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Home My WebLink AboutCIRI-ANC-CAEC ASD Operations Building 2012-EE 800 F Street Anchorage, AK 99501 p (907) 276-6664 f (907) 276-5042 Contact: Walter K. Heins, P.E., CCP, CxA, CEA 32215 Lakefront Dr. Soldotna, Alaska 99669 p (907) 260-5311 Contact: Jerry P. Herring, P.E., CEA ENERGY AUDIT FINAL REPORT Anchorage School District Operations Building 1201 Labar Street Anchorage, AK 99515 (907) 348-5132 AkWarm No. CIRI-ANC-CAEC-04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 i AkWarm No. CIRI-ANC-CAEC-04 Contents I. Executive Summary .................................................................................................................. 1 II. Introduction .............................................................................................................................. 4 III. Energy Audit Process ............................................................................................................. 5 IV. Method of Analysis ................................................................................................................. 6 V. Building Description ................................................................................................................ 7 V.I OPERATIONS BUILDING ........................................................................................................................................ 7 V.II PORTABLE BUILDINGS ........................................................................................................................................ 8 VI. Historic Energy Consumption and Cost............................................................................... 9 VI.I ELECTRICAL CONSUMPTION DATA ..................................................................................................................... 9 VI.II NATURAL GAS CONSUMPTION DATA ................................................................................................................ 9 VI.III OVERALL ENERGY CONSUMPTION DATA ......................................................................................................... 9 VII. Equipment Inventory and Photo Survey .......................................................................... 11 VIII. Energy Conservation Measures ....................................................................................... 12 VIII.I OPERATIONS BUILDING .................................................................................................................................. 12 VIII.II PORTABLE BUILDING ENERGY CONSERVATION MEASURES ......................................................................... 14 VIII.III ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ....................................... 16 Appendices Appendix A – Energy Benchmark Data Appendix B – AkWarm Commercial Reports Appendix C – Major Equipment List Appendix D – Energy Conservation Measures ASD Operations Building Appendix E – Energy Conservation Measures ASD Operations Portable Buildings Appendix F – Site Visit Photos Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 ii AkWarm No. CIRI-ANC-CAEC-04 Abbreviations AHFC Alaska Housing & Finance Corporation ARRA American Recovery & Reinvestment Act ASD Anchorage School District ASHRAE American Society of Heating, Refrigeration, and Air-Conditioning Engineers BTU British Thermal Unit CCF One Hundred Cubic Feet CFM Cubic Feet per Minute DDC Direct Digital Control ECI Energy Cost Index ECM Energy Conservation Measure EPDM Ethylene Propylene Diene Monomer EUI Energy Utilization Index F Fahrenheit HP horsepower HPS High Pressure Sodium HVAC Heating, Ventilating, and Air-Conditioning in inch(es) IPLC Integrated Power & Load Circuit kWh kilowatt-hour LED Light-Emitting Diode O&M Operations & Maintenance sf square feet SIR Savings-to-Investment Ratio V Volts W Watts Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 iii AkWarm No. CIRI-ANC-CAEC-04 List of Figures Fig. 1 – Energy Audit Clients ....................................................................................................................... 1 Fig. 2 – Energy Benchmark Data .................................................................................................................. 1 Fig. 3 – Anchorage, Alaska – Google Maps ................................................................................................. 4 Fig. 4 – Operations Building – Google Maps ............................................................................................... 4 List of Tables Table 1 – Recommended Energy Conservation Measures, Operations Building ......................................... 2 Table 2 – Recommended Energy Conservation Measures, Portable Buildings ............................................ 3 Table 3 – Energy Cost and Consumption Data ............................................................................................. 9 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 iv AkWarm No. CIRI-ANC-CAEC-04 REPORT DISCLAIMER Privacy The information contained within this report, including any attachment(s), was produced under contract to Alaska Housing Finance Corporation (AHFC). IGAs are the property of the State of Alaska, and may be incorporated into AkWarm-C, the Alaska Retrofit Information System (ARIS), or other state and/or public information systems. AkWarm-C is a building energy modeling software developed under contract by AHFC. 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. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 1 AkWarm No. CIRI-ANC-CAEC-04 I. Executive Summary This report presents the findings of an energy audit conducted at the Anchorage School District (ASD) Operations Building 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 annual documented utility costs at this facility from January 2009 to December 2010 are as follows: Electricity $19,115 Natural Gas $ 2,705 Total $21,820 January 2009-December 2010 Energy Utilization Index (EUI) = 90.4 kBtu/sf January 2009-December 2010 Energy Cost Index = 2.75 $/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. