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Home My WebLink AboutCIRI-WOW-CAEC Houston High School 2012-EE ENERGY AUDIT FINAL REPORT Houston High School 12501 West Hawk Lane Houston, AK 99694 p (907) 892-9400 AkWarm ID No. CIRI-WOW-CAEC-02 800 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 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 i AkWarm No. CIRI-WOW-CAEC-02 Contents I. Executive Summary .................................................................................................................. 1 II. Introduction .............................................................................................................................. 4 III. Energy Audit Process ............................................................................................................. 5 IV. Method of Analysis ................................................................................................................. 6 V. Building Description ................................................................................................................ 7 V.I ARCHITECTURAL DESCRIPTION ............................................................................................................................ 8 V.II MECHANICAL DESCRIPTION ............................................................................................................................... 8 V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 9 VI. Historic Energy Consumption and Cost............................................................................. 10 VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 10 VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 10 VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 10 VII. Equipment Inventory and Photo Survey .......................................................................... 12 VIII. Energy Conservation Measures ....................................................................................... 13 VIII.I ENERGY CONSERVATION MEASURES ............................................................................................................. 13 VIII.II ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ......................................... 17 Appendices Appendix A – Energy Benchmark Data Appendix B – AkWarm Commercial Reports Appendix C – Major Equipment List Appendix D – Energy Conservation Measures – Houston High School Appendix E – Site Survey Photos Appendix F – Thermographic Photos Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 ii AkWarm No. CIRI-WOW-CAEC-02 Abbreviations AHFC Alaska Housing & Finance Corporation ARRA American Recovery & Reinvestment Act 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 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 iii AkWarm No. CIRI-WOW-CAEC-02 List of Figures Fig. 1 – Energy Audit Clients ....................................................................................................................... 1 Fig. 2 – Energy Benchmark Data .................................................................................................................. 1 Fig. 3 – Houston High School, Houston, Alaska – Google Maps ................................................................ 4 Fig. 4 – Houston High School – Google Maps ............................................................................................. 4 Fig. 5 – Houston High School First Floor Plan ............................................................................................. 7 Fig. 6 – Houston High School Second Floor Plan ........................................................................................ 7 List of Tables Table 1 – Recommended Energy Conservation Measures, Houston High School ....................................... 2 Table 2 – Energy Cost and Consumption Data ........................................................................................... 10 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 iv AkWarm No. CIRI-WOW-CAEC-02 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. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 1 AkWarm No. CIRI-WOW-CAEC-02 I. Executive Summary This report presents the findings of an energy audit conducted at Houston High School as part of a contract for: Alaska Housing Finance Corporation Contact: Rebekah Luhrs 4300 Boniface Parkway Anchorage, AK 99510 Email: rluhrs@ahfc.us Matanuska-Susitna Borough School District Contact: Rick Jensen 501 N Gulkana Street Palmer, AK 99645 Email: ricky.jensen@matsuk12.us 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 $ 99,198 Natural Gas $ 58,811 Total $158,009 January 2009-December 2010 Energy Utilization Index (EUI) = 99.9 kBtu/sf January 2009-December 2010 Energy Cost Index = 1.75 $/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. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 2 AkWarm No. CIRI-WOW-CAEC-02 Table 1 – Recommended Energy Conservation Measures, Houston High School Houston High School (HHS) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) HHS-1a Refrigerators Replace residential & light commercial refrigerators/freezers older than 5 years old -- - <10 HHS-2 Ventilation Add 4 CO2 Sensors to Return Air ductwork in AHU-1, -2, -3, -5 & CO2 Control to DDC System $7,170 $15,000 6.14 2.1 HHS-3 Lighting: Staff Rooms Add new occupancy sensors $193 $600 4.69 3.1 HHS-4 Lighting: Library Add new occupancy sensors $371 $1,200 4.51 3.23 HHS-5 Lighting: Corridors and Lobby Replace the 400W Metal Halide light fixtures with four-lamp T5HO fluorescent light fixtures, revise wiring to remove night-lights, and add a new occupancy sensor $5,252 $24,700 3.11 4.7 HHS-6 Lighting: Offices Add new occupancy sensors and revise wiring to remove night lights $167 $850 2.88 5.1 HHS-7 Lighting: Gym Replace the 400W Metal Halide light fixtures with T5HO fluorescent light fixtures, remove night- lights, retrofit lighting controls, and add new occupancy sensors $2,700 $27,600 1.43 10.2 HHS-8 Lighting: Cafeteria Replace the 400W Metal Halide light fixtures with four-lamp T5HO fluorescent light fixtures $1,824 $19,800 1.35 10.9 HHS-9 Lighting: Exterior Replace the building and pole mounted High Pressure Sodium light fixtures with LED fixtures $8,676 $110,600 1.14 12.7 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 3 AkWarm No. CIRI-WOW-CAEC-02 Houston High School (HHS) Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) HHS-10 Lighting: Storage Rooms Add new occupancy sensors $35 $450 1.12 12.9 HHS-11 Air Tightening Perform air sealing to reduce air leakage by 20%. $1,479 $13,000 1.01 8.8 HHS-12 Lighting: Classrooms Replace the three and four- lamp fluorescent classroom fixtures with two lamp fixtures and add new occupancy sensors $5,441 $79,050 1.00 14.5 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. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 4 AkWarm No. CIRI-WOW-CAEC-02 II. Introduction This energy audit was conducted at Houston High School (HHS) for AHFC and Matanuska-Susitna Borough School District (MSBSD). The school is an approximately 90,264 square foot (sf) campus that includes classrooms, locker rooms, restrooms, administrative offices, a library, a gymnasium, and a multipurpose room. 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 – Houston High School, Houston, Alaska – Google Maps Fig. 4 – Houston High School – Google Maps Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 5 AkWarm No. CIRI-WOW-CAEC-02 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, 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 20, 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. Rick Jensen of the MSBSD Maintenance 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. Rick Jensen, (907) 354-0348 (mobile), (907) 864-2007 (office) Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 6 AkWarm No. CIRI-WOW-CAEC-02 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 shops, kitchens, offices, gyms, multipurpose rooms, 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. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 7 AkWarm No. CIRI-WOW-CAEC-02 V. Building Description Houston High School is a two story building with a variety of space usages and schedules. The exterior structure is an insulated finish system over a studwall. The school was built in 2003. The only renovation since construction has been a moderate change to the heating system. The facility is operated from 6am to 11pm, five days a week during the school year, and is open on weekends for school sports and community activities. The school is shut down to the greatest extent possible during summer months. The school year runs from mid-August until late May. Fig. 5 – Houston High School First Floor Plan Fig. 6 – Houston High School Second Floor Plan Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 8 AkWarm No. CIRI-WOW-CAEC-02 V.I Architectural Description Most of the school’s exterior walls consist of an exterior insulated finish system, gypsum board sheathing, 6” studs with batt infill, and the interior gypsum board. This typical wall construction provides for an overall insulating value of R-21.9. The gymnasium walls are nearly identical; however, a 4” precast concrete panel is added to the construction on the interior face, providing an insulating value of R-22.4. Most walls are approximately 27’ high. There is approximately 7,950 sf of gym wall face area, and 33,000 sf of face area for the typical wall construction. Floor construction for the school consists of slab-on grade. Foundation walls are insulated with 2” of rigid insulation covering the floor slab edge and extending approximately 4’ below grade. The building has a 65,234 sf footprint with approximately 25,030 sf of second floor and utility space, for a total of 90,264 sf of usable floor area. Roof construction consists of metal decking, gypsum wallboard, a waterproof membrane, rigid insulation, and ballast-supported pavers which provide a slope for drainage. This construction provides an insulating value of approximately R-33. There is approximately 65,234 sf of roof area. Typical window construction consists of double-paned low emissivity windows with vinyl frames. An estimated insulating value of R-2.4 was used for modeling purposes. There is a total of approximately 3,628 sf of window area for the school. There are two main door types for the school. There are 20 windowless, insulated hollow metal doors with an insulating value of R-2.7. Eleven doors are half-lite, insulated hollow metal with an insulating value of R-1.7. Each of the half-lite windows feature double panes with 1/2” air space. There are two overhead doors; one for the shops and one for the loading bay. These doors appear to be insulated metal doors with a thermal break. There is a total of 180 sf of overhead door area, with an estimated insulating value of R-3.4. V.II Mechanical Description The school's heat is provided by two Weil-McLain model 88 cast iron sectional boilers, each rated for 5,124 MBH natural gas input. Both are equipped with Gordon-Piatt burners and the heating system medium is water. Conduction and infiltration heating loads are accomplished with perimeter baseboard heating and terminal unit heaters. Ventilation heating is provided by heating coils using glycol, heated by the central heating system via water-to-glycol