The URL can be used to link to this page

Home My WebLink AboutCIRI-ANC-CAEC Airpot heights Elementary School 2012 ENERGY AUDIT FINAL REPORT Airport Heights Elementary School 1510 Alder Drive Anchorage, AK 99517 p (907) 742(4550 AkWarm ID No. CIRI(ANC(CAEC(11 800 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 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 i AkWarm No. CIRI(ANC(CAEC(11 Contents I. Executive Summary .................................................................................................................. 1 II. Introduction .............................................................................................................................. 5 III. Energy Audit Process ............................................................................................................. 6 IV. Method of Analysis ................................................................................................................. 7 V. Building Description ................................................................................................................ 8 V.I SCHOOL ARCHITECTURAL DESCRIPTION .............................................................................................................. 9 V.II MECHANICAL DESCRIPTION ............................................................................................................................. 10 V.III ELECTRICAL DESCRIPTION .............................................................................................................................. 10 V.IV PORTABLE BUILDINGS DESCRIPTION .............................................................................................................. 11 VI. Historic Energy Consumption and Cost............................................................................. 13 VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 13 VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 13 VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 13 VII. Equipment Inventory and Photo Survey .......................................................................... 15 VIII. Energy Conservation Measures ....................................................................................... 16 VIII.I SCHOOL ENERGY CONSERVATION MEASURES ............................................................................................... 16 VIII.II PORTABLE BUILDING ECMS ......................................................................................................................... 21 VIII.III ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ....................................... 23 Appendices Appendix A – Energy Benchmark Data Appendix B – AkWarm Commercial Reports Appendix C – Major Equipment List Appendix D – Energy Conservation Measures – Airport Heights Elementary School Appendix E – Energy Conservation Measures – Portable Buildings Appendix F – Site Survey Photos Appendix G – Thermographic Photos Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 ii AkWarm No. CIRI(ANC(CAEC(11 Abbreviations AHES Airport Heights Elementary School 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 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 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 iii AkWarm No. CIRI(ANC(CAEC(11 List of Figures Fig. 1 – Energy Audit Clients ....................................................................................................................... 1 Fig. 2 – Energy Benchmark Data .................................................................................................................. 1 Fig. 3 – Anchorage, Alaska – Google Maps ................................................................................................. 5 Fig. 4 – Airport Heights Elementary School – Google Maps ....................................................................... 5 Fig. 5 – Airport Heights Elementary School Floor Plan ............................................................................... 8 Fig. 6 – Un(insulated Roof Area over Office Corridor from the Rooftop .................................................. 17 Fig. 7 – Un(insulated Roof Area over Office Corridor ............................................................................... 18 List of Tables Table 1 ( Recommended Energy Conservation Measures, Airport Heights Elementary School .................. 2 Table 2 ( Recommended Energy Conservation Measures, Portable Buildings ............................................ 4 Table 3 ( Building History ............................................................................................................................ 8 Table 4 ( Energy Cost and Consumption Data ........................................................................................... 13 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 iv AkWarm No. CIRI(ANC(CAEC(11 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. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 1 AkWarm No. CIRI(ANC(CAEC(11 I. Executive Summary This report presents the findings of an energy audit conducted at Airport Heights Elementary School 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 $52,479 Natural Gas $30,998 Total $83,477 January 2009(December 2010 Energy Utilization Index (EUI) = 113.4 kBtu/sf January 2009(December 2010 Energy Cost Index = 1.97 $/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. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 2 AkWarm No. CIRI(ANC(CAEC(11 Table 1 6 Recommended Energy Conservation Measures, Airport Heights Elementary School Executive Summary – Recommended ECMs Airport Heights Elementary School (AHES) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) AHES(1a Refrigerators Replace residential & light commercial refrigerators/freezers older than 5 years old ( ( ( <10 AHES(2 Setback Thermostat: Offices and MPR Implement a heating temperature unoccupied setback to 60 deg F for the school $379 $800 6.12 2.1 AHES(3 Lighting: Corridors Replace T12 lighting with T8 fixtures, and add new occupancy sensors $2,570 $6,050 6.21 2.35 AHES(4 Lighting: Library Add new occupancy sensors $226 $1,200 2.75 5.31 AHES(5 Building: Uninsulated Roof Area Install a minimum of R(10 rigid insulation to uninsulated roof area at location of decommissioned AHU(11 above school office corridor. $20 $200 2.35 10.0 AHES(6 Building: Utilidor/Foun dation Wall Install R(10 rigid insulation to exterior side of foundation wall. $1,417 $15,000 2.19 10.58 AHES(7 Lighting: Classrooms Replace T12 lighting with T8 fixtures, and add new occupancy sensors $1,027 $7,450 1.94 7.25 AHES(8 Lighting: Multipurpose Room Replace the Metal Halide light fixtures with T5HO fixtures, add new occupancy sensors $1,338 $12,000 1.69 8.65 AHES(9 Lighting: Offices and Staff Rooms Add new occupancy sensors $129 $1,200 1.57 9.30 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 3 AkWarm No. CIRI(ANC(CAEC(11 Executive Summary – Recommended ECMs Airport Heights Elementary School (AHES) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) AHES(10 Lighting: Exterior Replace the building mounted High Pressure Sodium light fixtures with LED fixtures $927 $9,000 1.5 9.71 AHES(11 Lighting: Data Room Add a new occupancy sensor $14 $150 1.5 10.71 AHES(12 Air Tightening Perform air sealing to reduce air leakage by 20% $1,267 $9,000 1.25 7.1 AHES(13 Setback Thermostat: Classrooms Implement a heating temperature unoccupied setback to 60.0 deg F for the classroom space $3,554 $40,000 1.15 10.1 AHES(14 Lighting: Restrooms Replace T12 lighting with T8 fixtures, and add new occupancy sensors $112 $1,500 1.08 13.39 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. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 4 AkWarm No. CIRI(ANC(CAEC(11 Table 2 6 Recommended Energy Conservation Measures, Portable Buildings Executive Summary – Recommended Energy Conservation Measures (ECMs) Portable Building (PB) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) PB(1 Portable Building Skirting Install R(15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $1,004 $1,650 11.69 1.6 PB(2 Ceiling W/Attic: Portable Building – Cold Roof Add R(33 blown cellulose insulation to attic with Standard Truss $248 $2,070 2.30 8.3 PB(3 Setback Thermostat: Portable Building Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Portable Building space $327 $2,000 1.92 6.1 PB(4 Portable Lighting Replace T12 lighting with T8 fixtures, and add new occupancy sensors. Replace the exterior High Pressure Sodium fixtures with LED light fixtures $344 $3,550 1.42 10.32 PB(5 Exterior Door: Portable Building ( Doors Remove existing door and install standard pre(hung U(0.16 insulated door, including hardware. $54 $820 1.27 15.2 PB(6 Air Tightening Perform air sealing to reduce air leakage by 30%. $111 $850 1.10 7.7 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 5 AkWarm No. CIRI(ANC(CAEC(11 II. Introduction This energy audit was conducted at Airport Heights Elementary School (AHES) for AHFC and the Anchorage School District. The school is a 45,635 square foot (sf) that includes a 40,835 sf school and 4,800 sf of portables. 