ENERGY AUDIT REPORT. Soldotna High School 425 W. Marydale Ave. Soldotna, AK 99669

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1 ENERGY AUDIT REPORT Soldotna High School 425 W. Marydale Ave. Soldotna, AK CAEC Project No. CIRI SXQ CAEC 11 May 2012 SUBMITTED BY: PRIMARY CONTACT: SE 51 st Street Lakefront Drive Issaquah, WA Soldotna, Alaska Phone (425) Fax (425) Phone (907) Fax (907) CONTACT: Andrew Waymire, C.E.M. CONTACT: Jerry P. Herring, P.E., C.E.A.

2 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- EE 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.

3 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.

4 Table of Contents REPORT DISCLAIMER EXECUTIVE SUMMARY AUDIT AND ANALYSIS BACKGROUND Soldotna High School ENERGY COST SAVING MEASURES...22 Appendix A Major Equipment List...37 Appendix B Lighting Inventory...39 Appendix C IR Photos...40 Appendix D Utility Data...41

5 1. EXECUTIVE SUMMARY This report was prepared for the Kenai Peninsula School District using ARRA funds as part of a contract for: Kenai Peninsula Borough Contact: Kevin Lyon East Poppy Lane P.O. Box Soldotna, Alaska Anchorage, Alaska Alaska Housing Finance Corporation Contact: Rebekah Luhrs Phone (907) Phone (907) klyon@borough.kenai.ak.us rluhrs@ahfc.us The scope of the audit focused on Soldotna High School. 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: $190,660 for Electricity $66,302 for Natural Gas The total energy costs are $256,962 per year. Table 1.1 below summarizes the energy efficiency measures analyzed for the Soldotna High School. 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 1 Lighting: EXTERIOR Replace with 9 FLUOR CFL, Spiral 23 W 2 Lighting: Replace with 13 FLUOR CFL, CLASSROOMS Reflector 26W PAR38 3 Lighting: OFFICES Replace with 5 FLUOR CFL, Reflector 26W PAR38 4 Lighting: THEATER - Replace with 58 FLUOR CFL, Overhead Spiral 23 W Emergency Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR 1 Simple Payback (Years) 2 $332 $ $300 $ $145 $ $964 $1, AkWarm ID No. CIRI SXQ CAEC 11 Page 5 of 47

6 Table 1.1 PRIORITY LIST ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description 5 Lighting: SHOP Replace with 2 FLUOR (4) T8 CLASSROOMS 4' F32T8 32W Standard (2) Instant StdElectronic 6 Lighting: EXTERIOR Replace with W Induction 7 Lighting: GYM Replace with 44 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic 8 Lighting: EXTERIOR Replace with W Induction 9 Lighting: STORAGE Replace with 2 FLUOR CFL, Reflector 26W PAR38 10 Lighting: HALLWAYS Add new Occupancy Sensor 11 Lighting: EXTERIOR Replace with 15 40W Induction 12 Lighting: EXTERIOR Replace with 4 80W Induction 13 Lighting: STORAGE Replace with 4 FLUOR CFL, Spiral 23 W 14 Ventilation F-3 Exhaust Fans - Add VFD and operate 3 existing fans in parallel to maintain bldg pressure. Replace dual F1 blowers with single axial fan and VFD Implement night setback cycling of F2. (Simulate impact by reducing OA by 1500 cfm. F-6/7 Implement demand ventilation. Reduce run time of misc. supply/ exhaust fans. Implement retrocommission to revise schedules. Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR 1 Simple Payback (Years) 2 $102 $ $1,628 $16, $3,217 $23, $2,543 $31, $16 $ $1,111 $11, $498 $8, $155 $2, $20 $ $15,868 $200, TOTAL, cost-effective measures The following measures were not found to be cost-effective: 15 Lighting: UPPER GYM Add new Occupancy Sensor 16 Lighting: Locker Add new Occupancy Rooms Sensor 17 Lighting: HALLWAYS Add new Occupancy Sensor 18 Lighting: HALLWAYS Add new Occupancy Sensor 19 Lighting: THEATER Replace with 7 FLUOR (2) T8 8' F96T8 57W Energy-Saver StdElectronic 20 Lighting: GYM Add new Occupancy Sensor $26,899 $296, $344 $4, $384 $5, $91 $1, $87 $1, $95 $1, $573 $10, AkWarm ID No. CIRI SXQ CAEC 11 Page 6 of 47

