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Home My WebLink AboutCIRI-5HO-CAEC Hope Elementary High School 2012-EEENERGY AUDIT FINAL REPORT Hope Elementary/High School 19635 Hope Highway Hope, AK 99605 (907) 782-3202 AkWarm ID No. CIRI-5HO-CAEC-01 800 F Street Anchorage, AK 99501 p (907) 276-6664 f (907) 276-5042 Contact: Walter K. Heins, P.E., CCP, CxA, CEA 32215 Lakefront Dr. Soldotna, Alaska 99669 p (907) 260-5311 Contact: Jerry P. Herring, PE, CEA Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 i AkWarm No. CIRI-5HO-CAEC-01 Contents I. Executive Summary .................................................................................................................. 1 II. Introduction .............................................................................................................................. 4 III. Method of Analysis ................................................................................................................. 6 IV. Limitations of Study ............................................................................................................... 7 V. Building Description ................................................................................................................ 8 VI. Historic Energy Consumption and Cost............................................................................. 10 VII. Equipment Inventory and Photo Survey .......................................................................... 11 VIII. Energy Conservation Measures ....................................................................................... 12 IX. Administrative Controls for Energy Conservation and Optimization ............................ 15 Appendices Appendix A – Energy Benchmark Data Appendix B – AkWarm Commercial Reports Appendix C – Major Equipment List Appendix D – Energy Conservation Measures Appendix E – Site Visit Photos Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 ii AkWarm No. CIRI-5HO-CAEC-01 REPORT DISCLAIMER Privacy The information contained within this report, including any attachment(s), was produced under contract to Alaska Housing Finance Corporation (AHFC). IGAs are the property of the State of Alaska, and may be incorporated into AkWarm-C, the Alaska Retrofit Information System (ARIS), or other state and/or public information systems. AkWarm-C is a building energy modeling software developed under contract by AHFC. Limitations of Study This energy audit is intended to identify and recommend potential areas of energy savings, estimate the value of the savings, and provide an opinion of the costs to implement the recommendations. This audit meets the criteria of a Level 2 Investment Grade Audit (IGA) per the American Society of Heating, Refrigeration, Air-conditioning Engineers (ASHRAE) and the Association of Energy Engineers (AEE), and is valid for one year. The life of the IGA may be extended on a case-by-case basis, at the discretion of AHFC. In preparing this report, the preparers acted with the standard of care prevalent in this region for this type of work. All results are dependent on the quality of input data provided. Not all data could be verified and no destructive testing or investigations were undertaken. Some data may have been incomplete. This report is not intended to be a final design document. Any modifications or changes made to a building to realize the savings must be designed and implemented by licensed, experienced professionals in their fields. Lighting upgrades should undergo a thorough lighting analysis to assure that the upgrades will comply with State of Alaska Statutes as well as Illuminating Engineering Society (IES) recommendations. All liabilities for upgrades, including but not limited to safety, design, and performance are incumbent upon the professional(s) who prepare the design. Coffman Engineers, Inc (CEI) and Central Alaska Engineering Company (CAEC) bear no responsibility for work performed as a result of this report. Financial ratios may vary from those forecasted due to the uncertainty of the final installed design, configuration, equipment selected, installation costs, related additional work, or the operating schedules and maintenance provided by the owner. Furthermore, many ECMs are interactive, so implementation of one ECM may impact the performance of another ECM. CEI and CAEC accept no liability for financial loss due to ECMs that fail to meet the forecasted financial ratios. The economic analyses for the ECMs relating to lighting improvements are based solely on energy savings. Additional benefits may be realized in reduced maintenance cost, deferred maintenance, and improved lighting quality. The new generation lighting systems have significantly longer life leading to long term labor savings, especially in high areas like Gyms and exterior parking lots. Lighting upgrades displace re-lamping costs for any fixtures whose lamps would otherwise be nearing the end of their lifecycle. This reduces maintenance costs for 3-7 years after the upgrade. An overall improvement in lighting quality, quantified by numerous studies, improves the performance of students and workers in the built environment. New lighting systems can be designed to address all of the above benefits. US Government Disclaimer This material is based upon work supported by the Department of Energy under Award Number DE-EE0000095. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 1 AkWarm No. CIRI-5HO-CAEC-01 I. Executive Summary This report presents the findings of an energy audit conducted at Hope Elementary/High School as part of a contract for: Alaska Housing Finance Corporation Contact: Scott Waterman 4300 Boniface Parkway Anchorage, AK 99510 Email: swaterma@ahfc.us Kenai Peninsula Borough School District Contact: Dave Spence 139 East Park Avenue Soldotna, AK 99669 Email: dspence@kpbsd.k12.ak.us This audit was performed using ARRA funds to promote the use of innovation and technology to solve energy and environmental problems in a way that improves the State’s economy. This can be achieved through the wiser and more efficient use of energy. The documented annual utility costs, averaged over July 2008-June 2010 at this facility are as follows: Electricity $25,880 Propane $19,518 Total $45,399 July 2008-June 2010 Energy Utilization Index (EUI) = 103.4 kBtu/sf July 2008-June 2010 Energy Cost Index = 2.78 $/sf Energy Conservation Measures calculated to be cost effective are shown below in Table 1 with cost, savings, and investment returns. Be aware that the measures are not additive because of the interrelation of several of the measures. The cost of each measure for this level of auditing is ± 30% until detailed engineering, specifications, and hard proposals are obtained. A table of all ECMs considered is attached as Appendix D, Energy Conservation Measures. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 2 AkWarm No. CIRI-5HO-CAEC-01 Table 1 Recommended Cost Effective Energy Conservation Measures (ECM’s) PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 0* Refrigerators Replace Refrigerators older than 5 years old - - - <10 years 1** Other Electrical: Heat Trace for Soffits Improve Manual Switching, Add blown R- 42 Insulation to Attic $11,078 $55,757 1.60 5.03 2**** Lighting: Type A Fixtures Replace with 94 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,429 $751 29.28 0.5 3**** Lighting: Type R Fixtures Replace with 42 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $406 $781 8.00 1.9 4 Lighting: Type G, O Lights Replace with 27 FLUOR CFL, A Lamp 15W $309 $260 7.29 0.8 5**** Lighting: Type D Fixtures Replace with 20 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $142 $601 3.63 4.2 6 Exterior Door: West School Doors Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $88 $1,074 1.98 12.2 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 3 AkWarm No. CIRI-5HO-CAEC-01 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 7*** HVAC And DHW Replace Burnout Motors with ECM motors $1,376 $10,430 1.81 7.6 8 Lighting: Type C Fixtures Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard (2) HighLight HighEfficElectronic and Add new Occupancy Sensor, Multi-Level Switch $561 $6,910 1.48 12.3 8 Lighting: Type I Fixtures Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic and Add new Occupancy Sensor $9 $121 1.12 13.8 9**** Lighting: Type J Fixtures Replace with 8 LED 50W Module StdElectronic $213 $3,000 1.09 14.1 10 HVAC And DHW Stack Economizer $859 $15,000 1.01 17.5 Total Recommended Measures $16,470 $94,685 1.8 5.75 Note: * Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and result in viable energy savings. ** The AkWarm results output here have been modified after processing to show that Improving the Manual Switching on the Heat Trace for Soffits cannot be completed without installing R-42 blown insulation to the Ceiling w/Attic that covers most of the school. *** This item is intended to be implemented as HVAC pumps burn out and require replacement. This is the cost difference between standard efficient motors and high efficiency Electronically Commutated Motors for all HVAC pumps. ****This item is intended to be implemented once the existing instant start ballasts fail and require replacement, negating the cost of installing new ballasts. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 4 AkWarm No. CIRI-5HO-CAEC-01 II. Introduction This comprehensive energy audit covers the 16,323 square foot Hope Elementary/High School that includes a 15,829 square foot school and a 494 square foot generator building. The school area includes classrooms, locker rooms, restrooms, administrative offices, a wood shop, and a multi-purpose room. The location of the school is shown in the following maps. Hope, Alaska – Google Maps Hope School – Google Maps The first task was to collect and review two years of utility data for electricity and propane usage. This information was used to analyze operational characteristics, calculate energy benchmarks for comparison to industry averages, estimate savings potential and establish a baseline to monitor the effectiveness of implemented measures. An Excel spreadsheet was used to enter, sum, and calculate benchmarks and to graph energy use information (see Appendix A). Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 5 AkWarm No. CIRI-5HO-CAEC-01 The annual Energy Utilization Index (EUI) is expressed in Thousands of British Thermal Units per Square Foot (kBtu/sf) and can be used to compare energy consumption to similar building types or to track consumption from year to year in the same building. The EUI is calculated by converting annual consumption of all fuels used to Btu’s and then dividing by the area (gross conditioned square footage) of the building. EUI is a good indicator of the relative potential for energy savings. A comparatively low EUI indicates less potential for large energy savings. Building architectural, mechanical and electrical drawings were obtained and utilized to calculate the gross area of the facility. The gross area was confirmed on the physical site investigation. After gathering the utility data and calculating the EUI, the next step in the audit process was to review the architectural and engineering drawings to develop a building profile which documented building age, type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating, and Air Conditioning, (HVAC), water heating, refrigeration, snow-melt, and etc. The building profile is utilized to generate, and answer, possible questions regarding the facility’s energy usage. These questions were then compared to the energy usage profiles developed during the utility data gathering step. After this information is gathered, the next step in the process is the physical site investigation (site visit). The site visit was completed on June 29, 2011, and was spent inspecting the actual systems and answering specific questions from the preliminary review. Our on-site contact during the investigation was Mr. John Grimes of the KPBSD Maintenance Department1. Occupancy schedules, O&M practices, building energy management program, and other information that has an impact on energy consumption were obtained. The post-site work includes evaluation of the information gathered during the site visit, researching possible conservation opportunities, organizing the audit into a comprehensive report, and making energy conservation recommendations on mechanical, electrical and building envelope improvements. 1 Mr. John Grimes, (907) 398-6915 (mobile), (907) 224-9530 (office) Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 6 AkWarm No. CIRI-5HO-CAEC-01 III. Method of Analysis Having completed the preliminary audit tasks noted in Section II Coffman Engineers (CEI) proceeded to the site survey. The site survey provides critical input in deciphering where energy opportunities exist within a facility. The audit team walked the entire site to inventory the building envelope (roof, windows, etc.), the major equipment including HVAC, water heating, lighting, and equipment in shops, kitchens, offices, and classrooms. An understanding of how the equipment is used is determined during the audit. The collected data was entered into the AkWarm Commercial™ software, an energy calculating program for buildings. The data was processed by AkWarm to model a baseline from which energy conservation measures (ECMs) could be considered. The model was compared to actual utility costs to ensure the quality of baseline and proposed energy modeling performed by AkWarm. The recommended ECMs focus on building envelope, HVAC, lighting, water heating, and other electrical measures that will reduce annual energy consumption. ECMs are evaluated based on building use and processes, local climate conditions, building construction type, function, operational schedule, existing conditions, and foreseen future plans. When new equipment is proposed, energy consumption is calculated based on the manufacturer’s cataloged information where possible. Energy savings are calculated by AkWarm. Implementation of more than one ECM often affects the savings of other ECMs. The savings may in some cases be relatively higher for an ECM implemented individually than when that ECM is just one of multiple recommended ECMs. For example, implementing reduced operating schedules of inefficient lighting systems may result in a given savings. Also implementing a more efficient lighting system will add to the savings, but less than the efficient lighting would alone because