heat exchangers located in each fan room. No mechanical cooling is provided for any systems in the facility. There are five air handling units (AHUs) serving Houston High School. All of the AHUs are original construction Scott Springfield series appropriately sized for their individual applications. AHU-1, 2, and 5 are variable air volume (VAV) units with variable frequency drive (VFD) equipped motors. AHU-1 is equipped with a 40 horsepower (HP) motor and serves up to 38,000 cubic feet per minute (CFM) of air to the school's classrooms. AHU-2 serves 26,000 CFM of air via a 30 HP motor to the Art, Music, and Library areas. AHU-5 provides 6,600 CFM of air to the school offices with a 7.5 HP motor. AHU-3 is a two-speed, constant volume unit that serves the commons, multipurpose room, kitchen, and stage areas with 24,000 CFM of air using a 25 HP motor. AHU-4 is a two-speed, constant volume unit supply the gym, technical education, and locker room areas with 33,000 CFM of air using a 30 HP motor. Two gas-fired water heaters, both PVI model MAXIM 72P-250A, provide domestic hot water for the school. Each heater is rated for 720 MBH natural gas input and has a storage capacity of 250 gallons. The system is engineered for constant hot water recirculation, using a Grundfos type UP 15-42 inline circulator pump. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 9 AkWarm No. CIRI-WOW-CAEC-02 The building's domestic cold water is provided by a local well system, which primarily fills a 24,500 gallon storage tank. The tank is located below grade, approximately 250 ft northwest of the building. Water is delivered to the building through a 5-inch domestic water line and 10-inch fire water line. A Tigerflow triplex pump system distributes the domestic water throughout the building. The school's building energy management and control system is controlled using a direct digital control (DDC) system. The system has been adequately maintained and appeared to be in good working order during the site visit. The energy management and control system controls the boilers, water pumps, glycol pumps, and supply fans. V.III Electrical Description The School is served by a 2000 Amp (A), 277/480 Volt (V), three-phase, four-wire, underground electrical service connected to a pad-mounted utility transformer. The school has a 200kW standby diesel generator used to power selected loads in the event of a power outage. Inside the school, 277/480V power is used to serve large mechanical loads and lighting. A dry type transformer is used to step the voltage to 120/208V, three phase for receptacle loads, computers, and kitchen equipment. Since the passage of the Energy Policy Act of 2005, all general purpose transformers have been required to meet the efficiency requirements listed in the National Electrical Manufacturer's Association publication NEMA TP1-2002. There are energy savings available by replacing these transformers with new models that meet or exceed the standard, however caution must be exercised as replacing transformers impacts available fault current and over-current protection device selective coordination. The replacement of the school’s existing transformers to meet NEMA requirements can only be recommended after performing a power system analysis. That level of study is outside the scope of this project. The school is primarily illuminated by fluorescent T8 light fixtures with rapid start electronic ballasts. Rapid start electronic ballasts are beneficial since they are compatible with the use of occupancy sensors. Approximately 95% of the fixtures used to illuminate the classrooms are 2'x4' troffer fixtures that are controlled by wall switches and feature inboard/outboard bi-level switching. The remaining fixtures used to illuminate the classroom areas consist of 32W compact fluorescent lamp (CFL) down lights, and two- lamp 2'x4' troffers, while the shop and art classes are illuminated by four-lamp 2'x4' troffers. The lighting throughout the classroom spaces was observed to be in excess of the values recommended by the Illuminating Engineering Society of North America (IESNA). The corridors, vestibules, and main lobby area are illuminated by a mix of CFL, T8 fluorescent and 400W metal halide (MH) light fixtures controlled by occupancy sensors that reduce the T8 fixtures to 50% of normal when the corridors are unoccupied. Approximately 30% of the fluorescent fixtures are used as night lights and are never switched off. The gym and cafeteria are illuminated with 400W MH light fixtures. Occupancy sensors are used in the gym to reduce the lighting levels to 50% when the space is unoccupied, but due to the long strike times associated with MH fixtures, these fixtures typically remain on even if the space is unoccupied for extended periods of time. The building mounted exterior lighting consists of 100W canopy, and wallpack light fixtures. Area lighting is provided by 150W and 400W pole-mounted fixtures. Pole mounted fixtures are present in single, double, and triple-headed configurations. All of the lighting is high pressure sodium (HPS) with the exception of seven LED single head pole mounted area lights. These lights are controlled by an on/off photo switch that turns the lights off during the day. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 10 AkWarm No. CIRI-WOW-CAEC-02 Other electricity-using equipment not previously described in the mechanical or electrical sections include a shop tools, microwaves, a walk in freezer, various other kitchen equipment, and various user equipment such as projectors, computers, and printers. VI. Historic Energy Consumption and Cost Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and natural gas energy usage for the surveyed facility from January 2009 to December 2010. Matanuska Electric Association provides the electricity and Enstar Natural Gas provides the gas to the building. Both utility companies bill the facility using a commercial rate schedule. The actual utility bills were not provided to be able to verify the data received to assure 100 percent accuracy of the data. The AkWarm model of the facility was built to match the facility’s average annual electric and natural gas consumption, so that a realistic model could be created. The monthly energy consumption of the AkWarm model matches the actual average monthly consumption of the facility within 25%, which is adequate for this level of modeling. Overall, the energy consumption trends of the AkWarm model and the actual facility match appropriately. Graphical representations of the monthly energy consumption are included in Appendix A. VI.I Electrical Consumption Data The electric utility costs consist of several components: a fixed monthly customer charge, an energy usage charge, fuel surcharge, taxes, and a demand charge. The energy usage and fuel surcharge are based on the customer's usage as measured in kilowatt-hours (kWh). The usage (kWh) is determined by load wattage divided by 1,000, times hours running. For example, a 1,000 watt 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 2 – Energy Cost and Consumption Data Energy Cost and Consumption Data 2009 2010 Average Electric 0.14 $/kWh 0.11 $/kWh 0.13 $/kWh Natural Gas 0.99 $/CCF 0.86 $/CCF 0.93 $/CCF Total Cost $171,898 $144,120 $158,009 ECI 1.90 $/sf 1.60 $/sf 1.75 $/sf Electric EUI 29.1 kBtu/sf 29.9 kBtu/sf 29.5 kBtu/sf Natural Gas EUI 70.5 kBtu/sf 70.3 kBtu/sf 70.4 kBtu/sf Building EUI 99.6 kBtu/sf 100.2 kBtu/sf 99.9 kBtu/sf Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 11 AkWarm No. CIRI-WOW-CAEC-02 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 90,264 square feet. 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. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 12 AkWarm No. CIRI-WOW-CAEC-02 VII. Equipment Inventory and Photo Survey Following the completion of the field survey a detailed equipment list was created and is attached as Appendix C. The major equipment listed are considered to be the major energy consuming equipment in the building whose replacement could yield substantial energy savings. An approximate age was assigned to the equipment if a manufactured date was not shown on the equipment’s nameplate. As listed in the 2011 ASHRAE Handbook for HVAC Applications, Chapter 37, Table 4, the service life for the equipment along with the remaining useful life in accordance to the ASHRAE standard are also noted in the equipment list. Where there are zero (0) years remaining in the estimated useful life of a piece of equipment, this is an indication that maintenance costs are likely on the rise and more efficient replacement equipment is available which will lower the operating costs of the unit. Maintenance costs should also fall with the replacement. Additionally, photos of various equipment and the building construction were taken during the site visit. Several photos are included in Appendix E. CEI made miscellaneous thermographic images of the building using a FLIR T300 Infrared Camera. This is not a thermographic study, but rather just a few snapshots to illustrate easy-to-identify heat losses. These thermographic photos are included in Appendix F. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 13 AkWarm No. CIRI-WOW-CAEC-02 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. Several HVAC upgrades were considered. Since the school is relatively new and in good condition, few proved financially viable. One upgrade considered stack economizers to both boilers (both boilers are too large to be piped to a common stack economizer). Another upgrade was to remove and replace one existing boiler with a high-efficiency condensing boiler, such as an Aerco Benchmark. Such an upgrade would use the new high efficiency boiler as the primary, and use the remaining existing boiler as backup. Pumping efficiency improvements had already been incorporated when the facility was built, so no alternatives were modeled. The demand ventilation control (CO2 sensors) did prove viable, and is recommended. It is nonetheless important for the school operations and maintenance department to maintain strict adherence to efficient operating procedures, control sequences, and maintenance in order to achieve the HVAC efficiency potential of this facility. VIII.I Energy Conservation Measures ECM# HHS-1 – 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, which are older than five years old, with new energy star models will typically have paybacks of less than 10 years. ECM# HHS-2 – Add 4 CO2 Sensors to Return Air ductwork in AHU-1, -2, -3, -5 & CO2 Control to DDC System Annual Energy Savings Installed Cost SIR Payback (years) $7,170 $15,000 6.14 2.1 Currently, there is only one AHU at HHS with CO2 outside air control. By adding DDC control points, including CO2 sensors in return air ductwork of AHU-1, -2, -3, and -5, and more damper actuators to fine-tune the amount of outside air drawn into the building, heating loads can be reduced while still meeting ventilation code requirements. See item 33 in Appendix D for more information. ECM# HHS-3 - Upgrade the Staff Room Lighting Control Annual Energy Savings Installed Cost SIR Payback (years) $193 $600 4.69 3.1 There are four staff work rooms in the school. The lighting in one of these rooms is controlled by a occupancy sensor that shuts the lights off while the room is unoccupied. This ECM