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 2 AkWarm No. CIRI-ANC-CAEC-04 Table 1 – Recommended Energy Conservation Measures, Operations Building Executive Summary – Recommended Energy Conservation Measures For Operations Building (OB) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (years) OB-0* Refrigerators Replace Refrigerators older than 5 years old - - - <10 years OB-1 Setback Thermostat: Main Building Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Main Building space. $411 $500 10.61 1.2 OB-2 HVAC And DHW Repair Cost for New Condensing High Efficiency Boiler $967 $6,000 7.43 6.2 OB-3 Lighting: Main Building - Kitchen Replace T12 U-lamp fixtures with 2'x4' T8 fixtures and install a new occupancy sensor for control. $191 $550 5.08 2.9 OB-4 Lighting: Vestibule Replace (6) 100W incandescent lamps with CFL's $180 $300 3.70 1.7 OB-5 Lighting: Main Building - Restrooms Replace incandescent lamps with CFL's and retrofit or replace existing light fixtures to use T8 lamps and electronic ballasts. Install new occupancy sensors for control. $122 $950 1.74 7.8 OB-6 Lighting: Main Building - Office Spaces Replace incandescent lamps with CFL's and retrofit or replace existing light fixtures to use T8 lamps and electronic ballasts. Install new occupancy sensors where applicable. $693 $7,050 1.22 10.2 OB-7 Air Tightening Perform air sealing to reduce air leakage by 20% $82 $1,000 0.73 12.2 * Due to advances in refrigerators in the last 5 years, new Energy Star refrigerators are significantly more efficient than previous models. Replacing existing refrigerators, which are older than 5 years, with new energy star models will typically have paybacks of less than 10 years. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 3 AkWarm No. CIRI-ANC-CAEC-04 Table 2 – Recommended Energy Conservation Measures, Portable Buildings Executive Summary – Recommended Energy Conservation Measures For Single Portable Building (PB) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (years) PB-1 Setback Thermostat: Portable Building Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Portable Building space. $1,010 $2,000 5.93 2 PB-2 Exterior Door: Portable Building - Doors Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $109 $820 2.54 7.6 PB-3 Cathedral Ceiling: Portable Building - Hot Roof Add R-19 to existing insulation. $203 $2,520 1.55 12.4 PB-4 Air Tightening Perform air sealing to reduce air leakage by 20%. $79 $650 1.02 8.2 Note: All ECMs in the table above are based on an AkWarm model for one portable building. Three portables exist at the site. Multiply the annual energy savings and installed costs by three to account for all three portables. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 4 AkWarm No. CIRI-ANC-CAEC-04 II. Introduction This energy audit was conducted at the Anchorage School District Operations Building. The building itself is 3,061 square feet (sf), and has 4,759 sf of portable buildings connected to its electrical service for a total area of 7,820 sf. The location of the building 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 – Operations Building – Google Maps Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 5 AkWarm No. CIRI-ANC-CAEC-04 III. Energy Audit Process Prior to visiting the facility, 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 July 19, 2011. 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 Holben of the Anchorage School District Facilities Department. However, Mr. Holben has since left the school district, and Mr. Paul Kapinos of the Anchorage School District Operations Department has been the point of contact1. 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. Paul Kapinos, (907) 242-1187 (mobile), (907) 348-5252 (office) Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 6 AkWarm No. CIRI-ANC-CAEC-04 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 offices and kitchen. 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. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 7 AkWarm No. CIRI-ANC-CAEC-04 V. Building Description The ASD Operations Building is a single story office building with one “bull rail” and three portable buildings connected to the electrical service. The parking lot bull rail allows vehicles and maintenance equipment to plug into a power source. The Operations Building was constructed in 1988 and has offices, meeting rooms, cubicle work areas, a kitchen/break room, two restrooms, and utility spaces. The office building is regularly occupied by 12 people from 7am to 5pm every day from Monday to Friday. The three portables are used for heated storage and are only occupied several hours a day when equipment is taken in or out of the portable. V.I Operations Building The Operation Building has 2x6 wood stud wall construction at 24” on-center, with R-19 fiberglass batt insulation in between the studs and drywall on the interior face. The exterior face of the wall is precast concrete with a gravel pebble finish. Exterior walls are 12 feet high and interior ceiling height is 10 feet. There is approximately 2,680 square feet of wall on the office building. Floor construction for the office building is slab-on-grade with 2” of rigid edge insulation that extends to two feet below grade. There is 3,061 square feet of floor area. Roof construction for the office building is EPDM roofing membrane covering rigid insulation on top of decking. The roof is supported by beams on 24” centers. The roof is a flat roof. According to the original architectural drawings, the rigid insulation of the hot roof is 3.5” thick. There is 3,061 square feet of roofing on the office building. The office building is heated with one natural gas fired boiler and perimeter hydronic baseboards. The natural draft boiler was manufactured in 1983 by Burnham and is model P-207-W. The boiler input is rated at 198,000 Btu/hr and is approximately 76% efficient. The nameplate for the building’s roof top AHU was missing during the site visit. The AHU fan motor is a 3 HP motor manufactured by Vanguard, with a nameplate nominal efficiency of 85%. This AHU, a rooftop unit, has been out of service, unmaintained, and disconnected for some time. Visual inspection of the exterior housing and of the interior ductwork above the ceiling tiles showed that the system requires significant investment of time and material in order to be operational again. A “Note regarding Ventilation Systems” is included in Section VIII.I. Domestic hot water heating for the office building is supplied by a 50 gal standard updraft domestic hot water heater manufactured by Standard. The domestic hot water consumption of the building was estimated at 12 gallons per day, based on typical office usage patterns developed by ASHRAE. The majority of the building areas are lit via 2 foot by 4 foot recessed 34W T-12 fluorescent light fixtures with a mixture of electronic and magnetic ballasts, however there are a few 2 foot by 2 foot T-12 U-tube fluorescent light fixtures with magnetic ballasts. With the exception of the kitchen all of the fixtures are controlled by wall mounted rocker switches. No means of lighting control was observed in the kitchen and it is assumed that these two 2 foot by 2 foot fixtures are used as nightlights. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 8 AkWarm No. CIRI-ANC-CAEC-04 V.II Portable Buildings The three portables have 2x4 wood stud wall construction at 16” on-center with R-11 fiberglass batt insulation in between the studs. The exterior face of the wall is T1-11 siding with drywall on the interior side of the wall. Interior and exterior wall height is nine feet under the roof eaves, and the end-walls vary in height from nine feet at the eaves to 11 feet at the roof peak in the center of the endwall. One portable typically has 1,170 sq ft of exterior wall area. The portables have above grade floors resting on sleepers. Plywood skirting protects the sleepers and floor construction from weather. The floor construction is plywood flooring resting on 2x8 wood joists. It is estimated that the floor has R-19 fiberglass batt insulation. One portable typically has 1,000 sq ft of floor area. The portables are all covered by hot roofs, with shingles covering plywood decking. It is estimated that the roof insulation is R-19 fiberglass batt insulation. One portable typically has 1,000 sq ft of roof area. 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. This makes it easy for the electric baseboards to be left on at higher temperatures than is required. Due to the need to keep these buildings moveable and due to combustion safety issues, the Anchorage School District wishes to keep all portable buildings on electric heat and is not interested in utilizing natural gas heating at this time. The lighting in the three portables is typically 2 tube, 4ft long, T-12 lighting with magnetic ballasts. Typically T-12 lights can be cost effectively retrofitted with new efficient T-8 lighting. However, due to the low operational use of the portables and low run time of the lights (15 hrs/week) improving the T-12 lighting to T-8 lighting is not cost effective. In the future, this lighting retrofit will be cost effective if the portable lighting is utilized more hours during the week. Due to the fact that the three on-site portables have similar building envelope construction and heating equipment, only one AkWarm model was created to model one portable building. The standardized model was created using 1,000 sf per unit. The results and recommended ECMs generated by this single portable AkWarm model should be extrapolated and applied to each of the three portable buildings. On this facility, the total portable unit floor area measured 4,759 sf. The energy and space usage was taken into consideration when modeling the portable units and has been included within this report. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 9 AkWarm No. CIRI-ANC-CAEC-04 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 units of 100 cubic feet (CCF) of natural gas. Natural gas is delivered as needed through a utility service connection. The average heating value of natural gas is 100,000 BTUs per CCF, which is equal to 1 Therm of energy. VI.III Overall Energy Consumption Data The overall cost for energy use is calculated by dividing the total cost by the total usage. Based on the electric and natural gas utility data provided, the average cost for the energy and consumption calculations at the surveyed facility are summarized in the table below. Table 3 – Energy Cost and Consumption Data Energy Cost and Consumption Data 2009 2010 Average Electric 0.13 $/kWh 0.16 $/kWh 0.15 $/kWh Natural Gas 1.06 $/CCF 0.89 $/CCF 0.97 $/CCF Total Cost $19,606 $23,345 $21,476 ECI 2.51 $/sf 2.99 $/sf 2.75 $/sf Electric EUI 57.7 kBtu/sf 56.1 kBtu/sf 56.9 kBtu/sf Natural Gas EUI 31.3 kBtu/sf 35.7 kBtu/sf 33.5 kBtu/sf Building EUI 89.0 kBtu/sf 91.9 kBtu/sf 90.4 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 7,820 square feet. This area includes the 3,061 sf main building in addition to the 4,759 sf of portables attached to the building electrical service. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 10 AkWarm No. CIRI-ANC-CAEC-04 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. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 11 AkWarm No. CIRI-ANC-CAEC-04 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 detailing the equipment and building are included in Appendix E. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 12 AkWarm No. CIRI-ANC-CAEC-04 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 Operations Building ECM #OB-0 – Replace Refrigerators Older than 5 years Old Annual Energy Savings Installed Cost SIR Payback (years) ---<10 years Due to recent advances in refrigerators in the last 5 years, new Energy Star refrigerators are significantly more efficient than previous models. Replacing existing refrigerators, which are older than 5 years old, with new energy star models will typically have paybacks of less than 10 years. ECM #OB-1 – Setback Thermostat Annual Energy Savings Installed Cost SIR Payback (years) $411 $500 10.61 1.2 Significant energy savings exist by reducing the room temperature of the main building during unoccupied times. Reducing the temperature to 60F during unoccupied times will save approximately $5417 annually, with an estimated installed cost of $500. The SIR for the setback thermostat ECM is 10.75 with a 1.2 year simple payback. ECM #OB-2 – New Condensing High-Efficiency Boiler Annual Energy Savings Installed Cost SIR Payback (years) $967 $6,000 7.43 6.2 The existing boiler is approaching the end of its service life and requires regular maintenance in order to continue operation. Replacing the boiler with an appropriately sized condensing high-efficiency boiler will yield significant energy savings, especially during shoulder seasons; however, replacing a functioning boiler is a significant cost hurdle and does not provide economic financial payback. The repair cost is the cost difference between a condensing high-efficiency boiler and a natural-draft cast iron boiler, and heating systems changes that would be required if upgrading to a condensing boiler. This cost can be considered when the existing boiler requires replacement. This cost difference is approximately $6,000, and a condensing boiler would save approximately $967 per year. The SIR is approximately 7.4 and the payback is 6.2 years. A Weil-McLain Ultra-series boiler was used as the basis for this ECM. See item 2 in Appendix D. ECM #OB-3 – Upgrade Kitchen Lighting and Control Annual Energy Savings Installed Cost SIR Payback (years) $191 $550 5.08 2.9 The existing light fixtures in the kitchen are 2 foot by 2 foot, 2 lamp U-tube T-12 fluorescent light fixtures with magnetic ballasts. The existing fixtures do not appear to have a local control switch and are continuously illuminated. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 13 AkWarm No. CIRI-ANC-CAEC-04 By replacing the existing light fixtures with 2 foot by 4 foot, 2 lamp T-8, recessed, fluorescent light fixtures with program start electronic ballasts and occupancy sensor control, approximately $190 will be saved annually, with an initial cost of $550. The savings-to-investment ratio (SIR) is approximately 5.08 and the simple payback is approximately 2.9 years. ECM #OB-4 – Upgrade Vestibule Lighting Annual Energy Savings Installed Cost SIR Payback (years) $180 $300 3.70 1.7 The existing light fixtures in the front entryway and vestibule are recessed down lights with 100W screw base incandescent lamps. By replacing the existing lamps with compact fluorescent lamps or par LED's, approximately $180 will be saved annually, with an initial cost of $300. The savings-to-investment ratio (SIR) is approximately 3.70 and the simple payback is approximately 1.7 years. ECM #OB-5 – Upgrade Restroom Lighting and Control Annual Energy Savings Installed Cost SIR Payback (years) $122 $950 1.74 7.8 The toilet areas in both restrooms are each illuminated by a recessed down light with (1) 100W screw base incandescent light fixture, while the sink areas are each illuminated by a two-lamp T12 vanity light fixture. Wall mounted rocker switched are used to control all of the restroom lighting. By replacing the existing incandescent lamps with compact fluorescent lamps or par LED's, replacing the T12 light fixtures with two-lamp T8 fixtures, and installing four new occupancy sensors, approximately $120 will be saved annually, with an initial cost of $950. The savings-to-investment ratio (SIR) is approximately 1.74 and the simple payback is approximately 7.8 years. ECM #OB-6 – Upgrade Office Lighting and Control Annual Energy Savings Installed Cost SIR Payback (years) $693 $7,050 1.22 10.2 The communal office areas are illuminated by (12) four-lamp 2 foot by 4 foot recessed T12 troffers, (6) two-lamp 4 foot wrap type fluorescent T12 fixtures, and (3) two-lamp 2 foot by 2 foot troffers with T12 U-lamps. The private offices are illuminated by (16) four-lamp, 2 foot by 4 foot, recessed, T12 troffers, and (1) two-lamp, 2 foot by 4 foot, recessed, T12 troffer. Each of the (6) offices is provided with its own wall mounted rocker switch for lighting control. It is recommended that each of the existing troffer light fixtures are retrofitted by replacing the lamps, ballasts and lamp holders to use T8 lamps and electronic program start ballasts. Additional lighting upgrades include replacing the wrap type fixtures one-for-one with T8 wrap fixtures, and installing (6) ceiling mounted occupancy sensors in the private offices. By completing the above recommendation approximately $693 will be saved annually, with an initial cost of $7,050. The savings-to-investment ratio (SIR) is approximately 1.22 and the simple payback is approximately 10.2 years. ECM #OB-7– Seal Building Envelope and Reduce Infiltration by 20% Annual Energy Savings Installed Cost SIR Payback (years) $82 $1,000 0.73 12.2 Reducing infiltration by air sealing the building envelope will produce energy savings. 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 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 14 AkWarm No. CIRI-ANC-CAEC-04 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. Reducing infiltration by 20% with air sealing improvements will save approximately $82 per year and will have an initial cost of approximately $1,000. Even though this measure does not have a positive SIR, it is recommended by the audit team due to the value added to the facility. The savings-to- investment ratio (SIR) is approximately 0.73 with a payback of 12.2 years. Note regarding Ventilation Systems: Further analysis of the Operations Building showed that the air handling unit and ventilation system has been out of service and unmaintained for the duration of the energy consumption metering provided for analysis. Any replacement of the existing AHU and ventilation system will increase energy usage compared to energy consumption data, since the existing system has not been consuming any energy. Since this system requires replacement in order to meet ventilation code requirements, it is possible to estimate how much energy it will consume using calculations based on minimum code requirements. A model of the building was created using calculations that the existing AHU and ventilation system was replaced with an AHU and ventilation system that meets minimum code requirements and is provided with standard efficient motors. This baseline was estimated to cost approximately $139,400 using a renovation calculation from the Alaska Department of Education and Early Development; however the audit team assumed that this cost does not come from ECM funds since the building requires a new AHU and ventilation system in order to meet code requirements. From this modeled baseline, an ECM was calculated based around using a system with premium efficient motors and using demand ventilation control (DVC) to modulate outside air intake based on contaminants such as CO2 in the return air, which is an energy-saving operational profile compared to standard system. A cost opinion representing this energy-saving system was generated using data provided by local DDC and AHU contractors. Such an advanced system would cost approximately $4,600 in addition to the funds required to replace the AHU and ventilation system. Using the $4,600 as a “repair cost,” which is the difference between a standard replacement and a more advanced replacement, the resulting SIR is 0.68, annual energy savings compared to the standard system are approximately $260, and the payback is approximately 17.5 years. It is important to note that due to the small size and low occupancy of the building, savings potential from demand ventilation control is minimal. There are also additional benefits to DVC. In conjunction with a DDC system, it is possible to log the amount of outside air provided to the facility at all times. At larger facilities with higher occupancies, savings potential is much greater and DVC is usually a viable ECM. VIII.II Portable Building Energy Conservation Measures There are three portable buildings that exist on-site. 