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 – Anchorage, Alaska – Google Maps Fig. 4 – Airport Heights Elementary School – Google Maps Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 6 AkWarm No. CIRI(ANC(CAEC(11 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 February 13, 2012. The audit included 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) Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 7 AkWarm No. CIRI(ANC(CAEC(11 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 kitchen, offices, multipurpose room, 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. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 8 AkWarm No. CIRI(ANC(CAEC(11 V. Building Description Airport Heights Elementary School is a single story building consisting of classrooms, administrative offices, a multipurpose room, a library, and several utility spaces. The school is arranged with a north and a south wing of classroom spaces. The multipurpose room, library, and administrative offices are located in the center of the school, shown in Figure 3 below. Fig. 5 – Airport Heights Elementary School Floor Plan The school was originally constructed in 1954 and the library and administrative offices were expanded in 1972. The school has undergone several changes throughout its history, including heating sytem upgrades, lighting renovations, and reroofing projects. A brief list of the major renovation projects and years completed are shown below. Table 3 6 Building History Airport Heights Elementary – Building History* Date Addition or Renovation 1954 Original Construction 1972 Expansion of Library and Administrative Offices 1984 Re-Roof of Entire School 1986 Unit Ventilator Replacement in Classrooms 1987 Emergency Exit Door Installation and Code Upgrades 1988 CUV Replacement and Office Ventilation Upgrade 1990 Playground and Outdoor Improvements 1991 Heating System Upgrades 1998 Electrical System Upgrades 2004 HVAC Upgrades 2005 Window & Exterior Finish Replacement 2006 Fire Protection & Intercom Upgrades *History is based on available drawings from ASD. Airport Heights Elementary School is occupied by approximately 351 people from 7am until 6pm weekdays for school and after(school activities from August through May. A night janitorial staff works Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 9 AkWarm No. CIRI(ANC(CAEC(11 from 3:30pm until 12am. The Anchorage School District offers a library program from 9am to 1pm from May through the end of June. The school is unoccupied for the month of July. The multipurpose room, art room, library, and outdoor ball fields are utilized by the community through the ASD rental program throughout the year with some events lasting until 10pm once per week. V.I School Architectural Description Details of the wall, floor, and roof construction were examined on the architectural drawings and confirmed during the site survey. There are three different wall types throughout the school. The exterior walls of the classroom wings are constructed of 2”x6” studs with 16” centers, R(13 insulation infill, 5/8” plywood sheathing, and aluminum(clad plywood panel siding for an estimated overall R(value of R(15.5. The classroom walls are approximately 12’ high. The exterior walls of the multipurpose room are constructed of 2”x8” studs on 16” centers, R(19 insulation infill, 5/8” plywood sheathing, and aluminum( clad plywood panel siding for an estimated overall R(value of R(19.4. These walls are approximately 18’ high. Exterior walls surrounding the school’s mechanical boiler room are approximately 11’ high and are constructed of 8” poured concrete with aluminum(clad plywood panel siding that provide an estimated R( value of R(2.7. The school was constructed with a 3’ wide by 4’ deep, below(grade utilidor which extends along the perimeter of the original construction. The construction drawings indicate that the utilidor walls are comprised of 8” poured concrete with 2” rigid insulation on the interior face extending the full length of the wall. However, a significant amount of heat loss was observed from the utilidor wall, and the energy audit team does not believe the as(built condition matches the architectural drawings. Due to confined space restriction, the utilidor was not entered or examined. The estimated insulation value of the utilidor wall was modeled at R(5.8. There is approximately 12,473 sf of above(grade wall area and 4,684 sf of below(grade wall area. The school has slab(on(grade floors with 2” extruded rigid insulation that appears below the slab edge and extends at least 3’ below grade, providing an estimated R(value of R(8.3 There is approximately 39,951 sf of slab on grade floors and a total of 40,835 sf usable area. The usable area is greater than the slab(on( grade floors due to a fan room located in a mechanical mezzanine. Roof construction for the school is a built up flat roof containing 5/8” exterior plywood attached to the roof trusses, 1” extruded rigid insulation, a single ply membrane roofing, 2” rigid insulation under 3” rigid insulation topped with pavers. The approximate R(value for the roof construction is R(26. There is approximately 39,951 sf of roof area. Most of the school’s windows were replaced in a 2005 renovation project. The new windows consist of double pane, clear glass with a 1/2" air space between the panes and aluminum clad wood frames. An estimated insulating value of R(1.8 was given to these windows. Windows along the library and administrative office addition were installed in 1972 and were not replaced in the 2005 project. These windows consist of double pane, clear glass with a 1/2" air space between the panes and aluminum frames. An estimated insulating value of R(1.2 was given to these windows. The windows surrounding the entryway doors were installed during original construction and consist of 1/4” plate glass with aluminum frames providing an R(value of R(0.8. There is approximately 4,000 sf of total window area. The school has 21 insulated half(lite metal doors providing an estimated R(value of R(2.2. There are 10 insulated, hollow metal, utility doors which provide an R(value of R(2.5. Entryway doors along the east and west face of the school building consist of 1/4” plate glass with aluminum frames and were included as a window in the AkWarm model with an R(value of R(1.2. There is approximately 651 sf of door area. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 10 AkWarm No. CIRI(ANC(CAEC(11 V.II Mechanical Description The school is heated with two Weil(McLain 988 series, gas fired, cast iron sectional boilers with an input rating of 2,713 million BTUs per hour (MBH). The boilers were installed in 1992 and are each equipped with a Gordon Piatt R8.4(G(20 burner. The building is heated using a primary(secondary system. The heating medium in the primary loop, through the boilers, is water, which then heats the secondary glycol loop using a plate(and(frame heat exchanger. Space heating, which uses the secondary glycol loop, is accomplished through a combination of cabinet unit heaters, radiant floor heating, perimeter fin(tube, and unit ventilators. Tempered air for the multipurpose room, kitchen, library, and main office area is provided by heating coils located in each fan room. Ventilation and heating for the classroom spaces is provided by unit ventilators located in each classroom. No mechanical cooling is provided for any systems in the facility. There are three air handling units (AHUs) serving Airport Heights Elementary School. All air handling units are appropriately sized for their different applications. Since there are several eras of projects at AHES, equipment is identified by its tag and its estimated installation year. AHU(2 (1991) is a constant volume unit equipped with a 1 horsepower (HP) fan motor and provides the boiler room with 2,550 cubic feet per minute (CFM) of air. AHU(11 (2004) is a constant volume unit comprised of a 5 HP supply fan motor and provides the office and library areas with 5,330 CFM. It operates in a supply(relief fan combination system with exhaust fan EF(11, which is equipped with a 1 HP fan motor. AHU(21 (2004) is a constant volume unit comprised of a 10 HP supply fan motor and provides the multipurpose room and kitchen areas with 10,050 CFM of air. It operates in a supply(relief fan combination system with exhaust fan EF(21, which is equipped with a 7.5 HP fan motor. EF(22 is a constant volume exhaust fan equipped with a 1/3 HP fan motor that is interlocked with AHU(21. It serves the kitchen hood by exhausting 1,750 CFM of air. See Appendix C, Major Equipment List, for a detailed list of major ventilation equipment. A gas(fired water heater, a Rheem R156(40, with a 38 gal storage tank and an input rating of 156MBH provides domestic hot water to the school. The domestic water line has hot water recirculation which uses a Grundfos UPS(15(55(SFC in(line circulation pump. The school’s building energy management and control system is controlled using a Direct Digital Control system, however, some pneumatic actuators still remain in use. These actuators are operated by an air compressor using a 5 HP motor. The system appeared to be in fair working order but was observed to be cycling on and off frequently. 