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KONI-2A3-CAEC Larsen Bay School 2012-EE
Larsen Bay School AkWarm ID No. KONI-2A3-CAEC-01 Submitted by: Central Alaska Engineering Company Contact: Jerry P. Herring, P.E., C.E.A. 32215 Lakefront Drive Soldotna, Alaska 99669 Phone (907) 260-5311 akengineer@starband.net June 26, 2012 CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐2A3‐CAEC‐01 PAGE i OF iv CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐2A3‐CAEC‐01 PAGE ii OF iv CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐2A3‐CAEC‐01 PAGE iii OF iv AEE ...................................................................................................................... Association of Energy Engineers AHFC ........................................................................................................... Alaska Housing Finance Corporation AHU .............................................................................................................................................. Air Handling Unit ARIS ............................................................................................................... Alaska Retrofit Information System ARRA .................................................................................................. American Recovery and Reinvestment Act ASHRAE .................................. American Society of Heating, Refrigeration, and Air-Conditioning Engineers BPO .................................................................................................................................... Building Plant Operator BTU ......................................................................................................................................... British Thermal Unit CAEC ......................................................................................................... Central Alaska Engineering Company CCF .................................................................................................................................... Hundreds of Cubic Feet CFL ......................................................................................................................................... Compact Fluorescent CFM ...................................................................................................................................... Cubic Feet per Minute DDC ........................................................................................................................................ Direct Digital Control deg F ........................................................................................................................................... Degrees Fahrenheit DHW ........................................................................................................................................ Domestic Hot Water ECI .............................................................................................................................................. Energy Cost Index EEM .............................................................................................................................. Energy Efficiency Measure EMCS ........................................................................................................... Energy Management Control System EPA ................................................................................................................... Environmental Protection Agency EUI .................................................................................................................................... Energy Utilization Index hr(s) ................................................................................................................................................................ Hour(s) HP ........................................................................................................................................................... Horsepower HPS ........................................................................................................................................ High Pressure Sodium HVAC ................................................................................................. Heating, Ventilation, and Air-Conditioning IES ....................................................................................................................... Illuminating Engineering Society IGA ..................................................................................................................................... Investment Grade Audit kBtu ................................................................................................................ Thousands of British Thermal Units KIBSD ....................................................................................................... Kodiak Island Borough School District kWh .................................................................................................................................................... Kilowatt Hour LED ......................................................................................................................................... Light Emitting Diode ORNL .................................................................................................................... Oak Ridge National Laboratory sf ............................................................................................................................................................... Square Feet SIR ............................................................................................................................... Savings to Investment Ratio SP ...................................................................................................................................................... Simple Payback W ....................................................................................................................................................................... Watts CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐2A3‐CAEC‐01 PAGE iv OF iv REPORT DISCLAIMER This Investment Grade Audit (IGA) was performed using American Recovery and Reinvestment Act (ARRA) funds, managed by Alaska Housing Finance Corporation (AHFC). IGA’s 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. This energy audit is intended to identify and recommend potential areas of energy savings, estimate the value of the savings and approximate the costs to implement the recommendations. 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 recommendations should all be first analyzed through a thorough lighting analysis to assure that the recommended lighting upgrades will comply with State of Alaska Statute as well as Illuminating Engineering Society (IES) recommendations. Central Alaska Engineering Company bears no responsibility for work performed as a result of this report. Payback periods may vary from those forecasted due to the uncertainty of the final installed design, configuration, equipment selected, and installation costs of recommended Energy Efficiency Measures (EEMs), or the operating schedules and maintenance provided by the owner. Furthermore, EEMs are typically interactive, so implementation of one EEM may impact the cost savings from another EEM. Neither the auditor, Central Alaska Engineering Company, AHFC, or any other party involved in preparation of this report, accepts liability for financial loss due to EEMs that fail to meet the forecasted payback periods. This energy audit meets the criteria of a Level 2 IGA per the American Society of Heating, Refrigeration, Air-conditioning Engineers (ASHRAE). The life of the IGA may be extended on a case- by-case basis, at the discretion of AHFC. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 1 OF 22 This report presents the findings of an investment grade energy audit conducted for: Kodiak Island Borough School District Contact: Gregg Hacker 722 Mill Bay Road Kodiak, AK 99615 Email: ghacker01@kibsd.org Alaska Housing Finance Corporation Contact: Rebekah Luhrs 4300 Boniface Parkway Anchorage, AK 99510 Email: rluhrs@ahfc.us This audit was performed using ARRA funds to promote the use of innovation and technology to solve energy and environmental problems in a way that improves the State’s economy. This can be achieved through the wiser and more efficient use of energy. The purpose of the energy audit is to identify cost-effective system and facility modifications, adjustments, alterations, additions and retrofits. Systems investigated during the audit included heating, ventilation, and air conditioning (HVAC), interior and exterior lighting, motors, building envelope, and energy management control systems (EMCS). The July 2008 – June 2010 average annual utility costs at this facility are as follows: School Electricity $ 31,548 School Fuel Oil $ 52,129 Total $ 83,677 School EUI: 81.1 kBtu/sf School ECI: 4.20 $/sf Energy Use per Occupant: 80.9 MMBtu per Occupant Energy Cost per Occupant: $4,188 per Occupant The potential annual energy savings are shown on the following page in Table 1.1 which summarizes the Energy Efficiency Measures (EEM’s) analyzed for the Larsen Bay School. Listed are the estimates of the annual savings, installed cost, and two different financial measures of return on investment. Be aware that the measures are not cumulative because of the interrelation of several of the measures. The cost of each measure for this level of auditing is considered to be + 30% until further detailed engineering, specifications, and hard proposals are obtained. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 2 OF 22 Rank Feature Improvement Description Annual Energy Savings Installed Cost1 Savings to Investment Ratio, SIR2 Simple Payback (Years)3 1 On- or Below-Grade Floor, Perimeter: BGFP Install R-19 Fiberglass Batts on the Perimeter 2 feet of the Crawl Space Floor. $1,141 $2,094 12.92 1.8 2 Setback Thermostat: School Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the School space. $10,821 $23,000 6.39 2.1 3 Lighting - Combined Retrofit: Common 400W MH Replace with 6 LED (3) 115W Module StdElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch and Improve Daylight Sensor $574 + $760 Maint. Savings $7,200 2.20 12.5 4 Lighting - Combined Retrofit: Gym 8' 2 bulb T12 Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch $1,710 + $1,500 Maint. Savings $17,600 2.16 10.3 5 Ventilation Install premium motors and variable speed controllers on 4 AHUs $4,944 $32,600 2.00 6.6 6 Refrigeration - Combined Retrofit: Combined Refrigeration Replace with 4 Refrigeration and Add new Seasonal Shutdown $691 $5,200 1.94 7.5 7 HVAC And DHW Implement a reduced run time scheme through DDC controls for boilers, motors and DHW to reduce heat wasted during unoccupied hours ($7,500). Install timer controls with DDC system on DWH circulation pumps to shut-off during non- occupied times ($7,500). Install new side-arm DHW maker in place of existing broken fuel oil fired water heater ($12,500). $947 + $450 Maint. Savings $14,500 1.77 15.3 8 Lighting - Combined Retrofit: Various 4' 3 bulb T12 Replace with 20 FLUOR (3) T8 4' F32T8 28W Energy-Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch $1,150 + $900 Maint. Savings $14,500 1.67 12.6 9 Lighting - Combined Retrofit: Various 4' 2 bulb T12 Replace with 106 FLUOR (2) T8 4' F32T8 28W Energy-Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch and Improve On/Off Photoswitch $3,463 + $3,500 Maint. Savings $59,100 1.40 17.1 10 Lighting - Combined Retrofit: Shop 8' 3 bulb T12 Replace with 10 FLUOR (3) T8 8' F96T8 54W Energy-Saver HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch $974 + $750 Maint. Savings $15,000 1.36 15.4 TOTAL, all measures $26,414 + $7,860 Maint. Savings $190,794 2.39 7.2 CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 3 OF 22 Table Notes: 1. Cost estimates were generated using the Program Demand Cost Model for Alaskan Schools, 12th Edition, Updated 2011, developed for the State of Alaska DOE, Education Support Services/Facilities. Renovations Projects Manual provides information on school renovation costs. Upon developing a final scope of work for an upgrade with detailed engineering completed, detailed savings and benefits can then be better determined. Some of the EEM’s should be completed when equipment meets the burn-out phase and is required to be replaced and in some cases will take significant investment to achieve. 2. 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. 3. 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 $26,414 per year, or 31.0% of the buildings’ total energy costs. These measures are estimated to cost $190,794, for an overall simple payback period of 7.2 years. If only the cost-effective measures are implemented, the annual utility cost can be reduced by $26,414 per year, or 31.0% of the buildings’ total energy costs. These measures are estimated to cost $190,794, for an overall simple payback period of 7.2 years. Table 1.2 provides 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. Description Space Heating Water Heating Lighting Refrigeration Other Electrical Ventilation Fans Total Cost Existing Building $59,281 $6,141 $11,838 $2,304 $459 $5,311 $85,334 With All Proposed Retrofits $45,258 $3,346 $3,967 $1,613 $459 $4,277 $58,920 SAVINGS $14,023 $2,795 $7,871 $691 $0 $1,034 $26,414 CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 4 OF 22 While the intent of many Energy Efficiency Measures is to increase the efficiency of fuel-burning and electrical equipment, an important factor of energy consumption lies in the operational profiles which control the equipment usage. Such profiles can be managed by administrative controls and departmental leadership. They determine how and when equipment is used, and therefore have a greater impact on energy savings potential than simple equipment upgrades alone. Significant energy cost savings can be realized when EEMs are combined with efficient minded operational profiles. Operational profiles may be outlined by organization policy or developed naturally or historically. These profiles include, but are not limited to; operating schedules, equipment set-points and control strategies, maintenance schedules, and site and equipment selection. Optimization of operational profiles can be accomplished by numerous methods so long as the intent is reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost savings solely as a result of operational optimization are difficult to predict. Quantification, however, is easy to accomplish by metering energy usage during and/or after implementation of energy saving operational profiles and EEMs. Optimization of site selection includes scheduling and location of events. If several buildings in a given area are all lightly used after regularly occupied hours, energy savings can be found when after-hour events are consolidated and held within the most energy efficient buildings available for use. As a result, unoccupied buildings could be shut-down to the greatest extent possible to reduce energy consumption. Operational behaviors which can be combined with equipment upgrades are operating schedules and equipment control strategies including set-points. Occupancy and daylight sensors can be programmed to automatically shut-off or dim lighting when rooms are unoccupied or sufficiently lit from the sun. Operating schedules can be optimized to run equipment only during regular or high-occupancy periods. Also, through a central control system, or with digital programmable thermostats, temperature set-points can be reduced during low-occupancy hours to maximize savings. In addition, domestic hot water circulation systems and sporadically used equipment can be shut-down during unoccupied hours to further save energy. In general, having equipment operating in areas where no occupants are present is inefficient, and presents an opportunity for energy savings. Operational profiles can also be implemented to take advantage of no or low cost EEMs. Examples include heating system optimizations (boiler section cleaning, boiler flush-through cleaning, and completing preventative maintenance on outside air damper and temperature reset systems) and tighter controls of equipment set-backs and shut-downs (unoccupied zones equipment shut-down, easier access to and finer control of equipment for after-hours control). In a large facility management program, implementation of these measures across many or all sites will realize dramatic savings due to the quantity of equipment involved. Changes to building operational profiles can only be realized while simultaneously addressing health, safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or implement operational behaviors which do not meet such considerations. That said, it is quite practical for management groups to implement administrative controls which reduce losses brought about by excess and sub-optimum usage. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 5 OF 22 This comprehensive energy audit covers the 19,945 sf Larsen Bay School depicted below in Figure 2.1, including classrooms, restrooms, administrative office, shop, commons area and gymnasium. The gym section of the school was built in 1980 and classrooms were added in 1988. Utility information was collected and analyzed for two years of energy use by the building. This information was used to analyze operational characteristics, calculate energy benchmarks for comparison to industry averages, estimate savings potential and establish a baseline to monitor the effectiveness of implemented measures. An excel spreadsheet was used to enter, sum, and calculate benchmarks and to graph energy use information (refer to Appendix A for the Benchmark Report for the School and Appendix G for the Benchmark Report for the portable buildings). The Annual Energy Utilization Index (EUI) is expressed in Thousands of British Thermal Units/Square Foot (kBtu/sf) and can be used to compare energy consumption to similar building types or to track consumption from year to year in the same building. The EUI is calculated by converting annual consumption of all fuels used to Btu’s then dividing by the area (gross conditioned square footage) of the building. EUI is a good indicator of the relative potential for energy savings. A comparatively low EUI indicates less potential for large energy savings. Building architectural drawings were utilized to calculate and verify the gross area of the facility. The gross area was confirmed on the physical site investigation. Refer to Section 6.0 of this report for additional details on EUI issues. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 6 OF 22 After gathering the utility data and calculating the EUI, the next step in the audit process was to review the drawings to develop a building profile which documented the building age, type, usage, and major energy consuming equipment or systems such as lighting, heating, ventilation and air condition (HVAC), domestic hot water heating, refrigeration, etc. The building profile is utilized to generate, and answer, possible questions regarding the facility’s energy usage. These questions were then compared to the energy usage profiles developed during the utility data gathering step. After this information is gathered, the next step in the process is the physical site investigation (site visit). The site visit was completed on May 31, 2012 and was spent inspecting the actual systems and answering specific questions from the preliminary review. Occupancy schedules, O&M practices, building energy management program, and other information that has an impact on energy consumption were obtained. Photos of the major equipment and building construction were taken during the site visit. Several of the site photos are included in this report as Appendix D. Thermal images of the building’s exterior were taken during the site visit. These thermal images illustrate heat loss exhibited by the school. Several of the thermal images are included in this report as Appendix E. The post-site work includes evaluation of the information gathered during the site visits, developing the AkWarm-C Energy Model for the building, researching possible conservation opportunities, organizing the audit into a comprehensive report, and making recommendations on mechanical, electrical and building envelope improvements. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 7 OF 22 Central Alaska Engineering Company (CAEC) began the site survey after completing the preliminary audit tasks noted in Section 2.0. The site survey provided critical input in deciphering where energy opportunities exist within the facility. The audit team walked the entire site to inventory the building envelope (roof, walls, windows and doors, etc.), the major equipment including HVAC, water heating, lighting, and equipment in the library, kitchen, offices, gymnasium, and classrooms. The site survey was used to determine an understanding of how the equipment is used. The collected data was entered into the AkWarm-C Commercial© Software (AkWarm-C), a building energy modeling program developed for Alaska Housing Finance Corporation (AHFC). The data was processed by AkWarm-C to model a baseline from which energy efficiency measures (EEMs) could be considered. The model was compared to actual utility costs to ensure the quality of baseline and proposed energy modeling performed by AkWarm-C. The recommended EEMs focus on the building envelope, HVAC systems, water heating, lighting, and other electrical improvements 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. When new equipment is proposed, energy consumption is calculated based on the manufacturer’s information where possible. Energy savings are calculated by AkWarm-C. 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 reduced operating schedule for specific inefficient lighting systems will result in a greater relative savings than merely replacing fixtures and bulbs. Implementing reduced operating schedules for newly installed efficient lighting will result in a lower relative savings, because there is less energy to be saved. If multiple EEM’s are recommended to be implemented, the combined savings is calculated and identified appropriately. Cost savings are calculated based on the historical energy costs for the building. Cost estimates were generated using the Program Demand Cost Model for Alaskan Schools, 12th Edition, Updated 2011, developed for the State of Alaska DOE, Education Support Services/Facilities. Renovations Projects Manual provides information on school renovation costs. The Geographic Area Cost Factor dated April 2011 for the Kodiak Island Borough School District has an index of 124.4 for the villages compared to Anchorage and was used in this report. Installation costs include design, labor, equipment, overhead and profit for school renovation projects and used to evaluate the initial investment required to implement an EEM. These are applied to each recommendation with simple paybacks calculated. In addition, where applicable, maintenance cost savings are estimated and applied to the net savings. The costs and savings are applied and a Simple Payback (SP) and Savings to Investment Ration (SIR) are calculated. These are listed in Section 7.0 and summarized in Tables 1.1 of this report. The SP is based on the years that it takes for the net savings to payback the net installation cost (Cost divided by Savings). The SIR is calculated as a ratio by dividing the break even cost by the initial installed cost. The lifetime for each EEM is estimated based on the typical life of the equipment being replaced or altered. The energy savings is extrapolated throughout the lifetime of the EEM. The total energy savings is calculated as the total lifetime multiplied by the yearly savings. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 8 OF 22 The 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 (usually inflationary) as projected by the Alaska Department of Energy are included in the model. 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 $50,000 and results in a savings of $5,000 a year, the payback time is 10 years. If the boiler has an expected life to replacement of 20 years, it would be financially viable to make the investment since the payback period of 10 years is less 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. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 9 OF 22 All results are dependent on the quality of input data provided. In this case the site investigation was limited to observable conditions. No testing or destructive investigations were undertaken. Although energy-conserving methods are described in the EEMs, in some instances several methods may also achieve the identified savings. Detailed engineering is required in order to develop the EEMs to a realizable project. This audit and report are thus intended to offer approximations of the results achievable by the listed improvements. This report is not intended to be a final design document. The design professional or other persons following the recommendations shall accept responsibility and liability for the results. 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, Larsen Bay School was modeled using AkWarm-C energy use software to establish a baseline space heating and cooling energy usage. Climate data for Larsen Bay, Alaska 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. Project cost estimates are provided in the Section 7.0 of this report reviewing the Energy Efficiency Measures. Limitations of the AkWarm-C Commercial© Software are reviewed in this section. The AkWarm-C model is based on typical mean year weather data for Larsen Bay, Alaska. This data represents the average ambient weather profile as observed over approximately 30 years. As such, the fuel oil 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. 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. AkWarm-C 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 were derived from the output generated by the AkWarm-C simulations. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 10 OF 22 The structure of the Larsen Bay School is a single story facility originally built in 1980 and received a classroom addition, boiler and DDC system upgrade in 1988. The school typically opens at 7AM by staff with faculty and student occupancy until 4PM during the weekdays. Additional occupancy time keeping the school open includes occasional after school programs and community events. There are an estimated 20 full time students, faculty, and staff occupants using the school. As architectural drawings were provided for the energy audit, shell insulation values were assumed using the provided information. No destructive testing was completed for the audit. The insulation values and conditions were modeled using the data provided in the architectural drawings. The following are the assumptions made for the AkWarm-C building model: Exterior walls of the building have double paned, wood framed windows with aluminum cladding in place which have an estimated U-factor of 0.63 Btu/hr-sf-F. Most of these windows appear to be in good condition given their age. All doors on this building are commercial grade, insulated and metal framed that are solid or have partial glass. The door assemblies appear worn but in adequate condition. The below floor exterior walls of the school consist of 6-inch all-weather wood walls filled with fiberglass batt and foam board installed as a sheathing providing an estimated R-23.1 composite value. The above grade wall sections are also built with 6-inch studs filled with fiberglass batt insulation providing an estimated R-17.5 composite value. Wall height varies from 12 feet to 30 feet, depending on location. The different wall constructions can be noted in the IR images provided in Appendix E of this report. The roof system of the school is a sloped cathedral ceiling insulated with fiberglass batt and foam insulation for an estimated average R-27.1 composite value. Heat is provided to the main school building by two (2) fuel oil-fired sectional boilers which were installed in 1988. The boilers are located in the building’s mechanical room. Heat is provided to the hydronic loops and heating coils on the supply air ducts routed to the various zones in the building. The heating plants used in the building are described as follows: Boiler’s 1-2 Fuel Type: Fuel Oil Input Rating: 781,000 Btu/hr Rated Efficiency: 80 % Heat Distribution Type: Hydronic (Glycol) Boiler Operation: All Year CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 11 OF 22 Domestic Hot Water (DHW) is supplied by one fuel oil fired hot water heater which was found to be shut-down due to it was leaking and in the process of being replaced with a new side-arm hot water maker. DHW is circulated 24/7 around the building and supplies hot water to the restrooms, showers, kitchen and various sinks in the building. Storage Water Heater Fuel Type: Fuel Oil Size: 119 Gallons Rated Efficiency: 70 % (estimated) Heat Distribution Type: Circulation 24/7 DHW Heater Operation: All Year There are 4 AHU’s operating in the school. The ventilation system uses electronically controlled end devices, controlled by a Barber Colman DDC system. Building exhaust systems appear to operate 24/7. This is where installation of variable speed controllers on the major ventilation fans and only operate while the school is occupied can provide significant energy savings. The outdoor air should never be provided at less than 10 CFM/occupant to be code compliant, but at even half capacity and at the current occupancy level, the system provides many more two times the required amount of outdoor air. Lowering running times, set-back temperature operation and variable speed controllers can provide significant energy savings for the school. There are several types of light systems throughout the building. The majority of the building uses old T12 lighting systems which are outdated and on the way to being phased out. The gym is recommended to be upgraded to the new T5HO lighting system with occupancy and daylight sensors with multi-level switching. The commons area is lit with 400W MH lights which are inefficient and good candidates for replacement. There have been recent advances in LED technology making it a viable option to replace this light. Several EEM’s are provided in this report reviewing the lighting system upgrade recommendations. There are several large plug loads throughout the building. This includes the kitchen equipment, shop equipment, computers with monitors, copy machine, refrigerators, microwave ovens and coffee pots. These building plug loads are estimated in the AkWarm-C modeling program at 0.1 watts/sf for the school. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 12 OF 22 Following the completion of the field survey a detailed building major equipment inventory was created and is attached as Appendix C. The equipment listed is considered to be the major energy consuming items in the building whose replacement or upgrade could yield substantial energy savings. An approximate age was assigned to the equipment if a manufactured date was not shown on the equipment’s nameplate. As listed in the 2011 ASHRAE Handbook for HVAC Applications, Chapter 37, Table 4, the service life for the equipment along with the remaining useful life in accordance to the ASHRAE standard are also noted in the equipment list. Where there are zero (0) years remaining in the estimated useful life of a piece of equipment, this is an indication that maintenance costs are likely on the rise and more efficient replacement equipment is available which will lower the operating costs of the unit. Maintenance costs should also fall with the replacement. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 13 OF 22 Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and fuel oil energy usage for the surveyed facility from July 2008 to June 2010. Larsen Bay city power provides the electricity under their large commercial rate schedules. Fuel Oil is provided by the local distributor under contract rate with the school district. The electric utility bills for consumption in kilowatt-hours (kWh) and for maximum demand in kilowatts (kW). One kilowatt-hour is equivalent to 3,413 Btu’s. The consumption (kWh) is determined as the wattage times the hours it is running. For example, 1,000 watts running for one hour, or 500 watts running for two hours is a kWh. The maximum demand is simply the sum of all electrical devices on simultaneously. For example, ten, 100 watt lights running simultaneously would create a demand of 1,000 watts (1 kW). Demand is averaged over a rolling window, usually 15 minutes. Thus, the facility must be concerned not only with basic electricity usage (consumption) but also the rate at which it gets used. The basic usage charges are shown as generation service and delivery charges along with several non-utility generation charges. Identify your school’s major equipment, know when it is used and work with staff to adjust time and duration of use. Also, consider using smart thermostats, relays, timers, on/off switches, and circuit breakers to shut down non-essential equipment and lights before starting equipment which draws a large amount of power. Relays or timers can prevent two large loads from being on at the same time. Peak demand can be best managed if first understood when it occurs. Know your school’s peak months, days and hours. Billing information can be used to acquire your benchmark data on the demand load and cost for the school building. Demand costs can be managed by scheduling times of the day when your electric usage is lowest to run equipment that uses the most power. You may want to pay special attention to equipment such as pumps, electric water heaters, 5-horsepower and larger motors, electric heat and commercial appliances. Most equipment has an identification tag or nameplate that lists the kW, or demand. Some tags may only list the amperage (amps and voltage the equipment uses). You can still use this information to figure the approximate usage rate in kilowatts. Multiply amps by volts and divide by 1,000 to get kilowatts. To help manage demand load and cost, install a special meter that records 15 minute load profile information, allowing you to view the electric power consumption over time. This data can help in determining when the peak loads occur. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 14 OF 22 The fuel oil usage profile shows the predicted fuel oil energy usage for the building. As actual fuel oil usage records were available, the model used to predict usage was calibrated to approximately match actual usage. Fuel oil is sold to the customer in units of gallons (GAL), which contains approximately 140,000 BTUs of energy. The average billing rates for energy use are calculated by dividing the total cost by the total usage. Based on the electric and fuel oil utility data provided for the 2009 and 2010 fiscal years, costs for the energy and consumption at the surveyed facility are summarized in Tables 6.1 below. 