive boiler Boiler EEM 1 leading to heat loss 3 Active boiler has uncontrolled air flow while burners are not Boiler EEM 2 firin , leading to heat loss 4 Boiler has measured thermal efficiency 4% below rated Boiler EEM 3 efficiency Boiler operates on a very short firing cycle - This can lead to EEM1, EEM2, Widen the range of temperature setpoints at 5 boiler tube corrosion and premature failure Boiler which the boiler starts/stops firing Investigate and repair, use Johnson Control to prevent HHW 6 Boiler time clock controller is not operating boiler Boiler loop from low temperatures during unoccupied period, part of O&M 7 7 Johnson temperature staging controller is not operating boiler Boiler Investigate and repair, part of O&M 7 8 There are significant gaps between the window AC units and Building Shell Seal with foam and/or caulk. Preventing infiltration can lead to the window frames savings of up to 15 /o of heating and cooling energy. 9 The metal roll up doors in the garages are a source of heat Building Shell EEM 4 loss 10 The warehouse lighting is not aligned with the racking system, Warehouse EEM 5 preventing efficient use of light 11 The warehouse lighting is on continuously during occupied Warehouse EEM 5 hours despite sparse occupancy HHW reset valve does not respond to loop temperature Decommission the reset or install an outside air sensor to 12 fluctuations HHW Loop control it according to the schedule on the design documents, art of O&M 7 13 The garage bay lights are on all day despite sparse Garage Lighting EEM 6 occupancy 14 The O&M office lights are on all day despite intermittent Warehouse EEM 7 occupancy Office 15 There are lights in the Administration that could benefit from Administration EEM 8 ,occupancy sensor control Building 16 Outside air ventilation is provided only when the fan coils are Office Fan O&M 3 operating in cooling mode Coils The bathroom fans are on a switch with lights, not on Use a wall switch timer to schedule lights/fan. If occupancy 17 continuously during occupied hours. The lights and fan Exhaust Fans sensors are used to control bathroom lights, put exhaust fans operation are controlled via an occupancy sensor in the on their own circuit with wall switch timer, part of O&M 2 ,upstairs and bathrooms. Building cannot meet code OA with doors closed - The Adminstration 18 (bathroom) exhaust fan capacity is 2000 CFM while the Building OCM 1 required OA is 2725 19 Administration building has insufficient OA Administration OCM1, OCM 2, O&M 2 Building 20 Restroom doors don't have grilles to allow air and odors to be Administration Install grilles to allow odors to escape building exhausted from the restrooms Buildin The warehouse has a great deal of stratication in air 21 temperature Warehouse EEM 11 22 Warehouse office fan coil diffusers are covered with Warehouse O&M 1, O&M 3, O&M 6 cardboard blanking plates Office 23 Warehouse office fan coil is not operational Warehouse O&M 1, O&M 3, O&M 6 Office 24 Administration Building office spaces are too warm throughout Adminstration O&M 1, OCM 1, OCM 2, OCM 3 or 4 the entire year Building 25 Thermostat settings vary throughout building Administration O&M 3 Building 26 Fan Coil 10 is not functional Adminstration O&M 5 Building 27 One of the warehouse ventilation dampers is not operating Warehouse O&M 7 free) 28 There is gas consumption during summer months despite total Entire Facility EEM 9 boiler shutdown 29 CO Sensors have been disabled in the Garages Exhaust Fans O&M 9 30 The warehouse heaters are set to 70 degrees F, despite it Warehouse EEM 10, EEM 11 being an uninsulated building. Page 34 Copyright © 2010 Enovity, Inc., All rights reserved. APPENDIX A: Energy Star Performance Report OMB No. 2060-0347 STATEMENT OF ENERGY PERFORMANCE Truckee Donner Public Utility District Building ID: 1944627 For 12-month Period Ending: May 31, 20091 Date SEP becomes ineligible: N/A Facility Truckee Donner Public Utility District 11570 Donner Pass Rd Truckee, CA 96161 Year Built: 1986 Gross Floor Area (ft2): 40,550 Energy Performance Rating2 (1-100) 14 Site Energy Use Summary3 Electricity - Grid Purchase(kBtu) Liquid Propane (kBtu) Natural Gas - (kBtu)4 Total Energy (kBtu) Energy Intensity5 Site (kBtu/ft2/yr) Source (kBtu/ft2/yr) Emissions (based on site energy use) Greenhouse Gas Emissions (MtCOZe/year) Electric Distribution Utility Truckee Donner P U D Facility Owner Truckee Donner Public Utility