there is less energy to be saved when the lights are on a reduced operating schedule. Thus, if multiple ECM’s are recommended, the combined savings must be calculated and identified appropriately in groups. In Appendix D, Energy Conservation Measures, the simple lifetime calculation is shown for each ECM. The lifetime for each ECM is estimated based on the typical life of the equipment being replaced or altered. The energy savings are extrapolated throughout the lifetime of the ECM. The total energy savings are calculated as the total lifetime multiplied by the yearly savings. Cost savings are calculated based on the historical energy costs for the building. Installation costs include labor and equipment to evaluate the initial investment required to implement and ECM. These are applied to each recommendation with simple paybacks calculated. The energy analyst’s opinions of probable cost are garnered from Means Cost Data, other industry publications, and local contractors and suppliers. In addition, where applicable, maintenance cost savings are estimated and applied to the net savings. The costs and savings are applied to calculate simple payback2, Savings to Investment Ratio3 (SIR).These are listed in Appendix D and summarized in Table 1 of this report. The SIR is calculated as a ratio by dividing the break even cost by the initial installed cost. 2 The simple payback is based on the years that it takes for the net savings to payback the net installation cost (Cost divided by Savings). 3 Savings to Investment Ratio (SIR): Break Even Cost divided by initial installed cost, where Break-Even Cost is how much can be spent and still have the measure be cost effective; it equals the Present Value (PV) of Savings over the life of the measure minus PV of maintenance costs. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 7 AkWarm No. CIRI-5HO-CAEC-01 IV. Limitations of Study All results are dependent on the quality of input data provided. In this case, data were incomplete, and the site investigation was limited to observable conditions. No testing or destructive investigations were undertaken. Although Energy-conserving methods are described in the ECMs, in some instances several methods may also achieve the identified savings. Detailed engineering is required in order to develop the ECMs to a realizable project. This audit and report are thus intended to offer approximations of the results achievable by the listed improvements. This report is not intended to be a final design document. The design professional or other persons following the recommendations shall accept responsibility and liability for the results. Budget for engineering and design of these projects is not included in the cost estimate for each measure. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 8 AkWarm No. CIRI-5HO-CAEC-01 V. Building Description Hope School is a single story facility with various usage spaces and schedules. It is a steel framed wood siding building constructed in 1987, with only minor changes in original equipment and modifications. The school has a multi-purpose gymnasium, locker rooms, kitchen, library, four classrooms, and an administrative area. The facility is normally occupied from 7pm to 5pm five days a week during the school year, which is typically late August through late May. There are approximately 17 occupants during regular school hours. Community events are occasionally held on Saturdays in the Multi-Purpose Room, and attendance will vary. In summer months, the school is unoccupied, but the HVAC systems are kept in service. Exterior walls of the building are mostly stud wall construction with plywood sheathing, batt insulation, a vapor barrier, and drywall, with studs on 16” centers. The estimated R-Value is R-19. Wall height in most rooms throughout the building is 10 feet high, and most rooms have a soffit space over the suspended ceiling. Since the roof is sloped, the soffit height varies throughout the facility. The site visit and an analysis of the construction drawings show there is 480 square feet of belowground wall, 8,620 square feet of aboveground (stud) wall, and a generator building with 1170 square feet of stud wall. Floor construction for the school is slab-on-grade. Edge insulation and sheathing for it is provided for the entire perimeter. There is 14,275 square feet of slab-on-grade floor area for the school and 494 square feet for the generator building. There is a total floor area of 16,323 square feet. This floor area includes the fan and mechanical room areas located in the second story soffit spaces of the school, in addition to the generator building area. Roof construction is metal roofing, sheathing, an air gap, 12” of batt insulation, a vapor barrier, and the ceiling finish. The estimated R-Value is R-32. Analysis of the building shows a roof area of 15,048 square feet of roof area for the school and 500 square feet of roof area for the generator building. Retained snowpack on the roof slowly melts, causing ice dams at the cold roof eaves. Seasonally switched electric heat trace was added in order to prevent heavy ice buildup. The heat trace runs continuously when switched on in the winter. Rooms with windows are on the south face of the building, which have an estimated R-Value of R-2. The main arctic entry and the secondary entry are glass walled, with an estimated R-Value of R-2. South- facing window area is 590 square feet and windows facing all other directions are a total of 440 square feet. The building is mainly heated by a hydronic system using fintube elements. Two propane-fired boilers heat the system, which uses water as its fluid medium. Each boiler has an associated boiler loop circulation pump, and the boiler loop combines into a distribution manifold, from which several inline pumps circulate heating water throughout the building. Both boilers are identical Weil-McLain BL- 975SW units with Gordon-Piatt burners, and each is rated for 794 MBH gas input. All pumps are Grundfos pumps, appropriately sized for flow and pressure depending on their application. There are a total of two boiler loop pumps, one domestic hot water heater injection pump, a hot water recirculation pump, and four building circulation pumps. All ventilation units have hydronic coils fed from the hydronic system. No mechanical cooling is provided for any equipment in the building. There are three air handling units and one make-up air unit. AHU-1 serves the wood shop spaces with 1,075 cubic feet per minute (CFM) of air moved by a 1/2 horsepower fan. Observations made during the site visit showed that the nameplate was torn off the unit at some point, but it is likely a Pace SCF-85A small cabinet fan. AHU-2 is a Pace A-12 unit and serves all of the school but the multipurpose room, kitchen, and wood shop. It is powered by a 3 horsepower motor Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 9 AkWarm No. CIRI-5HO-CAEC-01 and moves 4,530 CFM of air. AHU-3 is a Pace A-18 unit and serves only the multipurpose room, and has a 3 horsepower motor moving 6,210 CFM of air. All air handling units are constant volume, and run on occupancy schedules. A makeup air unit, a Pace small cabinet fan model SCF-85A, serves the kitchen. As-built plans show the equipment tag as