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. V.III Electrical Description The school is served by an 800 amp (A), 120/208 volt (V), three phase, 4(wire, underground electrical service connected to a pad mounted utility transformer. Power is distributed through the school to several distribution panels that serve local electrical loads. Most fluorescent light fixtures in the school utilize T8 lamps and electronic ballasts, however there were a few T12 light fixtures present with magnetic ballasts throughout the school. 8' T12 light fixtures were observed in the school’s campfire room. The lighting levels throughout the school were observed to be adequate and within the suggested lighting levels from the Illumination Engineering Society of North America (IESNA). Occupancy sensors were observed in a few of the offices while all of the fixtures in the library and classrooms are controlled by wall switches. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 11 AkWarm No. CIRI(ANC(CAEC(11 The lighting in the corridors is provided by 4' T8 and T12 light fixtures. These fixtures are turned off nightly by switching off the circuit breaker. Approximately 50% of the light fixtures in the school’s corridors are used as nightlights and are never switched off. Incandescent light fixtures were observed in two locations in the school. One fixture was located in a the kitchen restroom and one other fixture was located in a storage room. The multipurpose room (MPR) is illuminated with approximately (16) 400 watt (W) high bay metal halide (MH) light fixtures. Long strike times are inherent with MH light fixtures and, due to this feature, the lights are typically left switched on during extended periods of time while the space is unoccupied. The MPR is one area of the school where the lighting levels may be reduced without affecting the performance of the room. Exterior lighting consists of 150W high pressure sodium (HPS) canopy lights, 100W and 150W HPS wall pack lights and 400W HPS pole mounted parking lot lights. 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. V.IV Portable Buildings Description There are three portable buildings located on the Airport Heights Elementary School campus. They are utilized as classroom space from 8 a.m. until 4 p.m. on weekdays during the school year. One portable is occupied until 4:30 p.m. one day per week for afterschool activities. Two of the portables were constructed in 1992 and one was constructed in 1965. The portables use electricity for heating, lighting and other plug loads. Due to the fact that the three portables have similar building envelope construction and heating equipment, only one AkWarm model was created to model the average characteristics of all three portables. The results and recommended ECMs generated by this single portable AkWarm model should be applied to all of the three portable buildings. Each portable has 2”x4” wood stud walls on 16” centers with R(11 fiberglass batt insulation for a combined R(value of R(10.6. The exterior face of the wall is T1(11 siding with drywall on the interior. Interior and exterior wall height is 9’ under the roof eaves, and the end walls vary in height from 9’ at the eaves to 11’ at the roof peak in the center of the end wall. One portable typically has 1,170 sf of exterior wall area. The portables have above(grade floors resting on sleepers. Plywood skirting protects the sleepers and floor construction from the weather. The floor construction is plywood flooring resting on 2”x8” wood joists. It is estimated that the floor has R(19 fiberglass batt insulation. One portable typically has 960 sf of floor area. The portables are all covered by sloped cold roofs, with shingles covering plywood decking. It is estimated that the roof insulation is R(19 fiberglass batt insulation. One portable typically has approximately 990 sf of roof area. This is greater than the floor area due to the sloped roof. There are two double pane, wood framed windows in each portable with an estimated R(value of R(1.8. There are two insulated metal doors with an R(value of R(2.5 for each door. One portable typically has 42 sf of window area and 18 sf of door area. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 12 AkWarm No. CIRI(ANC(CAEC(11 All three portables are heated with electric resistance perimeter baseboards and electric unit heaters. The electric baseboard temperature set point is controlled by a dial thermostat on each individual baseboard. The relatively high number of baseboards with individual thermostats results in baseboards that are frequently left on at higher settings than required for adequate space heating in each portable. Due to the need to keep these buildings moveable and due to combustion safety issues, the Anchorage School District states its desire to keep all portable buildings on electric heat and not utilize natural gas heating at this time. A 120/208V single phase overhead feeder is supplied to each of the portable buildings from the school building. Each portable building is provided with a small distribution panel where the feeder terminates. The distribution panel distributes power to the portable's lighting, heating, and receptacles. The lighting in the portables is provided by (34) two(lamp, and (24) four(lamp, 4’ long, T12 light fixtures with magnetic ballasts. The 4’ fluorescent fixtures are controlled by wall switches. Exterior lighting at each portable is provided by a 70W HPS wall pack located adjacent to the main entrance door. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 13 AkWarm No. CIRI(ANC(CAEC(11 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. Chugach Electric provides the electricity and ENSTAR 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 heating oil 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 space heater 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 4 6 Energy Cost and Consumption Data Energy Cost and Consumption Data 2009 2010 Average Electric 0.12 $/kWh 0.11 $/kWh 0.12 $/kWh Natural Gas 1.01 $/CCF 0.89 $/CCF 0.95 $/CCF Total Cost $85,298 $81,655 $83,477 ECI 1.87 $/sf 1.79 $/sf 1.83 $/sf Electric EUI 33.6 kBtu/sf 34.2 kBtu/sf 33.9 kBtu/sf Natural Gas EUI 71.5 kBtu/sf 71.5 kBtu/sf 71.5 kBtu/sf Building EUI 105.1 kBtu/sf 105.7 kBtu/sf 105.4 kBtu/sf The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The building square footage was calculated to be approximately 45,635 sf. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 14 AkWarm No. CIRI(ANC(CAEC(11 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. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 15 AkWarm No. CIRI(ANC(CAEC(11 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 F. 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 G. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 16 AkWarm No. CIRI(ANC(CAEC(11 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# AHES61 – Replace residential & light commercial refrigerators/freezers older than 5 years old Annual Energy Savings Installed Cost SIR Payback (years) ( ( ( <10 years Due to advances in refrigerators in the previous five years, new Energy Star residential(type and light commercial(type refrigerators and freezers are much more efficient and result in viable energy savings. Built(in refrigerators and freezers should be evaluated independently. Replacing existing refrigerators that are five years old or greater will typically have paybacks of less than 10 years. ECM # AHES62– Setback Thermostat in Office and MPR areas Annual Energy Savings Installed Cost SIR Payback (years) $379 $800 6.12 2.1 Currently, there is a night set back schedule that lowers building temperatures to 65F during unoccupied mode. However, even greater energy savings exist by reducing the room temperature of the office and MPR areas further to 60F 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 cost of this ECM only includes the time required to program a night setback. The 60F night set back is feasible; however it may require that the other DDC set points be changed, such as the low(temp alarm. This ECM is a compilation of items 4 and 5 in Appendix D, which are intended to be implemented concurrently. Details of the individual items are shown in Appendix D. ECM # AHES63 6 Upgrade the Corridor Lighting and Controls Annual Energy Savings Installed Cost SIR Payback (years) $2,570 $6,050 6.21 2.35 There are approximately (16) single(lamp, (6) two(lamp, and (1) four(lamp fluorescent T12 light fixtures, and (75) two(lamp fluorescent T8 light fixtures used for lighting in the corridors. These light fixtures are controlled by switching their branch circuit breakers on and off. The as(built electrical wiring is configured to utilize 50% of the fixtures for night lights. It is recommended that all of the T12 light fixtures be replaced by T8 fixtures with an equal number of lamps. Additional savings can be realized by providing several occupancy sensors throughout the corridors to switch all of the light fixtures off while the space is unoccupied. See items 1, 3, 6, 8, 10, 22, and 24 in Appendix D for further details. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 17 AkWarm No. CIRI(ANC(CAEC(11 ECM # AHES646 Upgrade the Library Lighting Controls Annual Energy Savings Installed Cost SIR Payback (years) $226 $1,200 2.75 5.31 There are approximately (31) 4' suspended three(lamp direct/indirect light fixtures that are used to light the library. These fixtures were observed to be switched in six separate zones by a multi(gang light switch bank located in the adjacent main office. It is recommended that approximately six new ceiling mounted occupancy sensors be installed to switch the libraries light fixtures off when the space is unoccupied. See item 11 in Appendix D for further details. ECM # AHES65 – Install Rigid Insulation to the Un6insulated Roof Area above the Office Corridor Annual Energy Savings Installed Cost SIR Payback (years) $20 $200 2.35 10.0 During the 2004 HVAC upgrade project, the existing office area air handler, AHU(11, was removed from the roof over the office corridor. The footprint area of the AHU did not appear to be insulated after removal. Currently, there is a 7’x3’ section of un(insulated roof area which allows a significant amount of heat loss to communicate through the roof. Figure 6, below, shows the area, void of snow, from the roof top. Fig. 6 – Un6insulated Roof Area over Office Corridor from the Rooftop Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 18 AkWarm No. CIRI(ANC(CAEC(11 Figure 7, below, shows the area from inside the building. Fig. 7 – Un6insulated Roof Area over Office Corridor Significant energy savings can be achieved by installing a minimum of R(10 rigid insulation to the interior side of the roof in this area. The installed cost includes labor and materials. See item 2 in ppendix D for further details. ECM # AHES66 – Install Rigid Insulation to the Foundation Wall Annual Energy Savings Installed Cost SIR Payback (years) $1,417 $15,000 2.19 10.58 Significant heat loss was observed through the foundation wall along the perimeter of the school. A poorly insulated utilidor runs along the perimeter of the school utilizing the foundation wall. The utilidor walls are 4’ deep with 1.5’ of above(grade wall. This ECM recommends installing 2x8 sheets of R(10 rigid insulation to the exterior of the utilidor, including an exterior surface and flashing. The installed cost incorporates materials and an excavation and installation labor estimate. See item 12 in Appendix D for more information. ECM # AHES67 6 Upgrade the Classroom Lighting and Controls Annual Energy Savings Installed Cost SIR Payback (years) $1,027 $7,450 1.94 7.25 With the exception of room 42 all of the classrooms are illuminated with T8 fixtures with bi(level switching and electronic ballasts and are controlled by wall mounted rocker switches. Room 42 is illuminated with (8) 8' two(lamp T12 high output light fixtures that are controlled by a wall switch. Since the lighting levels in this area exceed the recommendations by the IESNA the lighting may be reduced in this space with no loss of performance. It is suggested that the T12 light fixtures be replaced one(for(one by four(lamp 4' T8 fluorescent light fixtures. Additionally each classroom should be provided a ceiling mounted occupancy sensor to control the light fixtures. See items 9, 18, 33, and 36 in Appendix D for further details. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 19 AkWarm No. CIRI(ANC(CAEC(11 ECM # AHES68 6 Upgrade the Lighting in the Multipurpose Room Annual Energy Savings Installed Cost SIR Payback (years) $1,338 $12,000 1.69 8.65 The existing lighting in the MPR consists of (16) 400W high bay MH light fixtures. The lighting level in the room was measured at 70 foot candles which is above the IESNA's suggested lighting levels for this type of space. Therefore, the lighting may be reduced without any loss in performance in the use of the space. This ECM consists of the replacement of the existing MH fixtures one(for(one with four(lamp T5HO light fixtures, and to provide four wall mounted occupancy sensors with wire(guards. Though it was not modeled, additional savings can be realized by implementing bi(level switching with this upgrade. See item 14 in Appendix D for more information. ECM # AHES69 6 Upgrade the Lighting Controls in the Offices and Staff Rooms Annual Energy Savings Installed Cost SIR Payback (years) $129 $1,200 1.57 9.30 All of the lighting in the offices and staff rooms is provided by 4' fluorescent T8 light fixtures. The lighting in five of these spaces is controlled by occupancy sensors, while the lighting in the remaining eight rooms is controlled by wall mounted rocker switches. This ECM consists of providing approximately eight new ceiling mounted occupancy sensors so that all of the offices and staff rooms are controlled by occupancy sensors. See items 7, 21, and 26 in Appendix D for more information. ECM # AHES610 6 Upgrade the Exterior Lighting Annual Energy Savings Installed Cost SIR Payback (years) $927 $9,000 1.5 9.71 The exterior lighting at the site consists of (6) 100W HPS wall packs, (8) 150W HPS canopy lights, (2) 150W HPS wall packs, and (20) 400W HPS pole mounted "shoebox" area lighters. All of the exterior lighting is controlled by photocell that switches the lights on while it is dark. Additionally, the parking lot lights are controlled by an input from the DDC system that shuts them off while the security system is alarmed. The building mounted light fixtures remain on all night. This ECM would replace the 100W and 150W building mounted light fixtures one(for(one with 50W and 72W LED light fixtures, respectively. This assumes the re(use of existing wiring. Upgrading the parking lot 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 15, 16, and 19 which were individually modeled in AkWarm. See Appendix D for details of individual measures. ECM # AHES611 6 Upgrade the Data Room Lighting Annual Energy Savings Installed Cost SIR Payback (years) $14 $150 1.5 10.71 The data room (room 115) adjacent to the main office is illuminated by two 23W Compact Fluorescent Lamps (CFL) that switch with the same circuit as the adjacent staff room. It is recommended that a ceiling mounted occupancy sensor be installed in the data room to switch these lights off while the space is not occupied. See item 17 in Appendix D for more information. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 20 AkWarm No. CIRI(ANC(CAEC(11 ECM # AHES612 – Perform Air Sealing to Reduce Air Leakage by 20% Annual Energy Savings Installed Cost SIR Payback (years) $1,267 $9,000 1.25 7.1 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 though 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. To achieve a viable economic benefit, up to $9,000 can be invested and still achieve an SIR ≥ 1by reducing air leakage by 20%. See item 20 in Appendix D for more information. ECM # AHES613– Setback Thermostat in the Classrooms Annual Energy Savings Installed Cost SIR Payback (years) $3,966 $40,000 1.28 10.1 Each classroom has a unit ventilator with an individual pneumatic thermostat. The unit ventilator provides tempered outdoor air using hydronic heat supplied by the heating system. The current thermostat control system does not allow for an automatic night setback during unoccupied times. Significant energy savings exist by reducing the room temperature of each classroom to 60F during unoccupied times. Lowering the heat load of the building will reduce natural gas consumption. The cost of this ECM includes replacing 20 existing thermostats with new programmable thermostats each with an associated electronic to pneumatic transducer in each classroom at a cost of $2,000 per thermostat. Each thermostat will be individually programmed for an unoccupied setback. See item 21 in Appendix D for more information. ECM # AHES614 6 Upgrade the Restroom Lighting and Control Annual Energy Savings Installed Cost SIR Payback (years) $112 $1,500 1.08 13.39 The lighting in the student restrooms is provided by (20) two lamp 4' T8 fluorescent light fixtures, (5) in each of the four spaces. These light fixtures are controlled by keyed wall switches. The two staff restrooms located near the main office are each illuminated by a single 3' two(lamp T12 fluorescent vanity light. It is recommended that the T12 light fixtures are replaced one(for(one with 4' single(lamp T8 fixtures and that wall mounted occupancy sensors are installed in the staff restrooms. One ceiling mounted occupancy sensor should be installed in each of the student restrooms. See items 13 and 34 in Appendix D for more information. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 21 AkWarm No. CIRI(ANC(CAEC(11 VIII.II Portable Building ECMs There are three portable buildings that exist on(site and are connected to the electrical service of Airport Heights Elementary School. A typical AkWarm model was created to model the typical portable, due to similarities in construction type and heating systems. The following ECM savings and installed costs are for one portable building. Multiply the results by three to obtain savings and costs for all three portables combined. ECM #PB61 – Add Insulation to Portable Skirting Annual Energy Savings Installed Cost SIR Payback (years) $1,004 $1,650 11.69 1.6 The portable has un(insulated plywood skirting which protects the above grade floor from the weather. The skirting is estimated to have an R(value of R(3.0. Installing R(15 rigid insulation to the interior side of the portable skirting will reduce heat loss and reduce electricity consumption. See item 1 in Appendix E for more information. ECM #PB62 – Add Insulation to the Attic Annual Energy Savings Installed Cost SIR Payback (years) $248 $2,070 2.30 8.3 The existing cold roof on the portable has an estimated insulating value of R(21. Improving the insulating value will reduce the energy required to maintain setpoint temperatures within the portable. Adding R(33 blown cellulose insulation to the attic space will provide an energy savings of approximately $248 per year. See item 2 in Appendix E. ECM #PB63 – Setback Thermostat Annual Energy Savings Installed Cost SIR Payback (years) $327 $2,000 1.92 6.1 Significant energy savings exist by reducing the room temperature of the portable building during unoccupied times. However, due to the fact that the portable building has perimeter electric baseboard heaters, each with individual dial thermostats, it is difficult to obtain a desired set point in the portable building. As a result, the temperature in the portable is typically much higher than required. Also, the temperature cannot be set back during unoccupied times. It is recommended that a central programmable thermostat be installed in the portable building that can turn the perimeter electric baseboards on or off to control occupied and unoccupied temperature set points. Reducing the portable temperature from 65 deg F to 60 deg F during unoccupied times will save $327 annually in electricity bills. See item 3 in Appendix E for more information. ECM #PB64 – Upgrade Portable Building Lighting Annual Energy Savings Installed Cost SIR Payback (years) $344 $3,550 1.42 10.32 Between the three portables, the interior lighting in the portables is currently provided by (34) two(lamp, and (24) four(lamp fluorescent T12 light fixtures with magnetic ballasts. The T12 fixtures should be replaced one(for(one with two(lamp T8 fluorescent light fixtures with electronic program start ballasts. The HPS wall packs should also be replaced one(for(one with a 35W LED fixture. It is also recommended that each of the three portables be provided with a new ceiling mounted occupancy sensor to switch the Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 22 AkWarm No. CIRI(ANC(CAEC(11 lights off when the space is unoccupied. The values presented above for the annual energy savings and installed cost are the calculated average cost for the ECM and represent the projected savings and installed cost for one portable. This description is for a compilation of several ECMs that are intended to be implemented at the same time, however due to constraints with the AkWarm modeling software the different lighting configurations were modeled separately. See items 4, 5, and 8 in Appendix E for details of individual measures. ECM #PB65 – Replace Exterior Doors Annual Energy Savings Installed Cost SIR Payback (years) $54 $820 1.27 15.2 Each portable building has two poorly insulated (R(1.7) metal doors. It is recommended that both doors be removed and replaced with new R(6.25 minimum (U(0.16) insulated doors. The new doors should have proper weather stripping on them to reduce air infiltration. See item 6 in Appendix E for more information. ECM #PB66– Seal Building Envelope and Reduce Infiltration by 30% Annual Energy Savings Installed Cost SIR Payback (years) $111 $850 1.10 7.7 By tightening the portable building envelope with air sealing improvements, infiltration into the portable will be reduced. This in turn will reduce the heating load and reduce the amount of electricity being used by the electric heaters. While a blower door test was not completed, it is anticipated that air leakage is occurring around old weather stripping around doors, window frames, and wall and roof penetrations. Methods to decrease the infiltration into the portable include: sealing around the windows and doors with caulking and insulation, adding new weather stripping to doors, and sealing any roof and wall penetrations. To achieve a viable economic benefit, up to $850 can be invested and still achieve an SIR ≥ 1by reducing air leakage by 30%. See item 7 in Appendix E for more information. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 23 AkWarm No. CIRI(ANC(CAEC(11 VIII.III 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. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix A Energy Benchmark Data 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 351 Renovations Date 1510 Alder Dr Golab_Steven@asdk12.org Details Mailing Address City Anchorage Facility Zip 261,500 99517 Email Facility Address Anchorage Primary Operating Hours Contact Person Mixed Community Population Facility City REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner MOA Facility Owned By 1954 Date Municipal Government/Subdivision Airport Heights Elementary Education - K - 12 45,635 Year Built Building Name/ Identifier Building Usage Building Square Footage Building Type 07/22/11 Date 1954 1973 PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton Other energy sources? Describe Details 35830 SF Original 5005 SF Addition 5 portables @ 960 sf = 4800 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. Airport Heights Elementary Buiding Size Input (sf) =45,635 2009 Natural Gas Consumption (Therms)32,637.00 2009 Natural Gas Cost ($)32,857 2009 Electric Consumption (kWh)448,680 2009 Electric Cost ($)52,441 2009 Total Energy Use (kBtu)4,795,045 2009 Total Energy Cost ($)85,298 Annual Energy Use Intensity (EUI) 2009 Natural Gas (kBtu/sf) 71.5 2009 Electricity (kBtu/sf)33.6 2009 Energy Utilization Index (kBtu/sf)105.1 Annual Energy Cost Index (ECI) 2009 Natural Gas Cost Index ($/sf)0.72 2009 Electric Cost Index ($/sf)1.15 2009 Energy Cost Index ($/sf)1.87 2010 Natural Gas Consumption (Therms)32,620.00 2010 Natural Gas Cost ($)29,139 2010 Electric Consumption (kWh)457,745 2010 Electric Cost ($)52,516 2010 Total Energy Use (kBtu)4,824,2842010 Total Energy Use (kBtu)4,824,284 2010 Total Energy Cost ($)81,655 Annual Energy Use Intensity (EUI) 2010 Natural Gas (kBtu/sf)71.5 2010 Electricity (kBtu/sf)34.2 2010 Energy Utilization Index (kBtu/sf)105.7 Annual Energy Cost Index (ECI) 2010 Natural Gas Cost Index ($/sf)0.64 2010 Electric Cost Index ($/sf)1.15 20010 Energy Cost Index ($/sf)1.79 Note: 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's Airport Heights ElementaryNatural GasBtus/CCF =100,000Provider Meter # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC149111 Jan-09 01/09/09 02/10/09325,4215,421$5,496$1.01Enstar NGC149111 Feb-09 02/10/09 03/09/09274,2464,246$4,318$1.02Enstar NGC149111 Mar-09 03/09/09 04/09/09313,7423,742$3,817$1.02Enstar NGC149111 Apr-09 04/09/09 05/08/09292,1952,195$2,265$1.03Enstar NGC149111 May-09 05/08/09 06/10/09331,2901,290$1,355$1.05Enstar NGC149111 Jun-09 06/10/09 07/10/0930850850$915$1.08Enstar NGC149111 Jul-09 07/10/09 08/11/0932781781$846$1.08Enstar NGC149111 Aug-09 08/11/09 09/11/0931893893$960$1.08Enstar NGC149111 Sep-09 09/11/09 10/12/09311,4401,440$1,507$1.05Enstar NGC149111 Oct-09 10/12/09 11/09/09282,3972,397$2,473$1.03Enstar NGC149111 Nov-09 11/09/09 12/08/09294,4044,404$4,484$1.02Enstar NGC149111 Dec-09 12/08/09 01/11/10344,9784,978$4,421$0.890Enstar NGC149111 Jan-10 01/11/10 02/10/10305,0125,012$4,210$0.84Enstar NGC149111 Feb-10 02/10/10 03/10/10283,5473,547$2,997$0.84Enstar NGC149111 Mar-10 03/10/10 04/12/10333,1683,168$2,703$0.85Enstar NGC149111 Apr-10 04/12/10 05/10/10282,3182,318$2,003$0.86Enstar NGC149111 May-10 05/10/10 06/08/10291,3451,345$1,196$0.89Enstar NGC149111Jun-1006/08/1007/09/1031851851$778$0.91Enstar NGC149111Jun-1006/08/1007/09/1031851851$778$0.91Enstar NGC149111 Jul-10 07/09/10 08/10/1032820820$932$1.14Enstar NGC149111 Aug-10 08/10/10 09/09/1030923923$1,104$1.20Enstar NGC149111 Sep-10 09/09/10 10/11/10321,3941,394$1,464$1.05Enstar NGC149111 Oct-10 10/11/10 11/08/10282,4392,439$2,333$0.96Enstar NGC149111 Nov-10 11/08/10 12/08/10304,0494,049$3,607$0.89Enstar NGC149111 Dec-10 12/08/10 01/11/11346,7546,754$5,812$0.86Jan - 09 to Dec - 09 total:32,63732,6370.00$32,857$0Jan - 10 to Dec - 10 total:32,62032,6200.00$29,139$0$1.01$0.89Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg: $3,000 $4,000 $5,000 $6,000 $7,000 3,0004,0005,0006,0007,0008,000Natural Gas Cost ($)Natural Gas Consumption (Therms)Airport Heights Elementary - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $1,000 $2,000 01,0002,000Jan-09 Mar-09 May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10Natural Gas Consumption (Therms)Date (Mon - Yr) Airport Heights ElementaryElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)ML&P 21477688 Jan-09 1/12/2009 2/13/20093250,4331,721125$4,403$0.090ML&P 21477688 Feb-09 2/13/2009 3/13/20092842,1591,439125$6,288$0.150ML&P 21477688 Mar-09 3/13/2009 4/14/20093242,1191,438112$6,371$0.150ML&P 21477688 Apr-09 4/14/2009 5/14/20093038,0181,298111$4,068$0.110ML&P 21477688 May-09 5/14/2009 6/12/20092932,3411,104103$3,695$0.110ML&P 21477688 Jun-09 6/12/2009 7/15/20093322,54276999$2,868$0.130ML&P 21477688 Jul-09 7/15/2009 8/14/20093022,85078088$2,950$0.130ML&P 21477688 Aug-09 8/14/2009 9/15/20093230,6661,047102$3,564$0.120ML&P 21477688 Sep-09 9/15/2009 10/14/20092936,4021,242110$4,054$0.110ML&P 21477688 Oct-09 10/14/2009 11/16/20093341,8051,427113$4,549$0.110ML&P 21477688 Nov-09 11/16/2009 12/14/20092843,5451,486121$4,728$0.110ML&P 21477688 Dec-09 12/14/2009 1/12/20102945,8001,563125$4,903$0.110ML&P 21477688 Jan-10 1/12/2010 2/11/20103047,7311,629125$4,796$0.100ML&P 21477688 Feb-10 2/11/2010 