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CIRI-SXQ-CAEC Soldotna Sports Center 2012-EE
ENERGY AUDIT REPORT Soldotna Sports Center 538 Arena Avenue Soldotna, AK 99669 CAEC Project No. CIRI‐SXQ‐CAEC‐06 May 2012 SUBMITTED BY: PRIMARY CONTACT: 22010 SE 51st Street 32266 Lakefront Drive Issaquah, WA 98029 Soldotna, Alaska 99669 Phone (425)281‐4706 Fax (425)507‐4350 Phone (907) 260‐5311 Fax (907) 260‐5312 Email: andrew.waymire@siemens.com Email: akengineer@starband.net CONTACT: Andrew Waymire, C.E.M. CONTACT: Jerry P. Herring, P.E., C.E.A. 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. 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. 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. Siemens Industry, Inc (SII) 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. SII 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 3-10 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. Table of Contents REPORT DISCLAIMER.....................................................................................................................................2 1. EXECUTIVE SUMMARY..............................................................................................................................5 2. AUDIT AND ANALYSIS BACKGROUND.......................................................................................................9 3. Soldotna Sports Center...........................................................................................................................12 4. ENERGY COST SAVING MEASURES..........................................................................................................22 Appendix A – Major Equipment List ...........................................................................................................36 Appendix B – Lighting Inventory.................................................................................................................39 Appendix C – IR Photos / Heat Loss Signature............................................................................................40 Appendix D – REAL Utility Data...................................................................................................................41 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 5 of 47 1. EXECUTIVE SUMMARY This report was prepared for the City of Soldotna using ARRA funds as part of a contract for: City of Soldotna Alaska Housing Finance Corporation Contact: Kyle Kornelis Contact: Rebekah Luhrs 177 North Birch P.O. Box 10120 Soldotna, Alaska 99669 Anchorage, Alaska 99510 Phone (907) 262‐9107 Phone (907)330‐8141 Email: kkornelis@ci.soldotna.ak.us Email: rluhrs@ahfc.us The scope of the audit focused on Soldotna Sports Center. The scope of this report is a comprehensive energy study, which included an analysis of building shell, interior and exterior lighting systems, HVAC systems, and plug loads. Based on electricity and fuel oil prices in effect at the time of the audit, the annual predicted energy costs for the buildings analyzed are as follows: $129,383 for Electricity $36,673 for Natural Gas The total energy costs are $166,056 per year. Table 1.1 below summarizes the energy efficiency measures analyzed for the Soldotna Sports Center. Listed are the estimates of the annual savings, installed costs, and two different financial measures of investment return. Table 1.1 PRIORITY LIST – ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR1 Simple Payback (Years)2 1 Refrigeration: Ice System Replace with New DDC for Ice Refigeration System and Controls retrofit $5,803 $21,822 6.44 3.8 2 Lighting: Hallways Replace with 12 FLUOR CFL, Reflector 23W R25 $277 $328 5.36 1.2 3 Lighting: Hallways Replace with FLUOR T8 4' F32T8 32W Standard Instant StdElectronic $36 $92 4.69 2.6 4 Lighting: Exterior Replace with 25 120W Induction $3,972 $18,421 4.15 4.6 5 Lighting: Restrooms Add new Occupancy Sensor $578 $2,000 3.50 3.5 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 6 of 47 Table 1.1 PRIORITY LIST – ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR1 Simple Payback (Years)2 6 Lighting: Interior1 Replace with 18 FLUOR (4) T8 8' F96T8 59W Standard StdElectronic $1,096 $2,400 2.90 2.2 7 Ventilation ADD RA to AHU-2,3 plus DDC. Reduce run hours E- Fans $4,841 $27,346 2.26 5.6 8 Other Electrical Replace with 22 EXIT SIGNS $585 $3,300 2.14 5.6 9 Lighting: Hallways Replace with 3 FLUOR (3) T8 4' F32T8 32W Standard Instant StdElectronic $40 $357 1.34 9.0 10 Lighting: Hallways Replace with 27 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $277 $2,786 1.20 10.1 11 Lighting: Locker Rooms Replace with 63 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $577 $6,500 1.07 11.3 TOTAL, cost-effective measures $18,081 $85,350 3.66 4.7 The following measures were not found to be cost-effective: 12 Lighting: New Locker Room Add new Occupancy Sensor $76 $1,000 0.92 13.2 13 Lighting: Restrooms Replace with 15 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $116 $1,548 0.91 13.3 14 Lighting: Hallways Replace with 83 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $1,014 $16,600 0.74 16.4 15 Lighting: Gym Replace with 24 FLUOR (6) T8 4' F32T8 32W Standard Instant StdElectronic $248 $5,709 0.53 23.0 16 HVAC And DHW Add DDC to fans and boiler plant. Replace with two new high efficiency boilers. $7,423 $330,000 0.50 44.5 17 Lighting: Locker Rooms Add new Occupancy Sensor $401 $10,000 0.49 25.0 18 Lighting: Restrooms Replace with 85 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $540 $13,564 0.48 25.1 19 Lighting: Storage Replace with 31 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $82 $3,198 0.31 39.1 20 Lighting: Storage Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $8 $310 0.31 39.1 21 Lighting: Classrooms Replace with 60 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $309 $12,537 0.30 40.6 22 Lighting: Storage Replace with 3 FLUOR T8 4' F32T8 32W Standard Instant StdElectronic $6 $275 0.25 48.8 23 Lighting: Kitchen/Concessions Replace with 8 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $12 $825 0.18 68.8 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 7 of 47 Table 1.1 PRIORITY LIST – ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR1 Simple Payback (Years)2 24 Lighting: Kitchen/Concessions Replace with 11 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $16 $1,135 0.18 68.8 25 Lighting: Offices Replace with 18 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic -$94 $1,857 -0.62 999.9 TOTAL, all measures $28,236 $483,908 1.06 17.1 Table Notes: 1 Savings to Investment Ratio (SIR) is a life‐cycle cost measure calculated by dividing the total savings over the life of a project (expressed in today’s dollars) by its investment costs. The SIR is an indication of the profitability of a measure; the higher the SIR, the more profitable the project. An SIR greater than 1.0 indicates a cost‐effective project (i.e. more savings than cost). Remember that this profitability is based on the position of that Energy Efficiency Measure (EEM) in the overall list and assumes that the measures above it are implemented first. 2 Simple Payback (SP) is a measure of the length of time required for the savings from an EEM to payback the investment cost, not counting interest on the investment and any future changes in energy prices. It is calculated by dividing the investment cost by the expected first‐year savings of the EEM. With all of these energy efficiency measures in place, the annual utility cost can be reduced by $28,236 per year, or 17.0% of the buildings’ total energy costs. These measures are estimated to cost $483,908, for an overall simple payback period of 17.1 years. If only the cost‐effective measures are implemented, the annual utility cost can be reduced by $18,081 per year, or 10.9% of the buildings’ total energy costs. These measures are estimated to cost $85,350, for an overall simple payback period of 4.7 years. Table 1.2 below is a breakdown of the annual energy cost across various energy end use types, such as Space Heating and Water Heating. The first row in the table shows the breakdown for the building as it is now. The second row shows the expected breakdown of energy cost for the building assuming all of the retrofits in this report are implemented. Finally, the last row shows the annual energy savings that will be achieved from the retrofits. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 8 of 47 Table 1.2 Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrigera tion Other Electrical Cooking Clothes Drying Ventilatio n Fans Service Fees Total Cost Existing Building $50,49 5 $0 $725 $51,80 1 $37,049 $7,934 $0 $0 $14,941 $3,113 $166,056 With All Proposed Retrofits $41,01 6 $0 $0 $39,87 0 $31,545 $6,959 $0 $0 $15,317 $3,113 $137,820 SAVINGS $9,479 $0 $725 $11,93 1 $5,503 $975 $0 $0 ‐$377 $0 $28,236 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 9 of 47 2. AUDIT AND ANALYSIS BACKGROUND 2.1 Program Description This audit included services to identify, develop, and evaluate energy efficiency measures at the Soldotna Sports Center. The scope of this project included evaluating building shell, lighting and other electrical systems, and HVAC equipment, motors and pumps. Measures were analyzed based on life‐cycle‐cost techniques, which include the initial cost of the equipment, life of the equipment, annual energy cost, annual maintenance cost, and a discount rate of 3.0%/year in excess of general inflation. 2.2 Audit Description Preliminary audit information was gathered in preparation for the site survey. The site survey provides critical information in deciphering where energy is used and what opportunities exist within a building. The entire site was surveyed to inventory the following to gain an understanding of how each building operates: • Building envelope (roof, windows, etc.) • Heating, ventilation, and air conditioning equipment (HVAC) • Lighting systems and controls • Building‐specific equipment • Water consumption, treatment (optional) & disposal The building site visit was performed to survey all major building components and systems. The site visit included detailed inspection of energy consuming components. Summary of building occupancy schedules, operating and maintenance practices, and energy management programs provided by the building manager were collected along with the system and components to determine a more accurate impact on energy consumption. Details collected from Soldotna Sports Center enable a model of the building’s energy usage to be developed, highlighting the building’s total energy consumption, energy consumption by specific building component, and equivalent energy cost. The analysis involves distinguishing the different fuels used on site, and analyzing their consumption in different activity areas of the building. Soldotna Sports Center is classified as being made up of the following activity areas: 1) Soldotna Sports Center: 53,680 square feet Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 10 of 47 In addition, the methodology involves taking into account a wide range of factors specific to the building. These factors are used in the construction of the model of energy used. The factors include: • Occupancy hours • Local climate conditions • Prices paid for energy 2.3. Method of Analysis Data collected was processed using AkWarm© Energy Use Software to estimate energy savings for each of the proposed energy efficiency measures (EEMs). The recommendations focus on the building envelope; HVAC; lighting, plug load, and other electrical improvements; and motor and pump systems that will reduce annual energy consumption. EEMs are evaluated based on building use and processes, local climate conditions, building construction type, function, operational schedule, existing conditions, and foreseen future plans. Energy savings are calculated based on industry standard methods and engineering estimations. Our analysis provides a number of tools for assessing the cost effectiveness of various improvement options. These tools utilize Life‐Cycle Costing, which is defined in this context as a method of cost analysis that estimates the total cost of a project over the period of time that includes both the construction cost and ongoing maintenance and operating costs. Savings to Investment Ratio (SIR) = Savings divided by Investment Savings includes the total discounted dollar savings considered over the life of the improvement. When these savings are added up, changes in future fuel prices as projected by the Department of Energy are included. Future savings are discounted to the present to account for the time‐value of money (i.e. money’s ability to earn interest over time). The Investment in the SIR calculation includes the labor and materials required to install the measure. An SIR value of at least 1.0 indicates that the project is cost‐effective—total savings exceed the investment costs. Simple payback is a cost analysis method whereby the investment cost of a project is divided by the first year’s savings of the project to give the number of years required to recover the cost of the investment. This may be compared to the expected time before replacement of the system or component will be required. For example, if a boiler costs $12,000 and results in a savings of $1,000 in the first year, the payback time is 12 years. If the boiler has an expected life to replacement of 10 years, it would not be financially viable to make the investment since the payback period of 12 years is greater than the project life. The Simple Payback calculation does not consider likely increases in future annual savings due to energy price increases. As an offsetting simplification, simple payback does not consider the need to earn interest on the investment (i.e. it does not consider the time‐value of money). Because of these simplifications, the SIR figure is considered to be a better financial investment indicator than the Simple Payback measure. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 11 of 47 Measures are implemented in order of cost‐effectiveness. The program first calculates individual SIRs, and ranks all measures by SIR, higher SIRs at the top of the list. An individual measure must have an individual SIR>=1 to make the cut. Next the building is modified and re‐ simulated with the highest ranked measure included. Now all remaining measures are re‐ evaluated and ranked, and the next most cost‐effective measure is implemented. AkWarm goes through this iterative process until all appropriate measures have been evaluated and installed. It is important to note that the savings for each recommendation is calculated based on implementing the most cost effective measure first, and then cycling through the list to find the next most cost effective measure. Implementation of more than one EEM often affects the savings of other EEMs. The savings may in some cases be relatively higher if an individual EEM is implemented in lieu of multiple recommended EEMs. For example implementing a reduced operating schedule for inefficient lighting will result in relatively high savings. Implementing a reduced operating schedule for newly installed efficient lighting will result in lower relative savings, because the efficient lighting system uses less energy during each hour of operation. If multiple EEM’s are recommended to be implemented, AkWarm calculates the combined savings appropriately. Cost savings are calculated based on estimated initial costs for each measure. Installation costs include labor and equipment to estimate the full up‐front investment required to implement a change. Costs are derived from Means Cost Data, industry publications, and local contractors and equipment suppliers. 2.4 Limitations of Study All results are dependent on the quality of input data provided, and can only act as an approximation. In some instances, several methods may achieve the identified savings. This report is not intended as a final design document. The design professional or other persons following the recommendations shall accept responsibility and liability for the results. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 12 of 47 3. Soldotna Sports Center (Photo From Google Maps) 3.1. Building Description The 53,680 square foot Soldotna Sports Center was constructed in 1983. The number of hours of operation for this building average 7.7 hours per day, considering all seven days of the week. The number of hours of operation for this building average vary throughout the season The Soldotna Sports Center is home to multiple local hockey teams. The building consists of a main ice rink, pro shop, concessions, meeting rooms, multiple locker rooms and racquetball courts. Description of Building Shell The exterior walls are constructed of a strapped CMU walls with 3.5 inches of rigid insulation, 2x3 wood furring and an exterior wood panel face. The Roof of the building is constructed of a built up roof system with 5.5” metal studs, air spaces, 3.5 inches of rigid insulation, and water resistant gypsum board. The Floor/Foundation of the building is constructed slab concrete. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 13 of 47 Typical windows throughout the building are typically aluminum frames with double pane glass. Doors are full glass at the main entrance and metal on most side entrances. Garage doors exists at the back of the building. Description of Heating and Cooling Plants The Heating Plants used in the building are: Hot Water Boilers ‐ one primary Nameplate Information: Weil McLain Fuel Type: Natural Gas Input Rating: 2,793 BTU/hr Steady State Efficiency: 75 % Idle Loss: 1.5 % Heat Distribution Type: Water Boiler Operation: All Year Space Heating and Cooling Distribution Systems Main circulation and dedicated device booster pumps distribute hot water from the main boilers to terminal devices and to two (2) hot water‐to‐glycol heat exchangers. Glycol from these heat exchangers is then circulated to serve three (3) air handling units and other terminal devices. Heating distribution and ventilation is served in part by three (3) air handling units. AHU‐1 serves the main arena and staff reported that it is operated only during hockey games and large Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 14 of 47 events. AHU‐2 and AHU‐3 serve offices and locker rooms, respectively, and are operated by a time clock. Cabinet heaters and fin‐tube heating are used in many vestibules, offices and locker rooms. Domestic Hot Water System Domestic Hot water is served by and heat exchanger bundle that feeds off of the boiler hot water loop. Hot water is stored in a 1,000 gallon tank in the main boiler room. A 66 gallon domestic hot water heater located in a custodial closet on the second floor mezzanine was added to supply hot water to what is believed to be the concessions area and front restroom. Waste Heat Recovery Information No waste heat recovery systems exist. Description of Building Ventilation System The existing building ventilation needs are served by the building’s air handling units. Lighting Interior lighting typically consists of primarily of T12 linear fluorescent lamps with magnetic ballasts that are manually operated. The ice rink arena area was retrofitted twelve‐lamp, 4 foot T5 fixtures that are operated manually as needed. Exterior lights are typically metal halide lamps of varying wattages. The building also has numerous fluorescent and incandescent lamp exit signs. Plug Loads The building has a variety of plug loads. The office areas have typical loads from computers, printers and copiers. The concession stand and kitchen have numerous electrical loads from coffeemakers, refrigerators, food warms, and fryers. A chiller on the west side of the building uses glycol to chill the ice rink service and was revised in 1991. The chiller system contributes significantly to the overall building electrical consumption during the Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 15 of 47 hockey season between September and March. The system has a 935,000 BTH heat rejection capacity with 4 capacity stages that are operated manually. Major Equipment The equipment list, available in Appendix A, is composed of major energy consuming equipment which through energy conservation measures could yield substantial energy savings. The list shows the major equipment in the building and pertinent information utilized in energy savings calculations. 3.2 Predicted Energy Use 3.2.1 Energy Usage / Tariffs The electric usage profile charts (below) represents the predicted electrical usage for the building. If actual electricity usage records were available, the model used to predict usage was calibrated to approximately match actual usage. The electric utility measures consumption in kilowatt‐hours (kWh) and maximum demand in kilowatts (kW). One kWh usage is equivalent to 1,000 watts running for one hour. One KW of electric demand is equivalent to 1,000 watts running at a particular moment. The basic usage charges are shown as generation service and delivery charges along with several non‐utility generation charges. The natural gas usage profile shows the predicted natural gas energy usage for the building. If actual gas usage records were available, the model used to predict usage was calibrated to approximately match actual usage. Natural gas is sold to the customer in units of 100 cubic feet (CCF), which contains approximately 100,000 BTUs of energy. The propane usage profile shows the propane usage for the building. Propane is sold by the gallon or by the pound, and its energy value is approximately 91,800 BTUs per gallon. The fuel oil usage profile shows the fuel oil usage for the building. Fuel oil consumption is measured in gallons. One gallon of #1 Fuel Oil provides approximately 132,000 BTUs of energy. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 16 of 47 The following is a list of the utility companies providing energy to the building and the class of service provided: Electricity: Homer Electric Assn (Homer) ‐ Commercial ‐ Lg Natural Gas: Enstar Natural Gas ‐ Commercial ‐ Lg The average cost for each type of fuel used in this building is shown below in Table 3.1. This figure includes all surcharges, subsidies, and utility customer charges: Table 3.1 – Average Energy Cost Description Average Energy Cost Electricity $ 0.1357/kWh Natural Gas $ 0.71/ccf 3.2.1.1 Total Energy Use and Cost Breakdown At current rates, City of Soldotna pays approximately $166,056 annually for electricity and other fuel costs for the Soldotna Sports Center. Figure 3.1 below reflects the estimated distribution of costs across the primary end uses of energy based on the AkWarm© computer simulation. Comparing the “Retrofit” bar in the figure to the “Existing” bar shows the potential savings from implementing all of the energy efficiency measures shown in this report. Figure 3.1 Annual Energy Costs by End Use Figure 3.2 below shows how the annual energy cost of the building splits between the different fuels used by the building. The “Existing” bar shows the breakdown for the building as it is now; the Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 17 of 47 “Retrofit” bar shows the predicted costs if all of the energy efficiency measures in this report are implemented. Figure 3.2 Annual Energy Costs by Fuel Type Figure 3.3 below addresses only Space Heating costs. The figure shows how each heat loss component contributes to those costs; for example, the figure shows how much annual space heating cost is caused by the heat loss through the Walls/Doors. For each component, the space heating cost for the Existing building is shown (blue bar) and the space heating cost assuming all retrofits are implemented (yellow bar) are shown. Figure 3.3 Annual Space Heating Cost by Component $0 $10,000 $20,000 $30,000 $40,000 Floor Wall/Door Window Ceiling Air Existing Retrofit Annual Space Heating Cost by Component The tables below show AkWarm’s estimate of the monthly fuel use for each of the fuels used in the building. For each fuel, the fuel use is broken down across the energy end uses. Note, in the tables below “DHW” refers to Domestic Hot Water heating. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 18 of 47 Electrical Consumption (kWh) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Lighting 47142 42960 47142 13239 13258 12830 13258 13271 44542 47142 45621 47142 Other_Electrical 4441 4047 4441 4298 6235 6034 6235 6177 4298 4441 4298 4441 Refrigeration 33419 30454 33419 15092 0 0 0 0 64682 33419 32341 33419 Ventilation_Fans 9486 8644 9486 9180 9486 9180 9486 9486 9180 9486 9180 9486 DHW 0 0 0 0 0 0 0 0 0 0 0 0 Space_Heating 10069 9176 10069 9744 10069 9744 10069 10069 9744 10069 9744 10069 Space_Cooling 0 0 0 0 0 0 0 0 0 0 0 0 Natural Gas Consumption (ccf) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec DHW 89 81 89 86 89 86 89 89 86 89 86 89 Space_Heating 7346 5881 5734 5461 3885 2281 1503 1532 1048 3308 5194 7092 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 19 of 47 3.2.2 Energy Use Index (EUI) Energy Use Index (EUI) is a measure of a building’s annual energy utilization per square foot of building. This calculation is completed by converting all utility usage consumed by a building for one year, to British Thermal Units (Btu) or kBtu, 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 for similar building types. The Oak Ridge National Laboratory (ORNL) Buildings Technology Center under a contract with the U.S. Department of Energy maintains a Benchmarking Building Energy Performance Program. The ORNL website determines how a building’s energy use compares with similar facilities throughout the U.S. and in a specific region or state. Source use differs from site usage when comparing a building’s energy consumption with the national average. Site energy use is the energy consumed by the building at the building site only. Source energy use includes the site energy use as well as all of the losses to create and distribute the energy to the building. Source energy represents the total amount of raw fuel that is required to operate the building. It incorporates all transmission, delivery, and production losses, which allows for a complete assessment of energy efficiency in a building. The type of utility purchased has a substantial impact on the source energy use of a building. The EPA has determined that source energy is the most comparable unit for evaluation purposes and overall global impact. Both the site and source EUI ratings for the building are provided to understand and compare the differences in energy use. The site and source EUIs for this building are calculated as follows. (See Table 3.4 for details): Building Site EUI = (Electric Usage in kBtu + Gas Usage in kBtu + similar for other fuels) Building Square Footage Building Source EUI = (Electric Usage in kBtu X SS Ratio + Gas Usage in kBtu X SS Ratio + similar for other fuels) Building Square Footage where “SS Ratio” is the Source Energy to Site Energy ratio for the particular fuel. Table 3.4 Soldotna Sports Center EUI Calculations Energy Type Building Fuel Use per Year Site Energy Use per Year, kBTU Source/Site Ratio Source Energy Use per Year, kBTU Electricity 953,575 kWh 3,254,551 3.340 10,870,200 Natural Gas 51,315 ccf 5,131,487 1.047 5,372,667 Total 8,386,037 16,242,866 BUILDING AREA 53,680 Square Feet BUILDING SITE EUI 156 kBTU/Ft²/Yr BUILDING SOURCE EUI 303 kBTU/Ft²/Yr * Site ‐ Source Ratio data is provided by the Energy Star Performance Rating Methodology for Incorporating Source Energy Use document issued March 2011. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 20 of 47 3.3 AkWarm© Building Simulation An accurate model of the building performance can be created by simulating the thermal performance of the walls, roof, windows and floors of the building. The HVAC system and central plant are modeled as well, accounting for the outside air ventilation required by the building and the heat recovery equipment in place. The model uses local weather data and is trued up to historical energy use to ensure its accuracy. The model can be used now and in the future to measure the utility bill impact of all types of energy projects, including improving building insulation, modifying glazing, changing air handler schedules, increasing heat recovery, installing high efficiency boilers, using variable air volume air handlers, adjusting outside air ventilation and adding cogeneration systems. For the purposes of this study, the Soldotna Sports Center was modeled using AkWarm© energy use software to establish a baseline space heating and cooling energy usage. Climate data from Soldotna was used for analysis. From this, the model was be calibrated to predict the impact of theoretical energy savings measures. Once annual energy savings from a particular measure were predicted and the initial capital cost was estimated, payback scenarios were approximated. Equipment cost estimate calculations are provided in Appendix D. Limitations of AkWarm© Models • The model is based on typical mean year weather data for Soldotna. This data represents the average ambient weather profile as observed over approximately 30 years. As such, the gas and electric profiles generated will not likely compare perfectly with actual energy billing information from any single year. This is especially true for years with extreme warm or cold periods, or even years with unexpectedly moderate weather. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 21 of 47 Figure 3.4 Difference in Weather Data Soldotna, AK Weather Data -20 -10 0 10 20 30 40 50 60 70 80 12/3/2009 1/22/2010 3/13/2010 5/2/2010 6/21/2010 8/10/2010 9/29/2010 11/18/2010 1/7/2011 2/26/2011 DateDry Bulb Temperature (F)Actual Dry Bulb (F)TMY3 Dry Bulb (F) • The heating and cooling load model is a simple two‐zone model consisting of the building’s core interior spaces and the building’s perimeter spaces. This simplified approach loses accuracy for buildings that have large variations in cooling/heating loads across different parts of the building. • The model does not model HVAC systems that simultaneously provide both heating and cooling to the same building space (typically done as a means of providing temperature control in the space). The energy balances shown in Section 3.1 were derived from the output generated by the AkWarm© simulations. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 22 of 47 4. ENERGY COST SAVING MEASURES 4.1 Summary of Results The energy saving measures are summarized in Table 4.1. Please refer to the individual measure descriptions later in this report for more detail. Calculations and cost estimates for analyzed measures are provided in Appendix C. Table 4.1 Soldotna Sports Center, Soldotna, Alaska PRIORITY LIST – ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 1 Refrigeration: Ice System Replace with New DDC for Ice Refigeration System and Controls retrofit $5,803 $21,822 6.44 3.8 2 Lighting: Hallways Replace with 12 FLUOR CFL, Reflector 23W R25 $277 $328 5.36 1.2 3 Lighting: Hallways Replace with FLUOR T8 4' F32T8 32W Standard Instant StdElectronic $36 $92 4.69 2.6 4 Lighting: Exterior Replace with 25 120W Induction $3,972 $18,421 4.15 4.6 5 Lighting: Restrooms Add new Occupancy Sensor $578 $2,000 3.50 3.5 6 Lighting: Interior1 Replace with 18 FLUOR (4) T8 8' F96T8 59W Standard StdElectronic $1,096 $2,400 2.90 2.2 7 Ventilation ADD RA to AHU-2,3 plus DDC. Reduce run hours E- Fans $4,841 $27,346 2.26 5.6 8 Other Electrical Replace with 22 EXIT SIGNS $585 $3,300 2.14 5.6 9 Lighting: Hallways Replace with 3 FLUOR (3) T8 4' F32T8 32W Standard Instant StdElectronic $40 $357 1.34 9.0 10 Lighting: Hallways Replace with 27 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $277 $2,786 1.20 10.1 11 Lighting: Locker Rooms Replace with 63 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $577 $6,500 1.07 11.3 TOTAL, cost-effective measures $18,081 $85,350 3.66 4.7 The following measures were not found to be cost-effective: 12 Lighting: New Locker Room Add new Occupancy Sensor $76 $1,000 0.92 13.2 13 Lighting: Restrooms Replace with 15 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $116 $1,548 0.91 13.3 14 Lighting: Hallways Replace with 83 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $1,014 $16,600 0.74 16.4 15 Lighting: Gym Replace with 24 FLUOR (6) T8 4' F32T8 32W Standard Instant StdElectronic $248 $5,709 0.53 23.0 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 23 of 47 Table 4.1 Soldotna Sports Center, Soldotna, Alaska PRIORITY LIST – ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 16 HVAC And DHW Add DDC to fans and boiler plant. Replace with two new high efficiency boilers. $7,423 $330,000 0.50 44.5 17 Lighting: Locker Rooms Add new Occupancy Sensor $401 $10,000 0.49 25.0 18 Lighting: Restrooms Replace with 85 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $540 $13,564 0.48 25.1 19 Lighting: Storage Replace with 31 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $82 $3,198 0.31 39.1 20 Lighting: Storage Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $8 $310 0.31 39.1 21 Lighting: Classrooms Replace with 60 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $309 $12,537 0.30 40.6 22 Lighting: Storage Replace with 3 FLUOR T8 4' F32T8 32W Standard Instant StdElectronic $6 $275 0.25 48.8 23 Lighting: Kitchen/Concessions Replace with 8 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $12 $825 0.18 68.8 24 Lighting: Kitchen/Concessions Replace with 11 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $16 $1,135 0.18 68.8 25 Lighting: Offices Replace with 18 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic -$94 $1,857 -0.62 999.9 TOTAL, all measures $28,236 $483,908 1.06 17.1 4.2 Interactive Effects of Projects The savings for a particular measure are calculated assuming all recommended EEMs coming before that measure in the list are implemented. If some EEMs are not implemented, savings for the remaining EEMs will be affected. For example, if ceiling insulation is not added, then savings from a project to replace the heating system will be increased, because the heating system for the building supplies a larger load. In general, all projects are evaluated sequentially so energy savings associated with one EEM would not also be attributed to another EEM. By modeling the recommended project sequentially, the analysis accounts for interactive affects among the EEMs and does not “double count” savings. Interior lighting, plug loads, facility equipment, and occupants generate heat within the building. When the building is in cooling mode, these items contribute to the overall cooling demands of the building; therefore, lighting efficiency improvements will reduce cooling requirements in air‐conditioned buildings. Conversely, lighting‐efficiency improvements are anticipated to slightly increase heating requirements. Heating penalties and cooling benefits were included in the lighting project analysis. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 24 of 47 4.3 Building Shell Measures The building shell was in decent condition and no changes are recommended at this time. Building staff reported a Belzona protective roof coating had begun to peal. This should be monitored as continued degradation could compromise roof and wall insulation. Primarily Envelope Measures such as windows, doors, weather stripping, and insulation are only considered cost effective if there is a visible deficiency which is noted during the audit. However it is recommended that any time the facility replaces doors or windows that it uses a replacement with a high efficiency rating. Also when renovating or constructing additions to the facility a energy cost analysis should be taken when determining if a material with a greater R‐value should be used instead of that of the code requirements. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 25 of 47 4.4 Mechanical Equipment Measures 4.4.1 Heating/Cooling/Domestic Hot Water Measure Observation – Existing Boilers The existing boilers are old and inefficient. The boilers show signs of aging and their housings have begun to rust and decay. Recommendation Replacement of existing boilers with high efficiency boilers will reduce the fuel consumption for the buildings. The efficiency and operating life of a boiler is influenced by numerous factors. Boiler failure is typically a slow, progressive process that happens over a long period of time. Materials begin to fail with repeated thermal stress, boiler tubes gradually begin to leak, and scaling buildup prevents the boiler from meeting the heating load. When deciding whether to replace or repair an inefficient boiler, one should assess its overall condition and determine where losses are occurring. Combustion efficiency should be analyzed, since too much combustion air will decrease boiler efficiency. Scaling within the boiler tubes should also be investigated, since scaling decreases the overall heat transfer ability of the boiler. Benefits include: • More efficient boiler operation • Better boiler turndown • Lower operating costs • Greater comfort for building occupants Rank Recommendation 16 Add DDC to fans and boiler plant. Replace with two new high efficiency boilers. Installation Cost $330,000 Estimated Life of Measure (yrs)20 Energy Savings (/yr) $7,423 Breakeven Cost $165,126 Savings‐to‐Investment Ratio 0.5 Simple Payback yrs 44 Auditors Notes: High Efficiency Boiler Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 26 of 47 Observation – Controls The existing controls are mostly pneumatic. In general, the existing controls provide space level control. Day to day temperature fluctuations in the spaces can be a distraction to the occupants and the staff. Many of the buildings mechanical systems are operated manually. Recommendations Install a new direct digital control system be installed to provide automatic control to the air handling units, the boilers and radiant heating systems. The new system will improve the building engineer's ability to maintain comfort and enhance the learning environment in the classrooms. An Insight Workstation will be included to allow the Building Engineer access to this control system and its functions. Improvements will be made in response time and troubleshooting of occupant comfort problems. The following summarizes the potential capabilities and benefits of new building automation system. • Each air handling unit will have the following control sequences: economizer control, mixed air reset control, discharge air reset based on return air/space temperatures, optimal start/stop, night setback/morning warm‐up, IAQ monitoring of return air, demand ventilation control and alarming upon system failures. • The pumps and the boilers will be enabled and disabled based on the demand for heating. The operation of the pumps will be proofed and alarmed when failure occurs. In the heating plant, the boilers will be sequenced to maintain a hot water supply temperature reset by outside air temperature. • The Insight Workstation will be located in the boiler mechanical room. The operators will have the capability to monitor HVAC systems district wide. At the Insight Workstation, the operator will be able to input the building operating schedule and specific after hours functions, specific holidays and days when classes end early. • Logging, recording, run time tracking and trending operation of equipment. • The optimal start/stop and scheduling programming will be incorporated into all the systems. These schedules will be software adjustable so that the engineer can adjust the schedule to the changing needs of the building through the central operator station. • This system will be equipped for remote communication for ease of trouble shooting and system monitoring by the staff during the day as well as after hours. 4.4.2 Ventilation System Measures Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 27 of 47 Observation – Ventilation Systems Many of the areas served by AHU‐2 and AHU‐3 are being over exhausted with little overall exhaust air control. This means that both AHUs must bring in and temper more outside air in order to meet building temperature set points. Recommendation Rebalance the areas served by AHU‐2 and AHU‐3 in order to bring more return air to the air handling units. Installing better exhaust fan controls and possibly tying them back to a DDC system can further save energy by minimizing the need for outside air. Some of the areas served by the AHUs are locker rooms and the ventilation needs of such areas would have to be considered. One EEM that is typically recommended in an area such as a large gymnasium or ice rink is demand control ventilation (DCV). DCV modulates the amount of outdoor air intake based CO2 sensors that estimate the area’s occupancy. Because AHU‐1, which serves the ice rink, is manually operated based on the area’s occupancy, DCV is not recommended at this time. If a DDC system is installed to control AHUs, DCV in the ice rink may be an option. Rank Description Recommendation 7 ADD RA to AHU‐2,3 plus DDC. Reduce run hours E‐Fans Installation Cost $27,346 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $4,841 Breakeven Cost $61,782 