7 Table 1.1 PRIORITY LIST ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description 21 Lighting: SHOP Replace with 26 FLUOR (2) CLASSROOMS T8 8' F96T8 54W Energy- Saver StdElectronic 22 Lighting: UPPER GYM Replace with 18 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic 23 Lighting: STORAGE Replace with 12 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic 24 HVAC And DHW Cycle Fan F-2 at night only when heat is needed. Simulate reduction with duty cycle at 50%. Add insulation to piping at kitchen and domestic HXs. Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR 1 Simple Payback (Years) 2 $273 $6, $328 $9, $18 $1, $10,183 $45, TOTAL, all measures $18,9 $384, 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 $18,9 per year, or 7.4% of the buildings total energy costs. These measures are estimated to cost $384,406, for an overall simple payback period of 20.3 years. If only the cost effective measures are implemented, the annual utility cost can be reduced by $26,899 per year, or 10.5% of the buildings total energy costs. These measures are estimated to cost $296,358, for an overall simple payback period of 11.0 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 7 of 47

8 Description Siemens Industry, Inc. Space Heating Space Cooling Water Heating Lighting Existing Building $185,1 24 $0 $453 $62,21 9 With All $187,5 $0 $0 $42,48 Proposed 01 7 Retrofits SAVINGS $2,377 $0 $453 $19,73 3 Table 1.2 Annual Energy Cost Estimate Refrigera tion Other Electrical Cooking Clothes Drying Ventilatio n Fans Service Fees Total Cost $0 $5,140 $0 $0 $912 $3,113 $256,962 $0 $4,952 $0 $0 $0 $3,113 $238,053 $0 $188 $0 $0 $912 $0 $18,9 AkWarm ID No. CIRI SXQ CAEC 11 Page 8 of 47

9 2. AUDIT AND ANALYSIS BACKGROUND 2.1 Program Description This audit included services to identify, develop, and evaluate energy efficiency measures at the Soldotna High School. 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 High School 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 High School is classified as being made up of the following activity areas: 1) High School: 154,637 square feet AkWarm ID No. CIRI SXQ CAEC 11 Page 9 of 47

10 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 10 of 47

11 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 resimulated with the highest ranked measure included. Now all remaining measures are reevaluated 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 11 of 47

12 3. Soldotna High School (Photo From Google Maps) 3.1. Building Description The 154,637 square foot Soldotna High School was constructed in 1980, with a normal occupancy of 685 people. The number of hours of operation for this building average approximately 10 hours per day during the weekdays with additional hours on weekends for special events. Soldotna High School is comprised of typical classrooms, library, cafeteria with kitchen, theater, vocational classrooms, gymnasium, and pool. Description of Building Shell The exterior walls are constructed of a strapped masonry wall with 8 concrete block structural wall, 1 shim space 5 of rigid insulation panels The Roof of the building is constructed of 4 rigid insulation, 3 5/8 steel beams, pre cast concrete planks and exterior sealant. The Floor/Foundation of the building is constructed concrete slab foundation with carpet or tile flooring Typical windows throughout the building have double pane glass and thermally broken aluminum frames. Doors are half lite or full metal doors with interior insulation. Description of Heating and Cooling Plants The Heating Plant used in the building consists of: Boiler Plant Nameplate Information: Burnham KV1108WML Quantity: 3 Fuel Type: Natural Gas Input Rating: 1,876,000 BTU/hr Steady State Efficiency: 80 % AkWarm ID No. CIRI SXQ CAEC 11 Page 12 of 47

13 Idle Loss: 2 % Heat Distribution Type: Water Boiler Operation: All Year Notes: Dedicated burner blower 1.5hp and primary circulation pump 1.5hp Soldotna High School is served by three (3) 1,876 MBH Burnham boilers with 1.5 HP forced draft burners. Generally, only two boilers are used at one time and the third boiler is reported to be having circulation problems. Each boiler is equipped with a 2HP hot water circulation pump and a three way valve. Multiple other circulation pumps distributed hot water to terminal devices throughout the building, many of which are in parallel with identical pumps for redundancy. Space Heating and Cooling Distribution Systems Most heating is supplied by a variable air volume fan (F 1) which in turn supplies VAV boxes located in the classroom areas. The fan is actually two separate fans in parallel powered by two separate (2) 50HP motors. These two fans were originally meant to operate separately as needed. Both fans are instead operated at the same time because short circuiting of air occurs when only one fan is operated. All VAV boxes have a pneumatically controlled damper actuator that is controlled by area thermostats. Some VAV boxes that serve the vocational classrooms and the theater workrooms have VAV boxes with reheat coils that are controlled by either two way or threeway valves. Some vestibules, storage rooms, and mechanical rooms have either unit heaters or cabinet unit heaters. Fan 2 and Fan 4 deliver constant volume supply air to perimeter classrooms and the pool area, respectively. Fan 3 consists of three separate 5HP exhaust fans that are meant to control building pressure. These fans are controlled by pneumatic differential pressure sensor and each fan has gravity dampers. Fan 6 delivers variable air volume supply air to the auditorium through VAV boxes with reheat coils. AkWarm ID No. CIRI SXQ CAEC 11 Page 13 of 47