consists of installing Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 14 AkWarm No. CIRI-WOW-CAEC-02 four new ceiling mounted occupancy sensors in the remaining three rooms, to control the existing light fixtures. Please note that room 103 will require two occupancy sensors. See items 7 and 21 in Appendix D for more information. ECM# HHS-4 - Upgrade the Library Lighting Control Annual Energy Savings Installed Cost SIR Payback (years) $371 $1,200 4.51 3.23 This ECM consists of installing new occupancy sensors to control the light fixtures in the library and the adjacent student government room. Approximately five ceiling mounted occupancy sensors should be used to control the lighting in the library, while only one ceiling mounted occupancy sensor will be required in the student government room. See items 4, 8, 12, and 20 in Appendix D for more information. ECM# HHS-5 - Upgrade the Corridor and Lobby Lighting Annual Energy Savings Installed Cost SIR Payback (years) $5,252 $24,700 3.11 4.7 The main lobby is illuminated by approximately (29) recessed 2'x2' 400W MH down lights, and two decorative 400W MH pendant fixtures. The lighting in the corridors consists of two-lamp 13W, 18W, and 32W compact fluorescent lamp (CFL) fixtures, and two and three-lamp 4' fluorescent T8 light fixtures. With the exception of the corridor from the cafeteria to the loading dock, the corridors feature occupancy sensor control that reduces the lighting levels when the spaces are unoccupied. The corridor that leads to the loading dock is illuminated by three two-lamp T8 fixtures that are controlled by a wall switch and one two-lamp T8 night light that is never switched off. Based on the construction documents five 32W CFL and (53) two-lamp T8 fixtures are used as night lights and never switched off in the remaining corridor areas. It is recommended that a new ceiling mounted occupancy sensor is installed in the corridor leading to the loading dock, and that the night lights be re-wired to switch with their local lighting circuits. This ECM also recommends replacing the 400W MH light fixtures by replaced with four-lamp T5HO fluorescent light fixtures. See items 2, 5, 10, 18, 19, and 37 in Appendix D. ECM# HHS-6 - Upgrade the Office Lighting and Control Annual Energy Savings Installed Cost SIR Payback (years) $167 $850 2.88 5.1 Four private offices were observed to use wall mounted rocker switches for lighting control, while the remaining 18 use occupancy sensors that switch the lights off while the spaces are unoccupied. It is recommended that the four offices with wall switch control be provided new ceiling mounted occupancy sensors to switch the lights off while the rooms are vacant. Additionally there is a single three-lamp fluorescent T8 un-switched night light present in the main office that should be re-wired to the existing switch. Please note that due to the use of the main office it is not recommended that new occupancy sensors be installed. See items 1, 13, 22, and 29 in Appendix D for more information. ECM# HHS-7 - Upgrade the Gym Lighting and Controls Annual Energy Savings Installed Cost SIR Payback (years) $2,700 $27,600 1.43 10.2 The gymnasium is illuminated by (34) 400W MH high bay light fixtures with bi-level occupancy sensor control. Because of the long strike time associated with MH lamps the occupancy sensors reduce the lighting in the gymnasium to 50% rather than shutting them completely off. Additional lighting is Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 15 AkWarm No. CIRI-WOW-CAEC-02 provided by (8) four-lamp fluorescent T8 night lights powered by the standby power system. The adjacent locker rooms are illuminated by approximately (60) two-lamp light fixtures that are controlled by wall switches. The three gym storage spaces are illuminated by (3) two-lamp, and (17) four-lamp T8 light fixtures and are all controlled by wall switches. Lighting in the mat and weight rooms consists of (50) three-lamp inboard/outboard switched T8 fixtures that are controlled by wall switches. This ECM includes replacing the 400W MH fixtures one-for-one with 6-lamp T5HO fixtures with bi- level switching, demolishing the night lights, and installing occupancy sensors in the remaining spaces adjacent to the gymnasium. The existing gymnasium lighting controls will likely need to be revised to integrate with the new light fixtures. Approximately six ceiling mounted occupancy sensors will be required in the each of the two locker rooms, while only one occupancy sensor will be required in each of the three storage areas. The mat and weight rooms were modeled with three ceiling mounted occupancy sensors each that only control the inboard ballasts to eliminate any safety concerns over nuisance switching. See items 11, 14, 15, 17, 25, 28, and 38 in Appendix D for additional information. ECM# HHS-8 - Upgrade the Cafeteria Lighting Annual Energy Savings Installed Cost SIR Payback (years) $1,824 $19,800 1.35 10.9 The cafeteria is illuminated by (21) 400W MH decorative pendant, and (12) 400W MH recessed 2'x2' light fixtures. It is recommended that these fixtures be replaces one-for-one with four-lamp T5HO light fixtures. See item 23 in Appendix D for more information. ECM# HHS-9 - Upgrade the Exterior Lighting Annual Energy Savings Installed Cost SIR Payback (years) $8,676 $110,600 1.14 12.7 The building mounted exterior lighting at the school consists of (6) 100W pendant and (15) 100W wall pack light fixtures. Site lighting consists of (7) 150W LED, (7) 400W HPS, and (21) twin head 400W pole mounted area lighters. It is recommended that the 100W and 400W fixtures be replaced one-for-one with 50W and 150W LED light