District 11570 Donner Pass Rd Truckee, CA 96161 National Average Comparison National Average Site EUI National Average Source EUI % Difference from National Average Source EUI Building Type 1,442,867 2,228,998 0 3,671,865 Meets Industry Standards6 for Indoor Environmental Conditions: Ventilation for Acceptable Indoor Air Quality N/A Acceptable Thermal Environmental Conditions N/A Adequate Illumination N/A 91 174 316 57 109 60% Office Date SEP Generated: December 07, 2009 Primary Contact for this Facility Steven Poncelet 11570 Donner Pass Rd Truckee, CA 96161 Stamp of Certifying Professional Based on the conditions observed at the time of my visit to this building, I certify that L the information contained within this statement is accurate. Certifying Professional Justin Regnier 11290 Point East Drive, Suite 215 Rancho Cordova, CA 95742 Notes: 1. Application for the ENERGY STAR must be submitted to EPA within 4 months of the Period Ending date. Award of the ENERGY STAR is not final until approval is received from EPA. 2. The EPA Energy Performance Rating is based on total source energy. A rating of 75 is the minimum to be eligible for the ENERGY STAR. 3. Values represent energy consumption, annualized to a 12-month period. 4. Natural Gas values in units of volume (e.g. cubic feet) are converted to kBtu with adjustments made for elevation based on Facility zip code. 5. Values represent energy intensity, annualized to a 12-month period. 6. Based on Meeting ASHRAE Standard 62 for ventilation for acceptable indoor air quality, ASHRAE Standard 55 for thermal comfort, and IESNA Lighting Handbook for lighting quality. The government estimates the average time needed to fill out this form is 6 hours (includes the time for entering energy data, PE facility inspection, and notarizing the SEP) and welcomes suggestions for reducing this level of effort. Send comments (referencing OMB control number) to the Director, Collection Strategies Division, U.S., EPA (2822T), 1200 Pennsylvania Ave., NW, Washington, D.C. 20460. EPA Form 5900-16 ENERGY STAR® Data Checklist for Commercial Buildings In order for a building to qualify for the ENERGY STAR, a Professional Engineer (PE) must validate the accuracy of the data underlying the building's energy performance rating. This checklist is designed to provide an at -a -glance summary of a property's physical and operating characteristics, as well as its total energy consumption, to assist the PE in double-checking the information that the building owner or operator has entered into Portfolio Manager. Please complete and sign this checklist and include it with the stamped, signed Statement of Energy Performance. NOTE: You must check each box to indicate that each value is correct, OR include a note. CRITERION VALUE AS ENTERED IN VERIFICATION QUESTIONS NOTES PORTFOLIO MANAGER Truckee Donner Public Is this the official building name to be displayed in Building Name Utility District the ENERGY STAR Registry of Labeled ❑ Buildings? Office Is this an accurate description of the space in ❑ Type question? 11570 Donner Pass Rd, Is this address accurate and complete? Correct Location Truckee, CA 96161 weather normalization requires an accurate zip code. Does this SEP represent a single structure? SEPs cannot be submitted for multiple -building Single Structure Single Facility campuses (with the exception of acute care or children's hospitals) nor can they be submitted as representing only a portion of a building Administration Building (Office) CRITERION VALUE AS ENTERED IN VERIFICATION QUESTIONS NOTES PORTFOLIO MANAGER Does this square footage include all supporting functions such as kitchens and break rooms used by staff, storage areas, administrative areas, elevators, stairwells, atria, vent shafts, etc. Also Gross Floor Area 21,500 Sq. Ft. note that existing atriums should only include the ❑ base floor area that it occupies. Interstitial (plenum) space between floors should not be included in the total. Finally gross floor area is not the same as leasable space. Leasable space is a subset of gross floor area. Is this the total number of hours per week that the Office space is 75% occupied? This number should exclude hours when the facility is occupied Weekly operating 45 Hours only by maintenance, security, or other support ❑ hours personnel. For facilities with a schedule that varies during the year, "operating hours/week" refers to the total weekly