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 #PB-1 – Setback Thermostat Annual Energy Savings Installed Cost SIR Payback (years) $1,010 $2,000 5.93 2 Significant energy savings exist by reducing the room temperature of the portable buildings during unoccupied times. Reducing the temperature to 60F during unoccupied times will save approximately $1,010 annually per portable building, with an estimated installed cost of $2,000. The SIR for the setback thermostat ECM is 5.93 with a 2 year simple payback. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 15 AkWarm No. CIRI-ANC-CAEC-04 ECM #PB-2 – Replace Exterior Doors Annual Energy Savings Installed Cost SIR Payback (years) $109 $820 2.54 7.6 The portable buildings each have two poorly insulated (R-1.7) metal doors. It is recommended that both doors be removed and replaced with a new R-6.25 minimum (U-0.16) insulated door. This ECM will save approximately $109 per year per portable with a payback of 7.6 years and an SIR of 2.54. Installed cost is for replacing both doors is approximately $820. ECM #PB-3 – Add Roof Insulation Annual Energy Savings Installed Cost SIR Payback (years) $203 $2,520 1.55 12.4 Adding additional R-19 fiberglass batt insulation to the roof of the portables to make an R-38 roof may be feasible during the next scheduled roof replacement. Installing an additional R-19 of insulation will save approximately $203 per year per portable, with an installed cost of $2,520 if completed in combination with the roof replacement. This ECM will give a SIR of 1.55 and a simple payback of 12.4 years. ECM #PB-4– Seal Building Envelope and Reduce Infiltration by 20% Annual Energy Savings Installed Cost SIR Payback (years) $79 $650 1.02 8.2 Reducing infiltration by air sealing the building envelope will produce energy savings. 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 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. Reducing infiltration by 20% with air sealing improvements will save approximately $79 per year per portable and will have an installation cost of approximately $650. The ECM has an SIR of 1.02 with a payback of 8.2 years. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 16 AkWarm No. CIRI-ANC-CAEC-04 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. Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Appendix A Energy Benchmark Data First Name Last Name Middle Name Phone Bob Holben 907-348-5221 State Zip AK 99515-3517 Monday-Friday Saturday Sunday Holidays 08:00-5:00 Average # of Occupants During Renovations Date ASD Operations Other 7,820 Facility Address Building Type Mixed Community Population Facility City Year Built 1988 Building Name/ Identifier Building Usage Building Square Footage Facility Owned By Date 03/14/11Municipal Government/Subdivision REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner MOA Main Office 3068 SF 1201 Labar St Anchorage Primary Operating Hours Contact Person City Anchorage1301 Labar Street Mailing Address Facility Zip 261,500 99517 Email holben_bob@ASDk12.org Details PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton Other energy sources? Describe Relo 1 78x24 = 1872 SF Main Office 3068 SF Relo 2 78x24 = 1872 SF 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. Relo 3 42x24 = 1008 SF Total = 7820 SF Anchorage School District Operations Building Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRIANCCAEC04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 ASD Operations Buiding Size Input (sf) =7,820 2009 Natural Gas Consumption (Therms)2,444.00 2009 Natural Gas Cost ($)2,602 2009 Electric Consumption (kWh)132,302 2009 Electric Cost ($)17,004 2009 Total Energy Use (kBtu)695,947 2009 Total Energy Cost ($)19,606 Annual Energy Use Intensity (EUI) 2009 Natural Gas (kBtu/sf) 31.3 2009 Electricity (kBtu/sf)57.7 2009 Energy Utilization Index (kBtu/sf)89.0 Annual Energy Cost Index (ECI) 2009 Natural Gas Cost Index ($/sf)0.33 2009 Electric Cost Index ($/sf)2.17 2009 Energy Cost Index ($/sf)2.51 2010 Natural Gas Consumption (Therms)2,794.00 2010 Natural Gas Cost ($)2,481 2010 Electric Consumption (kWh)128,602 2010 Electric Cost ($)20,864 2010 Total Energy Use (kBtu)718,319 2010 Total Energy Cost ($)23,345 Annual Energy Use Intensity (EUI) 2010 Natural Gas (kBtu/sf)35.7 2010 Electricity (kBtu/sf)56.1 2010 Energy Utilization Index (kBtu/sf)91.9 Annual Energy Cost Index (ECI) 2010 Natural Gas Cost Index ($/sf)0.32 2010 Electric Cost Index ($/sf)2.67 20010 Energy Cost Index ($/sf)2.99 Note: 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's Anchorage School District Operations Building Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRIANCCAEC04 10 Energy Cost Index ($/sf) Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 ASD OperationsNatural GasBtus/CCF =100,000Provider Meter # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC107137 Jan-09 12/30/08 02/02/09 34455455$481$1.06Enstar NGC107137 Feb-09 02/02/09 02/27/0925351351$375$1.07Enstar NGC107137 Mar-09 02/27/09 04/01/0933325325$347$1.07Enstar NGC107137 Apr-09 04/01/09 04/29/0928176176$194$1.10Enstar NGC107137 May-09 04/29/09 06/01/09334242$55$1.31Enstar NGC107137 Jun-09 06/01/09 06/30/09292626$40$1.54Enstar NGC107137 Jul-09 06/30/09 07/31/09312626$39$1.50Enstar NGC107137 Aug-09 07/31/09 08/31/09313434$47$1.38Enstar NGC107137 Sep-09 08/31/09 09/30/09308181$96$1.19Enstar NGC107137 Oct-09 09/30/09 10/29/0929180180$199$1.11Enstar NGC107137 Nov-09 10/29/09 11/30/0932367367$390$1.06Enstar NGC107137 Dec-09 11/30/09 12/31/0931381381$339$0.89Enstar NGC107137 Jan-10 12/31/09 02/01/1032419419$371$0.89Enstar NGC107137 Feb-10 02/01/10 03/01/1028308308$276$0.90Enstar NGC107137 Mar-10 03/01/10 04/01/1031292292$265$0.91Enstar NGC107137 Apr-10 04/01/10 04/30/1029193193$181$0.94Enstar NGC107137 May-10 04/30/10 05/27/10276666$72$1.09Enstar NGC107137Jun-1005/27/1006/29/10333131$38$1.23Enstar NGC107137Jun-1005/27/1006/29/10333131$38$1.23Enstar NGC107137 Jul-10 06/29/10 07/29/10302929$38$1.31Enstar NGC107137 Aug-10 07/29/10 08/30/10323030$37$1.23Enstar NGC107137 Sep-10 08/30/10 10/01/1032110110$100$0.91Enstar NGC107137 Oct-10 10/01/10 10/28/1027300300$256$0.85Enstar NGC107137 Nov-10 10/28/10 11/29/1032451451$374$0.83Enstar NGC107137 Dec-10 11/29/10 12/29/1030565565$473$0.84Jan - 09 to Dec - 09 