14 The school has a building wide Honeywell pneumatic control system consisting of two compressors located in two mechanical rooms cross connected into a common supply loop. Pneumatic temperature control panels are distributed across a variety of locations typically adjacent to their respective fan systems. Domestic Hot Water System Three (3) heat exchangers are fed hot water from the main boiler hot water loop. Heat Exchanger 1, 2, and 3 are dedicated to the pool water, kitchen hot water, and general domestic hot water, respectively General domestic hot water is stored in two (2) 870 gal storage tanks. A 2HP circulation pumps distributes domestic hot water throughout the building and a fractional horsepower pump acts as a return pump. The heat exchangers for kitchen and domestic hot water were noted as having poor insulation and giving off a considerable amount of heat to the boiler room. Waste Heat Recovery Information The pool fan system (F 4/F 8) includes a heat recovery system consisting of a pair of coils interconnected by a closed glycol loop. Heat is captured from a heat recovery coil located in the exhaust air and transferred otherwise wasted energy to the outside air supply stream pre heat coil. A small 1/4hp pump circulates the glycol and is controlled by a local thermostat. Description of Building Ventilation System Fresh air is served by the main air handing units. Multiple constant volume exhaust fans serve restrooms, pool, kitchen, vocational classrooms, and locker rooms. AkWarm ID No. CIRI SXQ CAEC 11 Page 14 of 47

15 Lighting Lighting in the academic areas consist predominately of two, three, and four lamp 2x4 fixtures with 32W T8 linear fluorescent lamps and electronic ballasts. The pool and gymnasium lighting consist of 250W metal halide lamps. Most of these areas are controlled with local on/off switches. Exterior lighting consists of metal halide and high pressure sodium fixtures of varying wattages that are controlled by time clocks or photo sensors. The theater workshop and some storage rooms still have T12 linear fluorescent lighting with magnetic ballasts. Plug Loads Classrooms and offices have typical plug loads that included computers, printers, and copy machines. The kitchen has numbers commercial sized kitchen appliances such as stove, heaters, warming table, dishwashers, as well as a walk in refrigerator and walk in freezer. The vocational classrooms have a variety of energy intensive tools such as table saws, drills and welders. However, these systems have a very brief operational run time. The pool has a 15HP pump that runs 24/7. There are a variety of remote buildings for sports related activities but many are unheated and all have limited hours of operation. 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 15 of 47

16 3.2 Predicted Energy Use 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. 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 $ /kWh Natural Gas $ 0.70/ccf Total Energy Use and Cost Breakdown At current rates, Kenai Peninsula Borough pays approximately $256,962 annually for electricity and other fuel costs for the Soldotna High School. 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 AkWarm ID No. CIRI SXQ CAEC 11 Page 16 of 47

17 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 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 17 of 47

18 Figure 3.3 Annual Space Heating Cost by Component Annual Space Heating Cost by Component Air Ceiling Window Wall/Door Floor $0 $20,000 $40,000 $60,000 $80,000 $100,000 $120,000 $140,000 Existing Retrofit 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. Electrical Consumption (kwh) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Lighting Other_Electrical Ventilation_Fans DHW Space_Heating Space_Cooling Natural Gas Consumption (ccf) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec DHW Space_Heating AkWarm ID No. CIRI SXQ CAEC 11 Page 18 of 47

19 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 High School 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 1,251,012 kwh 4,269, ,260,810 Natural Gas 94,311 ccf 9,431, ,874,363 Total 13,700,805 24,135,174 BUILDING AREA 154,637 Square Feet BUILDING SITE EUI 89 kbtu/ft²/yr BUILDING SOURCE EUI 156 kbtu/ft²/yr * Site Source Ratio data is provided by the Energy Star Performance Rating Methodology for Incorporating Source Energy Use document issued March AkWarm ID No. CIRI SXQ CAEC 11 Page 19 of 47

20 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 High School 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 20 of 47

21 Figure 3.4 Difference in Weather Data Soldotna, AK Weather Data Actual Dry Bulb (F) TMY3 Dry Bulb (F) Dry Bulb Temperature (F) /17/20 7/6/20 8/25/20 10/14/20 12/3/20 1/22/2010 3/13/2010 5/2/2010 6/21/2010 8/10/2010 Date 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 21 of 47

