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Home My WebLink AboutCIRI-ANC-CAEC Birchwood ABC Elementary School 2012-EEENERGY AUDIT FINAL REPORT Birchwood ABC Elementary School 17010 Birchtree Street Chugiak, AK 99567 p (907) 742*3450 AkWarm ID No. CIRI*ANC*CAEC*14 800 F Street Anchorage, AK 99501 p (907) 276*6664 f (907) 276*5042 Contact: Walter Heins, PE, CCP, CxA, CEA 32215 Lakefront Dr. Soldotna, Alaska 99669 p (907) 260*5311 Contact: Jerry P. Herring, PE, CEA Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 i AkWarm No. CIRI*ANC*CAEC*14 Contents I. Executive Summary .................................................................................................................. 1 II. Introduction .............................................................................................................................. 4 III. Energy Audit Process ............................................................................................................. 5 IV. Method of Analysis ................................................................................................................. 6 V. Building Description ................................................................................................................ 7 V.I ARCHITECTURAL DESCRIPTION ............................................................................................................................ 8 V.II MECHANICAL DESCRIPTION ............................................................................................................................... 9 V.III ELECTRICAL DESCRIPTION .............................................................................................................................. 10 VI. Historic Energy Consumption and Cost............................................................................. 11 VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 11 VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 11 VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 11 VII. Equipment Inventory and Photo Survey .......................................................................... 13 VIII. Energy Conservation Measures ....................................................................................... 14 VIII.I SCHOOL ENERGY CONSERVATION MEASURES ............................................................................................... 14 VIII.II ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ......................................... 18 Appendices Appendix A – Energy Benchmark Data Appendix B – AkWarm Commercial Reports Appendix C – Major Equipment List Appendix D – Energy Conservation Measures Appendix E – Site Survey Photos Appendix F – Thermographic Photos Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 ii AkWarm No. CIRI*ANC*CAEC*14 Abbreviations AHFC Alaska Housing & Finance Corporation ARRA American Recovery & Reinvestment Act ASD Anchorage School District ASHRAE American Society of Heating, Refrigeration, and Air*Conditioning Engineers BTU British Thermal Unit CCF One Hundred Cubic Feet CFM Cubic Feet per Minute DDC Direct Digital Control ECI Energy Cost Index ECM Energy Conservation Measure EPDM Ethylene Propylene Diene Monomer EUI Energy Utilization Index F Fahrenheit HP horsepower HPS High Pressure Sodium HVAC Heating, Ventilating, and Air*Conditioning in inch(es) IPLC Integrated Power & Load Circuit kWh kilowatt*hour LED Light*Emitting Diode O&M Operations & Maintenance sf square feet SIR Savings*to*Investment Ratio V Volts W Watts Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 iii AkWarm No. CIRI*ANC*CAEC*14 List of Figures Fig. 1 – Energy Audit Clients ....................................................................................................................... 1 Fig. 2 – Energy Benchmark Data .................................................................................................................. 1 Fig. 3 – Chugiak, Alaska – Google Maps ..................................................................................................... 4 Fig. 4 – Birchwood ABC Elementary School – Google Maps ..................................................................... 4 Fig. 5 – Birchwood ABC Elementary Floor Plan ......................................................................................... 7 List of Tables Table 1 * Recommended Energy Conservation Measures, Birchwood ABC Elementary School ................ 2 Table 2 * Building History, Birchwood ABC Elementary School ................................................................ 8 Table 3 * Energy Cost and Consumption Data ........................................................................................... 11 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 iv AkWarm No. CIRI*ANC*CAEC*14 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 AkWarmC , the Alaska Retrofit Information System (ARIS), or other state and/or public information systems. AkWarmC is a building energy modeling software developed under contract by AHFC. Limitations of Study This energy audit is intended to identify and recommend potential areas of energy savings, estimate the value of the savings, and provide an opinion of the costs to implement the recommendations. This audit meets the criteria of a Level 2 Investment Grade Audit (IGA) per the American Society of Heating, Refrigeration, Air*conditioning Engineers (ASHRAE) and the Association of Energy Engineers (AEE), and is valid for one year. The life of the IGA may be extended on a case*by*case basis, at the discretion of AHFC. In preparing this report, the preparers acted with the standard of care prevalent in this region for this type of work. All results are dependent on the quality of input data provided. Not all data could be verified and no destructive testing or investigations were undertaken. Some data may have been incomplete. This report is not intended to be a final design document. Any modifications or changes made to a building to realize the savings must be designed and implemented by licensed, experienced professionals in their fields. Lighting upgrades should undergo a thorough lighting analysis to assure that the upgrades will comply with State of Alaska Statutes as well as Illuminating Engineering Society (IES) recommendations. All liabilities for upgrades, including but not limited to safety, design, and performance are incumbent upon the professional(s) who prepare the design. Coffman Engineers, Inc (CEI) and Central Alaska Engineering Company (CAEC) bear no responsibility for work performed as a result of this report. Financial ratios may vary from those forecasted due to the uncertainty of the final installed design, configuration, equipment selected, installation costs, related additional work, or the operating schedules and maintenance provided by the owner. Furthermore, many ECMs are interactive, so implementation of one ECM may impact the performance of another ECM. CEI and CAEC accept no liability for financial loss due to ECMs that fail to meet the forecasted financial ratios. The economic analyses for the ECMs relating to lighting improvements are based solely on energy savings. Additional benefits may be realized in reduced maintenance cost, deferred maintenance, and improved lighting quality. The new generation lighting systems have significantly longer life leading to long term labor savings, especially in high areas like Gyms and exterior parking lots. Lighting upgrades displace re*lamping costs for any fixtures whose lamps would otherwise be nearing the end of their lifecycle. This reduces maintenance costs for 3*7 years after the upgrade. An overall improvement in lighting quality, quantified by numerous studies, improves the performance of students and workers in the built environment. New lighting systems can be designed to address all of the above benefits. US Government Disclaimer This material is based upon work supported by the Department of Energy under Award Number DE*EE0000095. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 1 AkWarm No. CIRI*ANC*CAEC*14 I. Executive Summary This report presents the findings of an energy audit conducted at Birchwood ABC Elementary School (BES) as part of a contract for: Alaska Housing Finance Corporation Contact: Rebekah Luhrs 4300 Boniface Parkway Anchorage, AK 99510 Email: rluhrs@ahfc.us Anchorage School District Contact: Calvin Mundt 1301 Labar Street Anchorage, AK 99515*3517 Email: mundt_calvin@asdk12.org Fig. 1 – Energy Audit Clients This audit was performed using American Recovery and Reinvestment Act (ARRA) funds to promote the use of innovation and technology to solve energy and environmental problems in a way that improves the State of Alaska’s economy. This can be achieved through the wiser and more efficient use of energy. The average January 2009*December 2010 documented annual utility costs at this facility are as follows: Electricity $56,754 Natural Gas $41,057 Total $97,811 January 2009*December 2010 Energy Utilization Index (EUI) = 103.3 kBtu/sf January 2009*December 2010 Energy Cost Index = 1.74 $/sf Fig. 2 – Energy Benchmark Data Energy Conservation Measures (ECMs) calculated to be cost effective are shown below in the Executive Summary Table with the energy analyst’s best opinion of probable cost, savings, and investment returns. Be aware that the measures are not additive because of the interrelation of several of the measures. The cost of each measure for this level of auditing is ± 30% until detailed engineering, specifications, and hard proposals are obtained. See section VIII for detailed descriptions of all cost effective ECMs. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 2 AkWarm No. CIRI*ANC*CAEC*14 Table 1 7 Recommended Energy Conservation Measures, Birchwood ABC Elementary School Executive Summary – Recommended ECMs Birchwood ABC Elementary School Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) BES*1a Refrigerators Replace residential & light commercial refrigerators/freezers older than 5 years old * * * <10 BES*2 Setback Thermostat: Cafeteria, Gym, Classrooms, Offices Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Cafeteria, Gymnasium, Classrooms, and Offices $2,830 $600 63.41 0.2 BES*3 Lighting: Corridors and Cafeteria Replace all T12 light fixtures with T8 fixtures, install occupancy sensors, and re*wire night lights $3,177 $21,200 2.20 6.7 BES*4b Mechanical Pump Motors Repair motors on pumps P* 3 and P*4 with new premium efficiency motors at time of next motor replacement. $97 $800 1.61 8.2 BES*5 Lighting: Staff Break Room Install new occupancy sensors in the staff break rooms 46 and 47 $33 $300 1.60 9.1 BES*6 Lighting: Offices Replace all T12 light fixtures with T8 fixtures and install a new occupancy sensor in each office $136 $1,300 1.59 9.2 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 3 AkWarm No. CIRI*ANC*CAEC*14 Executive Summary – Recommended ECMs Birchwood ABC Elementary School Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) BES*7 Lighting: Restrooms Replace all T12 light fixtures with T8 fixtures, replace all magnetic ballasts with electronic ballasts and install a new occupancy sensor in each restroom $474 $4,700 1.47 9.9 BES*8 Exterior Door: Original Construction Entryway Doors Remove existing door and install standard pre*hung U* 0.16 insulated door, including hardware. $254 $4,100 1.44 16.1 BES*9b Mechanical Pump Motors Repair motors on pumps P* 1 and P*2 with new premium efficiency motors at time of next motor replacement. $99 $1000 1.39 9.3 BES*10 Lighting: Exterior Replace each building mounted High Pressure Sodium light fixture with an LED light fixture $1,376 $14,500 1.36 10.5 BES*11 HVAC Replace boiler B*1 with new modulating high efficiency gas boiler. Keep existing boiler B*2 as back up. $7,068 $125,000 1.31 17.7 BES*12 Air Tightening Perform air sealing to reduce air leakage by 20%. $1,029 $9,000 1.01 8.7 Notes: a Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and result in viable energy savings. b. This item is intended to be implemented as HVAC pumps burn out and require replacement, when expenses must be made due to equipment failure. This is the cost difference between standard efficiency motors and high efficiency motors for the HVAC pumps. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 4 AkWarm No. CIRI*ANC*CAEC*14 II. Introduction This energy audit was conducted at Birchwood ABC Elementary School (BES) for AHFC and the Anchorage School District. The school is an approximately 56,208 square foot (sf) campus that includes classrooms, restrooms, administrative offices, a library, a gymnasium, and supporting utility and storage spaces. The location of the school is shown in the following regional and overhead images. The energy audit was conducted in order to evaluate areas and equipment where energy savings can be realized. The savings are then compared to a baseline and evaluated for reasonable project financial ratios and payback. Fig. 3 – Chugiak, Alaska – Google Maps Fig. 4 – Birchwood ABC Elementary School – Google Maps Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 5 AkWarm No. CIRI*ANC*CAEC*14 III. Energy Audit Process Prior to visiting the school, the first task was to collect and review two years of utility data for electricity and natural gas usage. This information was used to analyze operational characteristics, calculate energy benchmarks for comparison to industry averages, estimate savings potential and establish a baseline to monitor the effectiveness of implemented energy conservation measures. A spreadsheet was used to enter, sum, and calculate benchmarks and to graph energy use information (see Appendix A). The primary benchmark calculation used for comparison and baseline data is the Energy Utilization Index, or EUI (see Section VI). After gathering the utility data and calculating the EUI, the next step in the audit process was to review the architectural and engineering drawings to develop a building profile which documented building age, type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating, and Air Conditioning (HVAC), water heating, refrigeration, snow*melt, and etc. The building profile is utilized to generate, and answer, all 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 was gathered, the next step in the process was to conduct a site survey. A site survey was completed on January 5, 2012. Time was spent inspecting the building systems that impact energy consumption and answering questions from the preliminary review of the school. The on* site contact during the investigation was Mr. Bob Halpin of the ASD Facilities Department1. The following information was also collected while on site: occupancy schedules, O&M practices, building energy management program, and other information that has an impact on energy consumption. The following energy audit includes an evaluation of the information gathered, the researching of possible conservation opportunities, organizing the energy audit into a comprehensive report, and making ECM recommendations for mechanical, electrical, and building envelope improvements. 1 Mr. Bob Halpin, (907) 632*2884 (mobile), (907) 348*5212 (office) Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 6 AkWarm No. CIRI*ANC*CAEC*14 IV. Method of Analysis Having completed the preliminary energy audit tasks, Coffman Engineers, Inc., (CEI) conducted a site survey. The site survey provides critical input in deciphering where energy savings opportunities exist within a facility. The audit team from CEI walked the entire site to inventory and investigate the building envelope and major equipment, including: HVAC, water heating, lighting, and equipment located in the multipurpose room, kitchen, offices, and classrooms. An understanding of how the equipment is used is determined during the site survey. The collected data was entered into AkWarm Commercial™ software, an energy calculating program for buildings. The data was processed by AkWarm to model a baseline from which ECMs could be considered. The model was compared to actual utility costs to ensure the quality of the baseline and proposed energy modeling performed by AkWarm. The recommended ECMs focus on the building envelope, HVAC, lighting, water heating, and other electrical measures that will reduce annual energy consumption. ECMs are evaluated based on building use and processes, local climate conditions, building construction type, function, operational schedule, existing conditions, and foreseen future plans. When new equipment is proposed, energy consumption is calculated based on the manufacturer’s cataloged information. Energy savings are calculated by AkWarm. Implementation of more than one ECM often affects the savings of other ECMs. The savings may in some cases be relatively higher for an ECM implemented individually than when that ECM is just one of multiple recommended ECMs. For example, implementing reduced operating schedules of inefficient lighting systems may result in a given savings. Also implementing a more efficient lighting system will add to the savings, but less than the efficient lighting would alone because there is less energy to be saved when the lights are on a reduced operating schedule. Thus, if multiple ECM’s are recommended, the combined savings are calculated and identified appropriately in groups. In Appendix D, Energy Conservation Measures, the simple lifetime calculation is shown for each ECM, which is based on the typical life of the equipment being replaced or altered. The energy savings are extrapolated throughout the simple lifetime of the ECM. The total energy savings is calculated as the total lifetime multiplied by the yearly energy savings. The cost savings and installation costs are used to calculate simple payback2 and the Savings to Investment Ratio3 (SIR). These are listed in Appendix D and summarized in the Executive Summary Table of this report. The SIR is calculated as a ratio by dividing the break even cost by the initial installed cost. Cost savings is calculated based on the historical energy costs for the building. Installation costs include labor and equipment to evaluate the initial investment required to implement an ECM. These are applied to each recommendation with simple paybacks calculated. The energy analyst’s opinions of probable cost are garnered from RS Means Cost Data, other industry publications, and local contractors and suppliers. In addition, where applicable, maintenance cost savings are estimated and applied to the net savings. 2 The simple payback is based on the years that it takes for the net savings to payback the net installation cost (Cost divided by Savings). 3 Savings to Investment Ratio (SIR): Break Even Cost divided by initial installed cost, where Break*Even Cost is how much can be spent and still have the measure be cost effective; it equals the Present Value (PV) of Savings over the life of the measure minus PV of maintenance costs. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 7 AkWarm No. CIRI*ANC*CAEC*14 V. Building Description Birchwood ABC Elementary School is a single story building originally constructed in 1967. The school building consists of classrooms, administrative offices, a cafeteria, a gymnasium, a library, and several utility spaces. Fig. 5 – Birchwood ABC Elementary Floor Plan Birchwood ABC Elementary School is occupied by approximately 358 people from 7 a.m. until 11 p.m. weekdays during the school year. The school’s gymnasium, library, art and music room are used for after school sports and community activities. The school year runs from August through May. Most of the building, except the main office and maintenance areas, is unoccupied and shut down from June to the end of July. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 8 AkWarm No. CIRI*ANC*CAEC*14 Birchwood ABC Elementary School has undergone several additions and renovations throughout its history. A brief list of the major projects and years completed are shown below. Table 2 7 Building History, Birchwood ABC Elementary School Birchwood ABC Elementary – Building History* Date Addition or Renovation 1967 Original Construction 1969 Addition of Six Classrooms 1983 Addition and Renovation of Resource Room 1987 Upgrade Doors and Walls to Fire Code 1994 Addition of Cafeteria and Four Classrooms 1997 Re*Roof of Entire School 1999 Corridor Lighting Upgrade *History is based on available drawings from ASD. V.I Architectural Description Wall, floor, and roof construction details were obtained from the architectural drawings. The exterior walls of the school, except around the gymnasium and the 1994 classroom addition, are constructed of 5” precast concrete panels with 2” rigid insulation and 5/8” vinyl covered gypsum board for an effective R* value of R*9.5. The R*value of these walls is significantly lower than typical R*values used in current construction and lower than current building code allows. Wall heights in most of the building are approximately 11 feet high. This wall height accounts for a suspended ceiling concealing ductwork and mechanical heating equipment. The gymnasium walls are composed of 6” precast concrete panels that are insulated with 2” fiberglass blanket insulation covered by gypsum wall board for an effective R*value of R*9.6. The gymnasium walls are approximately 18’ high. The exterior walls of the 1994 building addition are constructed of 6” metal studs on 16” centers filled with 6” fiberglass batt insulation, 1/2” gypsum sheathing, 2” rigid insulation, and 3/8” synthetic stucco. The 1994 building addition exterior walls vary in height from 12’*8” to 19’*2” high with an effective R*value of R*24.5. The site survey, in addition to analysis of the construction drawings, shows that there is approximately 14,821 sf of total wall area in the school building. The school’s flooring consists of 4” concrete slab on grade with rigid perimeter insulation extending to the footing. This perimeter insulation is 2” thick and is applied to the external face of the foundation wall in the school building’s 1994 classroom addition. There is 1” rigid perimeter insulation applied to the interior face of the foundation wall everywhere else in the building. The school has a 3’x4’ insulated pipe chase along the foundation wall that surrounds the original school construction and the 1969 building addition. There is approximately 52,949 sf of slab on grade flooring with an additional 3,259 sf in the second floor fan room and the below*grade boiler room. There is a total of 56,208 sf of floor area in the school. The school building, except for the 1994 addition, has a built*up flat roof containing a metal deck, a vapor barrier, 1/2” sheet rock that is mechanically attached to the deck, tapered rigid insulation, and an EPDM membrane for a minimum overall R*value of R*20. The roof of the 1994 building addition is composed of 5/8” treated plywood over a steel deck with a waterproof membrane and 6” rigid insulation for an effective R*value of R*33. Analysis of the architectural drawings shows a roof area of approximately 52,949 sf for the school. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 9 AkWarm No. CIRI*ANC*CAEC*14 The school’s windows are all double pane, 1/2” air space, aluminum framed windows with an effective R* value of R*1.6. From the architectural drawings, the window headers appear to be insulated. The total window area for the school is approximately 4,475 sf. The door types throughout the school vary depending on renovation projects. All of the original entry way doors, installed in 1967 and also in the 1969 addition, are full lite, hollow metal doors containing single pane glass windows with single pane perimeter windows for an effective R*value of R*1.0. Newer entry way doors, installed in the 1994 addition, are insulated hollow metal with double pane half*lite windows with a 1/2” air space for an effective R*value of R*3.0. The perimeter windows surrounding these doors are double pane with a 1/2” air space in insulated metal frames. The gymnasium contains two insulated, hollow metal doors with no windows that provide an effective R*value of R*5.0. The weather stripping on most of the doors appears to be in fair condition and consists of mostly plastic or vinyl brushes on the exterior side of the doors. V.II Mechanical Description The school is heated using two Weil*McLain BE*988 gas*fired, cast*iron sectional boilers, each supplied with a Gordon Piatt R8.4*G*20 power burner. The boilers and burners were installed in 1994 and have DDC controls. Each boiler has a 2,713 MBH input rating and operates during the school year from August through June. A 3 HP Bell and Gossett circulation pump is provided for each boiler and heating water is circulated throughout the building by two 5 HP Bell and Gossett base mounted pumps. Combustion air is supplied to the boiler room through an open rooftop vent. Ventilation for the boiler room is provided by AHU*3, a Trane Climate Changer 10A with a 3 HP fan. Domestic hot water is supplied by two 80 gallon indirect Superstor SSU*80DW water heaters, which were installed in 2010 and are located in the boiler room. The domestic hot water is recirculated with a Grundfos 150W bronze circulation pump. Conditioned air is provided to the school building using eight air handling units (AHUs) that are predominantly rooftop units. The west and east side classrooms, part of the original 1967 construction, are served by AHU*4 and AHU*5, respectively. The 1969 classroom addition is served by AHU*6, a 7.5 HP Scott Springfield rooftop unit. The gymnasium and the 1994 building addition, except for the computer lab and the library, is served by AHU*2 and AHU*1, respectively. They are both 3 HP rooftop units manufactured by Trane and is controlled through a combination of pneumatics and electronics. The air compressor, Emglo 2K10*60, for the building’s pneumatic actuators is located in the boiler room and was installed in 1996 with a 1.5 HP motor. AHU*7, a 1 HP Greenheck, unit serves the computer lab and is located in the ceiling above the acoustic tiles. The library is served by AHU*9, a 3 HP Scott Springfield unit with gravity exhaust, that is located is a small fan room accessible from inside the library. AHU*8, Pace SFC*79A, provides supply air to a teacher workroom space designated the E*Z Lab. The unit is located in the ceiling of the E*Z Lab above the acoustic tiles but can be accessed by a ladder located in a supply closet inside the boys’ restroom. Refer to Appendix C, Major Equipment List, for the manufacturer and capacity details of individual equipment. The school’s building energy management and control system is a hybrid system, using a Siemens Direct Digital Control system and electronic to pneumatic transducers controlling pneumatic actuators. Compressed air is provided by an air compressor in the boiler room. The system was observed to be in fair working order, however, pneumatic systems are considered archaic due to the vast improvements in monitoring, control and operating efficiencies available from the modern genre of electronic control systems. The energy management and control system controls the boilers, heating water pumps, and air handling units. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 10 AkWarm No. CIRI*ANC*CAEC*14 V.III Electrical Description The school is served by a 1600 amp (A), 120/208 volt (V), three phase, 4*wire, underground electrical service connected to a pad mounted utility transformer. The school has a 30 kilowatt standby diesel generator used to power selected loads in the event of a power outage. Standby power is distributed through an automatic transfer switch to a 225A distribution panel. Standby loads include the un*switched hallway night lights. The school has undergone several lighting upgrades since the original construction including an upgrade to the hallway lighting in 1999 where 2'x2' three lamp bi*axial fluorescent light fixtures were installed in all of the corridors west of the cafeteria. The record drawings were used to provide a count of the number of night lights present, and approximately 25% of the corridors lights are used as night lights. In 2004, T8 fluorescent lighting was installed through all of the classrooms and offices west of the cafeteria. T12 strip light fixtures with magnetic ballasts are used for indirect lighting in coves in the cafeteria. T12 light fixtures are also still present in all of the spaces east of the cafeteria including the classrooms, corridors, and the gymnasium. All of the classrooms are provided with inboard outboard bi*level switching and occupancy sensors for control. Occupancy sensors were also observed in the gymnasium, and a few were present in the storage areas and offices. All other interior spaces were observed to be controlled by wall mounted rocker and keyed switches. Exterior lighting consists of 150W high pressure sodium (HPS) canopy lights, 150W HPS wall pack lights and 400W HPS pole mounted parking lot lights with both one and two heads. There are two 750W HPS pole mounted area lights illuminating the playground, and a three building mounted HPS flood lights near the hockey rink. All of the exterior lights are controlled by an on*off photo sensor that switches the light fixtures off during the day. The parking lot lights are also controlled by an input from the security system to shut them off while the building security system is armed. Other electricity*using equipment not previously described in the mechanical or electrical sections include a microwave, electric ranges, other various kitchen equipment, and various user equipment such as projectors, computers, and printers. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 11 AkWarm No. CIRI*ANC*CAEC*14 VI. Historic Energy Consumption and Cost Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and natural gas energy usage for the surveyed facility from January 2009 to December 2010. Matanuska Electric Association provides the electricity and Enstar Natural Gas provides the natural gas to the building. Both utility companies bill the facility using a commercial rate schedule. The actual utility bills were not provided to be able to verify the data received to assure 100 percent accuracy of the data. The AkWarm model of the facility was built to match the facility’s average annual electric and natural gas consumption, so that a realistic model could be created. The monthly energy consumption of the AkWarm model matches the actual average monthly consumption of the facility within 25%, which is adequate for this level of modeling. Overall, the energy consumption trends of the AkWarm model and the actual facility match appropriately. Graphical representations of the monthly energy consumption are included in Appendix A. VI.I Electrical Consumption Data The electric utility costs consist of several components: a fixed monthly customer charge, an energy usage charge, fuel surcharge, taxes, and a demand charge. The energy usage and fuel surcharge are based on the customer's usage as measured in kilowatt*hours (kWh). The usage (kWh) is determined by load wattage divided by 1,000, times hours running. For example, a 1,000 watt load operating for one hour will use 1 kWh of electricity as would ten, 100 watt lamps operating for one hour or one, 100W lamp operating for 10 hours. One kWh is equivalent to 3,413 BTU. Utility data used in this report reflects the historical data provided for the building in a summarized format. VI.II Natural Gas Consumption Data The natural gas supplier bills for consumption in CCF of natural gas, where one CCF equals 100 cubic feet of natural gas. The average heating value of natural gas is 1,000 BTUs per cubic foot, making 1 CCF equal to 100,000 BTUs or 1 Therm. VI.III Overall Energy Consumption Data The overall cost for energy use is calculated by dividing the total cost by the total usage. Based on the electric and natural gas utility data provided, the average cost for the energy and consumption calculations at the surveyed facility are summarized in the table below. Table 3 7 Energy Cost and Consumption Data Energy Cost and Consumption Data 2009 2010 Average Electric 0.16 $/kWh 0.12 $/kWh 0.14 $/kWh Natural Gas 1.00 $/CCF 0.87 $/CCF 0.94 $/CCF Total Cost $110,477 $85,145 $97,811 ECI 1.97 $/sf 1.51 $/sf 1.74 $/sf Electric EUI 25.7 kBtu/sf 25.1 kBtu/sf 25.4 kBtu/sf Natural Gas EUI 79.7 kBtu/sf 76.2 kBtu/sf 78.0 kBtu/sf Building EUI 105.3 kBtu/sf 101.4 kBtu/sf 103.3 kBtu/sf Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 12 AkWarm No. CIRI*ANC*CAEC*14 The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The building square footage was calculated to be approximately 56,208 square feet. This area is comprised of the building footprint, a second floor fan room, and a below*grade boiler room. The annual EUI is expressed in Thousands of British Thermal Units per Square Foot (kBtu/sf) and can be used to compare energy consumption of similar building types or to track consumption from year to year in the same building. The EUI is calculated by converting annual consumption of all fuels used to Btu’s and then dividing by the area (gross conditioned square footage) of the building. EUI is a good indicator of the relative potential for energy savings. A comparatively low EUI indicates less potential for large energy savings. Building architectural, mechanical, and electrical drawings were obtained and utilized to calculate and verify the gross area of the facility. The gross area was confirmed on the physical site investigation. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 13 AkWarm No. CIRI*ANC*CAEC*14 VII. Equipment Inventory and Photo Survey Following the completion of the field survey a detailed equipment list was created and is attached as Appendix C. The major equipment listed are considered to be the major energy consuming equipment in the building whose replacement could yield substantial energy savings. An approximate age was assigned to the equipment if a 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. Additionally, photos of various equipment and the building construction were taken during the site visit. Several photos are included in Appendix E. CEI made miscellaneous thermographic images of the building using a FLIR T300 Infrared Camera. This is not a thermographic study, but rather just a few snapshots to illustrate easy*to*identify heat losses. These thermographic photos are included in Appendix F. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 14 AkWarm No. CIRI*ANC*CAEC*14 VIII. Energy Conservation Measures The following ECMs described here have been calculated by AkWarm Commercial and considered by the energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios (SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered and calculated by the energy audit team, including ECMs not recommended at this time, please see Appendix D. VIII.I School Energy Conservation Measures ECM# BES71 – Replace Refrigerators Older than 5 years Old Annual Energy Savings Installed Cost SIR Payback (years) * * * <10 years Due to recent advances in refrigerators in the last five years, new Energy Star refrigerators are significantly more efficient than previous models. Replacing existing refrigerators, which are older than five years old, with new energy star models will typically have paybacks of less than 10 years. ECM # BES72– Setback Thermostat: Classrooms, Offices, Cafeteria and Gym Annual Energy Savings Installed Cost SIR Payback (years) $2,830 $576 63.41 0.2 Currently there is a night setback schedule that lowers building temperatures to 65 deg F during unoccupied times. However, even greater energy savings exist by reducing the room temperature of the classrooms, offices, gymnasium, and multipurpose spaces further to 60 deg F during unoccupied times. Lowering the heat load of the building will reduce natural gas consumption. Since the school’s thermostats are already connected to the DDC system, the costs of this ECM only includes the time required to program a night setback which can be performed by maintenance personnel. The 60 deg F night setback is feasible but may require that other DDC setpoints be changed, such as the low temperature alarm. This ECM is a compilation of items 1 and 2 as modeled in AkWarm which are intended to be implemented concurrently. Details of the individual items are shown in Appendix D. ECM # BES73 – Upgrade the Corridor and Cafeteria Lighting Annual Energy Savings Installed Cost SIR Payback (years) $3,177 $21,150 2.20 6.7 There are approximately (81) two*lamp 2'x2' troffer bi*axial, (14) single lamp T12, (53) two*lamp T12 and four single*lamp T8 fluorescent light fixtures used to illuminate the school’s corridors and cafeteria. Approximately 20% of the light fixtures present in these areas are used as nightlights and are never switched off. These night lights should be re*wired to be controlled by the local lighting circuit, and have their function as emergency lights replaced one*for*one by approximately (34) wall mounted emergency lighting units. Additionally, occupancy sensors should be installed throughout the corridors to switch the lights off when the spaces are unoccupied, and all T12 fixtures should be replaced with T8 fixtures. See items 3, 6, 7, 14, 23, 27, and 28 in Appendix D for further details. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 15 AkWarm No. CIRI*ANC*CAEC*14 ECM # BES74 – Repair Pump P73 and P74 Motors with NEMA Premium Efficiency Motors Annual Energy Savings Installed Cost SIR Payback (years) $97 $794 1.61 8.2 Replacing pump motors for P*3 and P*4 with new NEMA premium efficiency motors will offer significant energy savings. New high efficiency motors have reduced electrical demands which create significant energy savings for larger horsepower (HP) motors. The existing heating water circulation pumps, P*3 and P*4 have 5 HP motors. Replacing these existing motors while they are still functional will result in a high replacement cost with a longer payback. However, upgrading these motors to high efficiency motors when the existing motors are in need of repair will offer a more reasonable payback because the marginal cost of the high efficiency pump motor over the standard efficiency motor replacement is only a $794 repair cost. Details of the ECM are shown in item 12 in Appendix D. ECM # BES75 – Upgrade the Staff Break Room Lighting Controls Annual Energy Savings Installed Cost SIR Payback (years) $33 $300 1.60 9.1 The staff break rooms (46 and 47) are illuminated by (11) two*lamp T8 fluorescent light fixtures. Both of these rooms should be provided an occupancy sensor to control the existing light fixtures. See item 13 in Appendix D. ECM # BES76 – Upgrade Office Lighting Annual Energy Savings Installed Cost SIR Payback (years) $136 $1,250 1.59 9.2 The office spaces are illuminated by (2) two*lamp T12, (1) single*lamp T8, and (25) two*lamp T8 light fixtures. Four two*lamp T8 fixtures are controlled by an occupancy sensor and the single*lamp T8 fixture is used as a night light and is never switched off. All of the T12 light fixtures should be replaced one*for* one with T8 light fixtures. Only (4) two*lamp light fixtures in one office are controlled by an occupancy sensor. The remaining six office spaces should be provided new ceiling mounted occupancy sensors to control the remaining light fixtures including the single*lamp T8 night light. See items 5, 8, and 30 in Appendix D for further details. ECM # BES77 – Upgrade Restroom Lighting Annual Energy Savings Installed Cost SIR Payback (years) $474 $4,700 1.47 9.9 The lighting in the student restrooms is provided by a mix of both T8 and T12 light fixtures and they are all controlled by a keyed wall switches to prevent the students from tampering with the lights. It is suggested that the (22) T12 light fixtures be replaces one*for*one with T8 fixtures with programmable electronic ballasts and that ceiling mounted occupancy sensors are installed in all six student restrooms. See items 4, 9, 11, 15, 18, and 19 in Appendix D for further details. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 16 AkWarm No. CIRI*ANC*CAEC*14 There are two staff restrooms that are each provided with a 3' two*lamp T12 vanity light fixture. 3' light fixtures are not typical and it is suggested that these fixtures be replaced by either 4' single*lamp or a 2' two*lamp light fixtures, and that each room be provided with an occupancy sensor to control the lighting. See item 51 in Appendix D for additional details. ECM # BES78 – Replace Original Construction and 1969 Addition Entry Doors Annual Energy Savings Installed Cost SIR Payback (years) $254 $4,099 1.44 16.1 There are 10 entry way doors, installed during original construction and also in the 1969 addition. All are full lite metal doors containing single pane glass windows with single pane perimeter windows (R*1). It is recommended that these doors be replaced with new R*6.25 minimum (U*0.16) insulated entry doors. New weather*stripping should be installed on the new doors during replacement. See item 16 in Appendix D for more details. ECM # BES79 – Repair Pump P71 and P72 Motors with NEMA Premium Efficiency Motors Annual Energy Savings Installed Cost SIR Payback (years) $99 $926 1.39 9.3 Replacing pump motors for P*1 and P*2 with new NEMA premium efficiency motors will offer significant energy savings. New high efficiency motors have reduced electrical demands which create significant energy savings for larger horsepower (HP) motors. The existing heating water circulation pumps, P*1 and P*2 have 3 HP motors. Replacing these existing motors while they are still functional will result in a high replacement cost with a longer payback. However, upgrading these motors to high efficiency motors when the existing motors are in need of repair will offer a more reasonable payback because the marginal cost of the high efficiency pump motor over the standard efficiency motor replacement is only a $926 repair cost. Details of the ECM are shown in item 17 in Appendix D. ECM # BES710 – Upgrade Exterior Lighting Annual Energy Savings Installed Cost SIR Payback (years) $1,376 $14,500 1.36 10.5 The exterior lighting at the site consists of (11) 150W HPS canopy lights, six 150W HPS wall packs, (7) 400W HPS pole mounted "shoebox" type area lighters, (10) 400W HPS pole mounted twin head "shoebox" area lighters, (2) 750W HPS pole mounted "shoebox" area lighters, and three 400W building mounted HPS flood lights. All of the exterior lighting is controlled by a photocell that turns the lights on while once the sun sets. Additional controls shut the pole mounted light fixtures off when the school’s security system is armed. This ECM would replace the wall pack and canopy light fixtures with 72W LED light fixtures. This assumes the re*use of the existing wiring. Upgrading the pole mounted HPS light fixtures was evaluated. However, due to the fact that these lights have a night shut off, replacing them with LED fixtures did not prove to be cost effective. This description compiles measures 10, 21, and 22 which were individually modeled in AkWarm. See Appendix D for details of individual measures. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 17 AkWarm No. CIRI*ANC*CAEC*14 ECM # BES711 – Replace Lead Boiler with a High Efficiency Condensing Type Boiler Annual Energy Savings Installed Cost SIR Payback (years) $7,068 $125,000 1.31 17.7 Significant energy savings can be achieved by replacing boiler B*1 with a new, high efficiency, condensing type boiler. The remaining existing boiler, B*2, would operate as a back*up boiler for supplemental heat. New modulating and condensing high efficiency boilers vary their heat output rate to match the heating needs of the building. This allows the boiler to operate with lower return water temperatures and reduce boiler on/off cycling to significantly increase the boiler’s efficiency. An Aerco Benchmark BMK 2.0 was used as the basis for this ECM. See item 20 in Appendix D for more information. ECM # BES712 – Air Tightening Annual Energy Savings Installed Cost SIR Payback (years) $1,029 $9,000 1.01 8.7 By tightening the building envelope with air sealing improvements, infiltration into the building will be reduced. This in turn will reduce the heating load required by the building and reduce the amount of natural gas being burned by the boilers. While a blower door test was not completed, it is anticipated that air leakage is occurring through old weather stripping around doors, window frames, and wall and roof penetrations. Methods to decrease the infiltration into the building include: sealing around the windows and doors with caulking and insulation, adding new weather stripping to doors, providing gaskets to all exterior cover plates and sealing all roof and wall penetrations. Also, inspect and repair louvers and dampers within each AHU. To achieve a viable economic benefit, up to $9,000 can be invested and still achieve an SIR of 1 or greater by reducing air leakage by 20%. See item 25 in Appendix D for more information. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 18 AkWarm No. CIRI*ANC*CAEC*14 VIII.II Administrative Controls for Energy Conservation and Optimization While the intent of many energy conservation measures is to increase the efficiency of fuel*burning and electrical equipment, an important factor of energy consumption lies in the operational profiles which control the equipment usage. Such profiles can be managed by administrative controls and departmental leadership. They determine how and when fuel*burning and electrical equipment are used, and therefore have a greater impact on energy savings potential than simply equipment upgrades alone. Significant energy cost savings can be realized when ECMs are combined with efficient*minded operational profiles. Operational profiles may be outlined by organization policy or developed naturally or historically. These profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies, maintenance schedules, and site and equipment selection. Optimization of operational profiles can be accomplished by numerous methods so long as the intent is reduction in energy*using equipment runtime. Due to the numerous methods of optimization, energy cost savings solely as a result of operational optimization are difficult to predict. Quantification, however, is easy to accomplish by metering energy usage during and/or after implementation of energy*saving operational profiles and ECMs. Shown below are some examples which have proven successful for other organizations. Optimization of site selection includes scheduling and location of events. If several buildings in a given neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after* hours events are consolidated and held within the most energy efficient buildings available for use. As a result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy consumption. Two operational behaviors which can be combined with equipment upgrades are operating schedules and equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun. Operating schedules can be optimized to run equipment only during regular or high*occupancy periods. Also, through a central control system, or with digital programmable thermostats, temperature setpoints can be reduced during low*occupancy hours to maximize savings. In addition, sporadically used equipment can be shut down during unoccupied hours to further save energy. In general, having equipment operating in areas where no occupants are present is inefficient, and presents an opportunity for energy savings. Operational profiles can also be implemented to take advantage of no* or low*cost ECMs. Examples include heating plant optimizations (boiler section cleaning, boiler flush*through cleaning) and tighter controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to and finer control of equipment for after*hours control). In a large facility management program, implementation of these measures across many or all sites will realize dramatic savings due to the quantity of equipment involved. Changes to building operational profiles can only be realized while simultaneously addressing health, safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or implement operational behaviors which do not meet such considerations. That said, it is quite practical for management groups to implement administrative controls which reduce losses brought about by excess and sub*optimum usage. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Appendix A Energy Benchmark Data Eagle River First Name Last Name Middle Name Phone Steven Golab 348-5132 State Zip AK Monday- Friday Saturday Sunday Holidays 8-4:30 Average # of Occupants During 358 Renovations Date Birchwood ABC Elementary Education - K - 12 56,208 Facility Address Building Type Mixed Community Population Facility City Year Built 1967 Building Name/ Identifier Building Usage Building Square Footage Facility Owned By Date 07/22/11Municipal Government/Subdivision REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner MOA 17010 Birchtree St17010 Birchtree St Primary Operating Hours Contact Person City Anchorage Mailing Address Facility Zip 261,500 99517 Email Golab_Steven@asdk12.org Details PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton Other energy sources? Describe 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. Birchwood ABC Elementary Buiding Size Input (sf) =56,208 2009 Natural Gas Consumption (Therms)44,775.00 2009 Natural Gas Cost ($)44,753 2009 Electric Consumption (kWh)422,764 2009 Electric Cost ($)65,724 2009 Total Energy Use (kBtu)5,920,394 2009 Total Energy Cost ($)110,477 Annual Energy Use Intensity (EUI) 2009 Natural Gas (kBtu/sf) 79.7 2009 Electricity (kBtu/sf)25.7 2009 Energy Utilization Index (kBtu/sf)105.3 Annual Energy Cost Index (ECI) 2009 Natural Gas Cost Index ($/sf)0.80 2009 Electric Cost Index ($/sf)1.17 2009 Energy Cost Index ($/sf)1.97 2010 Natural Gas Consumption (Therms)42,854.002010 Natural Gas Consumption (Therms)42,854.00 2010 Natural Gas Cost ($)37,361 2010 Electric Consumption (kWh)413,637 2010 Electric Cost ($)47,784 2010 Total Energy Use (kBtu)5,697,143 2010 Total Energy Cost ($)85,145 Annual Energy Use Intensity (EUI) 2010 Natural Gas (kBtu/sf)76.2 2010 Electricity (kBtu/sf)25.1 2010 Energy Utilization Index (kBtu/sf)101.4 Annual Energy Cost Index (ECI) 2010 Natural Gas Cost Index ($/sf)0.66 2010 Electric Cost Index ($/sf)0.85 20010 Energy Cost Index ($/sf)1.51 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's Birchwood ABC ElementaryNatural GasProvider Meter # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC336 Jan-09 12/31/08 02/02/09337,0957,095$7,172$1.01Enstar NGC336 Feb-09 02/02/09 03/02/09285,7315,731$5,808$1.01Enstar NGC336 Mar-09 03/02/09 04/01/09305,0865,086$5,164$1.02Enstar NGC336 Apr-09 04/01/09 04/29/09283,5483,548$3,625$1.02Enstar NGC336 May-09 04/29/09 06/01/09332,4032,403$2,469$1.03Enstar NGC336 Jun-09 06/01/09 06/30/09291,2791,279$1,349$1.05Enstar NGC336 Jul-09 06/30/09 08/03/09341,0761,076$1,137$1.06Enstar NGC336 Aug-09 08/03/09 09/01/09292,0002,000$2,074$1.04Enstar NGC336 Sep-09 09/01/09 09/30/09292,8292,829$2,904$1.03Enstar NGC336 Oct-09 09/30/09 10/30/09303,1063,106$3,182$1.02Enstar NGC336 Nov-09 10/30/09 11/30/09315,4275,427$5,505$1.01Enstar NGC336 Dec-09 11/30/09 12/30/09305,1955,195$4,364$0.84Enstar NGC336 Jan-10 12/30/09 01/29/10306,0116,011$5,039$0.84Enstar NGC336 Feb-10 01/29/10 03/01/10313,7843,784$3,188$0.84Enstar NGC336 Mar-10 03/01/10 04/01/10314,2784,278$3,638$0.85Enstar NGC336Apr-1004/01/1004/30/10293,4033,403$2,911$0.86Enstar NGC336Apr-1004/01/1004/30/10293,4033,403$2,911$0.86Enstar NGC336 May-10 04/30/10 05/28/10281,6861,686$1,482$0.88Enstar NGC336 Jun-10 05/28/10 06/29/10321,3491,349$1,190$0.88Enstar NGC336 Jul-10 06/29/10 07/29/10301,1901,190$1,076$0.90Enstar NGC336 Aug-10 07/29/10 08/30/10322,4342,434$2,298$0.94Enstar NGC336 Sep-10 08/30/10 09/29/10302,1712,171$2,098$0.97Enstar NGC336 Oct-10 09/29/10 10/28/10293,4933,493$3,177$0.91Enstar NGC336 Nov-10 10/28/10 11/29/10324,5414,541$3,976$0.88Enstar NGC336 Dec-10 11/29/10 12/29/10308,5148,514$7,288$0.86Jan - 09 to Dec - 09 total:44,77544,7750$44,753$0Jan - 10 to Dec - 10 total:42,85442,8540$37,361$0$1.00$0.87Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg: $3,000 $4,000 $5,000 $6,000 $7,000 $8,000 4,0005,0006,0007,0008,0009,000Natural Gas Cost ($)Natural Gas Consumption (Therms)Birchwood ABC Elementary - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $1,000 $2,000 $3,000 01,0002,0003,000Jan-09 Mar-09 May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10Natural Gas Consumption (Therms)Date (Mon - Yr) Birchwood ABC ElementaryElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)MEA TLS9S100 Jan-09 12/28/2008 1/27/2009 3041,2931,409136 $7,265$0.180MEA TLS9S100 Feb-09 1/27/2009 2/25/20092942,2031,440136 $11,730$0.280MEA TLS9S100 Mar-09 2/25/2009 3/25/20092838,5351,315136 $5,954$0.150MEA TLS9S100 Apr-09 3/25/2009 4/27/20093337,3891,276141 $5,283$0.140MEA TLS9S100 May-09 4/27/2009 5/28/20093133,8791,156141 $4,863$0.140MEA TLS9S100 Jun-09 5/27/2009 6/28/20093213,60346462 $2,030$0.150MEA TLS9S100 Jul-09 6/28/2009 7/28/20093015,672535133 $2,269$0.140MEA TLS9S100 Aug-09 7/28/2009 8/26/20092935,1531,200138 $4,835$0.140MEA TLS9S100 Sep-09 8/26/2009 9/27/20093240,5301,383138 $5,421$0.130MEA TLS9S100 Oct-09 9/27/2009 10/27/20093042,5421,452130 $5,501$0.130MEA TLS9S100 Nov-09 10/27/2009 11/27/20093143,0421,469130 $5,525$0.130MEA TLS9S100 Dec-09 11/28/2009 12/27/20092938,9231,328129 $5,048$0.1300MEA TLS9S100 Jan-10 12/27/2009 1/26/20103040,2251,373130 $4,846$0.120MEA TLS9S100 Feb-10 1/26/2010 2/22/20102734,7361,186130 $4,231$0.120MEA TLS9S100 Mar-10 2/22/2010 3/28/20103437,4921,280130 $4,459$0.120MEA TLS9S100 Apr-10 3/28/2010 4/27/20103037,3201,274125 $4,177$0.110MEA TLS9S100 May-10 4/27/2010 5/25/20102832,1131,096125 $3,650$0.110MEA TLS9S100 Jun-10 5/25/2010 6/27/20103315,447527125 $1,663$0.110MEA TLS9S100 Jul-10 6/27/2010 7/27/20103017,540599122 $1,942$0.110MEA TLS9S100 Aug-10 7/27/2010 8/28/20103235,8841,225123 $4,027$0.110MEA TLS9S100 Sep-10 8/28/2010 9/27/20103038,2891,307123 $4,341$0.110MEA TLS9S100 Oct-10 9/27/2010 10/26/20102939,8461,360116 $4,668$0.120MEA TLS9S100 Nov-10 10/26/2010 11/28/20103338,1961,304116 $4,427$0.120MEA TLS9S100 Dec-10 11/28/2010 12/27/20102946,5491,589122 $5,353$0.110Jan - 09 to Dec - 09 total:422,76414,4291,550$65,7240Jan - 10 to Dec - 10 total:413,63714,1171487$47,7840$0.16$0.12Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg: $6,000$8,000$10,000$12,000$14,00020,00025,00030,00035,00040,00045,00050,000Electric Cost ($)Electric Consumption (kWh)Birchwood ABC Elementary - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$2,000$4,00005,00010,00015,00020,000Jan-09 Mar-09 May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10Electric Consumption (kWh)Date (Mon - Yr) Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Appendix B AkWarm Commercial Reports Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 ENERGY AUDIT REPORT – PROJECT SUMMARY Created 2/23/2012 7:22 AM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Birchwood ES Auditor Company: Coffman Engineers, Inc. Address: 17010 Birchtree St. Auditor Name: Walter Heins, PE, CCP, CxA, CEA City: Chugiak Auditor Address: 800 F Street Anchorage, AK 99501 Client Name: Calvin Mundt Client Address: 1301 Labar Street Anchorage, AK 99515 Auditor Phone: (907) 276*6664 Auditor FAX: Client Phone: (907) 742*5213 Auditor Comment: Client FAX: Design Data Building Area: 56,208 square feet Design Heating Load: Design Loss at Space: 1,472,370 Btu/hour with Distribution Losses: 1,533,719 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 2,337,987 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 358 people Design Indoor Temperature: 68 deg F (building average) Actual City: Chugiak Design Outdoor Temperature: *16.5 deg F Weather/Fuel City: Chugiak Heating Degree Days: deg F*days Utility Information Electric Utility: Matanuska Electric Assn. * Commercial * Sm Natural Gas Provider: Enstar Natural Gas * Commercial * Sm Average Annual Cost/kWh: $0.140/kWh Average Annual Cost/ccf: $0.940/ccf Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrigeration Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $34,666 $0 $6,842 $27,153 $0 $11,827 $0 $0 $17,440 $0 $97,929 With Proposed Retrofits $25,863 $0 $2,057 $17,746 $0 $11,527 $0 $0 $17,440 $0 $74,633 SAVINGS $8,804 $0 $4,784 $9,407 $0 $301 $0 $0 $0 $0 $23,296 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 $0$20,000$40,000$60,000$80,000$100,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Annual Modeled Consumption (Blue) compared to Actual Electric (Left) and Natural Gas (Right) Consumption (Orange). Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Monthly Modeled Consumption (Blue) compared to Actual Electric Consumption (Orange). Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Monthly Modeled Consumption (Blue) compared to Actual Natural Gas Consumption (Orange). Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Appendix C Major Equipment List Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B*1 BOILER RM BUILDING HEATING WEIL*MCLAIN BG*988 CAST IRON GAS FIRED 2713 MBH ≈ 80% 2 HP 30 ≈ 12 B*2 BOILER RM BUILDING HEATING WEIL*MCLAIN BG*988 CAST IRON GAS FIRED 2713 MBH ≈ 80% 2 HP 30 ≈ 12 P*1 BOILER RM BOILER CIRC BELL & GOSSETT 4X4X9.5 INLINE 270GPM 20' 85 3 HP 10 3 P*2 BOILER RM BOILER CIRC BELL & GOSSETT 4X4X9.5 INLINE 270GPM 20' 85 3 HP 10 3 P*3 BOILER RM HEATING WATER CIRC BELL & GOSSETT AD77 BASE*MOUNTED 230GPM 40' 85.5 5 HP 20 13 P*4 BOILER RM HEATING WATER CIRC BELL & GOSSETT AD77 BASE*MOUNTED 230GPM 40' 85.5 5 HP 20 13 P*5 ROOFTOP AHU GLYCOL COIL FEED BELL & GOSSETT PL30 INLINE 10GPM 17’ * 1/12 HP 10 3 P*6 ROOFTOP AHU GLYCOL COIL FEED BELL & GOSSETT PL30 INLINE 10GPM 17’ * 1/12 HP 10 3 P*7 ROOFTOP AHU GLYCOL COIL FEED BELL & GOSSETT PL30 INLINE 15GPM 17’ * 1/12 HP 10 3 P*8 BOILER RM DOMESTIC HOT WATER RECIRC BELL & GOSSETT PL30B INLINE 10GPM 17’ * 150 W 10 3 AC*1 BOILER RM PNEUMATIC AIR SUPPLY EMGLO 2K10*60 AIR COMPRESSOR * ≈ 78.5% 1.5 HP 20 4 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) WH*1 BOILER RM DOMESTIC HOT WATER SUPERSTOR SSU*80DW INDIRECT 80 GAL * * 24 22 WH*2 BOILER RM DOMESTIC HOT WATER SUPERSTOR SSU*80DW INDIRECT 80 GAL * * 24 22 AHU*1 FAN RM ’93 ADDITION CLASSROOMS TRANE CLIMATE CHANGER 10A CENTRIFUGAL 4400CFM 1.5" * 3 HP 25 10 AHU*2 FAN RM ’93 ADDITION GYM TRANE CLIMATE CHANGER 10A CENTRIFUGAL 4500CFM 1.75" * 3 HP 25 10 AHU*3 BOILER RM BOILER RM VENTILATION TRANE CLIMATE CHANGER 10A CENTRIFUGAL 5060CFM 1.25" * 3 HP 25 10 AHU*4 ROOF ’67 WEST CLASSROOMS SCOTT SPRINGFIELD 251 APF CENTRIFUGAL 8800CFM 1.5” * 7.5 HP 25 19 AHU*5 ROOF ’67 EAST CLASSROOMS SCOTT SPRINGFIELD 251 APF CENTRIFUGAL 8800CFM 1.5” * 7.5 HP 25 19 AHU*6 ROOF ’69 ADDITION CLASSROOMS SCOTT SPRINGFIELD 251 APF CENTRIFUGAL 7400CFM 1.5” * 7.5 HP 25 19 AHU*7 COMP LAB PLENUM COMP LAB GREENHECK * CENTRIFUGAL 1800CFM 0.2” * 1 HP 25 17 AHU*8 EZ LAB PLENUM EZ LAB PACE SFC*79A CENTRIFUGAL 900CFM 0.87” * 0.5 HP 25 10 AHU*9 LIBRARY LIBRARY SCOTT SPRINGFIELD HQ*45*AHU*4300 CENTRIFUGAL 4300CFM 0.9” * 3 HP 25 17 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF*1A ROOF AHU*4 EXHAUST SCOTT SPRINGFIELD SCE3 CENTRIFUGAL 2625CFM .25" NEMA STANDARD 0.25 HP 25 19 EF*1B ROOF AHU*4 ECONOMIZER COOLING SCOTT SPRINGFIELD SCE3 CENTRIFUGAL 6175CFM .25" NEMA STANDARD 0.5 HP 25 19 EF*2A ROOF AHU*5 EXHAUST SCOTT SPRINGFIELD SCE3 CENTRIFUGAL 2625CFM .25" NEMA STANDARD 0.25 HP 25 19 EF*2B ROOF AHU*5 ECONOMIZER COOLING SCOTT SPRINGFIELD SCE3 CENTRIFUGAL 6175CFM .25" NEMA STANDARD 0.5 HP 25 19 EF*3A ROOF AHU*6 EXHAUST SCOTT SPRINGFIELD SCE3 CENTRIFUGAL 2250CFM .25" NEMA STANDARD 0.25 HP 25 19 EF*3B ROOF AHU*6 ECONOMIZER COOLING SCOTT SPRINGFIELD SCE3 CENTRIFUGAL 5150CFM .25" NEMA STANDARD 0.5 HP 25 19 EF*4 ROOF ’69 TOILET EXHAUST GREENHECK GB*130 CENTRIFUGAL 1000CFM .37" NEMA STANDARD 0.25 HP 25 19 EF*5 ROOF RANGE HOOD EXHAUST BROAN 89000 CENTRIFUGAL 400CFM NEMA STANDARD 25 19 EF*6 ROOF ’67 TOILET EXHAUST GREENHECK GB*130 CENTRIFUGAL 1450CFM .37" NEMA STANDARD 0.25 HP 25 19 EF*7 ROOF KITCHEN HEAT EXHAUST GREENHECK GB*100 CENTRIFUGAL 700CFM .50" NEMA STANDARD 0.25 HP 25 19 F*1 FAN RM AHU*1 RELIEF PENN SX 205BA CENTRIFUGAL 5150CFM .5" NEMA STANDARD 2 25 10 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) F*2 FAN RM AHU*2 RELIEF PENN SX 95BA CENTRIFUGAL 1050CFM .5" NEMA STANDARD 0.75 HP 25 10 F*3 ROOF CLASSROOM EXHAUST PENN AB10 CENTRIFUGAL 360CFM .25" NEMA STANDARD 0.25 HP 25 10 F*4 FAN RM TOILET EXHAUST TWIN CITY FCJ CENTRIFUGAL 400CFM 0.25” NEMA STANDARD 1/6 HP 25 10 F*5 KITCHEN KITCHEN EXHAUST PENN AB10 CENTRIFUGAL 600CFM .37" NEMA STANDARD 0.25 HP 25 10 F*6 KITCHEN KITCHEN EXHAUST PENN Z6 CENTRIFUGAL 90CFM .12" NEMA STANDARD 1/25 HP 25 10 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Appendix D Energy Conservation Measures Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 1 Setback Thermostat: Cafeteria/Gymnasiu m Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Cafeteria/Gymnasium space. $705 $105 86.68 0.1 2 Setback Thermostat: Classrooms / Offices Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Classrooms / Offices space. $2,125 $471 58.23 0.2 3 Lighting: Corridor and Cafeteria Improve Manual Switching $1,228 $4,750 3.78 3.9 4 Lighting: Student Restrooms Add new Occupancy Sensor $76 $300 3.68 4 5 Lighting: Offices Replace with FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor and Improve Manual Switching $44 $200 3.19 4.6 6 Lighting: Corridor and Cafeteria Replace with 62 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $312 $1,500 3.04 4.8 7 Lighting: Corridor and Cafeteria Replace with 12 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Improve Manual Switching $884 $4,800 2.69 5.4 8 Lighting: Offices Add new Occupancy Sensor $75 $600 1.84 8 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 9 Lighting: Student Restrooms Replace with 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $43 $350 1.80 8.1 10 Lighting: Exterior Replace with 6 LED 72W Module StdElectronic $355 $3,000 1.73 8.4 11 Lighting: Student Restrooms Replace with 2 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic $34 $300 1.68 8.7 12 Other Electrical: P*3 & P*4 Replace with 2 Duplex Base*mounted Secondary Pumps $97 $794 1.61 8.2 13 Lighting: Staff Room Add new Occupancy Sensor $33 $300 1.60 9.1 14 Lighting: Corridor and Cafeteria Replace with 3 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Improve Manual Switching $131 $1,200 1.60 9.1 15 Lighting: Student Restrooms Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $32 $300 1.54 9.5 16 Exterior Door: Doors Remove existing door and install standard pre*hung U*0.16 insulated door, including hardware. $254 $4,099 1.44 16.2 17 Other Electrical: P*1 & P*2 Replace with 2 Boiler Primary Pumps $99 $926 1.39 9.3 18 Lighting: Student Restrooms Replace with 8 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic and Controls retrofit $138 $1,500 1.34 10.9 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 19 Lighting: Student Restrooms Replace with 10 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $149 $1,650 1.32 11.1 20 HVAC And DHW Replace lead boiler with a high efficiency condensing boiler $7,068 $125,000 1.31 17.7 21 Lighting: Exterior Replace with 11 LED 72W Module StdElectronic $502 $5,500 1.28 10.9 22 Lighting: Exterior Replace with 3 LED 150W Module StdElectronic $519 $6,000 1.26 11.6 23 Lighting: Corridor and Cafeteria Replace with 41 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $508 $6,450 1.15 12.7 24 Lighting: Exterior Replace with 2 LED 4W Module StdElectronic $379 $5,000 1.11 13.2 25 Air Tightening Perform air sealing to reduce air leakage by 20%. $1,029 $9,000 1.01 8.8 26 Lighting: Exterior Replace with 10 LED (2) 150W Module (2) StdElectronic $1,977 $40,000 0.72 20.2 27 Lighting: Corridor and Cafeteria Replace with 11 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $91 $1,950 0.69 21.3 28 Lighting: Corridor and Cafeteria Replace with 4 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $23 $500 0.67 21.9 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 29 Lighting: Custodian and Storage Replace with 5 FLUOR CFL, Spiral 26 W and Add new Occupancy Sensor $37 $900 0.60 24.2 30 Lighting: Offices Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $17 $450 0.55 26.5 31 Lighting: Custodian and Storage Add new Occupancy Sensor $6 $150 0.54 27 32 Lighting: Exterior Replace with 7 LED 150W Module StdElectronic $530 $14,000 0.53 26.4 33 Lighting: Kitchen Add new Occupancy Sensor $5 $150 0.50 29 34 Lighting: Gymnasium Replace with 16 FLUOR (6) T5 45.2" F54W/T5 HO Standard (2) StdElectronic $456 $14,250 0.47 31.3 35 Lighting: Kitchen Replace with 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $23 $750 0.44 33.2 36 Lighting: Custodian and Storage Add new Occupancy Sensor $26 $900 0.42 35.1 37 Exterior Door: 94 Addition Doors w/Windows Remove existing door and install standard pre*hung U*0.16 insulated door, including hardware. $55 $3,689 0.34 67.6 38 Lighting: Custodian and Storage Replace with 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $4 $150 0.34 42.8 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 39 Lighting: Kitchen Replace with 16 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $52 $2,400 0.32 46 40 Lighting: Classroom Replace with 128 FLUOR (2) T8 4' F32T8 32W Standard (2) Program StdElectronic $392 $19,200 0.30 48.9 41 Below* (part or all) Grade Wall: Orig. Const. Walls Install R*15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $726 $82,284 0.20 113.4 42 Other Electrical: P*5, P*6, & P*7 Replace with 3 Rooftop Glycol Pumps for AHU's $41 $2,643 0.20 64.9 43 Below* (part or all) Grade Wall: Orig. Const. Gym Wall Install R*15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $230 $26,809 0.20 116.4 44 Lighting: Classroom Toilet Add new Occupancy Sensor $2 $150 0.19 76.8 45 Lighting: Mechanical and Electrical Rooms Replace with 6 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $11 $900 0.17 85.6 46 Window/Skylight: Windows * North Face Replace existing window with U*0.35 wood window $182 $23,420 0.13 128.9 47 Window/Skylight: Windows * East Face Replace existing window with U*0.35 wood window $420 $54,097 0.13 128.9 48 Window/Skylight: Windows * West Face Replace existing window with U*0.35 wood window $671 $86,556 0.13 129 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 49 Window/Skylight: Windows * South Face Replace existing window with U*0.35 wood window $404 $55,868 0.12 138.1 50 Window/Skylight: Vestibule Windows Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $95 $13,300 0.12 140.5 51 Lighting: Staff Restrooms Add new Occupancy Sensor $2 $300 0.10 146.6 TOTAL $23,296 $629,862 0.64 27 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 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 41 Below* (part or all) Grade Wall: Orig. Const. Walls Wall Type: Masonry Insul. Sheathing: EPS Type VIII * psi 15, 2 inches Masonry Wall: 4" Concrete (lightweight) Modeled R*Value: 9.5 Install R*15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $82,284 $726 43 Below* (part or all) Grade Wall: Orig. Const. Gym Wall Wall Type: Masonry Insul. Sheathing: R*13 Batt:FG or RW, 2 inches Masonry Wall: 4" Concrete (lightweight) Modeled R*Value: 9.6 Install R*15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $26,809 $230 Exterior Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 16 Exterior Door: Doors Door Type: Entrance, R*1 Door (non*standard * not exterior) Modeled R*Value: 1 Remove existing door and install standard pre*hung U* 0.16 insulated door, including hardware. $4,099 $254 37 Exterior Door: 94 Addition Doors w/Windows Door Type: Entrance, Metal, EPS core, metal edge, half*lite Modeled R*Value: 3 Remove existing door and install standard pre*hung U* 0.16 insulated door, including hardware. $3,689 $55 