total:2,4442,4440$2,602$0Jan - 10 to Dec - 10 total:2,7942,7940$2,481$0$1.06$0.89Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Anchorage School District Operations Building Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRIANCCAEC04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 $200 $300 $400 $500 $600 200300400500600Natural Gas Cost ($)Natural Gas Consumption (Therms)ASD Operations & Maintenance - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $100 $200 0100200Jan-09Mar-09May-09Jul-09Sep-09Nov-09Jan-10Mar-10May-10Jul-10Sep-10Nov-10Natural Gas Consumption (Therms)Date (Mon - Yr)Anchorage School District Operations Building Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRIANCCAEC04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 ElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)CEA 2732-40302400 Jan-09 12/30/2008 1/30/2009311799361436.00 $2,599$0.14$398.20CEA 2732-40302400 Feb-09 1/30/2009 3/3/2009321540152633.00 $2,189$0.14$367.80CEA 2732-40302400 Mar-09 3/3/2009 4/1/2009291552153033.00 $2,037$0.13$242.50CEA 2732-40302400 Apr-09 4/1/2009 4/30/2009291031035224.00 $1,465$0.14$271.20CEA 2732-40302400 May-09 4/30/2009 6/1/200932716324417.00 $1,015$0.14$183.80CEA 2732-40302400 Jun-09 6/1/2009 7/1/200930583019917.00 $749$0.13$156.40CEA 2732-40302400 Jul-09 7/1/2009 7/31/200930496817014.00 $650$0.13$133.60CEA 2732-40302400 Aug-09 7/31/2009 8/31/200931536618321.00 $698$0.13$152.10CEA 2732-40302400 Sep-09 8/31/2009 9/30/200930750825624.00 $948$0.13$247.60CEA 2732-40302400 Oct-09 9/30/2009 10/30/2009301047435732.00 $1,250$0.12$282.70CEA 2732-40302400 Nov-09 10/30/2009 12/1/2009321543352732.00 $1,724$0.11$373.30CEA 2732-40302400 Dec-09 12/1/2009 12/30/2009291633555832.00 $1,680$0.10$373.30CEA 2732-40302400 Jan-10 12/30/2009 1/29/2010301690257731.00 $1,686$0.10$359.20CEA 2732-40302400 Feb-10 1/29/2010 3/2/2010321394247630.00 $1,396$0.10$352.60CEA 2732-40302400 Mar-10 3/2/2010 4/1/2010301442249230.00 $1,546$0.11$337.50CEA 2732-40302400 Apr-10 4/1/2010 5/3/2010321110037929.00 $1,196$0.11$277.10CEA 2732-40302400 May-10 5/3/2010 6/2/201030715724424.00 $857$0.12$218.60CEA 2732-40302400 Jun-10 6/2/2010 7/1/201029451215419.00 $571$0.13$165.80CEA2732-40302400Jul-107/1/20108/2/201032419314320.00$590$0.14$230.50CEA2732-40302400Jul-107/1/20108/2/201032419314320.00$590$0.14$230.50CEA 2732-40302400 Aug-10 316291215613.00$5,085$0.81CEA 2732-40302400 Sep-10 308247281613.00$3,635$0.44CEA 2732-40302400 Oct-10 311022534924.00 $1,082$0.11CEA 2732-40302400 Nov-10 301432248932.00 $1,485$0.10CEA 2732-40302400 Dec-10 311728959035.00 $1,735$0.10Jan - 09 to Dec - 09 total:1323024,515315$17,004$3,183Jan - 10 to Dec - 10 total:1286024,3891500$20,864$1,941$0.13$0.16Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Anchorage School District Operations Building Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRIANCCAEC04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 $3,000$4,000$5,000$6,0008000100001200014000160001800020000Electric Cost ($)Electric Consumption (kWh)ASD Operations & Maintenance - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$1,000$2,0000200040006000Jan-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)Anchorage School District Operations Building Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRIANCCAEC04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Appendix B AkWarm Commercial Reports Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Operations Building ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/28/2012 10:40 AM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Anchorage School District Operations Building Auditor Company: Coffman Engineers, Inc. Address: 1201 Labar Street 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: 3,061 square feet Design Heating Load: Design Loss at Space: 43,725 Btu/hour with Distribution Losses: 46,027 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 70,163 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 12 people Design Indoor Temperature: 70 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: Chugach Electric - Commercial - Sm Natural Gas Provider: Enstar Natural Gas - Commercial - Sm Average Annual Cost/kWh: $0.150/kWh Average Annual Cost/ccf: $0.970/ccf Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Operations Building Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrigeration Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $3,373 $0 $129 $2,445 $450 $11,493 $55 $52 $1,507 $0 $19,504 With Proposed Retrofits $1,649 $0 $108 $1,404 $450 $11,493 $55 $52 $1,291 $0 $16,503 SAVINGS $1,724 $0 $21 $1,041 $0 $0 $0 $0 $215 $0 $3,002 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Operations Building $0$5,000$10,000$15,000$20,000Existing RetrofitVentilation and FansSpace HeatingRefrigerationOther ElectricalLightingDomestic Hot WaterCookingClothes DryingAnnual Energy Costs by End Use Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Operations Building Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Operations Building Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Portable Building ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/9/2012 1:10 PM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Anchorage School District Operations - Portable Building Auditor Company: Coffman Engineers, Inc. Address: 1201 Labar Street 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: 1,000 square feet. The area shown here is the standardized area of a typical portable. There are 3 portables on this site for a total area of 4,759 sf. Design Heating Load: Design Loss at Space: 22,993 Btu/hour with Distribution Losses: 22,993 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 35,051 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 0 people Design Indoor Temperature: 70 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: Chugach Electric - Commercial - Sm Natural Gas Provider: Enstar Natural Gas - Commercial - Sm Average Annual Cost/kWh: $0.150/kWh Average Annual Cost/ccf: $0.000/ccf Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Portable Building Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrigeration Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $3,188 $0 $0 $230 $0 $117 $0 $0 $0 $0 $3,535 With Proposed Retrofits $1,179 $0 $0 $113 $0 $117 $0 $0 $0 $0 $1,410 SAVINGS $2,008 $0 $0 $117 $0 $0 $0 $0 $0 $0 $2,125 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Portable Building $0$1,000$2,000$3,000$4,000Existing RetrofitSpace HeatingOther ElectricalLightingAnnual Energy Costs by End