22 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 High School, Soldotna, Alaska PRIORITY LIST ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description 1 Lighting: EXTERIOR Replace with 9 FLUOR CFL, Spiral 23 W 2 Lighting: Replace with 13 FLUOR CFL, CLASSROOMS Reflector 26W PAR38 3 Lighting: OFFICES Replace with 5 FLUOR CFL, Reflector 26W PAR38 4 Lighting: THEATER - Replace with 58 FLUOR CFL, Overhead Spiral 23 W Emergency 5 Lighting: SHOP CLASSROOMS Replace with 2 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic 6 Lighting: EXTERIOR Replace with W Induction 7 Lighting: GYM Replace with 44 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic 8 Lighting: EXTERIOR Replace with W Induction 9 Lighting: STORAGE Replace with 2 FLUOR CFL, Reflector 26W PAR38 10 Lighting: HALLWAYS Add new Occupancy Sensor 11 Lighting: EXTERIOR Replace with 15 40W Induction 12 Lighting: EXTERIOR Replace with 4 80W Induction 13 Lighting: STORAGE Replace with 4 FLUOR CFL, Spiral 23 W Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) $332 $ $300 $ $145 $ $964 $1, $102 $ $1,628 $16, $3,217 $23, $2,543 $31, $16 $ $1,111 $11, $498 $8, $155 $2, $20 $ AkWarm ID No. CIRI SXQ CAEC 11 Page 22 of 47

23 Table 4.1 Soldotna High School, Soldotna, Alaska PRIORITY LIST ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description 14 Ventilation F-3 Exhaust Fans - Add VFD and operate 3 existing fans in parallel to maintain bldg pressure. Replace dual F1 blowers with single axial fan and VFD Implement night setback cycling of F2. (Simulate impact by reducing OA by 1500 cfm. F-6/7 Implement demand ventilation. Reduce run time of misc. supply/ exhaust fans. Implement retrocommission to revise schedules. Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) $15,868 $200, TOTAL, cost-effective $26,899 $296, measures The following measures were not found to be cost-effective: 15 Lighting: UPPER GYM Add new Occupancy $344 $4, Sensor 16 Lighting: Locker Add new Occupancy $384 $5, Rooms Sensor 17 Lighting: HALLWAYS Add new Occupancy $91 $1, Sensor 18 Lighting: HALLWAYS Add new Occupancy $87 $1, Sensor 19 Lighting: THEATER Replace with 7 FLUOR (2) T8 $95 $1, ' F96T8 57W Energy-Saver StdElectronic 20 Lighting: GYM Add new Occupancy $573 $10, Sensor 21 Lighting: SHOP Replace with 26 FLUOR (2) $273 $6, CLASSROOMS T8 8' F96T8 54W Energy- Saver StdElectronic 22 Lighting: UPPER GYM Replace with 18 FLUOR (4) $328 $9, T8 4' F32T8 32W Standard (2) Instant StdElectronic 23 Lighting: STORAGE Replace with 12 FLUOR (2) $18 $1, T8 4' F32T8 32W Standard Instant StdElectronic 24 HVAC And DHW Cycle Fan F-2 at night only -$10,183 $45, when heat is needed. Simulate reduction with duty cycle at 50%. Add insulation to piping at kitchen and domestic HXs. TOTAL, all measures $18,9 $384, AkWarm ID No. CIRI SXQ CAEC 11 Page 23 of 47

24 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. AkWarm ID No. CIRI SXQ CAEC 11 Page 24 of 47

25 4.3 Building Shell Measures The exterior walls around the pool area were noted to be losing more heat through gaps in insulation than other areas of the building. While a complete insulation replacement in these walls would be expensive and is not recommended at this time, it is recommended that the insulation in this area be monitored as humidity in the pool area may start to degrade the wall insulation. Refer to Section C of the Appendix for infrared pictures of the area. AkWarm ID No. CIRI SXQ CAEC 11 Page 25 of 47

26 4.4 Mechanical Equipment Measures Heating/Cooling/Domestic Hot Water Measure Rank Recommendation 24 Cycle Fan F 2 at night only when heat is needed. Simulate reduction with duty cycle at 50%. Add insulation to piping at kitchen and domestic HXs. Installation Cost $45,000 Estimated Life of Measure (yrs) 20 Energy Savings (/yr) $10,183 Breakeven Cost $153,164 Savings to Investment Ratio 3.4 Simple Payback yrs 1000 Auditors Notes: Fan-2 Scheduling Observation Fan 2 currently delivers perimeter heating during the night when the building is not occupied. Traditionally, equipment serving the same building area (zone) is scheduled to turn off or scale down during unoccupied periods. The problem with this approach is that equipment schedules often do not match and equipment is left operating when it could be turned off. Recommendations Fan 2 should be programmed to run only when needed during the unoccupied periods. One of the most successful ways to control building energy is to schedule building systems and equipment based on building occupancy and special event schedules. Taking control of equipment scheduling is the quickest and simplest way to achieve an immediate reduction in energy usage. Air handler scheduling saves significant electrical energy for fans and/or pumps, heating energy for ventilation air and night temperature setback during hot seasons. This cost includes adding / upgrading DDC to major mechanical systems. Heat Exchanger Insulation Observations The kitchen and domestic hot water heat exchangers and the piping that feeds into them have poor insulation. These un insulated systems are continuously losing heat and energy to the mechanical room space, reducing the deliverable capacity. 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 water piping systems. AkWarm ID No. CIRI SXQ CAEC 11 Page 26 of 47