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 46 Window/Skylight: Windows * North Face Glass: Double, glass Frame: Aluminum w/ Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U*Value: 0.62 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U*0.35 wood window $23,420 $182 47 Window/Skylight: Windows * East Face Glass: Double, glass Frame: Aluminum w/ Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U*Value: 0.62 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U*0.35 wood window $54,097 $420 48 Window/Skylight: Windows * West Face Glass: Double, glass Frame: Aluminum w/ Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U*Value: 0.62 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U*0.35 wood window $86,556 $671 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 49 Window/Skylight: Windows * South Face Glass: Double, glass Frame: Aluminum w/ Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U*Value: 0.62 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U*0.35 wood window $55,868 $404 50 Window/Skylight: Vestibule Windows Glass: Double, glass Frame: Aluminum w/ Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U*Value: 0.62 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $13,300 $95 Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 25 Air Tightness estimated as: 0.66 cfm/ft2 of above*grade shell area at 75 Pascals Perform air sealing to reduce air leakage by 20%. $9,000 $1,029 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 2. Mechanical Equipment Mechanical Rank Recommendation Installed Cost Annual Energy Savings 20 Replace lead boiler with a high efficiency condensing boiler $125,000 $7,068 Setback Thermostat Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 1 Cafeteria/Gymnasi um Existing Unoccupied Heating Setpoint: 65.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Cafeteria/Gymnasium space. $105 $705 2 Classrooms / Offices Existing Unoccupied Heating Setpoint: 65.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Classrooms / Offices space. $471 $2,125 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 3 Corridor and Cafeteria 19 FLUOR [Unknown Lamp] with Manual Switching Improve Manual Switching $4,750 $1,228 4 Student Restrooms 6 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $300 $76 5 Offices FLUOR T8 4' F32T8 32W Standard Program EfficMagnetic with Manual Switching Replace with FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor and Improve Manual Switching $200 $44 6 Corridor and Cafeteria 62 FLUOR T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Replace with 62 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,500 $312 7 Corridor and Cafeteria 12 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 12 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Improve Manual Switching $4,800 $884 8 Offices 21 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $600 $75 9 Student Restrooms 4 FLUOR (2) T8 4' F32T8 32W Standard Program EfficMagnetic with Manual Switching Replace with 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $350 $43 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 10 Exterior 6 HPS 150 Watt Magnetic with Manual Switching Replace with 6 LED 72W Module StdElectronic $3,000 $355 11 Student Restrooms 2 FLUOR (4) T12 4' F40T12 34W Energy*Saver (2) Magnetic with Manual Switching Replace with 2 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic $300 $34 13 Staff Room 11 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $300 $33 14 Corridor and Cafeteria 3 FLUOR T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 3 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Improve Manual Switching $1,200 $131 15 Student Restrooms 2 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $300 $32 18 Student Restrooms 8 FLUOR (4) T12 4' F40T12 34W Energy*Saver (2) Magnetic with Manual Switching Replace with 8 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic and Controls retrofit $1,500 $138 19 Student Restrooms 10 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 10 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,650 $149 21 Exterior 11 HPS 150 Watt Magnetic with Manual Switching Replace with 11 LED 72W Module StdElectronic $5,500 $502 22 Exterior 3 HPS 400 Watt Magnetic with Manual Switching Replace with 3 LED 150W Module StdElectronic $6,000 $519 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 23 Corridor and Cafeteria 41 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 41 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $6,450 $508 24 Exterior 2 HPS 750 Watt Magnetic with Manual Switching Replace with 2 LED 4W Module StdElectronic $5,000 $379 26 Exterior 10 HPS (2) 400 Watt (2) Magnetic with Manual Switching Replace with 10 LED (2) 150W Module (2) StdElectronic $40,000 $1,977 27 Corridor and Cafeteria 11 FLUOR T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 11 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,950 $91 28 Corridor and Cafeteria 4 FLUOR T8 4' F32T8 32W Standard Program EfficMagnetic with Manual Switching Replace with 4 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $500 $23 29 Custodian and Storage 5 INCAN A Lamp, Std 100W with Manual Switching Replace with 5 FLUOR CFL, Spiral 26 W and Add new Occupancy Sensor $900 $37 30 Offices 2 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $450 $17 31 Custodian and Storage 2 FLUOR (2) CFL, Plug*in 26W Quad Tube (2) Magnetic with Manual Switching Add new Occupancy Sensor $150 $6 32 Exterior 7 HPS 400 Watt Magnetic with Manual Switching Replace with 7 LED 150W Module StdElectronic $14,000 $530 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 33 Kitchen 2 FLUOR (2) CFL, Plug*in 26W Quad Tube (2) Magnetic with Manual Switching Add new Occupancy Sensor $150 $5 34 Gymnasium 16 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching, Occupancy Sensor Replace with 16 FLUOR (6) T5 45.2" F54W/T5 HO Standard (2) StdElectronic $14,250 $456 35 Kitchen 4 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $750 $23 36 Custodian and Storage 10 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $900 $26 38 Custodian and Storage 4 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching, Occupancy Sensor Replace with 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $150 $4 39 Kitchen 16 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 16 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $2,400 $52 40 Classroom 128 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching, Occupancy Sensor, Multi*Level Switch Replace with 128 FLUOR (2) T8 4' F32T8 32W Standard (2) Program StdElectronic $19,200 $392 44 Classroom Toilet FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $2 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 45 Mechanical and Electrical Rooms 6 FLUOR (2) T12 4' F40T12 34W Energy*Saver Magnetic with Manual Switching Replace with 6 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $900 $11 51 Staff Restrooms 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $300 $2 Other Electrical Equipment Rank Location Existing Recommended Installed Cost Annual Energy Savings 12 P*3 & P*4 2 Duplex Base*mounted Secondary Pumps with Manual Switching Replace with 2 Duplex Base*mounted Secondary Pumps $794 $97 17 P*1 & P*2 2 Boiler Primary Pumps with Manual Switching Replace with 2 Boiler Primary Pumps $926 $99 42 P*5, P*6, & P*7 3 Rooftop Glycol Pumps for AHU's with Manual Switching Replace with 3 Rooftop Glycol Pumps for AHU's $2,643 $41 ****************************************** AkWarmCalc Ver 2.1.4.0, Energy Lib 2/2/2012 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Appendix E Site Survey Photos Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 1. School, Main Entrance 2. School, North Face 3. Boilers, B*1, B*2 in Boiler Room 4. Base*mounted Pumps, P*3 and P*4 Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 5. Boiler Flue 6. Domestic Hot Water Heaters 7. Air Compressor in Boiler Room 8. AHU*3 in Boiler Room Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 9. AHU*1 in Fan Room 10. AHU*5 Rooftop Unit 11. Pipe Trench Access in Boiler Room 12. Rooftop Exhaust Fan, EF*4 13. Pneumatic Actuator for AHU*2 14. Refrigerators and Freezers in Kitchen Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 15. Entry Doors with Single Paned Glass 16. Exterior HPS lighting 17. T*12 Light Fixtures in Gymnasium Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Appendix F Thermographic Photos Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 Coffman Engineers made miscellaneous thermographic images of Birchwood ABC Elementary School using a FLIR T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate easy*to*identify heat losses. 1. Optical Image, North Face. Thermal Image below is indicated by the white border. 2. Thermographic Image, North Face. Temperatures indicated by color scale on right. Yellow indicates heat leakage. The outside temperature was about 8°F. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 3. Optical Image, North Face 1993 addition. Thermal Image to the right is indicated by the white border. 4. Thermographic image, North Face 1993 addition. Heat loss from metal window frames is expected. Heat loss around door frame can indicate a need for improved weather stripping. 5. Optical Image, West Face. Thermal Image is shown to the right. 6. Thermal Image, West Face. Heat lost along upper edge of precast concrete panels was observed. Birchwood ABC Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/18/2012 AkWarm No. CIRI*ANC*CAEC*14 7. Optical Image, South Face. Thermal image is shown at right. 8. Thermal Image, South Face. Heat losses were observed along gym building seam as well as at the tops of each precast concrete panel. End of Report