hours for the schedule most often followed. Is this the number of employees present during the main shift? Note this is not the total number of employees or visitors who are in a building during Workers on Main an entire 24 hour period. For example, if there are Shift 40 two daily 8 hour shifts of 100 workers each, the Workers on Main Shift value is 100. The normal worker density ranges between 0.3 and 10 workers per 1000 square feet (92.8 square meters) Number of PCs 50 Is this the number of personal computers in the ❑ Office? Is this the percentage of the total floor space within Percent Cooled Less than 50% the facility that is served by mechanical cooling ❑ equipment? Is this the percentage of the total floor space within Percent Heated 50% or more the facility that is served by mechanical heating equipment? Garages nnO RA I ..;'a;^g (VIAM&ouse CRITERION VALUE AS ENTERED IN VERIFICATION QUESTIONS NOTES PORTFOLIO MANAGER Page 1 of 5 Is this the total gross floor area as measured between the principal exterior surfaces of the enclosing fixed walls and including all supporting functions? The total gross floor area should include offices, lobbies, rest rooms, equipment storage areas, mechanical rooms, employee break Gross Floor Area 8,700 Sq. Ft. rooms, cafeterias, elevators, stairwells, all space ❑ occupied by refrigeration/freezer units, and all areas that are entirely refrigerated. Existing atriums or areas with high ceilings should only include the base floor area that they occupy. The total gross floor area should not include outside loading bays or docks. Does this number represent the average number of workers that are present during the primary shift Workers on Main (that is, the shift with the most workers)? Note: this Shift 2 is not the total number of staff employed at the ❑ property. For example, if there are three daily 8 hour shifts of 100 workers each, the Workers on Main Shift value is 100. Is this the total number of hours per week that this warehouse space is in operation, excluding hours Weekly operating 45 Hours when the facility is occupied by maintenance, El security, or other support personnel? Note: the average warehouse space operates 60 hours per week. Is this the percentage of the total floor space within Percent Cooled 0 % the facility that is served by mechanical cooling ❑ equipment? Is this the percentage of the total floor space within Percent Heated 100 % the facility that is served by mechanical heating ❑ equipment? Number of walk-in Does this count include all large walk-in refrigeration/freezer 0 refrigeration or freezer units at the warehouse? ❑ units Distribution Center F No (Optional) Is this building considered a distribution center? ❑ Warehouse, O&M Building (Warehouse (Unrefrigerated)) CRITERION VALUE AS ENTERED IN VERIFICATION QUESTIONS NOTES PORTFOLIO MANAGER Is this the total gross floor area as measured between the principal exterior surfaces of the enclosing fixed walls and including all supporting functions? The total gross floor area should include offices, lobbies, rest rooms, equipment storage areas, mechanical rooms, employee break Gross Floor Area 10,350 Sq. Ft. rooms, cafeterias, elevators, stairwells, all space ❑ occupied by refrigeration/freezer units, and all areas that are entirely refrigerated. Existing atriums or areas with high ceilings should only include the base floor area that they occupy. The total gross floor area should not include outside loading bays or docks. Does this number represent the average number of workers that are present during the primary shift Workers on Main (that is, the shift with the most workers)? Note: this Shift 6 is not the total number of staff employed at the ❑ property. For example, if there are three daily 8 hour shifts of 100 workers each, the Workers on Main Shift value is 100. Is this the total number of hours per week that this warehouse space is in operation, excluding hours Weekly operating 45 Hours when the facility is occupied by maintenance, ❑ hours security, or other support personnel? Note: the average warehouse space operates 60 hours per week. Is this the percentage of the total floor space within Percent Cooled 10 % the facility that is served by mechanical cooling ❑ equipment? Is this the percentage of the total floor space within Percent Heated 100 % the facility that is served by mechanical heating ❑ equipment? Number of walk-in Does this count include all large