27 4.4.2 Ventilation System Measures Rank Description Recommendation 14 F 3 Exhaust Fans Add VFD and operate 3 existing fans in parallel to maintain bldg pressure. Replace dual F1 blowers with single axial fan and VFD Implement night setback cycling of F2. (Simulate impact by reducing OA by 1500 cfm. F 6/7 Implement demand ventilation. Reduce run time of misc. supply/ exhaust fans. Implement retro commission to revise schedules. Installation Cost $200,000 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $15,868 Breakeven Cost $201,566 Savings to Investment Ratio 1.0 Simple Payback yrs 13 Auditors Notes: Building Pressure Fan Modifications Observation Fan 3 consists of three separate 5HP exhaust fans that are meant to control building pressure. These fans are controlled by pneumatic differential pressure sensor. Recommendations Siemens recommends installing a variable frequency drive (VFD) on each fan motor and installing a DDC pressure sensor to control the fans. VFDs control airflow by varying the speed of the motor based on the differential pressure set point between interior and the exterior environments. This form of control results in significant motor energy savings because the motor only uses the energy required to satisfy building pressure. In this case, energy would also be conserved by limiting the amount tempered air that is exhausted from the building. Fan-1 Modifications Observation Fan 1 serves the academic area VAV boxes and has two motors that operate at the same time in parallel. Recommendations Siemens recommends removing both fans and replacing them with a single axial fan and a single appropriately sized premium efficiency motor. High efficiency motors should be considered when installing variable frequency drives. Some standard duty motors may not function well with the VFD inverters. Siemens also recommends installing a variable frequency drive (VFD) Fan 1. VFDs control airflow by varying the speed of the motor based on the differential pressure set point of the system. This form of control results in significant motor energy savings because the motor only uses the energy required to satisfy the load. A DDC system would be installed on this fan in order to make the necessary control sequence changes. AkWarm ID No. CIRI SXQ CAEC 11 Page 27 of 47

28 Auditorium Demand Control Ventilation (Fan-6 and Fan-7) Observation The auditorium air handling unit currently has two variable air volume fans. Fan 6 delivers supply air to the area, while Fan 7 handles return air. The existing auditorium fan systems supply air to the space and have minimum requirements of outside air. This amount of required outside air varies based on occupancy. The more people in the space, the more outside air should be delivered. The occupancy of these spaces varies throughout the day, but the minimum amount of outside air delivered to the space remains constant. Recommendations Siemens recommends using carbon dioxide (CO2) sensors in the return air streams of the air handling unit to monitor the percentage of CO2 in auditorium. Based on that percentage the outside air, return air and exhaust air dampers can be more tightly controlled to supply the space with the proper amount of ventilation without conditioning outside air that is not required. This type of control, called demand ventilation, is a newer concept and offers a means of optimizing the amount of ventilation required for a building or space. Energy savings are achieved by limiting the volume of outside air that must be conditioned. Demand control ventilation (DCV) is a control strategy that adjusts the amount of outside air based on the number of occupants and the ventilation needs of those occupants. Not heating or cooling unnecessary quantities of outside air conserves energy. Ventilation is based on the needs of the occupants of the space rather than using a fixed strategy based on design occupancy. DCV modulates ventilation to maintain target cfm per person ventilation rates based on actual occupancy. CO2 is used as an occupancy indicator to modulate ventilation below the maximum total outdoor air intake rate while maintaining the required ventilation rate per person. DCV avoids excessive over ventilation while still maintaining good ventilation and providing required cfm per person outside air requirements specified by local codes and standards. To accomplish demand control ventilation, the pneumatic controls on the auditorium air handling unit would be replaced with a DDC system. Retro-Commissioning Recommendations The retro commissioning process would include analyzing major equipment throughout the building and identifying operational and equipment deficiencies. Over time, equipment set points and schedules may no longer fit the needs of the building or its occupants. Additionally, equipment deficiencies, such as dampers or actuators that are no longer properly operating, can be corrected at this time. Retro Commissioning would also include: Optimizing minimum outdoor air intake through air handling units. AkWarm ID No. CIRI SXQ CAEC 11 Page 28 of 47

29 Program discharge air temperature (DAT) reset schedules to conserve heating, cooling, and fan energy of all air handling units Provide supply air static pressure reset schedules to conserve fan electric energy Fix Boiler 3 water circulation problems. (This is operational no energy saving claimed) Reduce runtime of exhaust fans validate schedule and minimize operation to reduce both electrical and outside air drawn into building. Program mixed air temperature (MAT) reset schedules in accordance with DAT reset schedules Program return fan speeds to appropriately track supply fan speeds Calibrate MAT and DAT sensors and feedback control loops Calibrate economizer cycle operation of AHUs Provide new control sequences for all AHUs and unit ventilators Night Setback Thermostat Measures See FIM for System F 2 AkWarm ID No. CIRI SXQ CAEC 11 Page 29 of 47