2009 2010 Average School Electric 0.31 $/kWh 0.32 $/kWh 0.32 $/kWh School Fuel Oil 6.02 $/GAL 4.82 $/GAL 5.42 $/GAL School Total Cost $87,793 $79,560 $83,677 School ECI 4.40 $/sf 3.99 $/sf 4.20 $/sf School Electric EUI 17.1 kBtu/sf 17.6 kBtu/sf 17.4 kBtu/sf School Fuel Oil EUI 62.8 kBtu/sf 64.7 kBtu/sf 63.8 kBtu/sf School Building EUI 79.9 kBtu/sf 82.2 kBtu/sf 81.1 kBtu/sf Data from the U.S.A. Energy Information Administration provides information for U.S.A. Commercial Buildings Energy Intensity Using Site Energy by Census Region. In 2003, the U.S.A. average energy usage for Education building activity is shown to be 83 kBtu/sf. For reference, data from the ARRA funded utility benchmark survey for the subject fiscal years completed on 84 schools in the Anchorage School District computed an average EUI of 106.5 kBtu/sf, and ECI of 1.77 $/sf, with an average building size of 86,356 square feet. Over the analyzed period, the surveyed facility was calculated to have an average EUI of 81.1 kBtu/sf for the school. This means the school uses a total of 2.29% less energy than the US average and 23.8% less energy than the Anchorage School District on a square foot basis. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 15 OF 22 At current utility rates, the Kodiak Island Borough School District is modeled to pay approximately $86,030 annually for electricity and fuel costs for the Larsen Bay School. Figure 6.1 below reflects the estimated distribution of costs across the primary end uses of energy based on the AkWarm-C 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 6.2 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. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 16 OF 22 Figure 6.3 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. The table below show AkWarm-C ’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. Electrical Consumption (kWh) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Lighting 4171 3801 4171 4037 2693 869 898 2060 4037 4171 4037 2050 Refrigeration 611 557 611 591 611 591 611 611 591 611 591 611 Other Electrical 166 151 166 161 103 25 26 75 161 166 161 75 Ventilation Fans 1974 1799 1974 1910 1200 125 129 784 1910 1974 1910 909 DHW 269 245 269 260 269 260 269 269 260 269 260 269 Space Heating 3341 3045 3339 3228 3331 3220 3325 3325 3222 3334 3231 3340 Space Cooling 0 0 0 0 0 0 0 0 0 0 0 0 Fuel Oil #2 Consumption (Gallons) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec DHW 80 73 80 78 80 78 80 80 78 80 78 80 Space Heating 1120 1071 1022 798 586 326 230 233 446 755 977 1055 CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 17 OF 22 Energy Utilization 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 thousands of British Thermal Units (or kBtu’s), 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 6.4 below for details): Building Site EUI = (Electric Usage in kBtu + Fuel Oil Usage in kBtu) Building Square Footage Building Source EUI = (Electric Usage in kBtu X SS Ratio + Fuel Oil Usage in kBtu X SS Ratio) Building Square Footage where “SS Ratio” is the Source Energy to Site Energy ratio for the particular fuel. Energy Type Building Fuel Use per Year Site Energy Use per Year, kBtu Source/Site Ratio Source Energy Use per Year, kBtu Electricity 104,675 kWh 357,254 3.340 1,193,229 #2 Oil 9,564 gallons 1,319,871 1.010 1,333,070 Total 1,677,125 2,526,299 BUILDING AREA 19,945 Square Feet BUILDING SITE EUI 82 kBtu/Ft²/Yr BUILDING SOURCE EUI 127 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. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 18 OF 22 The Energy Efficiency Measures for the school building are summarized below: Electrical & Appliance Measures The goal of this section is to present lighting energy efficiency measures that may 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. Rank Location Existing Condition Recommendation 3 Common 400W MH 6 MH 400 Watt Magnetic with Manual Switching Replace with 6 LED (3) 115W Module StdElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch and Improve Daylight Sensor Installation Cost $7,200 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $574 Maintenance Savings ($/yr) $760 Breakeven Cost $15,816 Savings-to-Investment Ratio 2.2 Simple Payback (yrs) 13 Auditors Notes: This EEM recommends replacement of the 400 MH lights in the commons with a modern efficient LED lighting system. Installation of the more efficient lights and installation of a lighting control package with occupancy sensors and multi- level switching can reduce the commons lighting energy consumption. Rank Location Existing Condition Recommendation 4 Gym 8' 2 bulb T12 16 FLUOR (2) T12 8' F96T12 75W Standard Magnetic with Manual Switching Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi- Level Switch Installation Cost $17,600 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $1,710 Maintenance Savings ($/yr) $1,500 Breakeven Cost $37,991 Savings-to-Investment Ratio 2.2 Simple Payback (yrs) 10 Auditors Notes: This EEM recommends replacement of the gym lights with a modern efficient T5 High Output system. Installation of the more efficient lights and installation of a lighting control package with occupancy sensors and multi-level switching can reduce the gym lighting energy consumption. Below is an example picture of a recently re-lamped elementary gym showing the T5 HO light system. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 19 OF 22 Rank Location Existing Condition Recommendation 8 Various 4' 3 bulb T12 20 FLUOR (3) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 20 FLUOR (3) T8 4' F32T8 28W Energy-Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch Installation Cost $14,500 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $1,150 Maintenance Savings ($/yr) $900 Breakeven Cost $24,256 Savings-to-Investment Ratio 1.7 Simple Payback (yrs) 13 Auditors Notes: This EEM is recommending the existing 40-Watt T12 lights in the building be replaced with 28-Watt Energy Saver T8 bulbs and programmable start ballasts. Additionally, these lights should be installed with occupancy sensors and controls for daylight harvesting. Rank Location Existing Condition Recommendation 9 Various 4' 2 bulb T12 106 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 106 FLUOR (2) T8 4' F32T8 28W Energy-Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch and Improve On/Off Photoswitch Installation Cost $59,100 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $3,463 Maintenance Savings ($/yr) $3,500 Breakeven Cost $82,458 Savings-to-Investment Ratio 1.4 Simple Payback (yrs) 17 Auditors Notes: See EEM #8 for similar note. Rank Location Existing Condition Recommendation 10 Shop 8' 3 bulb T12 10 FLUOR (3) T12 8' F96T12 75W Standard Magnetic with Manual Switching Replace with 10 FLUOR (3) T8 8' F96T8 54W Energy-Saver HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi-Level Switch Installation Cost $15,000 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $974 Maintenance Savings ($/yr) $750 Breakeven Cost $20,396 Savings-to-Investment Ratio 1.4 Simple Payback (yrs) 15 Auditors Notes: This EEM is recommending the existing 8 foot 75-Watt T12 lights in the shop be replaced with 54-Watt Energy Saver T8 bulbs and programmable start ballasts. Additionally, these lights should be installed with occupancy sensors and controls for daylight harvesting. Rank Location Description of Existing Efficiency Recommendation 6 Combined Refrigeration 4 Refrigeration Replace with 4 Refrigeration and Add new Seasonal Shutdown Installation Cost $5,200 Estimated Life of Measure (yrs)20 Energy Savings ($/yr) $691 Breakeven Cost $10,099 Savings-to-Investment Ratio 1.9 Simple Payback (yrs) 8 Auditors Notes: This EEM evaluates the practice of beginning seasonal shutdown procedures of the various refrigeration systems throughout the building, including the kitchen and break room refrigerators. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 20 OF 22 Night Setback Thermostat Measures Heating & Domestic Hot Water Measure Rank Building Space Recommendation 2 School Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the School space. Installation Cost $23,000 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $10,821 Breakeven Cost $146,901 Savings-to-Investment Ratio 6.4 Simple Payback (yrs) 2 Auditors Notes: There are economic reasons why the thermostatic controller set points should be setback during off peak use hours. However one important control data input concerns the water dew point of the air. The water dew point of the inside air varies with the seasons. Currently, there is no humidity measuring instruments normally available to or monitored by the control system or staff and this data is needed before choosing the ideal “setback” temperatures which varies with the season. As outside air temperatures rise, the inside air dew point also rises. The staff is likely to complain about mildew and mold smells if the temperature is dropped below the dew point and condensation occurs. In keeping with this mildew and mold concern, it is recommended that the control system monitor the water dew point within the building to select how far back the temperature can be set during low use periods. If the water dew point is above 70 oF, then set up the temperature not back. If the water dew point is 50 oF or below, then reduce the setback temperature control toward 60oF. Other parameters relating to the building setback temperature include warm-up time required to reheat the building and preventing any water pipes near the building perimeter from freezing. During extreme cold periods, reducing the setback temperature limit and time appropriately is required to prevent possible problems. Rank Recommendation 7 Implement a reduced run time scheme through DDC controls for boilers, motors and DHW to reduce heat wasted during unoccupied hours ($7,500). Install timer controls with DDC system on DWH circulation pumps to shut-off during non-occupied times ($7,500). Install new side-arm DHW maker in place of existing broken fuel oil fired water heater ($12,500). Installation Cost $14,500 Estimated Life of Measure (yrs)25 Energy Savings ($/yr) $947 Maintenance Savings ($/yr) $450 Breakeven Cost $25,634 Savings-to-Investment Ratio 1.8 Simple Payback (yrs) 15 Auditors Notes: Implementing a reduced operating time scheme for the pumps throughout the heating water distribution system will reduce the amount of power used by motors during non-critical times of the day. This EEM also includes the replacement of the broken oil fired domestic hot water heater with an 80 gallon side-arm indirect fired hot water maker and the two DHW recirculation pumps be installed with timer controls to shut-down the pumps during unoccupied hours. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 21 OF 22 Ventilation System Measure Building Shell Measures Rank Description Recommendation 5 Install premium motors and variable speed controllers on 4 AHUs Installation Cost $32,600 Estimated Life of Measure (yrs)15 Energy Savings ($/yr) $4,944 Breakeven Cost $65,225 Savings-to-Investment Ratio 2.0 Simple Payback (yrs) 7 Auditors Notes: * The cost of upgrading the ventilation system was allocated across several of the mechanical energy efficiency measures. The recommendations of this EEM include several retrofit options. AkWarm-C considers all upgrades to the ventilation system as one item and therefore predicts a combined savings. Because of this, the savings of individual upgrades do not directly compare to the predicted overall savings of a complete upgrade of the building ventilation system. A. The programming of ventilation equipment to cycle on and off during low use periods has the potential to save a portion of the total electric power cost. This can be done with no noticeable difference to the occupants of the building, which is vacant or near vacant during low use periods. There is no need for fresh air when the building is vacant. B. Installation of high efficiency premium motors and variable speed controllers on the AHU’s will allow the motors to be operated more efficiently to match the load output requirements. Rank Location Existing Type/R-Value Recommendation Type/R-Value 1 Below-Grade Floor, Perimeter: BGFP Insulation for 0' to 2' Perimeter: None Insulation for 2' to 4' Perimeter: None Modeled R-Value: 12.4 Install R-19 Fiberglass Batts on the Perimeter 2 feet of the Crawl Space Floor. Installation Cost $2,094 Estimated Life of Measure (yrs)30 Energy Savings ($/yr) $1,141 Breakeven Cost $27,060 Savings-to-Investment Ratio 12.9 Simple Payback (yrs) 2 Auditors Notes: Addition of insulation to the perimeter of the floor area of the crawlspace will greatly help with heat retention in the building. A well fitted vapor barrier on the floor of the crawlspace will help the fiberglass batt to last longer and reduce undesirable moisture from entering the crawlspace area. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT AkWarm ID No. KONI‐ADQ‐CAEC‐08 PAGE 22 OF 22 Through inspection of the energy-using equipment on-site and discussions with site facilities personnel, this energy audit has identified several energy-saving measures. The measures will reduce the amount of fuel burned and electricity used at the site. The projects will not degrade the performance of the building and, in some cases, will improve it. Several types of EEMs can be implemented immediately by building staff, and others will require various amounts of lead time for engineering and equipment acquisition. In some cases, there are logical advantages to implementing EEMs concurrently. For example, if the same electrical contractor is used to install both lighting equipment and motors, implementation of these measures should be scheduled to occur simultaneously. The Alaska Housing Finance Corporation (AHFC) Alaska Energy Efficiency Revolving Loan Fund (AEERLF) is a State of Alaska program enacted by the Alaska Sustainable Energy Act (Senate Bill 220, A.S. 18.56.855, “Energy Efficiency Revolving Loan Fund”). The AEERLF will provide loans for energy efficiency retrofits to public facilities via the Retrofit Energy Assessment for Loan System (REAL). As defined in 15 AAC 155.605, the program may finance energy efficiency improvements to buildings owned by: a. Regional educational attendance areas; b. Municipal governments, including political subdivisions for municipal governments; c. The University of Alaska; d. Political subdivisions of the State of Alaska, or e. The State of Alaska Refer to the Retrofit Energy Assessment for Loans manual which can be obtained from AHFC for more information on this program. CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX A Appendix A Energy Benchmark Data Report CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL First Name Last Name Middle Name Phone Gregg Hacker 481‐2288 State Zip AK 99615 Monday‐ Friday Saturday Sunday Holidays 7:00‐5:00 Average # of Occupants During 20 Renovations Date 01/01/1988 PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton Other energy sources? 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. Contact Person Email ghacker01@kibsd.org Mailing Address City 722 Mill Bay Rd Kodiak Primary Operating Hours Details School classroom addition. Facility Address Facility City Facility Zip Larsen Bay School Drive Larsen Bay 99624 Building Type Community Population Year Built Mixed 79 1980 Building Name/ Identifier Building Usage Building Square Footage Larsen Bay School Education ‐ K ‐ 12 19,945 Kodiak Island Borough Regional Education Attendance 06/15/12 REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner Facility Owned By Date APPENDIX A CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL Larsen Bay School Buiding Size Input (sf) =19,945 2009 Natural Gas Consumption (Therms)0.00 2009 Natural Gas Cost ($)0 2009 Electric Consumption (kWh)99,962 2009 Electric Cost ($)30,657 2009 Oil Consumption (Therms)12,528.12 2009 Oil Cost ($)57,136 2009 Propane Consumption (Therms)0.00 2009 Propane Cost ($)0.00 2009 Coal Consumption (Therms)0.00 2009 Coal Cost ($)0.00 2009 Wood Consumption (Therms)0.00 2009 Wood Cost ($)0.00 2009 Thermal Consumption (Therms)0.00 2009 Thermal Cost ($)0.00 2009 Steam Consumption (Therms)0.00 2009 Steam Cost ($)0.00 2009 Total Energy Use (kBtu)1,593,982 2009 Total Energy Cost ($)87,793 Annual Energy Use Intensity (EUI) 2009 Natural Gas (kBtu/sf) 0.0 2009 Electricity (kBtu/sf)17.1 2009 Oil (kBtu/sf) 62.8 2009 Propane (kBtu/sf) 0.0 2009 Coal (kBtu/sf) 0.0 2009 Wood (kBtu/sf) 0.0 2009 Thermal (kBtu/sf) 0.0 2009 Steam (kBtu/sf) 0.0 2009 Energy Utilization Index (kBtu/sf)79.9 Annual Energy Cost Index (ECI) 2009 Natural Gas Cost Index ($/sf)0.00 2009 Electric Cost Index ($/sf)1.54 2009 Oil Cost Index ($/sf)2.86 2009 Propane Cost Index ($/sf)0.00 2009 Coal Cost Index ($/sf)0.00 2009 Wood Cost Index ($/sf)0.00 2009 Thermal Cost Index ($/sf)0.00 2009 Steam Cost Index ($/sf)0.00 2009 Energy Cost Index ($/sf)4.40 APPENDIX A CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL 2010 Natural Gas Consumption (Therms)0.00 2010 Natural Gas Cost ($)0 2010 Electric Consumption (kWh)102,664 2010 Electric Cost ($)32,438 2010 Oil Consumption (Therms)12,898.64 2010 Oil Cost ($)47,122 2010 Propane Consumption (Therms)0.00 2010 Propane Cost ($)0 2010 Coal Consumption (Therms)0.00 2010 Coal Cost ($)0 2010 Wood Consumption (Therms)0.00 2010 Wood Cost ($)0 2010 Thermal Consumption (Therms)0.00 2010 Thermal Cost ($)0 2010 Steam Consumption (Therms)0.00 2010 Steam Cost ($)0 2010 Total Energy Use (kBtu)1,640,257 2010 Total Energy Cost ($)79,560 Annual Energy Use Intensity (EUI) 2010 Natural Gas (kBtu/sf)0.0 2010 Electricity (kBtu/sf)17.6 2010 Oil (kBtu/sf)64.7 2010 Propane (kBtu/sf)0.0 2010 Coal (kBtu/sf)0.0 2010 Wood (kBtu/sf)0.0 2010 Thermal (kBtu/sf)0.0 2010 Steam (kBtu/sf)0.0 2010 Energy Utilization Index (kBtu/sf)82.2 Annual Energy Cost Index (ECI) 2010 Natural Gas Cost Index ($/sf)0.00 2010 Electric Cost Index ($/sf)1.63 2010 Oil Cost Index ($/sf)2.36 2010 Propane Cost Index ($/sf)0.00 2010 Coal Cost Index ($/sf)0.00 2010 Wood Cost Index ($/sf)0.00 2010 