Use Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Portable Building Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Portable Building Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Appendix C Major Equipment List Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 TAG LOCATION FUNCTION MAKE MODELTYPE CAPACITY EFFICIENCYMOTOR SIZEASHRAE SERVICE LIFEESTIMATED REMAINING USEFUL LIFENOTESB‐1BOILER RM BUILDING HEATING BURNHAM P‐207‐WNATURAL DRAFT, GAS FIRED198 MBH≈76% N/A 30 7DHW‐1BOILER RMDOMESTIC HOT WATER HEATERSTANDARD GS650YBRT STANDARD UPDRAFT 50 GAL≈58% N/A 15 8CP‐1BOILER RM HEATING WATER CIRCBELL AND GOSSETT60 SERIES INLINE 25 GPMNEMA STANDARD1 HP 10 9AHU‐1 ROOF BUILDING AHUNO NAME PLATENO NAME PLATECABINET FAN≈500 CFMNEMA STANDARD3 HP 25 2MAJOR EQUIPMENT INVENTORY Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Appendix D Energy Conservation Measures ASD Operations Building Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 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 CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 1 Setback Thermostat: Main Building Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Main Building space. $411 $500 10.61 1.2 2 HVAC And DHW New Weil-McLain Ultra Boiler $967 $6,000 7.43 6.2 3 Lighting: Main Building - Kitchen Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor and Improve Manual Switching $191 $550 5.08 2.9 4 Lighting: Main Building - Vestibule Replace with 6 FLUOR CFL, A Lamp 20W $180 $300 3.70 1.7 5 Lighting: Main Building - Restroom - Oc Sensor Replace with 2 FLUOR CFL, A Lamp 20W and Add new Occupancy Sensor $77 $400 2.51 5.2 6 Lighting: Main Building - Office Space - Oc Sensor Replace with 10 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $261 $2,100 1.82 8 7 Lighting: Main Building - Restroom - Oc Sensor Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic and Add new Occupancy Sensor $45 $550 1.18 12.3 8 Lighting: Main Building - Office Space - Oc Sensor Replace with 6 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $84 $1,050 1.17 12.5 9 Lighting: Main Building - Office Space - No Oc Sensor Replace with 6 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $59 $900 0.97 15.1 10 Lighting: Main Building - Office Space - No Oc Sensor Replace with 7 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $62 $1,050 0.86 17 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 11 Lighting: Main Building - Office Space - Oc Sensor Replace with FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $15 $300 0.75 19.6 12 Air Tightening Perform air sealing to reduce air leakage by 20%. $82 $1,000 0.73 12.2 13 Ventilation Provide New AHU using premium efficient motors and CO2 control. The cost of this measure is the *repair* cost difference between a standard AHU and a high-efficiency system with premium efficient motors and CO2 control. $263 $4,600 0.68 17.5 14 Lighting: Main Building - Office Space - No Oc Sensor Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $25 $600 0.61 23.6 15 Cathedral Ceiling: Main Building - Hot Roof Install R-10 rigid board insulation. No cost included for covering insulation. $107 $5,540 0.45 51.8 16 Exterior Door: Main Building - Man Door Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $8 $410 0.44 52.7 17 Window/Skylight: Main Building - Main Entry Door Replace sliding glass door with R-2.8 door. $26 $1,680 0.26 63.7 18 Window/Skylight: Main Building - Entry Transom Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $23 $1,500 0.25 65.6 19 Lighting: Main Building - Office Space - No Oc Sensor Replace with 5 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic $7 $750 0.13 108.7 20 Lighting: Main Building - Utility - No Oc Sensor Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $2 $300 0.11 133.1 21 Window/Skylight: Main Building - Other Windows Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $84 $18,150 0.08 217.2 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 22 Window/Skylight: Main Building - South Windows Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $20 $6,600 0.05 325.5 TOTAL $3,002 $54,830 1.31 18.3 ENERGY AUDIT REPORT – ENERGY CONSERVATION RECOMMENDATIONS 1. Building Envelope Insulation Rank Location Existing Type/R-Value Recommendation Type/R- Value Installed Cost Annual Energy Savings 15 Cathedral Ceiling: Main Building - Hot Roof Framing Type: Standard Framing Spacing: 24 inches Insulated Sheathing: XPS (Blue/Pink Foam), 3.5 inches Bottom Insulation Layer: None Top Insulation Layer: None Modeled R-Value: 20.8 Install R-10 rigid board insulation. No cost included for covering insulation. $5,540 $107 Exterior Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 16 Exterior Door: Main Building - Man Door 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. $410 $8 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 17 Window/Skylight: Main Building - Main Entry Door 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 sliding glass door with R-2.8 door. $1,680 $26 18 Window/Skylight: Main Building - Entry Transom Glass: Single, Glass Frame: Aluminum, No Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U-Value: 1.30 Solar Heat Gain Coefficient including Window Coverings: 0.52 Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $1,500 $23 21 Window/Skylight: Main Building - Other Windows Glass: Double, glass Frame: Wood\Vinyl Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U-Value: 0.51 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $18,150 $84 22 Window/Skylight: Main Building - South Windows Glass: Double, Low-E Frame: Wood\Vinyl Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U-Value: 0.42 Solar Heat Gain Coefficient including Window Coverings: 0.43 Replace existing windows with Low E/argon fiberglass or insulated vinyl windows $6,600 $20 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 12 Air Tightness estimated as: 3650 cfm at 50 Pascals Perform air sealing to reduce air leakage by 20%. $1,000 $82 2. Mechanical Equipment Mechanical Rank Recommendation Installed Cost Annual Energy Savings 2 New Weil-McLain Ultra Boiler $6,000 $967 Setback Thermostat Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 1 Main Building Existing Unoccupied Heating Setpoint: 70.