fixtures. Installation costs assume the re-use of existing wiring. Upgrading the hockey rink light fixtures with LED fixtures was evaluated. However, the measure did not result in an SIR>1 due to the usage schedule of these lights. This description compiles measures 26, 27, 31, and 32 which were individually modeled in AkWarm. See Appendix D for details of individual measures. ECM# HHS-10 - Upgrade the Storage Room Lighting Controls Annual Energy Savings Installed Cost SIR Payback (years) $35 $450 1.12 12.9 The lighting controls in a majority of the storage areas in the school consists of wall mounted occupancy sensors, however three of the general use storage areas use wall mounted rocker switches for control. It is recommended that the wall mounted rocker switched be replaced with wall mounted occupancy sensors. See items 24, and 35 in Appendix D for more information. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 16 AkWarm No. CIRI-WOW-CAEC-02 ECM # HHS-11 – Perform Air Sealing to Reduce Air Leakage by 20% Annual Energy Savings Installed Cost SIR Payback (years) $1,479 $13,000 1.01 8.8 Unconditioned infiltration air, leaking through doors, windows, and other building envelope penetrations contributes to the heating load of the building. Methods to decrease the infiltration into the building include: sealing around roof and wall penetrations with caulking and insulation, gasketing mechanical louvers or hoods, providing gaskets to all exterior cover plates, and adding or repairing weather stripping around exterior doors. To achieve a viable economic benefit, up to $13,000 can be invested and still achieve an SIR > 1 by reducing air leakage by 20%. Details of the ECM are shown in item 30 in Appendix D. ECM# HHS-12 - Upgrade the Classroom Lighting and Controls Annual Energy Savings Installed Cost SIR Payback (years) $5,441 $79,050 1.00 14.5 With the exception of the art room, the classrooms are all predominantly illuminated by (462) three-lamp fluorescent T8 flat lensed troffer fixtures with inboard/outboard multi-level control. The art room is illuminated by (24) four-lamp T8 flat lensed troffer fixtures with bi-level control. Five 32W CFL down lights and four two-lamp T8 fixtures are also present in the classrooms. All of the classrooms exceed the suggested illumination levels by the IESNA and may be reduced. This ECM consists of retrofitting all of the existing three and four lamp fixtures with two lamp volumetric troffer retrofit kits with bi-level switching. Additionally a ceiling mounted occupancy sensor should be installed in each of the 30 classrooms. A new occupancy sensor should also be installed in the storage area off of classroom 203. See items 3, 6, 9, 16, 34, 36, and 40 in Appendix D for more information. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 17 AkWarm No. CIRI-WOW-CAEC-02 VIII.II Administrative Controls for Energy Conservation and Optimization While the intent of many energy conservation measures is to increase the efficiency of fuel-burning and electrical equipment, an important factor of energy consumption lies in the operational profiles which control the equipment usage. Such profiles can be managed by administrative controls and departmental leadership. They determine how and when fuel-burning and electrical equipment are used, and therefore have a greater impact on energy savings potential than simply equipment upgrades alone. Significant energy cost savings can be realized when ECMs are combined with efficient-minded operational profiles. Operational profiles may be outlined by organization policy or developed naturally or historically. These profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies, maintenance schedules, and site and equipment selection. Optimization of operational profiles can be accomplished by numerous methods so long as the intent is reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost savings solely as a result of operational optimization are difficult to predict. Quantification, however, is easy to accomplish by metering energy usage during and/or after implementation of energy-saving operational profiles and ECMs. Shown below are some examples which have proven successful for other organizations. Optimization of site selection includes scheduling and location of events. If several buildings in a given neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after- hours events are consolidated and held within the most energy efficient buildings available for use. As a result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy consumption. Two operational behaviors which can be combined with equipment upgrades are operating schedules and equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun. Operating schedules can be optimized to run equipment only during regular or high-occupancy periods. Also, through a central control system, or with digital programmable thermostats, temperature setpoints can be reduced during low-occupancy hours to maximize savings. In addition, sporadically used equipment can be shut down during unoccupied hours to further save energy. In general, having equipment operating in areas where no occupants are present is inefficient, and presents an opportunity for energy savings. Operational profiles can also be implemented to take advantage of no- or low-cost ECMs. Examples include heating plant optimizations (boiler section cleaning, boiler flush-through cleaning) and tighter controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to and finer control of equipment for after-hours control). In a large facility management program, implementation of these measures across many or all sites will realize dramatic savings due to the quantity of equipment involved. Changes to building operational profiles can only be realized while simultaneously addressing health, safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or implement operational behaviors which do not meet such considerations. That said, it is quite practical for management groups to implement administrative controls which reduce losses brought about by excess and sub-optimum usage. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Appendix A Energy Benchmark Data First Name Last Name Middle Name Phone Rick Jensen 907-376-0806 State Zip AK 99645 Monday- Friday Saturday Sunday Holidays 7 am - 8 pm 0 0 0 Average # of Occupants During 424 0 0 0 Renovations / Notes Date None Facility Zip 88,379 99694 Email ricky.jensen@matsuk12.us Details Mi. 53 Parks Hwy Primary Operating Hours REAL Preliminary Benchmark Data Form PART I – FACILITY INFORMATION Facility Owner Mat-Su School District Building Name/ Identifier Building Usage Building Square Footage Facility Owned By Date 03/09/11Municipal Government/Subdivision Palmer501 N Gulkana St Houston High Education 90,264 Mailing Address Community Population Facility City Year Built 2003 Facility Address Building Type School Houston Contact Person City Notes PART II – ENERGY SOURCES Heating Oil Electricity Natural Gas Propane Wood Coal $ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton Other energy sources? Describe 1. Please check every energy source you use in the table below. If known, please enter the base rate you pay for the energy source. 2. Provide utilities bills for the most recent two-year period for each energy source you use. Any available drawings are kept at district office for maintenance. Houston High School Draft Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI)WOW)CAEC)02 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Houston High Buiding Size Input (sf) =90,264 2009 Natural Gas Consumption (Therms)63,654 2009 Natural Gas Cost ($)63,267 2009 Electric Consumption (kWh)769,520 2009 Electric Cost ($)108,631 2009 Total Energy Use (kBtu)8,991,762 2009 Total Energy Cost ($)171,898 Annual Energy Use Intensity (EUI) 2009 Natural Gas (kBtu/sf) 70.5 2009 Electricity (kBtu/sf)29.1 2009 Energy Utilization Index (kBtu/sf)99.6 Annual Energy Cost Index (ECI) 2009 Natural Gas Cost Index ($/sf)0.70 2009 Electric Cost Index ($/sf)1.20 2009 Energy Cost Index ($/sf)1.90 2010 Natural Gas Consumption (Therms)63,437 2010 Natural Gas Cost ($)54,356 2010 Electric Consumption (kWh)790,3202010 Electric Consumption (kWh)790,320 2010 Electric Cost ($)89,764 2010 Total Energy Use (kBtu)9,041,062 2010 Total Energy Cost ($)144,120 Annual Energy Use Intensity (EUI) 2010 Natural Gas (kBtu/sf)70.3 2010 Electricity (kBtu/sf)29.9 2010 Energy Utilization Index (kBtu/sf)100.2 Annual Energy Cost Index (ECI) 2010 Natural Gas Cost Index ($/sf)0.60 2010 Electric Cost Index ($/sf)0.99 20010 Energy Cost Index ($/sf)1.60 Note: 1 kWh = 3,413 Btu's 1 Therm = 100,000 Btu's 1 CF ≈ 1,000 Btu's Coffman Engineers, Inc. AkWarm No. CIRI)WOW)CAEC)02 Houston High School Draft Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Houston HighNatural GasBtus/CCF =100,000Provider Customer # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)ENSTARG232394 Jan-09 1/8/2009 2/9/2009 3212,62112,621$12,714$1.01ENSTARG232394 Feb-09 2/9/2009 3/10/2009298,4418,441$8,525$1.01ENSTARG232394 Mar-09 3/10/2009 4/8/2009297,1807,180$7,260$1.01ENSTARG232394 Apr-09 4/8/2009 5/11/2009334,5224,522$4,595$1.02ENSTARG232394 May-09 5/11/2009 6/10/2009301,6951,695$1,762$1.04ENSTARG232394 Jun-09 6/10/2009 7/9/200929167167$231$1.39ENSTARG232394 Jul-09 7/9/2009 8/7/200929650650$716$1.10ENSTARG232394 Aug-09 8/7/2009 9/10/2009342,2312,231$2,302$1.03ENSTARG232394 Sep-09 9/10/2009 10/8/2009283,8933,893$3,970$1.02ENSTARG232394 Oct-09 10/8/2009 11/9/2009325,7955,795$5,877$1.01ENSTARG232394 Nov-09 11/9/2009 12/9/2009308,9308,930$9,021$1.01ENSTARG232394 Dec-09 12/9/2009 1/8/2010307,5317,531$6,295$0.84ENSTARG232394 Jan-10 1/8/2010 2/8/2010319,1339,133$7,620$0.83ENSTARG232394 Feb-10 2/8/2010 3/8/2010286,5126,512$5,451$0.84ENSTARG232394 Mar-10 3/8/2010 4/7/2010306,5816,581$5,562$0.85ENSTARG232394 Apr-10 4/7/2010 5/5/2010284,7134,713$4,002$0.85ENSTARG232394 May-10 5/5/2010 6/7/2010331,6981,698$1,485$0.87ENSTARG232394Jun-106/7/20107/6/201029463463$454$0.98ENSTARG232394Jun-106/7/20107/6/201029463463$454$0.98ENSTARG232394 Jul-10 7/6/2010 8/4/201029251251$562$2.24ENSTARG232394 Aug-10 8/4/2010 9/2/2010291,6641,664$1,692$1.02ENSTARG232394 Sep-10 9/2/2010 10/5/2010334,1064,106$3,646$0.89ENSTARG232394 Oct-10 10/5/2010 11/3/2010296,4736,473$5,539$0.86ENSTARG232394 Nov-10 11/3/2010 12/7/20103410,28910,289$8,592$0.84ENSTARG232394 Dec-10 12/7/2010 1/12/20113611,55611,556$9,750$0.84Jan - 09 to Dec - 09 total:63,65463,6540$63,267$0Jan - 10 to Dec - 10 total:63,43763,4370$54,356$0$0.99$0.86Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 $4,000 $6,000 $8,000 $10,000 $12,000 $14,000 4,0006,0008,00010,00012,00014,000Natural Gas Cost ($)Natural Gas Consumption (Therms)Houston High - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $2,000 $4,000 02,0004,000Date (Mon - Yr)Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Houston HighElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)MEA E13002 Jan-09 12/28/2008 1/27/20093087,0402,971280$13,226$0.15MEA E13002 Feb-09 1/27/2009 2/26/20093079,1202,700278$12,141$0.15MEA E13002 Mar-09 2/26/2009 3/25/20092763,6002,171296$10,125$0.16MEA E13002 Apr-09 3/25/2009 4/27/20093375,7602,586244$10,546$0.14MEA E13002 May-09 4/27/2009 5/27/20093062,4002,130244$8,900$0.14MEA E13002 Jun-09 5/27/2009 6/28/20093224,320830154$3,767$0.15MEA E13002 Jul-09 