walk-in refrigeration/freezer 0 refrigeration or freezer units at the warehouse? ❑ units Distribution Center Yes (Optional) Is this building considered a distribution center? ❑ Page 2 of 5 Page 3 of 5 ENERGY STAR® Data Checklist for Commercial Buildings Energy Consumption Power Generation Plant or Distribution Utility: Truckee Donner P U D Fuel Type: Electricity Meter: Electricity (kWh (thousand Watt-hours)) Space(s): Entire Facility Generation Method: Grid Purchase Start Date End Date Energy Use (kWh (thousand Watt-hours)) 05/01 /2009 05/31 /2009 32,800.00 04/01 /2009 04/30/2009 35,000.00 03/01 /2009 03/31 /2009 37,880.00 02/01 /2009 02/28/2009 34,440.00 01/01/2009 01/31/2009 38,800.00 12/01 /2008 12/31 /2008 38,680.00 11 /01 /2008 11 /30/2008 36,400.00 10/01 /2008 10/31 /2008 35,120.00 09/01 /2008 09/30/2008 32,880.00 08/01 /2008 08131 /2008 34,160.00 07/01 /2008 07/31 /2008 35,560.00 06/01 /2008 06/30/2008 31,160.00 Electricity Consumption (kWh (thousand Watt-hours)) 422,880.00 Electricity Consumption (kBtu (thousand Btu)) 1,442,866.56 Total Electricity (Grid Purchase) Consumption (kBtu (thousand Btu)) 1,442,866.56 Is this the total Electricity (Grid Purchase) consumption at this building including all r Electricity meters? L uel uid Propane Meter: Propane (Gallons) Space(s): Entire Facility Start Date End Date Energy Use (Gallons) 05/01/2009 05/31/2009 529.00 04/01 /2009 04/30/2009 2,146.50 03/01 /2009 03/31 /2009 4,973.10 02/01 /2009 02/28/2009 4,010.20 01 /01 /2009 01 /31 /2009 4,082.30 12/01 /2008 12/31 /2008 4,193.70 11 /01 /2008 11 /30/2008 2,622.80 10/01 /2008 10/31 /2008 1,409.80 09/01/2008 09/30/2008 0.00 08/01 /2008 08/31 /2008 354.00 Page 4 of 5 07/01/2008 07/31/2008 0.00 06/01 /2008 06/30/2008 0.00 Propane Consumption (Gallons) 24,321.40 2,228,997.94 Propane Consumption (kBtu (thousand Btu)) Total Liquid Propane Consumption (kBtu (thousand Btu)) 2,228,997.94 ❑ Is this the total Liquid Propane consumption at this building including all Liquid Propane meters? Additional Fuels Do the fuel consumption totals shown above represent the total energy use of this building? Please confirm there are no additional fuels (district energy, generator fuel oil) used in this facility. ❑ On -Site Solar and Wind Energy Do the fuel consumption totals shown above include all on -site solar and/or wind power located at your facility? Please confirm that no on -site solar or wind installations have been omitted from this list. All on -site systems must be reported. Certifying Professional (When applying for the ENERGY STAR, the Certifying Professional must be the same as the PE that signed and stamped the SEP.) Name: Date: Signature: Signature is required when applying for the ENERGY STAR. Page 5 of 5 FOR YOUR RECORDS ONLY. DO NOT SUBMIT TO EPA. Please keep this Facility Summary for your own records; do not submit it to EPA. Only the Statement of Energy Performance (SEP), Data Checklist and Letter of Agreement need to be submitted to EPA when applying for the ENERGY STAR. Facility Truckee Donner Public Utility District 11570 Donner Pass Rd Truckee, CA 96161 General Information Facility Owner Truckee Donner Public Utility District 11570 Donner Pass Rd Truckee, CA 96161 _ Truckee Donner Public Utility District Gross Floor Area Excluding Parking: (ft2) 40,550 Year Built 1986 For 12-month Evaluation Period Ending Date: May 31, 2009 Facility Space Use Summary - Administration Building _ Space Type Office Gross Floor Area(ft2) 21,500 Weekly operating hours 45 Workers on Main Shift 40 Number of PCs 50 Percent Cooled Less than 50% Percent Heated 50% or more MM Garages and Maintenance, O&M Space Type Warehouse (Unrefrigerated) Gross Floor Area(ft2) 8,700 Workers on Main Shift 2 Weekly operating hours 45 Percent Cooled 0 Percent Heated 100 Number of walk-in refrigeration/freezer units 0 Distribution Center, N Primary Contact for this Facility Steven Poncelet 11570 Donner Pass Rd Truckee, CA 96161 Warehouse, O&M Building Space Type Warehouse (Unrefrigerated) Gross Floor Area(ft2) 10,350 Workers on Main Shift 6 Weekly operating hours 45 Percent Cooled 10 Percent Heated 100 Number of walk-in refrigeration/freezer units 0 Distribution Center, Y Energy Performance Comparison _ Evaluation Periods Comparisons Performance Metrics Current (Ending Date 05/31/2009) Baseline (Ending Date 11/30/2007) Rating of 75 Target National Average Energy Performance Rating 14 16 75 N/A 50 Energy Intensi Site (kBtu/ft2) 91 87 41 N/A 57 Source (kBtu/ft2) 174 169 79 N/A 109 Energy Cost $/year N/A N/A N/A N/A N/A $/ft2/year N/A N/A N/A N/A N/A Greenh MtCOze/year 316 305 142 N/A 197 kgCO2e/ft2/year 8 8 4 N/A 5 More than 50% of your building is defined as Office. Please note that your rating accounts for all of the spaces listed. The National Average column presents energy performance data your building would have if your building had an average rating of 50. Notes: o - This attribute is optional. d - A default value has been supplied by Portfolio Manager. 