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Main Building space. $500 $411 Ventilation Rank Recommendation Cost Annual Energy Savings 13 Provide New AHU using premium efficient motors and CO2 control. The cost of this measure is the *repair* cost difference between a standard AHU and a high- efficiency system with premium efficient motors and CO2 control. $4,600 $263 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 3 Main Building - Kitchen 2 FLUOR (2) T12 F40T12 35W U-Tube Energy-Saver Magnetic with Manual Switching Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor and Improve Manual Switching $550 $191 4 Main Building - Vestibule 6 INCAN A Lamp, Std 100W with Manual Switching Replace with 6 FLUOR CFL, A Lamp 20W $300 $180 5 Main Building - Restroom - Oc Sensor 2 INCAN A Lamp, Std 100W with Manual Switching Replace with 2 FLUOR CFL, A Lamp 20W and Add new Occupancy Sensor $400 $77 6 Main Building - Office Space - Oc Sensor 10 FLUOR (4) T12 4' F40T12 34W Energy-Saver Magnetic with Manual Switching Replace with 10 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $2,100 $261 7 Main Building - Restroom - Oc Sensor 2 FLUOR (2) T12 4' F40T12 34W Energy-Saver Magnetic with Manual Switching Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic and Add new Occupancy Sensor $550 $45 8 Main Building - Office Space - Oc Sensor 6 FLUOR (4) T12 4' F40T12 34W Energy-Saver StdElectronic with Manual Switching Replace with 6 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $1,050 $84 9 Main Building - Office Space - No Oc Sensor 6 FLUOR (2) T12 4' F40T12 34W Energy-Saver Magnetic with Manual Switching Replace with 6 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic $900 $59 10 Main Building - Office Space - No Oc Sensor 7 FLUOR (2) T12 4' F40T12 34W Energy-Saver Magnetic with Manual Switching Replace with 7 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $1,050 $62 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 11 Main Building - Office Space - Oc Sensor FLUOR (2) T12 4' F40T12 34W Energy-Saver Magnetic with Manual Switching Replace with FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic and Add new Occupancy Sensor $300 $15 14 Main Building - Office Space - No Oc Sensor 3 FLUOR (2) T12 F40T12 35W U-Tube Energy-Saver Magnetic with Manual Switching Replace with 3 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $600 $25 19 Main Building - Office Space - No Oc Sensor 5 FLUOR (4) T12 4' F40T12 34W Energy-Saver StdElectronic with Manual Switching Replace with 5 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic $750 $7 20 Main Building - Utility - No Oc Sensor 2 FLUOR (2) T12 4' F40T12 34W Energy-Saver Magnetic with Manual Switching Replace with 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic $300 $2 ------------------------------------------ AkWarmCalc Ver 2.1.4.2, Energy Lib 3/1/2012 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Appendix E Energy Conservation Measures ASD Operations Portable Buildings Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 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 Setback Thermostat: Portable Building Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Portable Building space. $1,010 $2,000 5.93 2 2 Exterior Door: Portable Building - Doors Remove existing door and install standard pre-hung U-0.16 insulated door, including hardware. $109 $820 2.54 7.6 3 Cathedral Ceiling: Portable Building - Hot Roof Add R-19 to existing insulation. $203 $2,520 1.55 12.4 4 Air Tightening Perform air sealing to reduce air leakage by 20%. $79 $650 1.02 8.2 5 Exposed Floor: Portable Building - Floor Remove insulation from 2x8 cavity and replace with R-30 fiberglass batts. $91 $1,890 0.92 20.9 6 Window/Skylight: Portable Building - Windows Replace existing window with U-0.22 vinyl window $225 $5,917 0.56 26.3 7 Lighting: Portable Lighting Replace with 20 FLUOR (2) T8 4' F32T8 28W Energy-Saver Instant HighEfficElectronic $36 $2,000 0.26 55.9 8 Above-Grade Wall: Portable Building - 2x4 Stud Wall Install R-10 rigid foam board to exterior and cover with T1-11 siding or equivalent. $373 $36,881 0.19 99 TOTAL $2,125 $52,678 0.59 24.8 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS 2. Building Envelope Insulation Rank Location Existing Type/R-Value Recommendation Type/R- Value Installed Cost Annual Energy Savings 3 Cathedral Ceiling: Portable Building - Hot 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 Add R-19 to existing insulation. $2,520 $203 5 Exposed Floor: Portable Building - Floor Framing Type: 2 x Lumber Insulating Sheathing: None Top Insulation Layer: None Bottom Insulation Layer: R-19 Batt:FG or RW, 6 inches Modeled R-Value: 25.2 Remove insulation from 2x8 cavity and replace with R-30 fiberglass batts. $1,890 $91 8 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-10 rigid foam board to exterior and cover with T1-11 siding or equivalent. $36,881 $373 Exterior Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 2 Exterior Door: Portable Building - Doors Door Type: Entrance, Metal, fiberglass core; metal edge Modeled R-Value: 1.7 Remove existing door and install standard pre-hung U- 0.16 insulated door, including hardware. $820 $109 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Windows and Glass Doors – Replacement Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 6 Window/Skylight: Portable Building - Windows Glass: Double, glass Frame: Wood\Vinyl Spacing Between Layers: Quarter Inch Gas Fill Type: Air Modeled U-Value: 0.56 Solar Heat Gain Coefficient including Window Coverings: 0.46 Replace existing window with U-0.22 vinyl window $5,917 $225 Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 4 Air Tightness estimated as: 818 cfm at 50 Pascals Perform air sealing to reduce air leakage by 20%. $650 $79 2. Mechanical Equipment Setback Thermostat Rank Location Size/Type/Condition Recommendation Installed Cost Annual Energy Savings 1 Portable Building Existing Unoccupied Heating Setpoint: 70.0 deg F Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Portable Building space. $2,000 $1,010 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 7 Portable Lighting 20 FLUOR (2) T12 4' F40T12 40W Standard Magnetic with Manual Switching Replace with 20 FLUOR (2) T8 4' F32T8 28W Energy-Saver Instant HighEfficElectronic $2,000 $36 ------------------------------------------ AkWarmCalc Ver 2.1.4.2, Energy Lib 3/1/2012 Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 Appendix F Site Visit Photos Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 1. Front of Building 2. Roof of Operations Building. 3. Natural Gas Hot Water Heater 4. Natural Gas Boiler (B-1) Anchorage School District Operations Building Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-04 5. Rooftop Air Handling Unit 6. Motor and Fan in Air Handling Unit End of Report