30 4.5 Electrical & Appliance Measures 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. Occupancy Sensors Observations Currently, the lights in the gymnasiums, hallways, and locker rooms are controlled locally by wall switches. These switches allow the teachers, staff and students to turn the light fixtures on and off as required. However, there are times when lights are left on even though the rooms are unoccupied. Recommendations Siemens recommends installing motion/occupancy sensors to turn the lights on and off based on the use of the space. The sensors could be mounted on the ceiling in some areas so that the entire area is sensed. The sensing device would be a dual technology infrared and ultrasonic device that would sense both noise and motion. The sensors also have time and sensitivity adjustments. Exterior Lighting Observations Exterior building and parking lot lighting consists of metal halide fixtures of varying wattages. Recommendations It is recommended that the existing exterior metal halide fixtures be replaced with more energy efficient induction lighting fixtures. These systems offer superior light rendering and over 100,000 hours of useful life. This long operational equipment life considerably reduces necessary maintenance and equipment replacement. Metal Halide Lighting Observations The pool and the gymnasiums have metal halide lighting that is inefficient and requires lengthy start up times. Recommendations It is recommended that the metal halide fixtures in the gyms be replaced with more energy efficient T8 linear fluorescent lighting fixtures. Fixtures in the gymnasium would be enclosed in metal cages to prevent damage from balls and other projectiles. Occupancy Sensors should also be installed in these areas to limit the amount time that lights are left on during unoccupied periods. Metal halide fixtures in the natatorium should be retrofitted with induction fixtures designed for use in humid swimming pool environments. These fixtures consume much less energy, offer better light rendering, and offer the ability to turn the lights on and off instantly. AkWarm ID No. CIRI SXQ CAEC 11 Page 30 of 47

31 T-12 Lighting Siemens Industry, Inc. Observations The theater workshop and some storage rooms still have T12 linear fluorescent lighting with magnetic ballasts. Recommendations Siemens recommends replacing inefficient T 12 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, new fixtures would have to be installed. Electronic ballasts use less energy and reduce flicker, glare, noise, and heat output a Lighting Measures Replace Existing Fixtures/Bulbs Rank Location Existing Condition Recommendation 23 STORAGE 12 FLUOR (2) T12 4' F40T12 34W Energy Saver Magnetic with Manual Switching Replace with 12 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic Installation Cost $1,238 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $18 Breakeven Cost $219 Savings to Investment Ratio 0.2 Simple Payback yrs 69 Auditors Notes: $103.17/fix Rank Location Existing Condition Recommendation 22 UPPER GYM 18 MH 150 Watt StdElectronic with Manual Switching Replace with 18 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic Installation Cost $9,613 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $328 Breakeven Cost $3,978 Savings to Investment Ratio 0.4 Simple Payback yrs 29 Auditors Notes: $534.04/fix ~$4475 for Occ Sensors Rank Location Existing Condition Recommendation 21 SHOP CLASSROOMS 26 FLUOR (2) T12 8' F96T12 75W Standard Magnetic with Manual Switching Replace with 26 FLUOR (2) T8 8' F96T8 54W Energy Saver StdElectronic Installation Cost $6,500 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $273 Breakeven Cost $3,330 Savings to Investment Ratio 0.5 Simple Payback yrs 24 Auditors Notes: ~$250/fix* AkWarm ID No. CIRI SXQ CAEC 11 Page 31 of 47

32 Rank Location Existing Condition Recommendation 20 GYM 44 MH 250 Watt StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $10,972 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $573 Breakeven Cost $6,954 Savings to Investment Ratio 0.6 Simple Payback yrs 19 Auditors Notes: $534.04/fix ~$10,972 Rank Location Existing Condition Recommendation 19 THEATER 7 FLUOR (2) T12 8' F96T12 75W Standard Magnetic with Manual Switching Replace with 7 FLUOR (2) T8 8' F96T8 57W Energy Saver StdElectronic Installation Cost $1,750 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $95 Breakeven Cost $1,154 Savings to Investment Ratio 0.7 Simple Payback yrs 18 Auditors Notes: ~$250/fix* Rank Location Existing Condition Recommendation 18 HALLWAYS 20 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $1,500 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $87 Breakeven Cost $1,057 Savings to Investment Ratio 0.7 Simple Payback yrs 17 Auditors Notes: ~6 Fixtures/Sensor ~3 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 17 HALLWAYS 21 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $1,500 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $91 Breakeven Cost $1,111 Savings to Investment Ratio 0.7 Simple Payback yrs 16 Auditors Notes: ~6 Fixtures/Sensor ~3 Sensors Needed $500/Sensor Rank Location Existing Condition Recommendation 16 Locker Rooms 59 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $5,500 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $384 Breakeven Cost $4,664 Savings to Investment Ratio 0.8 Simple Payback yrs 14 Auditors Notes: ~11 Sensors Needed $500/Sensor AkWarm ID No. CIRI SXQ CAEC 11 Page 32 of 47