Savings‐to‐Investment Ratio 2.3 Simple Payback yrs 6 Auditors Notes: Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 28 of 47 4.4.3 Piping Insulation Upgrade Observations Various existing hot water HVAC and domestic hot water piping and valve systems are currently un‐ insulated or have damaged insulation systems. This is especially the case in the piping leading into or coming out of the glycol heat exchanger. These un‐insulated systems are continuously losing heat and energy to the mechanical room space, reducing the deliverable capacity to the designed end use devices. This energy waste reduces the overall system efficiency, unnecessarily increases the mechanical room ambient temperature and creates potential employee safety hazards due to exposed high temperature surfaces. Recommendations Install or reinstall glass fiber pipe insulation on specified HVAC and domestic hot water piping systems. Through walkthroughs, the following preliminary list of piping lengths and sizes were identified as needing new insulation. Convertor Room Missing insulation Pipe Diameter Feet 2-1/2" Glycol HWS 25 2-1/2" Glycol HWS 20 2-1/2" Glycol HWR 30 2-1/2" Glycol HWR 28 3" Boiler HWS 15 3" Boiler HWR 12 4" Boiler HWR 4 Boiler Room Missing insulation Pipe Diameter Feet 4" Heating HWS 10 3" Heating HWR 10 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 29 of 47 4.5 Electrical & Appliance Measures 4.5.1 Lighting Measures The goal of this section is to present any lighting energy conservation measures that may also be cost beneficial. It should be noted that replacing current bulbs with more energy‐efficient equivalents will have a small effect on the building heating and cooling loads. The building cooling load will see a small decrease from an upgrade to more efficient bulbs and the heating load will see a small increase, as the more energy efficient bulbs give off less heat. 4.5.1a Lighting Measures – Replace Existing Fixtures/Bulbs Observations Most areas of the Soldotna Sports Center have inefficient 34W T12 lamps with magnetic ballasts. Many of the lights in the locker rooms are left on during unoccupied times. Exterior building and parking lot lighting consists of metals halide fixtures of varying wattages. Recommendations Replace lower efficiency fluorescent lamps and magnetic ballasts with second generation T‐8 fluorescent lamps and electronic ballasts. T‐12 and T‐8 lamps fit into the same size sockets, so some of the existing fixtures can be easily retrofitted with the latest lamp and ballast technologies. In areas with old and inefficient fixtures, Siemens will replace the fixture with a new, efficient and aesthetically pleasing fixture. Electronic ballasts use less energy and reduce flicker, glare, noise, and heat output. Older T12 magnetic ballasts may also contain PCB’s that cannot be disposed of in ordinary waste streams. The proper disposal of these PCB ballast is a maintenance cost that is eliminated when fixtures are retrofitted with new electronic ballast. Install occupancy sensors in locker rooms in order to minimize the use of lighting during unoccupied times. It is also recommended that the existing exterior metal halide fixtures be replaced with more energy efficient and longer lasting induction lighting fixtures. Rank Location Existing Condition Recommendation 25 Offices 18 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 18 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $1,857 Estimated Life of Measure (yrs)15 Energy Savings (/yr) ‐$94 Breakeven Cost ‐$1,145 Savings‐to‐Investment Ratio ‐0.6 Simple Payback yrs 1000 Auditors Notes: $103.17/fix Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 30 of 47 Rank Location Existing Condition Recommendation 24 Kitchen/Concessions 11 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 11 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $1,135 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $16 Breakeven Cost $200 Savings‐to‐Investment Ratio 0.2 Simple Payback yrs 69 Auditors Notes: Rank Location Existing Condition Recommendation 23 Kitchen/Concessions 8 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 8 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $825 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $12 Breakeven Cost $146 Savings‐to‐Investment Ratio 0.2 Simple Payback yrs 69 Auditors Notes: $103.17/fix Rank Location Existing Condition Recommendation 22 Storage 3 FLUOR T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 3 FLUOR T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $275 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $6 Breakeven Cost $69 Savings‐to‐Investment Ratio 0.3 Simple Payback yrs 49 Auditors Notes: $91.51/fix Rank Location Existing Condition Recommendation 21 Classrooms 60 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 60 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $12,537 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $309 Breakeven Cost $3,766 Savings‐to‐Investment Ratio 0.3 Simple Payback yrs 41 Auditors Notes: $103.17/fix Rank Location Existing Condition Recommendation 20 Storage 3 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $310 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $8 Breakeven Cost $97 Savings‐to‐Investment Ratio 0.3 Simple Payback yrs 39 Auditors Notes: $103.17/fix Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 31 of 47 Rank Location Existing Condition Recommendation 19 Storage 31 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 31 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $3,198 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $82 Breakeven Cost $1,003 Savings‐to‐Investment Ratio 0.3 Simple Payback yrs 39 Auditors Notes: $103.17/fix Rank Location Existing Condition Recommendation 18 Restrooms 85 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 85 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $13,564 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $540 Breakeven Cost $6,567 Savings‐to‐Investment Ratio 0.5 Simple Payback yrs 25 Auditors Notes: $103.17/fix ~4 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 17 Locker Rooms 63 FLUOR (2) T12 4' F40T12 34W Energy‐Saver EfficMagnetic with Manual Switching Add new Occupancy Sensor Installation Cost $10,000 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $401 Breakeven Cost $4,864 Savings‐to‐Investment Ratio 0.5 Simple Payback yrs 25 Auditors Notes: 103.17/fix ~20 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 15 Gym 24 FLUOR (6) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 24 FLUOR (6) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $5,709 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $248 Breakeven Cost $3,009 Savings‐to‐Investment Ratio 0.5 Simple Payback yrs 23 Auditors Notes: 2*118.94 = $237.88 Rank Location Existing Condition Recommendation 14 Hallways 83 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 83 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $16,600 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $1,014 Breakeven Cost $12,247 Savings‐to‐Investment Ratio 0.7 Simple Payback yrs 16 Auditors Notes: $103.17/fix Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 32 of 47 Rank Location Existing Condition Recommendation 13 Restrooms 15 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 15 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $1,548 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $116 Breakeven Cost $1,409 Savings‐to‐Investment Ratio 0.9 Simple Payback yrs 13 Auditors Notes: $103.17/fix Rank Location Existing Condition Recommendation 12 New Locker Room 8 FLUOR (4) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $1,000 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $76 Breakeven Cost $919 Savings‐to‐Investment Ratio 0.9 Simple Payback yrs 13 Auditors Notes: ~2 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 11 Locker Rooms 63 FLUOR (2) T12 4' F40T12 34W Energy‐Saver EfficMagnetic with Manual Switching Replace with 63 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $6,500 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $577 Breakeven Cost $6,984 Savings‐to‐Investment Ratio 1.1 Simple Payback yrs 11 Auditors Notes: 103.17/fix ~20 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 