3/15/20103241,2591,408124$4,074$0.100ML&P 21477688 Mar-10 3/15/2010 4/14/20103043,5491,486115$4,752$0.110ML&P 21477688 Apr-10 4/14/2010 5/13/20102941,4451,415115$4,925$0.120ML&P 21477688 May-10 5/13/2010 6/14/20103231,2621,067107$4,060$0.130ML&P21477688Jun-106/14/20107/13/20102921,268726106$3,054$0.140ML&P21477688Jun-106/14/20107/13/20102921,268726106$3,054$0.140ML&P 21477688 Jul-10 7/13/2010 8/13/20103122,77577786$3,065$0.130ML&P 21477688 Aug-10 8/13/2010 9/14/20103232,5971,113102$3,761$0.120ML&P 21477688 Sep-10 9/14/2010 10/13/20102938,4051,311111$4,343$0.110ML&P 21477688 Oct-10 10/13/2010 11/12/20103043,1821,474116$4,938$0.110ML&P 21477688 Nov-10 11/12/2010 12/13/20103144,5361,520121$5,009$0.110ML&P 21477688 Dec-10 12/13/2010 1/12/20113049,7361,697124$5,739$0.120Jan - 09 to Dec - 09 total:448,68015,3131334.00$52,4410Jan - 10 to Dec - 10 total:457,74515,6231352.00$52,5160$0.12$0.11Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg: $3,000$4,000$5,000$6,000$7,00030,00040,00050,00060,000Electric Cost ($)Electric Consumption (kWh)Airport Heights Elementary - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$1,000$2,000010,00020,000Jan-09 Mar-09 May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10Date (Mon - Yr) Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix B AkWarm Commercial Reports Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 6/15/2012 1:40 PM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Airport Heights ES Auditor Company: Coffman Engineers, Inc. Address: 1510 Alder Dr Auditor Name: Walter Heins, PE, CCP, CxA, CEA City: Anchorage 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: (907) 276(5042 Client Phone: (907) 742(5213 Auditor Comment: Client FAX: Design Data Building Area: 40,835 square feet Design Heating Load: Design Loss at Space: 1,110,851 Btu/hour with Distribution Losses: 1,166,881 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 1,778,781 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 351 people Design Indoor Temperature: 68.3 deg F (building average) Actual City: Anchorage Design Outdoor Temperature: (18 deg F Weather/Fuel City: Anchorage Heating Degree Days: 10,816 deg F(days Utility Information Electric Utility: Anchorage ML&P ( Commercial ( Sm Natural Gas Provider: Enstar Natural Gas ( Commercial ( Sm Average Annual Cost/kWh: $0.120/kWh Average Annual Cost/ccf: $0.950/ccf Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Vent Fans Service Fees Total Cost Existing Building $27,317 $0 $2,611 $18,265 $0 $29,210 $0 $0 $6,889 $0 With Proposed Retrofits $15,656 $0 $2,611 $9,830 $0 $29,210 $0 $0 $6,889 $0 SAVINGS $11,661 $0 $0 $8,434 $0 $0 $0 $0 $0 $0 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School $0$20,000$40,000$60,000$80,000$100,000Existing RetrofitNatural GasElectricityAnnual Energy Costs by Fuel Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School Annual Modeled Consumption (Blue) compared to Actual Electric (Left) and Natural Gas (Right) Consumption (Orange). Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School Monthly Modeled Consumption (Blue) compared to Actual Electric Consumption (Orange). Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Elementary School Monthly Modeled Consumption (Blue) compared to Actual Natural Gas Consumption (Orange). Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Portable Buildings ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 6/14/2012 2:44 pM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Airport Heights ES ( Portable Building Auditor Company: Coffman Engineers, Inc. Address: 1510 Alder Drive Auditor Name: Walter Heins, PE, CCP, CxA, CEA City: Anchorage Auditor Address: 800 F Street Anchorage, AK 99501 Client Name: Calvin Mundt Client Address: Auditor Phone: (907) 276(6664 Auditor FAX: (907) 276(5042 Client Phone: (907) 742(5213 Auditor Comment: Client FAX: Design Data Building Area: 960 square feet Design Heating Load: Design Loss at Space: 18,206 Btu/hour with Distribution Losses: 18,206 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 27,753 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 25 people Design Indoor Temperature: 68 deg F (building average) Actual City: Anchorage Design Outdoor Temperature: (18 deg F Weather/Fuel City: Anchorage Heating Degree Days: 10,816 deg F(days Utility Information Electric Utility: Anchorage ML&P – Commerical – Sm Natural Gas Provider: Enstar Natural Gas ( Commercial ( Sm Average Annual Cost/kWh: $0.120/kWh Average Annual Cost/ccf: $0.000/ccf Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Portable Buildings Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Vent Fans Service Fees Total Cost Existing Building $2,804 $0 $0 $689 $0 $286 $0 $0 $0 $0 With Proposed Retrofits $839 $0 $0 $371 $0 $286 $0 $0 $0 $0 SAVINGS $1,965 $0 $0 $318 $0 $0 $0 $0 $0 $0 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Portable Buildings Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Portable Buildings $0$1,000$2,000$3,000$4,000Existing RetrofitElectricityAnnual Energy Costs by Fuel Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Portable Buildings Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix C Major Equipment List Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B(1 BOILER RM BUILDING HEATING WEIL(MCLAIN 988 GAS(FIRED CAST IRON 2713 MBH ≈ 80% ( 30 10 B(2 BOILER RM BUILDING HEATING WEIL(MCLAIN 988 GAS(FIRED CAST IRON 2713 MBH ≈ 80% ( 30 10 CP(1A BOILER RM HEATING WATER CIRC BELL & GOSSETT 1510 BF BASE(MOUNTED 275GPM 65' 91.7% 7.5 20 12 CP(1B BOILER RM HEATING WATER CIRC BELL & GOSSETT 1510 BF BASE(MOUNTED 275GPM 65' 91.7% 7.5 20 12 CP(2A BOILER RM HEATING GLYCOL CIRC BELL & GOSSETT 1510 BF BASE(MOUNTED 252GPM 65' 91% 7.5 20 12 CP(2B BOILER RM HEATING GLYCOL CIRC BELL & GOSSETT 1510 BF BASE(MOUNTED 252GPM 65' 91% 7.5 20 12 CP(3A BOILER RM BOILER CIRC BELL & GOSSETT 805C BF INLINE 195 GPM 31’ 89.5% 3 10 2 CP(3B BOILER RM BOILER CIRC BELL & GOSSETT 805C BF INLINE 195 GPM 31’ 89.5% 3 10 2 DHW PUMP BOILER RM DOMESTIC HOT WATER CIRC GRUNDFOS UPS15(55SFC INLINE ( ≈ 86% 87 W 10 2 UNIT VENTILATOR 1(20 CLASS ROOMS CLASSROOM SUPPLY TRANE H(2 CABINET VENTILATOR CENTRIFUGAL 1000CFM ≈ 80% 230 W 25 0 AHU(2 (1991) BOILER RM BOILER RM SUPPLY TRANE CLIMATE CHANGER CENTRIFUGAL 2550CFM 0.75" ≈ 77% 1 25 4 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) AHU(11 (2004) LIBRARY OFFICE/LIBRARY SUPPLY HAAKON AIRPAK AHU(11 CENTRIFUGAL 5330CFM 1.5" 89.5% 5 25 17 AHU(21 (2004) FAN RM MPR/KITCHEN SUPPLY TRANE CLIMATE CHANGER 21 CENTRIFUGAL 10050CFM 1.5" 89.5% 10 25 17 EF(11 ROOF OFFICE/LIBRARY EXHAUST GREEN HECK RBE(3L24(10 PROPELLER 5330CFM 0.5" ≈ 80% 1 15 7 EF(12 ROOF OFFICE RESTROOM EXHAUST GREEN HECK G(100(AX(QD CENTRIFUGAL 974CFM ≈ 80% 1/4 25 0 EF(21 FAN RM MPR EXHAUST TRANE Q(24 AXIAL 10050CFM 0.53” 88.5% 7.5 20 12 EF(22 ROOF KITCHEN HOOD GREEN HECK CUBE 140(3 CENTRIFUGAL 1750CFM 0.38” ≈ 80% 1/3 25 12 EF(23 KITCHEN RESTRM RESTROOM EXHAUST GREEN HECK SP(6 CENTRIFUGAL 50CFM 0.25” ≈ 80% 40 W 25 12 EF(24 a ROOF RESTROOM EXHAUST GREEN HECK GB(24(7X(QD CENTRIFUGAL ( ≈ 80% 3/4 25 0 EF(25 a ROOF RESTROOM EXHAUST GREEN HECK GB(24(7X(QD CENTRIFUGAL ( ≈ 80% 3/4 25 0 EF(26 a ROOF EXHAUST PENN AB(35 CENTRIFUGAL 900 CFM ( 1/6 25 0 EF(27 a ROOF EXHAUST PENN AB(35 CENTRIFUGAL 900 CFM ( 1/6 25 0 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) WH(1 BOILER RM DOMESTIC HOT WATER RHEAM R156(40 GAS(FIRED 38 GAL ≈ 65% ( 15 0 AC(1 BOILER RM PNEUMATIC SUPPLY INGERSOL RAND T30 ( ( 85.5% 5 20 0 Notes: a This equipment was given a sequential tag number for the purposes of this report. The actual tag number could not be located on equipment or in mechanical drawings. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix D Energy Conservation Measures Airport Heights Elementary School Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 The following tables consist of raw output data from the AkWarm Commercial program used to model energy costs and calculate energy savings and financial ratios. These tables represent all of the energy conservation measures calculated and considered by the energy audit team. However, ECMs included in the Executive Summary and Section VIII are recommended by the energy audit team due to their viable financial ratios (SIR>1) or due to their value added. PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 1 Lighting ( Controls Retrofit: Corridor Add new Occupancy Sensor and Improve Manual Switching $1,543 $800 28.18 0.5 2a Lighting ( Power Retrofit: Corridor Replace with FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic $79 $150 7.74 1.9 3 Setback Thermostat: Multipurpose Room Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Multipurpose Room space. $179 $350 6.61 2 4 Setback Thermostat: Offices Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Offices space. $183 $450 5.24 2.5 5 a Lighting ( Combined Retrofit: Corridor Replace with 8 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor and Improve Manual Switching $395 $1,400 4.12 3.5 6 Lighting ( Controls Retrofit: Office Add new Occupancy Sensor $80 $300 3.91 3.7 7 a Lighting ( Power Retrofit: Corridor Replace with 6 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $238 $900 3.87 3.8 8 Lighting ( Controls Retrofit: Classrooms Add new Occupancy Sensor $774 $3,000 3.58 3.9 9 Lighting ( Controls Retrofit: Corridor Add