33 Rank Location Existing Condition Recommendation 15 UPPER GYM 18 MH 150 Watt StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $4,475 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $344 Breakeven Cost $4,173 Savings to Investment Ratio 0.9 Simple Payback yrs 13 Auditors Notes: $534.04/fix ~$4475 for Occ Sensors Rank Location Existing Condition Recommendation 13 STORAGE 4 INCAN A Lamp, Std 100W with Manual Switching Replace with 4 FLUOR CFL, Spiral 23 W Installation Cost $1 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $20 Breakeven Cost $126 Savings to Investment Ratio 1.1 Simple Payback yrs 6 Auditors Notes: $27.30/fix Rank Location Existing Condition Recommendation 12 EXTERIOR 4 MH 150 Watt StdElectronic with Manual Switching Replace with 4 80W Induction Installation Cost $2,587 Estimated Life of Measure (yrs) 27 Energy Savings (/yr) $155 Breakeven Cost $2,977 Savings to Investment Ratio 1.2 Simple Payback yrs 17 Auditors Notes: /fix Rank Location Existing Condition Recommendation 11 EXTERIOR 15 HPS 100 Watt StdElectronic with Manual Switching Replace with 15 40W Induction Installation Cost $8,154 Estimated Life of Measure (yrs) 27 Energy Savings (/yr) $498 Breakeven Cost $9,575 Savings to Investment Ratio 1.2 Simple Payback yrs 16 Auditors Notes: $543.43/fix Rank Location Existing Condition Recommendation 10 HALLWAYS 130 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic with Manual Switching Add new Occupancy Sensor Installation Cost $11,000 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $1,111 Breakeven Cost $13,491 Savings to Investment Ratio 1.2 Simple Payback yrs 10 Auditors Notes: 6 Fixtures/Sensor ~22 Sensors Needed $500/Sensor AkWarm ID No. CIRI SXQ CAEC 11 Page 33 of 47

34 Rank Location Existing Condition Recommendation 9 STORAGE 2 INCAN A Lamp, Std 150W with Manual Switching Replace with 2 FLUOR CFL, Reflector 26W PAR38 Installation Cost $70 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $16 Breakeven Cost $101 Savings to Investment Ratio 1.4 Simple Payback yrs 4 Auditors Notes: ~$35/fix Rank Location Existing Condition Recommendation 8 EXTERIOR 32 MH 400 Watt StdElectronic with Manual Switching Replace with W Induction Installation Cost $31,034 Estimated Life of Measure (yrs) 27 Energy Savings (/yr) $2,543 Breakeven Cost $47,883 Savings to Investment Ratio 1.5 Simple Payback yrs 12 Auditors Notes: $969.80/fix Rank Location Existing Condition Recommendation 7 GYM 44 MH 250 Watt StdElectronic with Manual Switching Replace with 44 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic Installation Cost $23,498 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $3,217 Breakeven Cost $39,010 Savings to Investment Ratio 1.7 Simple Payback yrs 7 Auditors Notes: $534.04/fix ~$10,972 Rank Location Existing Condition Recommendation 6 EXTERIOR 23 MH 250 Watt StdElectronic with Manual Switching Replace with W Induction Installation Cost $16,947 Estimated Life of Measure (yrs) 27 Energy Savings (/yr) $1,628 Breakeven Cost $31,318 Savings to Investment Ratio 1.8 Simple Payback yrs 10 Auditors Notes: $736.84/fix Rank Location Existing Condition Recommendation 5 SHOP CLASSROOMS 2 MH 400 Watt StdElectronic with Manual Switching Replace with 2 FLUOR (4) T8 4' F32T8 32W Standard (2) Instant StdElectronic Installation Cost $600 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $102 Breakeven Cost $1,248 Savings to Investment Ratio 2.1 Simple Payback yrs 6 Auditors Notes: ~300/fix* AkWarm ID No. CIRI SXQ CAEC 11 Page 34 of 47