either MMU-1 or MUU-1; however equipment tags on the unit are labeled MAU-1. The unit moves 1000 CFM of air and uses a 1/2 horsepower fan. Additionally, one of the heating coils for the makeup air unit is an electric coil, in order to supplement the hydronic coil. The unit is constant volume, and is interlocked with the range exhaust hood, which operates on a manual switch with an off-timer. All of the ventilation units, while well-maintained and in good working condition, are considered near the end of their service life, since they are part of original construction of the building in 1987. The 2011 ASHRAE Handbook for HVAC Applications, Chapter 37, Table 4, lists the estimated service life of a centrifugal fan as 25 years, a water heating coil as 20 years, an electric heating coil as 15 years, a cast iron boiler at 35 years, a burner as 21 years, and inline pumps as 10 years. The primary consequence of aging equipment is deterioration in reliability with commensurate increases in maintenance and repair costs. Building hot water is provided by an Amtrol 120 gallon indirect hot water heater. The hot water system is equipped with a circulation pump to provide hot water on demand for plumbing fixtures throughout the building. The hot water heater was installed within the last two years and replaced the original propane- fired hot water heater. The water heater, the hot water circulation pump, and the heating water injection pump associated with the water heater are all in good condition. Several different lighting fixtures are used throughout the school. All interior fixtures are controlled with manual switching. Some rooms have multiple lighting zones, and no fixtures utilize bilevel switching. Most fixtures throughout the facility utilize two fluorescent 4’ long T8 lamps with electronic ballasts, mounted in recessed lensed troffers. The multipurpose room is lighted with 400W metal halide high bay fixtures with magnetic ballasts. Exterior fixtures are all high pressure sodium lamps with magnetic ballasts. Exterior downlight fixtures have 70W lamps, and exterior wallpack fixtures have 200W lamps. Exterior pole-mounted fixtures utilize 400W high pressure sodium lamps. All exterior fixtures are switched on and off with a combination of a time clock and daylight sensors. Both the daylight sensor and the time clock must be satisfied to turn on or off the exterior lights. The building energy management and control system utilizes a pneumatic compressor and control lines. The system has been well maintained and appeared to be in good working order during the site visit. Pneumatic systems, however, are considered archaic due to the vast improvements in monitoring, control and operating efficiencies available from the modern genre of electronic control systems. The energy management and control system controls the boilers, heating water pumps, and air handling units. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 10 AkWarm No. CIRI-5HO-CAEC-01 VI. Historic Energy Consumption and Cost Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and propane gas energy usage for the surveyed facility from July 2008 through June 2010. Chugach Electric provides the electricity and Suburban provides the propane gas to the building. Both utilities bill under their commercial rate schedules. The electric utility bills for consumption in kilowatt-hours (kWh) and for maximum demand in kilowatts (kW). One kilowatt-hour is equivalent to 3413 BTUs. The consumption (kWh) is determined as the wattage times the hours it is running. For example, 1,000 watts running for one hour, or 500 watts running for two hours. The maximum demand is simply the sum of all electrical devices on simultaneously. For example, ten, 100 watt lights running simultaneously would create a demand of 1,000 watts (1 kW). Demand is averaged over rolling window, usually 15 minutes. Thus, the facility must be concerned not only with basic electricity usage (consumption) but also the rate at which it gets used. The basic usage charges are shown as generation service and delivery charges along with several non-utility generation charges. The propane gas supplier bills for consumption in gallons of propane. Propane is delivered under a contract to top off the tank on a monthly basis. The average heating value of propane gas is 91,800 BTUs per gallon, which is equal to approximately 0.92 Therms of energy. The average billing rates for energy use are calculated by dividing the total cost by the total usage. Based on the electric and propane gas utility data provided, the 2009 and 2010 costs for the energy and consumption at the surveyed facility are summarized in Table 2 below. Table 2 Energy Cost and Consumption Data for 2009 and 2010 2009 2010 Electric 0.14 $/kWh 0.12 $/kWh Propane Gas 1.80 $/Gal 1.70 $/Gal Total Cost $47,999 $42,798 ECI 2.94 $/sf 2.62 $/sf Electric EUI 43.0 kBtu/sf 40.9 kBtu/sf Propane EUI 62.3 kBtu/sf 60.7 kBtu/sf Building EUI 105.3 kBtu/sf 101.6 kBtu/sf The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The building square footage was calculated to be approximately 16,323 square feet. This includes 15,829 square feet for the school and 494 square feet for the generator building. The Energy Utilization Index (EUI) is a measure of a building’s energy utilization per square foot of building. This calculation is completed by converting the building’s utility consumption (propane gas and electric) over a specified time period, typically one year, to British Thermal Units (BTU) and dividing this number by the building square footage. EUI is a good measure of a building’s energy use and is utilized regularly for comparison of energy performance amongst buildings of similar type. The electric and propane gas EUI figures can be separated to analyze the comparative energy use. The EUI numbers for this facility are listed above. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 11 AkWarm No. CIRI-5HO-CAEC-01 VII. Equipment Inventory and Photo Survey Following the completion of the field survey a detailed equipment list was created and is attached as Appendix C. The major equipment listed are considered to be the major energy consuming equipment in the building whose replacement could yield substantial energy savings. An approximate age was assigned to the equipment if a manufactures date was not shown on the equipment’s nameplate. As listed in the 2011 ASHRAE Handbook for HVAC Applications, Chapter 37, Table 4, the service life for the equipment along with the remaining useful life in accordance to the ASHRAE standard are also noted in the equipment list. Where there are zero (0) years remaining in the estimated useful life of a piece of equipment, this is an indication that maintenance costs are likely on the rise and more efficient replacement equipment is available which will lower the operating costs of the unit. Maintenance costs should also fall with the replacement. Additionally, photos of various equipment and the building construction were taken during the site visit. Several photos are included in Appendix E. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 12 AkWarm No. CIRI-5HO-CAEC-01 VIII. Energy Conservation Measures The following ECMs described here have been calculated by AkWarm Commercial and considered by the energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios (SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered and calculated by the energy audit team, including ECMs not recommended at this time, please see Appendix D. ECM #0 – Replace Refrigerators older than 5 years old Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and result in viable energy savings. ECM #1 – Add insulation to Cold Roof, Shut off Soffit Heat Trace The heat trace at Hope School can be shut off completely if adequate insulated is added to the roof construction. Currently, the heat trace is enabled in the fall and disabled in the spring and is used to prevent ice dams near the roof eaves. It operates using an outdoor temperature sensor and is on anytime the temperature is between 20-37°F. By adding insulation under the roof, the roof surface would stay cold, preventing accumulated snow from melting and thus eliminating the need for the electric heat trace. This will save approximately $10,000 in energy per year, and have an initial cost of approximately $56,000. The savings-to-investment ratio (SIR) is approximately 1.15 and the simple payback is approximately 5.6 years. ECM #2 – Replace the Instant Start Electronic Ballasts with Programmable Start Ballasts in all Type 'A' Light Fixtures in the Classrooms and Install Ceiling Mounted Occupancy Sensors for Control. The original type 'A' light fixtures installed in the Hope School classrooms were 1' by 4' 2 lamp T12 fluorescent troffer fixtures with magnetic ballasts. Nearly every light fixture has since been upgraded with T8 lamps and instant start electronic ballasts. It is recommended that the existing instant start ballasts be replaced with programmable start electronic ballasts and new occupancy sensors be installed in each classroom and office. Programmable start ballasts are recommended because occupancy sensors shorten the life of the lamps and the instant start ballasts, due to frequent switching. By providing programmable start ballasts and occupancy sensor control of the classrooms in Hope School approximately $1,400 will be saved annually, with an initial cost of $750. This installed cost is for the occupancy sensors only. It is recommended that the programmable start ballasts be replaced when the existing instant start ballast fails, rather than replacing instant start ballasts that are operating normally. The savings-to-investment ratio (SIR) is approximately 29.28 and the simple payback is approximately 0.5 years. ECM #3 – Replace the Instant Start Electronic Ballasts with Programmable Start Ballasts in all Type 'R' Light Fixtures in the Offices, Library, and Restrooms, and install Occupancy Sensors for Control. The original type 'R' light fixtures installed in the Hope School offices, library and restroom vestibules were 1' by 4' 2 lamp T12 fluorescent surface mounted fixtures with magnetic ballasts. Nearly every light fixture has since been upgraded with T8 lamps and instant start electronic ballasts. It is recommended that the existing instant start ballasts be replaced with programmable start electronic ballasts and new occupancy sensors be installed in each classroom and office. Programmable start ballasts are Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 13 AkWarm No. CIRI-5HO-CAEC-01 recommended because occupancy sensors shorten the life of the lamps and the instant start ballasts, due to frequent switching. By providing programmable start ballasts and occupancy sensor control of the offices, library and restroom vestibules in Hope School in Hope School approximately $400 will be saved annually, with an initial cost of $781. This installed cost is for the occupancy sensors only. It is recommended that the programmable start ballasts be replaced when the existing instant start ballast fails. The savings-to- investment ratio (SIR) is approximately 8.00 and the simple payback is approximately 1.9 years. ECM #4 – Re-lamp the Existing Type 'G', and Type 'O' Light Fixtures with Compact Fluorescent Lamps. The existing type 'G' recessed down lights and type 'O' porcelain socket light fixtures are equipped with incandescent lamps. By replacing the incandescent lamps with compact fluorescent lamps approximately $300 will be saved annually, with an initial cost of $260. The savings-to-investment ratio (SIR) is approximately 7.29 and the simple payback is approximately 0.8 years. ECM #5 – Replace the Instant Start Electronic Ballasts with Programmable Start Ballasts in all Type 'D' Light Fixtures in the Restrooms, and install Occupancy Sensors for Control. The original type 'D' light fixtures installed in the Hope School restrooms were 4' 2 lamp T12 fluorescent surface mounted strip light fixtures with magnetic ballasts. Nearly every light fixture has since been upgraded with T8 lamps and instant start electronic ballasts. It is recommended that the existing instant start ballasts be replaced with programmable start electronic ballasts and new occupancy sensors be installed in each classroom and office. Programmable start ballasts are recommended because occupancy sensors shorten the life of the lamps and the instant start ballasts, due to frequent switching. By providing programmable start ballasts and occupancy sensor control of the restrooms in Hope School approximately $140 will be saved annually, with an initial cost of $600. This installed cost is for the occupancy sensors only. It is recommended that the programmable start ballasts be replaced when the existing instant start ballast fails. The savings-to-investment ratio (SIR) is approximately 3.63 and the simple payback is approximately 4.2 years. ECM #6 – Replace West School Doors with R-6 doors ECMs for replacing all of the school doors were considered, however; AkWarm’s calculations show that only one set of doors is worth replacing. New, high-R-Value doors would be installed at a cost of approximately $1,074, saving approximately $104 per year in energy costs, with an SIR of 2.34 and a payback of 10.3 years. ECM #7 – Replace Burnout Motors with ECM motors The existing pumps are all constant-speed pumps. New, high efficiency pumps with electronically commutated (EC) motors will allow the pump to slow down with significant electrical savings. By upgrading to the EC pumps at the time of the next required pump repair, then the marginal cost of choosing high efficiency EC pumps over standard replacement pumps is only $10,430. This repair cost offers a simple payback of 7.6 years, resulting in an SIR of 1.81. Replacing the existing pumps now (while they are still functional), the replacement cost of EC pumps is $19,420 with an energy savings of $1,376. The SIR for the replacement is 0.97 with a 14.1 year payback period. However the repair upgrade is recommended as it is the most cost effective option. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 14 AkWarm No. CIRI-5HO-CAEC-01 ECM #8 – Replace the Existing Type 'C' High Bay Metal Halide Light Fixtures with T5HO high bay Light Fixtures in the Gym. The existing type 'C' light fixtures installed in the Hope School gym are 400W metal halide high bay light fixtures. By replacing the existing high bay light fixtures with 6 lamp T5HO high bay light fixtures with bi-level switching that are controlled by occupancy sensors approximately $560 will be saved annually, with an initial cost of $7,000. The savings-to-investment ratio (SIR) is approximately 1.48 and the simple payback is approximately 12.3 years. ECM #9 – Replace the Instant Start Electronic Ballasts with Programmable Start Ballasts in all Type 'I' Light Fixtures in the Gym Storage Room, and install Occupancy Sensors for Control. The original type 'I' light fixtures installed in the Hope School gym storage room were 4' 2 lamp T12 fluorescent surface mounted light fixtures with magnetic ballasts. Nearly every light fixture has since been upgraded with T8 lamps and instant start electronic ballasts. It is recommended that the existing instant start ballasts be replaced with programmable start electronic ballasts and new occupancy sensors be installed in each classroom and office. Programmable start ballasts are recommended because occupancy sensors shorten the life of the lamps and the instant start ballasts, due to frequent switching. By providing programmable start ballasts and occupancy sensor control of the gym storage room in Hope School approximately $10 will be saved annually, with an initial cost of $120. This installed cost is for the occupancy sensors only. It is recommended that the programmable start ballasts be replaced when the existing instant start ballast fails. The savings-to-investment ratio (SIR) is approximately 1.12 and the simple payback is approximately 13.8 years. ECM #10 – Replace the Type 'J' Canopy Light Fixtures with LED Canopy Light Fixtures. The existing exterior type 'J' canopy light fixtures are equipped with 100W high pressure sodium (HPS) lamps and are controlled by a photocell and a timer to shutdown the lights during the night. By replacing the existing HPS light fixtures with LED light fixtures approximately $210 will be saved annually, with an initial cost of $3000. The savings-to-investment ratio (SIR) is approximately 1.09 and the simple payback is approximately 14.1 years. ECM #11 – Add Stack Economizer to Boilers The boilers are original construction, and are very well maintained. One stack economizer can be added to the boilers’ common flue vent, increasing the combustion efficiency of both boilers, whether they are firing independently or both at the same time. All ECMs considered, including those which did not provide an economic SIR or payback, can be found in Appendix D, Energy Conservation Measures. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 15 AkWarm No. CIRI-5HO-CAEC-01 IX. Administrative Controls for Energy Conservation and Optimization While the intent of many energy conservation measures is to increase the efficiency of fuel-burning and electrical equipment, an important factor of energy consumption lies in the operational profiles which control the equipment usage. Such profiles can be managed by administrative controls and departmental leadership. They determine how and when fuel-burning and electrical equipment are used, and therefore have a greater impact on energy savings potential than simply equipment upgrades alone. Significant energy cost savings can be realized when ECMs are combined with efficient-minded operational profiles. Operational profiles may be outlined by organization policy or developed naturally or historically. These profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies, maintenance schedules, and site and equipment selection. Optimization of operational profiles can be accomplished by numerous methods so long as the intent is reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost savings solely as a result of operational optimization are difficult to predict. Quantification, however, is easy to accomplish by metering energy usage during and/or after implementation of energy-saving operational profiles and ECMs. Shown below are some examples which have proven successful for other organizations. Optimization of site selection includes scheduling and location of events. If several buildings in a given neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after- hours events are consolidated and held within the most energy efficient buildings available for use. As a result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy consumption. Two operational behaviors which can be combined with equipment upgrades are operating schedules and equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun. Operating schedules can be optimized to run equipment only during regular or high-occupancy periods. Also, through a central control system, or with digital programmable thermostats, temperature setpoints can be reduced during low-occupancy hours to maximize savings. In addition, sporadically used equipment can be shut down during unoccupied hours to further save energy. In general, having equipment operating in areas where no occupants are present is inefficient, and presents an opportunity for energy savings. Operational profiles can also be implemented to take advantage of no- or low-cost ECMs. Examples include heating plant optimizations (boiler section cleaning, boiler flush-through cleaning) and tighter controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to and finer control of equipment for after-hours control). In a large facility management program, implementation of these measures across many or all sites will realize dramatic savings due to the quantity of equipment involved. Changes to building operational profiles can only be realized while simultaneously addressing health, safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or implement operational behaviors which do not meet such considerations. That said, it is quite practical for management groups to implement administrative controls which reduce losses brought about by excess and sub-optimum usage. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Appendix A Energy Benchmark Data First Name Last Name Middle Name Phone Paul Brenner 907‐714‐8825 State Zip AK 99669 Monday‐ Friday Saturday Sunday Holidays 7 to 50 0 0 Average # of Occupants During 17 0 0 0 Renovations / Notes Date None Contact Person Email pbrenner@kpbsd.k12.ak.us Mailing Address City 148 N. Binkley St Soldotna Primary Operating Hours Details Facility Address Facility City Facility Zip 19635 Hope Hwy Hope 99605 Building Type Community Population Year Built School 137 1987 Building Name/ Identifier Building Usage Building Square Footage Hope Education 16,323 KPBSD Municipal 03/15/11 REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner Facility Owned By Date Note: PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton Other energy sources? 