new Occupancy Sensor $180 $800 3.29 4.4 10 Lighting ( Controls Retrofit: Library Add new Occupancy Sensor $226 $1,200 2.75 5.3 11 Cathedral Ceiling: Old AHU Penetration Install R(10 rigid board insulation. No cost included for covering insulation. $20 $200 2.36 9.9 12 Below( (part or all) Grade Wall: Utilidor Install R(10 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $1,420 $15,008 2.20 10.6 13 Lighting ( Controls Retrofit: Restroom Student Add new Occupancy Sensor $96 $800 1.75 8.3 14 a Lighting ( Combined Retrofit: MPR Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard StdElectronic and Add new Occupancy Sensor $1,388 $12,000 1.69 8.6 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 15 Lighting ( Power Retrofit: Exterior Lighting Replace with 8 LED 72W Module StdElectronic $524 $4,800 1.59 9.2 16 Lighting ( Power Retrofit: Exterior Lighting Replace with 2 LED 72W Module StdElectronic $131 $1,200 1.59 9.2 17 Lighting ( Controls Retrofit: Data Room Add new Occupancy Sensor $14 $150 1.40 10.4 18 a Lighting ( Combined Retrofit: Camp Fire Replace with 8 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic and Add new Occupancy Sensor $200 $2,200 1.33 11 19 Lighting ( Power Retrofit: Exterior Lighting Replace with 6 LED 50W Module StdElectronic $272 $3,000 1.32 11 20 Air Tightening Perform air sealing to reduce air leakage by 20%. $1,270 $9,000 1.25 7.1 21 Setback Thermostat: Classrooms Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Classrooms space. $3,594 $40,000 1.16 11.1 22 Lighting ( Controls Retrofit: Staff Room Add new Occupancy Sensor $11 $150 1.08 13.6 23 Lighting ( Controls Retrofit: Corridor Add new Occupancy Sensor $43 $600 1.05 13.9 24 a Lighting ( Combined Retrofit: Corridor Replace with 8 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $92 $1,400 0.96 15.2 25 a Lighting ( Combined Retrofit: Storage Replace with 2 FLUOR CFL, Spiral 23 W and Add new Occupancy Sensor $9 $180 0.75 19.5 26 Lighting ( Controls Retrofit: Office Add new Occupancy Sensor $38 $750 0.73 19.9 27 HVAC And DHW Replace lead boiler with a high efficiency condensing boiler. $3,372 $125,000 0.63 37.1 28 Lighting ( Power Retrofit: Exterior Lighting Replace with 20 LED 150W Module StdElectronic $1,694 $40,000 0.62 23.6 29 Exterior Door: Metal w/half lite Remove existing door and install standard pre(hung U( 0.16 insulated door, including hardware. $189 $8,608 0.51 45.5 30 Exterior Door: Solid Exterior Doors Remove existing door and install standard pre(hung U( 0.16 insulated door, including hardware. $76 $4,099 0.43 53.9 31 Lighting ( Controls Retrofit: Storage Add new Occupancy Sensor $13 $450 0.42 34.6 32 a Lighting ( Power Retrofit: Utility Room Replace with 8 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $33 $1,200 0.40 36.7 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 33 Window/Skylight: South Face Entryway Glass Replace existing window with U(0.30 vinyl window $58 $2,526 0.38 43.8 34 a Lighting ( Combined Retrofit: Class Toilet Replace with 9 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $51 $2,100 0.36 40.8 35 a Lighting ( Combined Retrofit: Restroom Staff Replace with 2 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $16 $700 0.32 45 36 a Lighting ( Combined Retrofit: Kitchen Replace with FLUOR CFL, Spiral 23 W and Controls retrofit $4 $180 0.32 44.9 37 Lighting ( Controls Retrofit: Camp Fire Add new Occupancy Sensor $3 $150 0.27 54.4 38 Window/Skylight: North Face Entryway Glass Replace existing window with U(0.30 vinyl window $26 $1,764 0.24 68.7 39 Window/Skylight: East Face Existing Windows Replace existing window with U(0.30 vinyl window $427 $29,588 0.24 69.3 40 Window/Skylight: West Face Windows Replace existing window with U(0.30 vinyl window $500 $65,959 0.13 131.9 41 Window/Skylight: East Face Windows Replace existing window with U(0.30 vinyl window $619 $82,394 0.13 133.1 42 Window/Skylight: South Face Windows Replace existing window with U(0.30 vinyl window $15 $2,159 0.11 144.7 TOTAL $20,096 $467,665 0.7 23.3 a This item is intended to be implemented once the existing instant start ballasts fail and require replacement, negating the cost of installing new ballasts. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS 1. Building Envelope Insulation Rank Location Existing Type/R7Value Recommendation Type/R7 Value Installed Cost Annual Energy Savings 11 Cathedral Ceiling: Old AHU Penetration Framing Type: I(Beam (TJI) Framing Spacing: 24 inches Insulated Sheathing: None Bottom Insulation Layer: None Top Insulation Layer: None Modeled R(Value: 2.6 Install R(10 rigid board insulation. No cost included for covering insulation. $200 $20 12 Below( (part or all) Grade Wall: Utilidor Wall Type: Masonry Insul. Sheathing: EPS Type I ( psi 10, 0.78 inches Masonry Wall: 8" Poured Concrete Modeled R(Value: 5.8 Install R(10 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $15,008 $1,420 Exterior Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 29 Exterior Door: Metal w/half lite Door Type: Entrance, Metal, fiberglass core, half lite Modeled R(Value: 2.2 Remove existing door and install standard pre(hung U( 0.16 insulated door, including hardware. $8,608 $189 30 Exterior Door: Solid Exterior Doors Door Type: Entrance, Metal, polyurethane core, metal edge Modeled R(Value: 2.5 Remove existing door and install standard pre(hung U( 0.16 insulated door, including hardware. $4,099 $76 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 33 Window/Skylight: South Face Entryway Glass Glass: Double, glass Frame: Aluminum, No Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.81 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $2,526 $58 38 Window/Skylight: North Face Entryway Glass Glass: Double, glass Frame: Aluminum, No Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.81 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $1,764 $26 39 Window/Skylight: East Face Existing Windows Glass: Double, glass Frame: Aluminum, No Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.81 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $29,588 $427 40 Window/Skylight: West Face Windows Glass: Double, glass Frame: Reinforced Vinyl/Alum(Clad Wood Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.55 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $65,959 $500 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 41 Window/Skylight: East Face Windows Glass: Double, glass Frame: Reinforced Vinyl/Alum(Clad Wood Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.55 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $82,394 $619 42 Window/Skylight: South Face Windows Glass: Double, glass Frame: Reinforced Vinyl/Alum(Clad Wood Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.55 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $2,159 $15 Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 22 Air Tightness estimated as: 0.85 cfm/ft2 of above(grade shell area at 75 Pascals Perform air sealing to reduce air leakage by 20%. $9,000 $1,270 2. Mechanical Equipment Mechanical Rank Recommendation Installed Cost Annual Energy Savings 27 Replace lead boiler with a high efficiency condensing boiler. $125,000 $3,372 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Setback Thermostat Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 3 Multipurpose Room Existing Unoccupied Heating Setpoint: 65.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Multipurpose Room space. $350 $179 4 Offices Existing Unoccupied Heating Setpoint: 65.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Offices space. $450 $183 21 Classrooms Existing Unoccupied Heating Setpoint: 68.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Classrooms space. $40,000 $3,594 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 1 Corridor 33 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor and Improve Manual Switching $800 $1,543 2 Corridor FLUOR (4) T12 4' F40T12 40W Standard (2) Magnetic with Manual Switching Replace with FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic $150 $79 5 Corridor 8 FLUOR T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 8 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor and Improve Manual Switching $1,400 $395 6 Office 11 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $300 $80 7 Corridor 6 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 6 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $900 $238 8 Classrooms 240 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Multi(Level Switch Add new Occupancy Sensor $3,000 $774 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 9 Corridor 33 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $800 $180 10 Library 31 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $1,200 $226 12 Restroom Student 20 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $800 $96 13 MPR 16 MH 400 Watt Magnetic with Manual Switching Replace with 16 FLUOR (4) T5 45.2" F54W/T5 HO Standard StdElectronic and Add new Occupancy Sensor $12,000 $1,388 14 Exterior Lighting 8 HPS 150 Watt Magnetic with Manual Switching Replace with 8 LED 72W Module StdElectronic $4,800 $524 15 Exterior Lighting 2 HPS 150 Watt Magnetic with Manual Switching Replace with 2 LED 72W Module StdElectronic $1,200 $131 16 Data Room FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $14 17 