2009 Truckee Donner Public Utility District 11570 Donner Pass Rd Truckee, CA 96161 Portfolio Manager Building ID: 1944627 The energy use of this building has been measured and compared to other similar buildings using the Environmental Protection Agency's (EPA's) Energy Performance Scale of 1-100, with 1 being the least energy efficient and 100 the most energy efficient. For more information, visit energystar.gov/benchmark. This building's score 50 100 This building uses 174 kBtu per square foot per year.* Buildings with a score of *Based on source energy intensity for the 12 month period ending May 2009 75 or higher may qualify for EPA's ENERGY STAR. I certify that the information contained within this statement is accurate and in accordance with U.S. Date of certification Environmental Protection Agency's measurement standards, found at energystar.gov Date Generated: 12/07/2009 APPENDIX B: Building Operation Trend Data Analysis HHW Boiler Supply and Return Temperatures, November 2009 160 150 LL N d O 140 130 Sat 14 Morn 16 Wed 18 Fri 20 Sun 22 Tue 24 HHWS Temp HHWR Temp — — — HHW Delta T 20 18 16 14 LL 10 12 Ol 41 0 10 D 8 R Light Intensity, November 2009 nnnr.................................................................. 800 700 600 0 0 LL 2 500 N 400 E 7 J 300 200 100 0 Sat 14 Mon 15 Wed 18 Fri 20 Sun 22 7ue 24 Thu 26 GIS Office Accounting Office Stairwell Pump Current, Boiler 2 Isolation .............................................................................. 2.78 .......... .............................................................. ................. ............ ...... . 2.76.............................. ............... .. ...... _ ............. ....... . 2.74}........... ......' I`....-.......................................................... .......................... 2.72 .......... ............. V ............... •• V2.70 -- . .......:-•-•-------------.....----------- ....................-:...-.-..... 2.68 ..........-------'------••----•---------- -------'-------'---• 1.• 2.66. ............ ..................... ... .... -....... ..--..- ..... --.... --... 2.64............ ....... ........ ..-........... ... ........ ....-..-.........-..._. 2.62•..-.-............... .... ............................................................... 13:30:00 13:35:00 13:40:00 Pump 1 Current Pump Current, Boiler 2 Re -Enabling 2-82t, 2.80}.......................... . ....... 2,78 ................ ­1­1 ....... ............. ..................... .......... i 2.76 .................................................... ................................ EO2_741• .... ­ ...... .......... .. ......... .. ................. 5D w E < 2,72 ......................................................................... 2,701 ..................................... ...... ................ ... ....... I ................ ....... � ............... 2.68 ......... ...... 2,66t-, - . . .. ........................ . I .......... . _ -.,: ........ ­ ........ ...................................... ...... 2-64 f . . - - .. .................... I ...... I .......................... ..... ­ ...................... 160500 Pump 1 Current 1.0 0.8 0.8 01 0.6 0.5 0A 0.3 0.2 0.1 OA 10:00 Boiler 2 Duty Cycle, 12/08/99 11: 00 12:00 13:00 14:00 15:00 16:00 Boiler Operation (1 is on. 0 is off} APPENDIX C: BAS System Point List Fan Coil Point Type Total Point Count VaNe do 20 Fan command do 20 Fan Status di 20 CA damper do 20 zone temp I ai 1 20 Bathroom Exhaust Fans Point Type Total Point Count Fan Corrynand ao 5 Fan Status ai 5 Locker Room Exhaust Fans Point Type Total Point Court Fan end ao 2 Fan Status ai 2 Warehouse Unit Heaters Point Type Total Point Count Zone Temp ai 4 Unit Heater cone -run l do 4 Unit Heater Status di 4 Boiler Point Type Total Point Count HHWS Temp ai 1 HHWR Temp ai 1 Boiler Enable do 2 Boiler Status di 2 Pump Enable do 2 Pump Status di 2