2. Provide utilities bills for the most recent two‐year period for each energy source you use. 1. Please check every energy source you use in the table below. If known, please enter the base rate you pay for the energy source. Drawings are maintained at district maintenance office in Soldotna. Coffman Engineers, Inc. Project No. 11333 Hope Elementary/High School Final Energy Audit Report Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Hope Buiding Size Input (sf) =16,323 2009 Electric Consumption (kWh)205,600 2009 Electric Cost ($)29,128 2009 Propane Consumption (Therms)10,164 2009 Propane Cost ($)18,871.77 2009 Total Energy Use (kBtu)1,718,077 2009 Total Energy Cost ($)47,999 Annual Energy Use Intensity (EUI) 2009 Electricity (kBtu/sf)43.0 2009 Propane (kBtu/sf) 62.3 2009 Energy Utilization Index (kBtu/sf)105.3 Annual Energy Cost Index (ECI) 2009 Electric Cost Index ($/sf)1.78 2009 Propane Cost Index ($/sf)1.16 2009 Energy Cost Index ($/sf)2.94 2010 Electric Consumption (kWh)195,640 2010 Electric Cost ($)22,633 2010 Propane Consumption (Therms)9,909 2010 Propane Cost ($)20 164 992010 Propane Cost ($)20,164.99 2010 Total Energy Use (kBtu)1,658,627 2010 Total Energy Cost ($)42,798 Annual Energy Use Intensity (EUI) 2010 Electricity (kBtu/sf)40.9 2010 Propane (kBtu/sf)60.7 2010 Energy Utilization Index (kBtu/sf)101.6 Annual Energy Cost Index (ECI) 2010 Electric Cost Index ($/sf)1.39 2010 Propane Cost Index ($/sf)1.24 20010 Energy Cost Index ($/sf)2.62 Note: 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's Coffman Engineers, Inc. Project No. 11333 Hope Elementary/High School Final Energy Audit Report Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 HopeElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)Chugach Electric 90294-010 Jul-08 6/19/2008 7/21/2008 328,32028428$1,070$0.13Chugach Electric 90294-010 Aug-08 7/22/2008 8/21/2008317,20024632$1,015$0.14Chugach Electric 90294-010 Sep-08 8/22/2008 9/23/20083311,20038234$1,446$0.13Chugach Electric 90294-010 Oct-08 9/24/2008 10/23/20083011,96040835$1,528$0.13Chugach Electric 90294-010 Nov-08 10/24/2008 11/20/20082814,96051154$2,004$0.13Chugach Electric 90294-010 Dec-08 11/21/2008 12/23/20083323,48080174$3,589$0.15Chugach Electric 90294-010 Jan-09 12/24/2008 1/22/20093028,36096869$4,090$0.14Chugach Electric 90294-010 Feb-09 1/23/2009 2/23/20093228,36096878$4,187$0.15Chugach Electric 90294-010 Mar-09 2/24/2009 3/25/20093023,64080767$3,319$0.14Chugach Electric 90294-010 Apr-09 3/26/2009 4/23/20092924,20082666$3,365$0.14Chugach Electric 90294-010 May-09 4/24/2009 5/22/20092915,76053851$2,300$0.15Chugach Electric 90294-010 Jun-09 5/23/2009 6/23/2009328,16027939$1,215$0.15Chugach Electric 90294-010 Jul-09 6/24/2009 7/23/2009305,80019822$815$0.14Chugach Electric 90294-010 Aug-09 7/24/2009 8/24/2009326,92023633$1,034$0.15Chugach Electric 90294-010 Sep-09 8/25/2009 9/22/20092912,72043436$1,534$0.12Chugach Electric 90294-010 Oct-09 9/23/2009 10/22/20093018,9206460$1,980$0.10Chugach Electric 90294-010 Nov-09 10/23/2009 11/20/20093018,92064664$1,980$0.10Chugach Electric90294-010Dec-0911/21/200912/21/20093122,68077471$2,769$0.12Chugach Electric90294-010Dec-0911/21/200912/21/20093122,68077471$2,769$0.12Chugach Electric 90294-010 Jan-10 12/22/2009 1/20/20103024,08082275$2,670$0.11Chugach Electric 90294-010 Feb-10 1/21/2010 2/18/20102924,28082969$2,614$0.11Chugach Electric 90294-010 Mar-10 2/19/2010 3/19/20102923,40079968$2,542$0.11Chugach Electric 90294-010 Apr-10 3/20/2010 4/20/20103216,68056954$1,966$0.12Chugach Electric 90294-010 May-10 4/21/2010 5/21/20103111,48039242$1,425$0.12Chugach Electric 90294-010 Jun-10 5/22/2010 6/21/2010319,76033342$1,301$0.13Jul - 08 to Jun - 09 total:205,6007,017626$29,128$0Jul - 09 to Jun - 10 total:195,6406,677575$22,633$0Jul - 08 to Jun - 09 avg:$0.14Jul - 09 to Jun - 10 avg:$0.12Hope Elementary/High School Energy Audit Report Coffman Engineers, Inc. Project No. 11333 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 $2,500$3,000$3,500$4,000$4,50020,00025,00030,000Electric Cost ($)Electric Consumption (kWh)Hope Elementary/High School - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)$0$500$1,000$1,500$2,00005,00010,00015,000Electric Cost ($)Electric Consumption (kWh)Date (Mon - Yr)Electric Consumption (kWh)Electric Cost ($)Hope Elementary/High School Energy Audit Report Coffman Engineers, Inc. Project No. 11333 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 HopePropaneBtus/Gal =91,800ProviderCustomer #MonthStart DateEnd DateBilling DaysConsumption (Gal)Consumption (Therms)Demand UsePropane Gas Cost ($)Unit Cost ($/Therm)Demand Cost ($)Suburban1725-000024836-002Jul-087/1/20087/31/200830600551$1,4412.62Suburban1725-000024836-002Aug-088/1/20088/31/200830232213$5262.48Suburban1725-000024836-002Sep-089/1/20089/30/200829263241$5802.40Suburban1725-000024836-002Oct-0810/1/200810/31/200830609559$1,1742.10Suburban1725-000024836-002Nov-0811/1/200811/30/2008291,062975$2,0402.09Suburban1725-000024836-002Dec-0812/1/200812/31/2008301,2461,144$2,3922.09Suburban1725-000024836-002Jan-091/1/20091/31/2009302,1281,953$3,2541.67Suburban1725-000024836-002Feb-092/1/20092/28/2009271,1371,044$2,0431.96Suburban1725-000024836-002Mar-093/1/20093/31/2009301,2341,133$1,9211.69Suburban1725-000024836-002Apr-094/1/20094/30/2009291,1231,031$1,7421.69Suburban1725-000024836-002May-095/1/20095/31/2009301,011928$1,2261.32Suburban1725-000024836-002Jun-096/1/20096/30/200929427392$5351.37Suburban1725-000024836-002Jul-097/1/20097/31/200930319293$4161.42Suburban1725-000024836-002Aug-098/1/20098/31/200930465427$5881.38Suburban1725-000024836-002Sep-099/1/20099/30/200929458420$6251.49Suburban1725-000024836-002Oct-0910/1/200910/31/200930541497$6831.38Suburban1725-000024836-002Nov-0911/1/200911/30/200929800734$1,0071.37Suburban1725-000024836-002Dec-0912/1/200912/31/2009301,2761,171$2,5652.19Suburban1725-000024836-002Jan-101/1/20101/31/2010301,7411,598$3,9952.50Suburban1725-000024836-002Jan-101/1/20101/31/2010301,7411,598$3,9952.50Suburban1725-000024836-002Feb-102/1/20102/28/2010271,4931,370$3,3662.46Suburban1725-000024836-002Mar-103/1/20103/31/2010301,065977$2,1622.21Suburban1725-000024836-002Apr-104/1/20104/30/2010291,4661,346$2,6411.96Suburban1725-000024836-002May-105/1/20105/31/201030667612$1,2262.00Suburban1725-000024836-002Jun-106/1/20106/30/201029505463$8921.92Jul - 08 to Jun - 09 total:11,07210,1640$18,872$0Jul - 09 to Jun - 10 total:10,7949,9090$20,165$0Jul - 08 to Jun - 09 avg:1.96Jul - 09 to Jun - 10 avg:1.86Hope Elementary/High School Energy Audit Report Coffman Engineers, Inc. Project No. 11333 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 $2,500 $3,000 $3,500 $4,000 $4,500 1,5002,0002,500Propane Cost ($)Propane Consumption (Therms)Hope Elementary/High School - Propane Consumption (Therms) and Propane Cost ($)$0 $500 $1,000 $1,500 $2,000 $2,500 05001,000Propane Cost ($)Propane Consumption (Therms)Date (Mon - Yr)Propane Consumption (Therms)Propane Cost ($)Hope Elementary/High School Energy Audit Report Coffman Engineers, Inc. Project No. 11333 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Appendix B AkWarm Commercial Reports Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Hope Elementary/High School Page 18 ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 9/9/2011 9:54 AM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Hope Elementary/High School Auditor Company: Coffman Engineers Address: 19635 Hope Highway Auditor Name: David Nicolai City: Hope Auditor Address: 800 F Street Anchorage, AK 99501 Client Name: Paul Brenner Client Address: 148 N. Binkley St. Soldotna, AK 99669 Auditor Phone: (907) 276-6664 Auditor FAX: (907) 276-5042 Client Phone: (907) 714-8825 Auditor Comment: Client FAX: Design Data Building Area: 16,323 square feet. This area includes the 15,829 square foot school and a 494 square foot generator building. Design Heating Load: Design Loss at Space: 498,818 Btu/hour with Distribution Losses: 509,159 