10 Hallways 27 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 27 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $2,786 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $277 Breakeven Cost $3,346 Savings‐to‐Investment Ratio 1.2 Simple Payback yrs 10 Auditors Notes: $103.17/fix Rank Location Existing Condition Recommendation 9 Hallways 3 FLUOR (3) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Replace with 3 FLUOR (3) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $357 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $40 Breakeven Cost $479 Savings‐to‐Investment Ratio 1.3 Simple Payback yrs 9 Auditors Notes: $118.94/fix Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 33 of 47 4.5.1b Lighting Measures – Lighting Controls (There were no improvements in this category) Rank Location Existing Condition Recommendation 6 Interior1 18 MH 400 Watt StdElectronic with Manual Switching Replace with 18 FLUOR (4) T8 8' F96T8 59W Standard StdElectronic Installation Cost $2,400 Estimated Life of Measure (yrs)7 Energy Savings (/yr) $1,096 Breakeven Cost $6,949 Savings‐to‐Investment Ratio 2.9 Simple Payback yrs 2 Auditors Notes: Rank Location Existing Condition Recommendation 5 Restrooms 85 FLUOR (2) T12 4' F40T12 34W Energy‐Saver Magnetic with Manual Switching Add new Occupancy Sensor Installation Cost $2,000 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $578 Breakeven Cost $6,996 Savings‐to‐Investment Ratio 3.5 Simple Payback yrs 3 Auditors Notes: $103.17/fix ~4 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 4 Exterior 25 MH 250 Watt StdElectronic Replace with 25 120W Induction Installation Cost $18,421 Estimated Life of Measure (yrs)27 Energy Savings (/yr) $3,972 Breakeven Cost $76,418 Savings‐to‐Investment Ratio 4.1 Simple Payback yrs 5 Auditors Notes: $736.84/fix Rank Location Existing Condition Recommendation 3 Hallways 1 FLUOR T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with FLUOR T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $92 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $36 Breakeven Cost $430 Savings‐to‐Investment Ratio 4.7 Simple Payback yrs 3 Auditors Notes: $91.51/fix Rank Location Existing Condition Recommendation 2 Hallways 12 INCAN A Lamp, Halogen 75W with Manual Switching Replace with 12 FLUOR CFL, Reflector 23W R25 Installation Cost $328 Estimated Life of Measure (yrs)7 Energy Savings (/yr) $277 Breakeven Cost $1,755 Savings‐to‐Investment Ratio 5.4 Simple Payback yrs 1 Auditors Notes: $27.30/fix Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 34 of 47 4.5.2 Refrigeration Measures Observations The existing chiller control system for the ice rink an inoperable DDC system that does not allow for load control and is manually operated. Some of the existing DDC wiring have been disconnected and cut. Recommendations It is recommended that a new DDC control system be installed to better match system operation with the loads of the system. Installation of sensors to control energy expenditure by the system based on demand is recommended. A controller can be used to slow the evaporator fans when full‐speed operation is not required. The controller does this by applying a lower voltage to the fan motor, producing less rotational force. Rank Location Description of Existing Efficiency Recommendation 1 Ice System Site Built / York open drive compressors with Seasonal Shutdown Replace with New DDC for Ice Refigeration System and Controls retrofit Installation Cost $21,822 Estimated Life of Measure (yrs)25 Energy Savings (/yr) $5,803 Breakeven Cost $140,434 Savings‐to‐Investment Ratio 6.4 Simple Payback yrs 4 Auditors Notes: Replace old DDC that is no longer operational. Found wiring cut. No compressor load control. Cylinder unloaders operated by manual toggle switch. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 35 of 47 4.5.3 Other Electrical Measures Observations Numerous exit sign light fixtures utilizing fluorescent and incandescent technology still exist in the building. Recommendation Retrofit or replace the remaining exit signs with new LED lighting technology exit signs. 4.5.4 Cooking Measures (There were no improvements in this category) 4.5.5 Clothes Drying Measures (There were no improvements in this category) Rank Location Description of Existing Efficiency Recommendation 8 22 EXIT SIGNS Replace with 22 EXIT SIGNS Installation Cost $3,300 Estimated Life of Measure (yrs)15 Energy Savings (/yr) $585 Breakeven Cost $7,061 Savings‐to‐Investment Ratio 2.1 Simple Payback yrs 6 Auditors Notes: ~$150/fixture Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 36 of 47 Appendix A – Major Equipment List Boilers Boiler Make Model MBH in MBH out Blower HP B-1A Weil-McLain 8L-1186-SV 2,793 2,260 2 B-1B Weil-McLain 8L-1186-SV 2,793 2,260 2 DHW Heaters Make Model Gal Cap Pump Location Serves Main Unit 1000 gallon DHW tank with internal Heat Exchanger 100 0 710W Boiler Room Zamboni Machine, Locker Rooms Additional Unit State PGGG20RTG 66 4500W /4500W 2nd Floor Mezzanine Front Restrooms AHUs AHUs CFM HP Clg MBH Htg MBH Pre Ht Serves AHU-1 60,000 50 942.3 2160 Main Arena, Runs Sparingly AHU-2 15,360 15 273.4 330.5 Racquetball and Offices, On Timer AHU-3 4,700 3 253.8 253.8 Locker Rooms Return Fans Ret/Exh Fan CFM HP REF-1 60,000 20 REF-2A 4,620 1 REF-2B 9,420 3 Terminal Fan Units TFU CFM HP MBH TFU-1 3,260 (2) 3/4HP 88 TFU-2 930 0.25 20.5 TFU-3 995 0.25 11.6 Exhaust Fans Exhaust Fan CFM HP EF-1 4,665 2 EF-2 175 0.02 EF-3 240 0.1 EF-4 840 0.25 EF-5 1,200 0.25 EF-6 1,050 0.33 EF-7 120 0.02 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 37 of 47 Ventilation Fans Ventilation Fan CFM HP VF-1 1,900 0.25 VF-2 1,980 0.25 VF-3 600 0.25 VF-4 300 0.02 Circulation Pumps Circ. Pumps HP GPM Head (ft) Serves CHWP-1 3 135.5 46 not used -optional CP-1A 3 142 47 Main HWP CP-1B 3 142 47 Main HWP CP-2 2 220 20 HE-1 CP-3 2 122 24 AHU-1 CP-4 0.33 19 21 AHU-2 CP-5 0.33 15 20 AHU-3 CP-6 0.33 15 20 AHU-4 CP-7 0.05 2 8 DHW CP-8 188 16HE-2 Unit Heaters Unit Heater MBH max GPM min CFM HP UH-1 9 1.25 500 0.05 UH-2 10.5 1.5 500 0.05 UH-3 9 1.25 500 0.05 UH-4 7.5 1 500 0.05 UH-5 9 1.25 500 0.05 UH-6 6 1 500 0.05 UH-7 7.5 1 500 0.05 UH-8 7 1 500 0.05 UH-9 14 2 500 0.05 UH-10 7 1 500 0.05 UH-11 5 1 500 0.05 UH-12 5 1 500 0.05 Fan Coil Units Fan Coil Units Quantity CFM HP MBH FCU-1 thru 6 6 2,600 0.75 139.2 FCU-7 thru 8 2 3,200 1 172.8 FCU-9 & 12 2 1,080 0.33 19.4 FCU-10 & 11 2 1,020 0.33 18.4 FCU-13 1 650 0.25 11.7 FCU-14 1 750 0.25 16.9 FCU-15 1 600 0.17 32.4 FCU-16 1 740 0.25 20 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 38 of 47 Cabinet Unit Heaters Cab Unit Heaters MBH max GPM Min CFM HP CUH-1 4.5 1 200 0.02 CUH-2 7 1 200 0.02 CUH-3 3 1 200 0.02 CUH-4 5 1 200 0.02 CUH-5 10.5 1.5 200 0.02 CUH-6 10.5 1.5 200 0.02 CUH-7 21 3 300 0.03 CUH-8 10.5 1.5 200 0.02 Ice Systems Motors HP V A ph % Eff Make Comp-1 100 460 118 3 92% Marathon Comp-2 100 460 118 3 92% Marathon Glycol-1 /VFD 30 460 68 3 91% Magnetic Glycol-2 /VFD 30 460 68 3 91% Magnetic Glycol-3 / not used 7.5 460 3 91% Magnetic VFD controlled by sensor in ice also sequences pumps Misc. Pumps Make HP V GPM TDH % Eff Glycol -Under Floor Paco 2 460 125 40 86% Glycol - Zamboni Ice Melt 1 460 50 35 85% Condensers Make HP Voltage # of Fans Ph % Eff Main Condenser Russell Condenser 2 460 12 3 82 Compressors Model Refrigerant A Tons Comp-1 York Open Drive R-22 RS 84A 60 ton Comp-2 York Open Drive R-22 RS 84A 60 ton 935,000 btu/hr heat rejection capacity (note from onsite documentation) - Compressors have 4 capacity stages. - Automated staging removed when plant revised in 1991. Staging is NOW manual. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 39 of 47 Appendix B – Lighting Inventory 12 Lamp T5 Fixture 1x2x2 T12 1x4x1 T12 1x4x2 T12 (34W) 2 x 20W Exit Signs 250 W MH 2x4x2 T12 (34W) 2x4x2 T5 2x4x3 T12 (34W) 2x4x4 T8 2x4x6 T12 75 W Incandescent Grand Total Classroom 60 60 Exterior 25 25 Racquetball 24 24 Hallways 2 83 27 3 12 127 Ice Rink 50 50 Kitchen 11 8 19 Offices 18 5 23 Restrooms/ Lockers 85 15 8 108 Storage 3 31 3 37 Exit Signs 22 22 Grand Total 50 2 3 210 22 25 131 5 3 8 24 12 495 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 40 of 47 Appendix C – IR Photos / Heat Loss Signature There is some heat loss around exterior doors.. Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 41 of 47 Appendix D – REAL Utility Data First Name Last Name Middle Name Phone Kyle Kornelis 262‐9107 State Zip AK 99669 Monday‐ Friday Saturday Sunday Holidays 8am‐12am 8am‐12am 8am‐12am 8am‐12am Average # of Occupants During Up to 1000 Up to 1000 Up to 1000 Up to 1000 Renovations Date 1990 PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton xx Other energy sources? City of Soldotna Municipal 03/09/11 REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner Facility Owned By Date Building Name/ Identifier Building Usage Building Square Footage Soldotna Sports Arena Other 53,680 Building Type Community Population Year Built Steel 4,021 1983 Facility Address Facility City Facility Zip 538 Arena Avenue Soldotna 99669 Contact Person Email kkornelis@ci.soldotna.ak.us Mailing Address City 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. 2. Provide utilities bills for the most recent two‐year period for each energy source you use. Soldotna Details 177 N. Birch None Primary Operating Hours Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 42 of 47 Soldotna Sports Arena Buiding Size Input (sf) =53,680 2009 Natural Gas Consumption (Therms)54,311 2009 Natural Gas Cost ($)65,565 2009 Electric Consumption (kWh)936,640 2009 Electric Cost ($)175,149 2009 Oil Consumption (Therms) 2009 Oil Cost ($) 2009 Propane Consumption (Therms) 2009 Propane Cost ($) 2009 Coal Consumption (Therms) 2009 Coal Cost ($) 2009 Wood Consumption (Therms) 2009 Wood Cost ($) 2009 Thermal Consumption (Therms) 2009 Thermal Cost ($) 2009 Steam Consumption (Therms) 2009 Steam Cost ($) 2009 Total Energy Use (kBtu)8,627,852 2009 Total Energy Cost ($)240,714 Annual Energy Use Intensity (EUI) 2009 Natural Gas (kBtu/sf) 101.2 2009 Electricity (kBtu/sf)59.6 2009 Oil (kBtu/sf) 2009 Propane (kBtu/sf) 2009 Coal (kBtu/sf) 2009 Wood (kBtu/sf) 2009 Thermal (kBtu/sf) 2009 Steam (kBtu/sf) 2009 Energy Utilization Index (kBtu/sf)160.7 Annual Energy Cost Index (ECI) 2009 Natural Gas Cost Index ($/sf)1.22 2009 Electric Cost Index ($/sf)3.26 2009 Oil Cost Index ($/sf) 2009 Propane Cost Index ($/sf) 2009 Coal Cost Index ($/sf) 2009 Wood Cost Index ($/sf) 2009 Thermal Cost Index ($/sf) 2009 Steam Cost Index ($/sf) 2009 Energy Cost Index ($/sf)4.48 Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 43 of 47 2010 Natural Gas Consumption (Therms)51,613 2010 Natural Gas Cost ($)43,518 2010 Electric Consumption (kWh)984,600 2010 Electric Cost ($)140,097 2010 Oil Consumption (Therms) 2010 Oil Cost ($) 2010 Propane Consumption (Therms) 2010 Propane Cost ($) 2010 Coal Consumption (Therms) 2010 Coal Cost ($) 2010 Wood Consumption (Therms) 2010 Wood Cost ($) 2010 Thermal Consumption (Therms) 2010 Thermal Cost ($) 2010 Steam Consumption (Therms) 2010 Steam Cost ($) 2010 Total Energy Use (kBtu)8,521,740 2010 Total Energy Cost ($)183,615 Annual Energy Use Intensity (EUI) 2010 Natural Gas (kBtu/sf)96.1 2010 Electricity (kBtu/sf)62.6 2010 Oil (kBtu/sf) 2010 Propane (kBtu/sf) 2010 Coal (kBtu/sf) 2010 Wood (kBtu/sf) 2010 Thermal (kBtu/sf) 2010 Steam (kBtu/sf) 2010 Energy Utilization Index (kBtu/sf)158.8 Annual Energy Cost Index (ECI) 2010 Natural Gas Cost Index ($/sf)0.81 2010 Electric Cost Index ($/sf)2.61 2010 Oil Cost Index ($/sf) 2010 Propane Cost Index ($/sf) 2010 Coal Cost Index ($/sf) 2010 Wood Cost Index ($/sf) 2010 Thermal Cost Index ($/sf) 2010 Steam Cost Index ($/sf) 20010 Energy Cost Index ($/sf)3.42 Note: 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 44 of 47 Soldotna Sports ArenaNatural GasBtus/CCF =100,000Provider Customer #Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC260 Dec‐08 12/9/2008 1/7/2009 28 7,190 7,190 $12,121 $1.69Enstar NGC260 Jan‐09 1/7/2009 2/9/2009 32 7,754 7,754 $7,791 $1.00Enstar NGC260 Feb‐09 2/9/2009 3/10/2009 31 5,928 5,928 $6,005 $1.01Enstar NGC260 Mar‐09 3/10/2009 4/7/2009 27 4,983 4,983 $5,058 $1.02Enstar NGC260 Apr‐09 4/7/2009 5/11/2009 34 3,190 3,190 $3,261 $1.02Enstar NGC260 May‐09 5/11/2009 6/8/2009 27 839 839 $4,197 $5.00Enstar NGC260 Jun‐09 6/8/2009 7/9/2009 31 1,219 1,219 $2,233 $1.83Enstar NGC260 Jul‐09 7/9/2009 8/6/2009 27 1,130 1,130 $2,498 $2.21Enstar NGC260 Aug‐09 8/6/2009 9/9/2009 33 4,721 4,721 $4,800 $1.02Enstar NGC260 Sep‐09 9/9/2009 10/9/2009 30 5,031 5,031 $5,110 $1.02Enstar NGC260 Oct‐09 10/9/2009 11/10/2009 31 5,999 5,999 $6,081 $1.01Enstar NGC260 Nov‐09 11/10/2009 12/7/2009 276,3276,327$6,410$1.01Enstar NGC260 Dec‐09 12/7/2009 1/7/2010307,3337,333$6,131$0.84Enstar NGC260 Jan‐10 1/7/2010 2/8/2010318,0908,090$6,813$0.84Enstar NGC260 Feb‐10 2/8/2010 3/10/2010 327,0107,010$5,863$0.84Enstar NGC260 Mar‐10 3/10/2010 4/7/2010275,7735,773$4,887$0.85Enstar NGC260 Apr‐10 4/7/2010 5/7/2010304,6954,695$3,987$0.85Enstar NGC260 May‐10 5/7/2010 6/10/2010 331,4811,481$1,304$0.88Enstar NGC260 Jun‐10 6/10/2010 7/8/2010281,1251,125$1,007$0.90Enstar NGC260 Jul‐10 7/8/2010 8/11/2010 33762762$971$1.27Enstar NGC260 Aug‐10 8/11/2010 9/9/201028765765$973$1.27Enstar NGC260 Sep‐10 9/9/2010 10/12/2010 333,5423,542$3,195$0.90Enstar NGC260 Oct‐10 10/12/2010 11/10/2010 284,5484,548$2,835$0.62Enstar NGC260 Nov‐10 11/10/2010 12/7/2010 276,4896,489$5,552$0.86Dec ‐ 08 to Nov ‐ 09 total:54,31154,3110$65,565$0Dec ‐ 09 to Nov ‐ 10 total:51,61351,6130$43,518$0$1.57$0.91Dec ‐ 08 to Nov ‐ 09 avg:Dec ‐ 09 to Nov ‐ 10 avg: Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 45 of 47 Soldotna Sports Arena ‐ Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)05001000150020002500300035004000Jan‐09Feb‐09Mar‐09Apr‐09May‐09Jun‐09Jul‐09Aug‐09Sep‐09Oct‐09Nov‐09Dec‐09Jan‐10Feb‐10Mar‐10Apr‐10May‐10Jun‐10Jul‐10Aug‐10Sep‐10Oct‐10Nov‐10Dec‐10Date (Mon ‐ Yr)Natural Gas Consumption (Therms)05001000150020002500300035004000Natural Gas Cost ($)Natural Gas Consumption(Therms)Natural Gas Cost ($) Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 46 of 47 Soldotna Sports ArenaElectricityBtus/kWh =3,413Provider Customer #Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)HEA 2002777 Jan‐09 12/16/2008 1/19/2009 33 106,080 3,621260$21,387$0.20HEA 2002777 Feb‐09 1/19/2009 2/18/2009 29102,7203,506294$21,042$0.20HEA 2002777 Mar‐09 2/18/2009 3/17/2009 2986,3202,946273$17,890$0.21HEA 2002777 Apr‐09 3/17/2009 4/14/2009 2775,8402,588277$13,012$0.17HEA 2002777 May‐09 4/14/2009 5/15/2009 3132,8801,122157$15,978$0.49HEA 2002777 Jun‐09 5/15/2009 6/17/2009 3241,6801,423257$7,967$0.19HEA 2002777 Jul‐09 6/17/2009 7/16/2009 2938,3201,30827$7,615$0.20HEA 2002777 Aug‐09 7/16/2009 8/17/2009 3157,3601,958263$10,392$0.18HEA 2002777 Sep‐09 8/17/2009 9/16/2009 2990,2403,080273$15,268$0.17HEA 2002777 Oct‐09 9/16/2009 10/16/2009 3094,8003,236301$14,000$0.15HEA 2002777 Nov‐09 10/16/2009 11/16/2009 30106,1603,623305$15,434$0.15HEA 2002777 Dec‐09 11/16/2009 12/15/2009 29104,2403,558301$15,164$0.15HEA 2002777 Jan‐10 12/15/2009 1/18/2010 33111,9203,820296$14,079$0.13HEA 2002777 Feb‐10 1/18/2010 2/18/2010 30107,9203,683297$13,667$0.13HEA 2002777 Mar‐10 2/18/2010 3/16/2010 28108,3203,697321$13,879$0.13HEA 2002777 Apr‐10 3/16/2010 4/14/2010 28119,7604,087286$17,451$0.15HEA 2002777 May‐10 4/14/2010 5/13/2010 2950,0001,707274$8,547$0.17HEA 2002777 Jun‐10 5/13/2010 6/16/2010 3339,4401,346242$6,966$0.18HEA 2002777 Jul‐10 6/16/2010 7/16/2010 3052,3201,786244$8,701$0.17HEA 2002777 Aug‐10 7/16/2010 8/16/2010 3029,5601,00963$3,721$0.13HEA 2002777 Sep‐10 8/16/2010 9/15/2010 2927,600942257$5,632$0.20HEA 2002777 Oct‐10 9/15/2010 10/15/2010 30131,9204,502267$17,953$0.14HEA 2002777 Nov‐10 10/15/2010 11/16/2010 31103,3603,528287$14,694$0.14HEA 2002777 Dec‐10 11/16/2010 12/15/2010 29102,4803,498315$14,807$0.14Jan ‐ 09 to Dec ‐ 09 total:936,64031,9682,987 $175,149$0Jan ‐ 10 to Dec ‐ 10 total:984,60033,6043,148 $140,097$0$0.20$0.15Jan ‐ 10 to Dec ‐ 10 avg:Jan ‐ 09 to Dec ‐ 09 avg: Siemens Industry, Inc. Soldotna Sports Center Energy Audit Report AkWarm ID No. CIRI‐SXQ‐CAEC‐06 Page 47 of 47 Soldotna Sports Arena ‐ Electric Consumption (kWh) vs. Electric Cost ($)020000400006000080000100000120000140000160000180000200000Jan‐09Feb‐09Mar‐09Apr‐09May‐09Jun‐09Jul‐09Aug‐09Sep‐09Oct‐09Nov‐09Dec‐09Jan‐10Feb‐10Mar‐10Apr‐10May‐10Jun‐10Jul‐10Aug‐10Sep‐10Oct‐10Nov‐10Dec‐10Date (Mon ‐ Yr)Electric Consumption (kWh)05000100001500020000250003000035000Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)