Thermal Cost Index ($/sf)0.00 2010 Steam Cost Index ($/sf)0.00 20010 Energy Cost Index ($/sf)3.99 Note: 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's APPENDIX A CENTRAL ALASKA ENGINEERING COMPANYKIBSD LARSEN BAY SCHOOLLarsen Bay SchoolElectricityBtus/kWh =3,413Provider Customer #Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)KEA 100.373.606 Jul‐08 7/1/2008 7/31/2008 31 2,262 77 $683 $0.30KEA 100.373.606 Aug‐08 8/1/2008 8/31/2008 31 7,693 263 $2,325 $0.30KEA 100.373.606 Sep‐08 9/1/2008 9/30/2008 30 10,176 347 $3,078 $0.30KEA 100.373.606 Oct‐08 10/1/2008 10/31/2008 31 9,733 332 $2,920 $0.30KEA 100.373.606 Nov‐08 11/1/2008 11/30/2008 30 10,361 354 $3,108 $0.30KEA 100.373.606 Dec‐08 12/1/2008 12/31/2008 31 9,990 341 $3,017 $0.30KEA 100.373.606 Jan‐09 1/1/2009 1/31/2009 31 10,151 346 $3,086 $0.30KEA 100.373.606 Feb‐09 2/1/2009 2/28/2009 28 8,741 298 $2,883 $0.33KEA 100.373.606 Mar‐09 3/1/2009 3/31/2009 31 9,579 327 $2,945 $0.31KEA 100.373.606 Apr‐09 4/1/2009 4/30/2009 30 10,014 342 $3,059 $0.31KEA 100.373.606 May‐09 5/1/2009 5/31/2009 31 8,316 284 $2,632 $0.32KEA 100.373.606 Jun‐09 6/1/2009 6/30/2009 30 2,946 101 $923 $0.31KEA 100.373.606 Jul‐09 7/1/2009 7/31/2009 31 5,895 201 $1,799 $0.31KEA 100.373.606 Aug‐09 8/1/2009 8/31/2009 31 4,748 162 $1,553 $0.33KEA 100.373.606 Sep‐09 9/1/2009 9/30/2009 30 6,084 208 $1,907 $0.31KEA 100.373.606 Oct‐09 10/1/2009 10/31/2009 31 10,444 356 $3,186 $0.31KEA 100.373.606 Nov‐09 11/1/2009 11/30/2009 30 10,853 370 $3,313 $0.31KEA 100.373.606 Dec‐09 12/1/2009 12/31/2009 31 9,518 325 $2,909 $0.31KEA 100.373.606 Jan‐10 1/1/2010 1/31/2010 31 8,068 275 $2,461 $0.31KEA 100.373.606 Feb‐10 2/1/2010 2/28/2010 28 10,326 352 $3,159 $0.31KEA 100.373.606 Mar‐10 3/1/2010 3/31/2010 31 10,021 342 $3,121 $0.31KEA 100.373.606 Apr‐10 4/1/2010 4/30/2010 30 12,271 419 $4,041 $0.33KEA 100.373.606 May‐10 5/1/2010 5/31/2010 31 10,177 347 $3,388 $0.33KEA 100.373.606 Jun‐10 6/1/2010 6/30/2010 30 4,259 145 $1,603 $0.38Jan ‐ 09 to Dec ‐ 09 total:99,9623,412$30,657Jan ‐ 10 to Dec ‐ 10 total:102,6643,504$32,438$0.31$0.32Jan ‐ 10 to Dec ‐ 10 avg:Jan ‐ 09 to Dec ‐ 09 avg:APPENDIX A CENTRAL ALASKA ENGINEERING COMPANYKIBSD LARSEN BAY SCHOOL$0$500$1,000$1,500$2,000$2,500$3,000$3,500$4,000$4,50002,0004,0006,0008,00010,00012,00014,000Electric Cost ($)Electric Consumption (kWh)Date (Mon ‐Yr)Larsen Bay School ‐Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption(kWh)Electric Cost ($)APPENDIX A CENTRAL ALASKA ENGINEERING COMPANYKIBSD LARSEN BAY SCHOOLLarsen Bay SchoolOilBtus/Gal =132,000Provider Customer #Month Start Date End Date Billing Days Consumption (Gal) Consumption (Therms) Demand Use Oil Cost ($) Unit Cost ($/Therm) Demand Cost ($)100.373.606 Jul‐08 7/1/2008 7/31/2008 31 0 0 $0 0.00100.373.606 Aug‐08 8/1/2008 8/31/2008 31 0 0 $0 0.00100.373.606 Sep‐08 9/1/2008 9/30/2008 30 0 0 $0 0.00100.373.606 Oct‐08 10/1/2008 10/31/2008 31 0 0 $0 0.00100.373.606 Nov‐08 11/1/2008 11/30/2008308001,056$4,8164.56100.373.606 Dec‐08 12/1/2008 12/31/2008311,7002,244$10,2344.56100.373.606 Jan‐09 1/1/2009 1/31/2009312,2873,019$13,7684.56100.373.606 Feb‐09 2/1/2009 2/28/2009281,0961,447$6,5984.56100.373.606 Mar‐09 3/1/2009 3/31/2009311,4391,899$8,6634.56100.373.606 Apr‐09 4/1/2009 4/30/2009301,5182,004$9,1384.56100.373.606 May‐09 5/1/2009 5/31/200931651859$3,9194.56100.373.606 Jun‐09 6/1/2009 6/30/20093000$00.00100.373.606 Jul‐09 7/1/2009 7/31/20093100$00.00100.373.606 Aug‐09 8/1/2009 8/31/20093100$00.00100.373.606 Sep‐09 9/1/2009 9/30/200930402531$2,3204.37100.373.606 Oct‐09 10/1/2009 10/31/2009311,0101,333$5,8284.37100.373.606 Nov‐09 11/1/2009 11/30/200930743980$3,4793.55100.373.606 Dec‐09 12/1/2009 12/31/2009311,8002,376$8,3883.53100.373.606 Jan‐10 1/1/2010 1/31/2010311,3491,781$6,2863.53100.373.606 Feb‐10 2/1/2010 2/28/201028481635$2,2413.53100.373.606 Mar‐10 3/1/2010 3/31/2010311,6842,223$7,8473.53100.373.606 Apr‐10 4/1/2010 4/30/2010301,0351,366$4,8233.53100.373.606 May‐10 5/1/2010 5/31/2010318251,089$3,8453.53100.373.606 Jun‐10 6/1/2010 6/30/201030443585$2,0643.53Jan ‐ 09 to Dec ‐ 09 total:9,491 12,528 $57,136 $0Jan ‐ 10 to Dec ‐ 10 total:9,772 12,899 $47,122 $0Jan ‐ 09 to Dec ‐ 09 avg:4.56$6.02Jan ‐ 10 to Dec ‐ 10 avg:3.65$4.82APPENDIX A CENTRAL ALASKA ENGINEERING COMPANYKIBSD LARSEN BAY SCHOOL$0.00$2,000.00$4,000.00$6,000.00$8,000.00$10,000.00$12,000.00$14,000.00$16,000.0005001,0001,5002,0002,5003,0003,500Oil Cost ($)Oil Consumption (Therms)Date (Mon ‐Yr)Larsen Bay School ‐Oil Consumption (Therms) vs. Oil Cost ($)Oil Consumption(Therms)Oil Cost ($)APPENDIX A CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL K‐12 ENERGY AUDIT REPORT APPENDIX B Appendix B Short AK-Warm Report Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Larsen Bay School Page 1 ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 6/28/2012 9:58 AM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Larsen Bay School Auditor Company: Central Alaska Engineering Co. Address: Larsen Bay School Drive Auditor Name: Jerry P. Herring, PE, CEA City: Larsen Bay Auditor Address: 32215 Lakefront Dr. Soldotna, AK 99669 Client Name: Gregg Hacker Client Address: 722 Mill Bay Rd Kodiak, AK 99615 Auditor Phone: (907) 260‐5311 Auditor FAX: ( ) ‐ Client Phone: (907) 481‐2288 Auditor Comment: Client FAX: ( ) ‐ Design Data Building Area: 19,945 square feet Design Heating Load: Design Loss at Space: 265,541 Btu/hour with Distribution Losses: 270,960 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 413,048 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 20 people Design Indoor Temperature: 72 deg F (building average) Actual City: Larsen Bay Design Outdoor Temperature: 11.3 deg F Weather/Fuel City: Larsen Bay Heating Degree Days: 9,065 deg F‐days Utility Information Electric Utility: Larsen Bay Electric ‐ Commercial ‐ Lg Fuel Oil Provider: Local Provider Average Annual Cost/kWh: $0.320/kWh Average Annual Cost/Gal: $5.42/Gal Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrige ration Other Electric al Cooking Clothes Drying Ventilatio n Fans Service Fees Total Cost Existing Building $62,294 $0 $3,824 $11,838 $2,304 $459 $0 $0 $5,311 $0 $86,030 With Proposed Retrofits $45,413 $0 $3,844 $3,967 $1,613 $459 $0 $0 $4,277 $0 $59,573 SAVINGS $16,880 $0 ‐$20 $7,871 $691 $0 $0 $0 $1,034 $0 $26,457 Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Larsen Bay School Page 2 $0 $20,000 $40,000 $60,000 $80,000 $100,000 Existing Retrofit Ventilation and Fans Space Heating Refrigeration Other Electrical Lighting Domestic Hot Water Annual Energy Costs by End Use Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Larsen Bay School Page 3 PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 1 On‐ or Below‐Grade Floor, Perimeter: BGFP Install R‐19 Fiberglass Batts on the Perimeter 2 feet of the Crawl Space Floor. $1,142 $2,094 12.94 1.8 2 Setback Thermostat: School Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the School space. $11,612 $23,000 6.85 2 3 Lighting ‐ Combined Retrofit: Common 400W MH Replace with 6 LED (3) 115W Module StdElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch and Improve Daylight Sensor $574 + $760 Maint. Savings $7,200 2.20 12.5 4 Lighting ‐ Combined Retrofit: Gym 8' 2 bulb T12 Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch $1,710 + $1,500 Maint. Savings $17,600 2.16 10.3 5 Refrigeration ‐ Combined Retrofit: Combined Refrigeration Replace with 4 Refrigeration and Add new Seasonal Shutdown $691 $5,200 1.94 7.5 6 Ventilation Install premium motors and variable speed controllers on 4 AHUs $4,699 $32,600 1.90 6.9 7 Lighting ‐ Combined Retrofit: Various 4' 3 bulb T12 Replace with 20 FLUOR (3) T8 4' F32T8 28W Energy‐ Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch $1,150 + $900 Maint. Savings $14,500 1.67 12.6 8 Lighting ‐ Combined Retrofit: Various 4' 2 bulb T12 Replace with 106 FLUOR (2) T8 4' F32T8 28W Energy‐Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch and Improve On/Off Photoswitch $3,463 + $3,500 Maint. Savings $59,100 1.40 17.1 Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Larsen Bay School Page 4 PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 9 Lighting ‐ Combined Retrofit: Shop 8' 3 bulb T12 Replace with 10 FLUOR (3) T8 8' F96T8 54W Energy‐ Saver HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐ Level Switch $974 + $750 Maint. Savings $15,000 1.36 15.4 10 HVAC And DHW Implement a reduced run time scheme through DDC controls for boilers, motors and DHW to reduce heat wasted during unoccupied hours ($9,500). Install timer controls with DDC system on DWH circulation pump to shut‐off during non‐ occupied times ($5,000). $441 + $450 Maint. Savings $14,500 1.17 32.9 TOTAL $26,457 + $7,860 Maint. Savings $190,794 2.38 7.2 ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS 1. Building Envelope Insulation Rank Location Existing Type/R-Value Recommendation Type/R- Value Installed Cost Annual Energy Savings 1 On‐ or Below‐ Grade Floor, Perimeter: BGFP Insulation for 0' to 2' Perimeter: None Insulation for 2' to 4' Perimeter: None Modeled R‐Value: 12.4 Install R‐19 Fiberglass Batts on the Perimeter 2 feet of the Crawl Space Floor. $2,094 $1,142 Exterior Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Larsen Bay School Page 5 Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 2. Mechanical Equipment Mechanical Rank Recommendation Installed Cost Annual Energy Savings 10 Implement a reduced run time scheme through DDC controls for boilers, motors and DHW to reduce heat wasted during unoccupied hours ($9,500). Install timer controls with DDC system on DWH circulation pump to shut‐off during non‐ occupied times ($5,000). $14,500 $441 + $450 Maint. Savings Setback Thermostat Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 2 School Existing Unoccupied Heating Setpoint: 70.