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 776,157 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 19 people Design Indoor Temperature: 59 deg F (building average) Actual City: Hope Design Outdoor Temperature: -18 deg F Weather/Fuel City: Hope Heating Degree Days: 10,100 deg F-days Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Utility Information Electric Utility: Chugach Electric - Commercial - Sm Natural Gas Provider: None Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.000/ccf Annual Energy Cost Estimate Descript ion Htg Cooling Dom Hot Wtr Lighting Other Electrical Cook ing Clothes Drying Vent Fans Service Fees Total Cost Existing Building $17,236 $0 $4,515 $7,039 $16,089 $173 $252 $988 $0 $47,044 With Proposed Retrofits $14,767 $0 $4,347 $3,643 $6,063 $173 $252 $988 $0 $30,985 SAVING S $2,469 $0 $167 $3,396 $10,027 $0 $0 $0 $0 $16,059 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 $0 $10,000 $20,000 $30,000 $40,000 $50,000 Existing Retrofit Propane Electricity Annual Energy Costs by Fuel Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Appendix C Major Equipment List Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODELTYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE NOTES B‐1 BOILER RM BUILDING HEATING WEIL‐MCLAIN BL‐975SW CAST IRON PROPANE FUEL 794 MBH ≈ 80% 30 6 B‐2 BOILER RM BUILDING HEATING WEIL‐MCLAIN BL‐975SW CAST IRON PROPANE FUEL 794 MBH ≈ 80% 30 6 CP‐1 BOILER RM HEATING WATER CIRC GRUNDFOS UMS 50‐80 INLINE 40GPM 15' NEMA STANDARD 1/3 10 0 CP‐2 BOILER RM HEATING WATER CIRC GRUNDFOS UMS 50‐80 INLINE 20GPM 15' NEMA STANDARD 1/3 10 0 CP‐3 BOILER RM HEATING WATER CIRC GRUNDFOS UPS 50‐160C INLINE 40GPM 25' NEMA STANDARD 3/4 10 0 CP‐4 BOILER RM HEATING WATER CIRC GRUNDFOS UPS 50‐160C INLINE 35GPM 25' NEMA STANDARD 3/4 10 5 CP‐5 BOILER RM BOILER CIRCULATION GRUNDFOS UMS 65‐40 INLINE 35 GPM 10' NEMA STANDARD 1/3 10 5 CP‐6 BOILER RM BOILER CIRCULATION GRUNDFOS UMS 65‐40 INLINE 35 GPM 10' NEMA STANDARD 1/3 10 5 CP‐7 BOILER RM DHW INJECTION GRUNDFOS UP 26‐64F INLINE 5GPM 18' NEMA STANDARD 1/12 10 5 CP‐8 BOILER RM DHW CIRCULATION GRUNDFOS UP 26‐64F INLINE NEMA STANDARD 10 8 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODELTYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE NOTES AHU‐1 WEST MECH RM SHOP AHU PACE SCF‐85A CABINET FAN 1075 CFM NEMA STANDARD 1/2 25 1 AHU‐2 EAST MECH RM SCHOOL PACE A‐12 PACKAGED 4530 CFM NEMA STANDARD 3 25 1 AHU‐3 EAST MECH RM MULTIPURPOSE RM PACE A‐18 PACKAGED 6210 CFM NEMA STANDARD 3 25 1 MMU‐1 EAST MECH RM KITCHEN PACE SCF‐85A MAKEUP 1000 CFM NEMA STANDARD 1/2 25 1 EF‐1 WEST MECH RM TOILET EXHAUST PACE U‐8F CENTRIFUGAL 570 CFM NEMA STANDARD 1/2 25 1 EF‐2 EAST MECH RM TOILET EXHAUST PACE CENTRIFUGAL ≈880 CFM NEMA STANDARD 1/2 25 1 EF‐3 KILN KILN PACE U‐12F CENTRIFUGAL 1376 CFM NEMA STANDARD 1/2 25 1 EF‐4 SHOP WELDING EXHAUST CAR‐MON CMB‐8 800 NEMA STANDARD 1/2 25 1 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODELTYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE NOTES EF‐5 WEST MECH RM DARKROOM PENNZEPHER Z‐9 INLINE 110 NEMA STANDARD 185W 25 1 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Appendix D Energy Conservation Measures Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 The following tables consist of raw output data from the AkWarm Commercial program used to model energy costs and calculate energy savings and financial ratios. These tables represent all of the energy conservation measures calculated and considered by the energy audit team. However, ECMs included in the Executive Summary and Section VIII are recommended by the energy audit team due to their viable financial ratios (SIR>1) or due to their value added. PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 0* Refrigerators Replace Refrigerators older than 5 years old - - - <10 years 1** Other Electrical: Heat Trace for Soffits Improve Manual Switching, Add blown R- 42 Insulation to Attic $11,078 $55,757 1.60 5.03 2**** Lighting: Type A Fixtures Replace with 94 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,429 $751 29.28 0.5 3**** Lighting: Type R Fixtures Replace with 42 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $406 $781 8.00 1.9 4 Lighting: Type G, O Lights Replace with 27 FLUOR CFL, A Lamp 15W $309 $260 7.29 0.8 5**** Lighting: Type D Fixtures Replace with 20 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $142 $601 3.63 4.2 6 Exterior Door: West School Doors Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $88 $1,074 1.98 12.2 7*** HVAC And DHW Replace Burnout Motors with ECM motors $1,376 $10,430 1.81 7.6 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 8 Lighting: Type C Fixtures Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard (2) HighLight HighEfficElectronic and Add new Occupancy Sensor, Multi-Level Switch $561 $6,910 1.48 12.3 9**** Lighting: Type I Fixtures Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic and Add new Occupancy Sensor $9 $121 1.12 13.8 10 Lighting: Type J Fixtures Replace with 8 LED 50W Module StdElectronic $213 $3,000 1.09 14.1 11 HVAC And DHW Stack Economizer $859 $15,000 1.01 17.5 12***** Upgrade Controls Install DDC control system to control temp setbacks, outside air, and motor run time $2,109 $48,000 0.88 22.76 13 Exterior Door: East School Doors Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $15 $537 0.67 36.2 14 Exterior Door: School North Doors Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $88 $3,222 0.66 36.6 15 Window/Skylight: West, North, East Windows Replace existing window with triple pane, low-E, argon window. $319 $26,904 0.21 84.4 16 Window/Skylight: South Wall Windows Replace existing window with triple pane, low-E, argon window. $402 $36,236 0.20 90.1 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 17 Lighting: Type H Fixtures Replace with 3 LED 100W Module StdElectronic $143 $5,000 0.18 35.1 TOTAL $17,437 $166,584 1.12 9.5 Note: * Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and result in viable energy savings. ** The AkWarm results output here have been modified after processing to show that Improving the Manual Switching on the Heat Trace for Soffits cannot be completed without installing R-42 blown insulation to the Ceiling w/Attic that covers most of the school. *** This item is intended to be implemented as HVAC pumps burn out and require replacement. This is the cost difference between standard efficient motors and high efficiency Electronically Commutated Motors for all HVAC pumps. **** This item is intended to be implemented once the existing instant start ballasts fail and require replacement, negating the cost of installing new ballasts. ***** ECM item was modeled with separate AkWarm model and as a result, the item is not an additive measure and is not included in the final cost savings total. Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 Appendix E Site Visit Photos Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 1. Northeast Corner of School 2. Roof with Chimney Penetrations, Snow Fences 3. Generator Building Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 4. Boilers 5. Heating Circulation Pumps 6. AHU-1 7. AHU-2 8. AHU-3 9. MMU-1 Hope Elementary/High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-5HO-CAEC-01 10. Gym Lighting 11. End of Report