Camp Fire 8 FLUOR (2) T12 8' F96T12/HO 110W Standard Magnetic with Manual Switching Replace with 8 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic and Add new Occupancy Sensor $2,200 $200 18 Exterior Lighting 6 HPS 100 Watt Magnetic with Manual Switching Replace with 6 LED 50W Module StdElectronic $3,000 $272 20 Staff Room 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $11 21 Corridor 9 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $600 $43 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 23 Corridor 8 FLUOR T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 8 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,400 $92 24 Storage 2 INCAN A Lamp, Std 60W with Manual Switching Replace with 2 FLUOR CFL, Spiral 23 W and Add new Occupancy Sensor $180 $9 25 Office 11 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $750 $38 27 Exterior Lighting 20 HPS 400 Watt Magnetic with Manual Switching Replace with 20 LED 150W Module StdElectronic $40,000 $1,694 30 Storage 8 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $450 $13 31 Utility Room 8 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 8 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $1,200 $33 32 Class Toilet 9 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 9 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $2,100 $51 33 Restroom Staff 2 FLUOR (2) T12 4' F40T12 34W Energy(Saver Magnetic with Manual Switching Replace with 2 FLUOR T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $700 $16 34 Kitchen INCAN A Lamp, Std 60W with Manual Switching Replace with FLUOR CFL, Spiral 23 W and Controls retrofit $180 $4 35 Camp Fire FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $3 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix E Energy Conservation Measures Airport Heights Portable Buildings Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 The following tables consist of raw output data from the AkWarm Commercial program used to model energy costs and calculate energy savings and financial ratios. These tables represent all of the energy conservation measures calculated and considered by the energy audit team. However, ECMs included in the Executive Summary and Section VIII are recommended by the energy audit team due to their viable financial ratios (SIR>1) or due to their value added. PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 1 Below( (part or all) Grade Wall: Portable Building Skirting Install R(15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $925 $1,650 10.78 1.8 2 Ceiling w/ Attic: Portable Building ( Cold Roof Add R(33 blown cellulose insulation to attic with Standard Truss. $220 $1,987 2.12 9 3 Setback Thermostat: Portable Building Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Portable Building space. $298 $2,000 1.75 6.7 4 Lighting ( Combined Retrofit: Relocatable Lighting Replace with 11 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $167 $1,750 1.39 10.5 5 Lighting ( Combined Retrofit: Relocatable Lighting Replace with 8 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic and Add new Occupancy Sensor $125 $1,400 1.30 11.2 6 Exterior Door: Portable Building ( Doors Remove existing door and install standard pre(hung U( 0.16 insulated door, including hardware. $50 $820 1.17 16.4 7 Air Tightening Perform air sealing to reduce air leakage by 30%. $102 $850 1.01 8.3 8 Lighting ( Power Retrofit: Relocatable Lighting Replace with LED 35W Module StdElectronic $27 $400 0.98 14.9 9 Above(Grade Wall: Portable Building ( 2x4 Stud Wall Install R(15 rigid foam board to exterior and cover with T1( 11 siding or equivalent. $352 $9,710 0.70 27.6 10 Window/Skylight: Portable Building ( Double Pane Windows Replace existing window with U(0.30 vinyl window $19 $831 0.33 44.4 TOTAL $2,284 $21,398 1.82 9.4 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS 2. Building Envelope Insulation Rank Location Existing Type/R7Value Recommendation Type/R7 Value Installed Cost Annual Energy Savings 1 Below( (part or all) Grade Wall: Portable Building Skirting Wall Type: All Weather Wood Insul. Sheathing: None Framed Wall: 2 x 4, 16" on center None Modeled R(Value: 3 Install R(15 rigid foam board to interior or exterior side of wall. Does not include cost of coverings. $1,650 $925 2 Ceiling w/ Attic: Portable Building ( Cold Roof Framing Type: Standard Framing Spacing: 24 inches Insulated Sheathing: None Bottom Insulation Layer: R(19 Batt:FG or RW, 6 inches Top Insulation Layer: None Modeled R(Value: 21.1 Add R(33 blown cellulose insulation to attic with Standard Truss. $1,987 $220 9 Above(Grade Wall: Portable Building ( 2x4 Stud Wall Wall Type: Single Stud Siding Configuration: Just Siding Insul. Sheathing: None Structural Wall: 2 x 4, 16 inches on center R(11 Batt:FG or RW, 3.5 inches Window and door headers: Not Insulated Modeled R(Value: 10.6 Install R(15 rigid foam board to exterior and cover with T1(11 siding or equivalent. $9,710 $352 Exterior Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 6 Exterior Door: Portable Building ( Doors Door Type: Entrance, Metal, polyurethane core, metal edge Modeled R(Value: 2.5 Remove existing door and install standard pre(hung U( 0.16 insulated door, including hardware. $820 $50 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 10 Window/Skylight: Portable Building ( Double Pane Windows Glass: Double, glass Frame: Reinforced Vinyl/Alum(Clad Wood Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U(Value: 0.55 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U(0.30 vinyl window $831 $19 Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 7 Air Tightness estimated as: 818 cfm at 50 Pascals Perform air sealing to reduce air leakage by 30%. $850 $102 2. Mechanical Equipment Setback Thermostat Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 3 Portable Building Existing Unoccupied Heating Setpoint: 68.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Portable Building space. $2,000 $298 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 4 Relocatable Lighting 11 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 11 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,750 $167 5 Relocatable Lighting 8 FLUOR (4) T12 4' F40T12 40W Standard (2) StdElectronic with Manual Switching Replace with 8 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic and Add new Occupancy Sensor $1,400 $125 8 Relocatable Lighting HPS 70 Watt Magnetic with Manual Switching Replace with LED 35W Module StdElectronic $400 $27 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix F Site Survey Photos Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 1. School, Main Entrance 2. School, North Face 3. School, East Face 4. School, South Face 5. Portable Building 6. School, West Face Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 7. Boilers B(1 & B(2 in Boiler Room 8. Pumps CP(1A, CP(1B, CP(2A & CP(2B in Boiler Room 9. Domestic Water Heater in Boiler Room 10. Exhaust Fan, EF(21, in Fan Room Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 11. Air Handler, AHU(21, in Fan Room 12. Air Handler, AHU(11, in Library 13. Un(insulated Roof Area over Office Corridor from the Rooftop 14. Un(insulated Roof Area over Office Corridor at location of decommissioned and removed AHU(11 Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 15. East Entryway Doors 16. Typical Classroom Unit Ventilator Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Appendix G Thermographic Photos Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 Coffman Engineers made miscellaneous thermographic images of Airport Heights 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, Main Entrance. Thermal Image is shown below. 2. Thermographic Image, Main Entrance. Temperatures indicated by color scale on right. Yellow indicates heat leakage. The outside temperature was about 28°F. Significant heat loss is observed from the metal door frames. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 3. Optical Image, North Boiler Room Wall. Thermal Image is shown to the right. 4. Thermographic Image, North Boiler Room Wall. Heat loss is observed through the poorly insulated wall. Heat loss around doors can indicate a need for better weather stripping. 5. Optical Image, West Face. Thermal Image is shown to the right. 6. Thermographic Image, West Face. Heat loss is occurring through the foundation wall. 7. Optical Image, West Classroom Exit Doors. Thermal Image is shown to the right. 8. Thermographic Image, West Classroom Exit Doors. Heat loss around doors can indicate a need for better weather stripping. Airport Heights Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/15/2012 AkWarm No. CIRI(ANC(CAEC(11 9. Optical Image, North Entry Doors and Perimeter Windows. Thermal Image is shown to the right. 10. Thermographic Image, North Entry Doors and Perimeter Windows. Heat loss is occurring through metal window frames and around door seals. 11. Optical Image, Portable Building North Face. Thermal Image is shown to the right. 12. Thermographic Image, Portable Building North Face. Heat loss around doors and windows can indicate a need for improved weather stripping 13. Optical Image, South MPR Exit Door. Thermal Image is shown to the right. 14. Thermographic Image, South MPR Exit Door. Heat loss is observed from the door seals. End of Report