35 Rank Location Existing Condition Recommendation 4 THEATER Overhead Emergency 58 INCAN A Lamp, Std 100W with Manual Switching Replace with 58 FLUOR CFL, Spiral 23 W Installation Cost $1,583 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $964 Breakeven Cost $6,127 Savings to Investment Ratio 3.9 Simple Payback yrs 2 Auditors Notes: $27.30/fix Rank Location Existing Condition Recommendation 3 OFFICES 5 INCAN A Lamp, Std 150W with Manual Switching Replace with 5 FLUOR CFL, Reflector 26W PAR38 Installation Cost $175 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $145 Breakeven Cost $922 Savings to Investment Ratio 5.3 Simple Payback yrs 1 Auditors Notes: ~$35/fix Rank Location Existing Condition Recommendation 2 CLASSROOMS 13 INCAN A Lamp, Std 150W with Manual Switching Replace with 13 FLUOR CFL, Reflector 26W PAR38 Installation Cost $355 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $300 Breakeven Cost $1,906 Savings to Investment Ratio 5.4 Simple Payback yrs 1 Auditors Notes: $27.30/fix Rank Location Existing Condition Recommendation 1 EXTERIOR 9 INCAN A Lamp, Std 100W with Manual Switching Replace with 9 FLUOR CFL, Spiral 23 W Installation Cost $246 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $332 Breakeven Cost $2,121 Savings to Investment Ratio 8.6 Simple Payback yrs 1 Auditors Notes: $27.30/fix 4.5.1b Lighting Measures Lighting Controls category) (There were no improvements in this Refrigeration Measures While no savings was calculated it is recommended that if the School Kitchen is not in use over the summer break that a policy be instituted by the school that shuts down all refrigerators and freezers. Care must be taken to insure that the units are properly emptied prior to shutting them down and that the systems are sanitized properly prior to starting them again. This measure is a low/no cost measure that can be made part of the year end checklist. Savings come from a reduction in electrical consumption and demand by reducing the electrical load at the facility. AkWarm ID No. CIRI SXQ CAEC 11 Page 35 of 47

36 4.5.3 Other Electrical Measures (There were no improvements in this category) Cooking Measures (There were no improvements in this category) Clothes Drying Measures (There were no improvements in this category) AkWarm ID No. CIRI SXQ CAEC 11 Page 36 of 47

37 Appendix A Major Equipment List Boilers Quantity 3 Make Burnham Mod KV1108WML MBH out 1,517 MBH in 1,876 Hi/Lo Burner 1875 MBH max, 1125 MBH min, 80% Boiler Circulation Pumps Tag Size P-1A 1550/2050W P-1B 1440W P-1A Upper 1440W Circulation Pumps Tag Size % Eff Notes P-14 5HP 87.5% One runs at a time P-15 5HP 87.5% P-4 Upper 3HP 82.5% One runs at Pool, Voc Ed, P-4 3HP 82.5% a time Aud, Band P W 82.5% DHW, 24/7 P W Coils to F-1&F-2 Domestic Hot Water Devices Number of DHW Tanks 2 Volume 870 gal Number of Heat Exchangers 3 AkWarm ID No. CIRI SXQ CAEC 11 Page 37 of 47

38 Fans Tag Serves CFM HP VAV/CV S,R,E note F-1 Core All 37, VAV S 2 x 50HP F-2 Perimeter 24, CV S F-3 Core All 31, VAV E 3 x 5HP F-4 Pool 14, CV S F-5 Fan Rm F CV E w/ F-6 F-6 Auditorium 39, VAV S F-7 Auditorium 31, VAV R/E F-8 Pool 6,940 5 CV E Heat Recovery w/f-4 F-9 Toilet 1, CV E w/ F-1 F-10 Toilet 1, CV E w/ F-6 F-11 Chlorine Rm CV E F-12 Kitchen 2,625 2 CV E F-13 Kitchen 3,000 3 CV E F-14 Kitchen 3,375 3 CV E F-15 Metal Shop 2,800 1 CV E F-16 Wood Shop 4,550 5 CV E F-17 Metal Shop 2, CV E F CV E F-19 Locker Rm CV E W/ F-6 F-20 Shop Finish Rm CV E F-21 Boiler Rm 4, CV E F-22 Chem Lab 1, CV E F-23 Room CV E F CV E F-25 Comfort Station CV E F-26 Auditorium Booth CV E Static Pressure Fans Quantity 3 Size 5 85% Notes No staged control, currently have gravity dampers Kitchen Compressors Tag Make Model RLA LRA Compressor-1 Copeland C3AL-0300-TAG Compressor-2 Copeland DBAM-0150-CAB AkWarm ID No. CIRI SXQ CAEC 11 Page 38 of 47

39 Appendix B Lighting Inventory 100W HPS 100W Incandescent 150 W MH 150W Incandescent 1x4x2 T8 1x8x2 T W MH 2x4x2 T8 2x4x3 T8 2x4x4 T8 400W MH 1x4x2 T12 (34W) Grand Total Classrooms Exterior Gymnasium Hallways Offices Pool Area Restrooms / Locker Rooms Storage Shop Classrooms Theater Area Grand Total AkWarm ID No. CIRI SXQ CAEC 11 Page 39 of 47

40 Appendix C IR Photos Exterior pool area walls show signs of heat loss through gaps in the insulation paneling and doors. Exterior classroom walls on the west side of the building show heat loss through gaps in the insulation paneling and windows. Some heat is also lost through the exposed foundation. AkWarm ID No. CIRI SXQ CAEC 11 Page 40 of 47