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the School space. $23,000 $11,612 Ventilation Rank Recommendation Cost Annual Energy Savings 6 Install premium motors and variable speed controllers on 4 AHUs $32,600 $4,699 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 3 Common 400W MH 6 MH 400 Watt Magnetic with Manual Switching Replace with 6 LED (3) 115W Module StdElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch and Improve Daylight Sensor $7,200 $574 + $760 Maint. Savings 4 Gym 8' 2 bulb T12 16 FLUOR (2) T12 8' F96T12 75W Standard Magnetic with Manual Switching Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch $17,600 $1,710 + $1,500 Maint. Savings Energy Audit – Energy Analysis and Cost Comparison AkWarm Commercial Audit Software Larsen Bay School Page 6 7 Various 4' 3 bulb T12 20 FLUOR (3) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 20 FLUOR (3) T8 4' F32T8 28W Energy‐ Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch $14,500 $1,150 + $900 Maint. Savings 8 Various 4' 2 bulb T12 106 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 106 FLUOR (2) T8 4' F32T8 28W Energy‐ Saver Program HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐Level Switch and Improve On/Off Photoswitch $59,100 $3,463 + $3,500 Maint. Savings 9 Shop 8' 3 bulb T12 10 FLUOR (3) T12 8' F96T12 75W Standard Magnetic with Manual Switching Replace with 10 FLUOR (3) T8 8' F96T8 54W Energy‐ Saver HighEfficElectronic and Remove Manual Switching and Add new Occupancy Sensor, Multi‐ Level Switch $15,000 $974 + $750 Maint. Savings Refrigeration Rank Location Existing Recommended Installed Cost Annual Energy Savings 5 Combined Refrigeration 4 Refrigeration Replace with 4 Refrigeration and Add new Seasonal Shutdown $5,200 $691 Other Electrical Equipment Rank Location Existing Recommended Installed Cost Annual Energy Savings Cooking/Clothes Drying Rank Recommended Installed Cost Annual Energy Savings ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ AkWarmCalc Ver 2.2.0.3, Energy Lib 5/18/2012 CENTRAL ALASKA ENGINEERING COMPANY LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX C Appendix C Major Equipment List CENTRAL ALASKA ENGINEERING COMPANYKIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORTTAG LOCATIONFUNCTIONMAKEMODELTYPECAPACITY EFFICIENCY MOTOR SIZEASHRAE SERVICE LIFEESTIMATED REMAINING USEFUL LIFENOTESB-1 BOILER ROOM BUILDING HEAT WEIL-MCLAIN BL976WS OIL/SECTIONAL 781 MBH 80% - 35 11 1988B-2 BOILER ROOM BUILDING HEAT WEIL-MCLAIN BL976WS OIL/SECTIONAL 781 MBH 80% - 35 11 1988HWH-1 BOILER ROOM DHW HEATER NICKELSHIELD WH-9LDW SHELL&TUBE 119 GALLONS 65% - 20 18CP-1A BOILER ROOM BLDG HEAT CIRCULATION GRUNDFOS UPC 65-160 INLINE 57 GPM @ 25' 70% 1800 W 10 2CP-1B BOILER ROOM BLDG HEAT CIRCULATION GRUNDFOS UPC 65-160 INLINE 57 GPM @ 25' 70% 1800 W 10 0CP-2A BOILER ROOM BLDG HEAT CIRCULATION GRUNDFOS UPC 50-160 INLINE 56 GPM @ 22' 70% 1150 W 10 2CP-2B BOILER ROOM BLDG HEAT CIRCULATION GRUNDFOS UPC 50-160 INLINE 56 GPM @ 22' 70% 1150 W 10 0CP-3 BOILER ROOM DHW CIRC PUMP KITCHEN GRUNDFOS UP 25-64 SF INLINE 5 GPM @ 5' 70% 180 W 10 6CP-4 BOILER ROOM DHW CIRC PUMP SHOWERS GRUNDFOS UP 25-64 SF INLINE 5 GPM @ 5' 70% 180 W 10 2AHU-1 CLASS ROOMS VENTILATION/HEAT TRANE 8A HORIZONTAL 3600 CFM @ 1.0" 80% 1.5 HP 25 3AHU-2 GYMNASIUM VENTILATION/HEAT JACK & CHURCH 20-02FHRH HORIZONTAL 2600 CFM @ 1.0" 72% 3.0 HP 25 0 CONVERTED FURNACEAHU-3 GYMNASIUM VENTILATION/HEAT JACK & CHURCH 20-02FHRH HORIZONTAL 2600 CFM @ 1.0" 72% 3.0 HP 25 0 CONVERTED FURNACEAHU-4 GYMNASIUM VENTILATION/HEAT JACK & CHURCH 20-02FHRH HORIZONTAL 2600 CFM @ 1.0" 72% 3.0 HP 25 0 CONVERTED FURNACETEF-1 CEILING TOILET ROOM PENN ZT-10 CENTRIFIGUL 88 CFM @ 0.125" 70% 48 WATTS 20 0TEF-2 CEILING TOILET ROOM PENN ZT-11 CENTRIFIGUL 365 CFM @ 0.25" 70% 130 WATTS 20 0TEF-3 CEILING TOILET ROOM PENN ZT-10 CENTRIFIGUL 160 CFM @ 0.375" 70% 105 WATTS 20 0EF-1 CEILING CLASSROOMS PENN Z11TDS CENTRIFIGUL 648 CFM @ 0.25" 70% 280 WATTS 20 0EF-2 CEILING CLASSROOMS PENN Z9TDS CENTRIFIGUL 356 CFM @ 0.125" 70% 130 WATTS 20 0EF-3 KITCHEN KITCHEN EXHAUST GREENHECK CUBE-10 CENTRIFIGUL 734 CFM @ 0.25" 72% 186 WATTS 20 0EF-4 CEILING LIBRARY PENN Z12RA CENTRIFIGUL 830 CFM @ 0.25" 70% 280 WATTS 20 0EF-5 CEILING COMMONS PENN Z8TD CENTRIFIGUL 220 CFM @ 0.125" 70% 105 WATTS 20 0PF-1 CEILING GYM NUTONE PFM-52 PADDLE FAN 4300 CFM 80% 80 WATTS 20 0MAJOR EQUIPMENT INVENTORYAPPENDIX C CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX D Appendix D Site Visit Photos CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX D 1. East facing view of the Gym section added in 1988. 2. South facing view of the classroom section of the school. 3. View of the North facing metal clad wood framed windows typical for the school. 4. Main entrance door assembly. 5. View of the South facing metal clad wood framed windows. 6. Emergency exit from the commons area used as the kitchen entrance. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX D 7. Example of school’s atomic exit signs. Some were found to be expired. 8. Interior T12 light fixtures typical of school shop area. 9. Interior T12 light fixtures typical of school hallway. 10. View of the T12 light fixtures in the classrooms. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX D 11. View of the fuel oil fired boilers in the school. 12. Beckett burner assembly. 13. 1988 oil fired DHW heater. 14. The hot water heater was found to be in poor condition and leaking indicating the unit is beyond its useful life and is recommended to be replaced with a side-arm DHW maker using the boilers for heat. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX D 15. Primary pipe-mounted circulation pumps 16. School’s fuel oil tank. Note AHU outdoor intake next to the fuel oil tank. 17. Classroom air handling unit locate in the boiler room. The controller was noted to be in the Off position overriding the DDC system which is good while school is not in service. 18. Exhaust fans typical for the schools toilet rooms. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY SCHOOL ENERGY AUDIT REPORT APPENDIX D 19. View of the gym AHU’s which were oil fired furnaces originally that have been converted to AHU’s with the installation of heating coils and controls. 20. One of the zone valves was found to be out of service allowing the heating loop to run wild. 21. View of EF-2 for the gym locker rooms. Evidence of a roof leak can be seen. 22. View of the below grade wall insulation from the crawlspace. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E Appendix E Thermal Site Visit Photos CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 1. Heat loss exhibited from exhaust fan, windows and rim joist. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 2. Windows typical of school, expected heat loss surrounding windows. Large heat loss from joint area. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 3. Close-up of school’s rim joist section with exhibited heat loss through the insulation sheathing. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 4. Close-up of school’s heat loss from rim joist area.. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 5. School doorway with exhibited heat loss around edges. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 6. View of the front door assembly. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 7. (A) Exhaust vent typical of school, heat loss expected while equipment is operational. (B) Heat loss exhibited from the wall joint sections. A B CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 8. Roof overview, heat loss exhibited along crack line. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 9. Roof overview above the gym AHU’s, heat loss expected from exhaust vents. Roof leak into the below room appears to be coming from this section which can reduce the insulation value and rot out the roof assembly in this section. CENTRAL ALASKA ENGINEERING COMPANY KIBSD LARSEN BAY ELEMENTARY ENERGY AUDIT REPORT APPENDIX E 10. Unusually high rate of heat loss exhibited from dormer section above the classrooms.