6/28/2009 7/28/20093021,920748118$3,135$0.14MEA E13002 Aug-09 7/28/2009 8/26/20092951,4401,756256$7,237$0.14MEA E13002 Sep-09 8/26/2009 9/27/20093274,2402,534274$9,968$0.13MEA E13002 Oct-09 9/27/2009 10/27/20093072,3202,468292$9,445$0.13MEA E13002 Nov-09 10/27/2009 11/28/20093284,0002,867260$10,572$0.13MEA E13002 Dec-09 11/28/2009 12/26/20092873,3602,504295$9,569$0.13MEA E13002 Jan-10 12/26/2009 1/26/20103168,9602,354284$8,383$0.12MEA E13002 Feb-10 1/26/2010 2/22/20102767,5202,304248$8,056$0.12MEA E13002 Mar-10 2/22/2010 3/28/20103487,0402,971286$10,209$0.12MEA E13002 Apr-10 3/28/2010 4/27/20103076,3202,605234$8,230$0.11MEA E13002 May-10 4/27/2010 5/25/20102862,9602,149233$6,982$0.11MEAE13002Jun-105/25/20106/27/20103334,0801,163103$3,670$0.11MEAE13002Jun-105/25/20106/27/20103334,0801,163103$3,670$0.11MEA E13002 Jul-10 6/27/2010 7/27/20103026,48090473$2,834$0.11MEA E13002 Aug-10 7/27/2010 8/28/20103260,3202,059228$6,775$0.11MEA E13002 Sep-10 8/28/2010 9/27/20103073,8402,520268$8,222$0.11MEA E13002 Oct-10 9/27/2010 10/26/20102980,7202,755249$9,080$0.11MEA E13002 Nov-10 10/26/2010 11/28/20103379,6802,719253$9,001$0.11MEA E13002 Dec-10 11/28/2010 12/28/20103072,4002,471256$8,322$0.11Jan - 09 to Dec - 09 total:769,52026,2642,991$108,631$0Jan - 10 to Dec - 10 total:790,32026,9742,714$89,764$0$0.14$0.11Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 $4,000$6,000$8,000$10,000$12,000$14,00030,00040,00050,00060,00070,00080,00090,000100,000Electric Cost ($)Electric Consumption (kWh)Houston High - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$2,000$4,000010,00020,000Date (Mon - Yr)Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Appendix B AkWarm Commercial Reports Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/15/2012 4:54 PM General Project Information PROJECT INFORMATION AUDITOR INFORMATION Building: Houston High School Auditor Company: Coffman Engineers Address: 12501 West Hawk Lane Auditor Name: Walter Heins, PE, CCP, CxA, CEA City: Houston Auditor Address: 800 F Street Anchorage, AK 99501 Client Name: Rick Jensen Client Address: 501 North Gulkana Street Palmer, AK 99645 Auditor Phone: (907) 276-6664 Auditor FAX: (907) 276-5042 Client Phone: (907) 864-2007 Auditor Comment: Client FAX: Design Data Building Area: 90,264 square feet Design Heating Load: Design Loss at Space: 8,629,305 Btu/hour with Distribution Losses: 8,896,190 Btu/hour Plant Input Rating assuming 82.0% Plant Efficiency and 25% Safety Margin: 13,561,270 Btu/hour Note: Additional Capacity should be added for DHW load, if served. Typical Occupancy: 500 people Design Indoor Temperature: 68 deg F (building average) Actual City: Houston Design Outdoor Temperature: -18 deg F Weather/Fuel City: Houston Heating Degree Days: 10,810 deg F-days Utility Information Electric Utility: Matanuska Electric Assn. - Commercial - Lg Natural Gas Provider: Enstar Natural Gas - Commercial - Lg Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.930/ccf Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 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 $62,431 $0 $5,329 $59,178 $0 $5,698 $0 $0 $28,041 $0 $160,677 With Proposed Retrofits $58,917 $0 $5,329 $33,990 $0 $5,698 $0 $0 $28,374 $0 $132,307 SAVINGS $3,514 $0 $0 $25,188 $0 $0 $0 $0 -$333 $0 $28,370 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 $0$50,000$100,000$150,000$200,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 High School Annual Modeled Consumption (Blue) compared to Actual Electric (Left) and Natural Gas (Right) Consumption (Orange). Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 High School Monthly Modeled Consumption (Blue) compared to Actual Electric Consumption (Orange). Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 High School Monthly Modeled Consumption (Blue) compared to Actual Natural Gas Consumption (Orange) Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Appendix C Major Equipment List Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) BLR-1 BOILER RM A111 BUILDING HEATING WEIL MCLAIN BG-1688R CAST IRON GAS FIRED 3980 MBH 83% - 30 21 BLR-2 BOILER RM A111 BUILDING HEATING WEIL MCLAIN BG-1688R CAST IRON GAS FIRED 3980 MBH 83% - 30 21 WH-1 BOILER RM A111 DOMESTIC WATER HEATING PVI MAXIM 72 P 250A GAS FIRED WATER HEATER 720 MBH ≈ 85% 1/3 HP 21 12 WH-2 BOILER RM A111 DOMESTIC WATER HEATING PVI MAXIM 72 P 250A GAS FIRED WATER HEATER 721 MBH ≈ 85% 1/3 HP 21 12 AHU-1 FAN RM C300 CLASSROOMS SCOTT SPRING-FIELD HQ-400 VARIABLE AIR VOLUME 38000 CFM54" ≈ 90% 40 HP 25 16 AHU-2 FAN RM C300 ARTS, MUSIC, & LIBRARY SCOTT SPRING-FIELD HQ-280 VARIABLE AIR VOLUME 26000 CFM44" ≈ 90% 30 HP 25 16 AHU-3 FAN RM B200 COMMONS, CAFETERIA, KITCHEN, & STAGE SCOTT SPRING-FIELD HQ-280 TWO SPEED CONSTANT AIR VOLUME 24000 CFM44" ≈ 90% 25 HP 25 16 AHU-4 FAN RM B200 GYM, TECH ED, LOCKERS SCOTT SPRING-FIELD HQ-330 TWO SPEED CONSTANT AIR VOLUME 33000 CFM54" ≈ 90% 30 HP 25 16 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) AHU-5 FAN RM B200 OFFICES SCOTT SPRING-FIELD HQ-80 VARIABLE AIR VOLUME 6600 CFM 22" ≈ 85% 7.5 HP 25 16 MUA-1 ROOF KITCHEN HOOD GREENHECK DGX-112-H220-DBC GAS FIRED MAKE UP / EXHAUST AIR UNIT 550 MBH 4000 CFM ≈ 80% 3 HP 25 16 MUA-2 ROOF TECH EDUCATION PAINT BOOTH SUPPLY ICE BMA-115 GAS FIRED HEATER MAKE UP AIR HANDLER 636 MBH 5250 CFM ≈ 80% 5 HP 25 16 PMP-1/1A PMP-2/2A BOILER RM A111 BOILER CIRC GRUNDFOS UPS 80-160 F VERTICAL INLINE (REDUNDANT) 300 GPM 25' NEMA STANDARD 2050 W 10 1 PMP-3 PMP-4 BOILER RM A111 BUILDING CIRC GRUNDFOS 4.0LP5/4.3 VERTICAL INLINE 369 GPM 54' 91% 7.5 HP 10 1 PMP-5 PMP-6 BOILER RM A111 BUILDING CIRC GRUNDFOS 4.0LP5/4.3 VERTICAL INLINE 369 GPM 54' 91% 7.5 HP 10 1 PMP-7 FAN ROOM C300 AHU-1 HEATING COIL RECIRC GRUNDFOS UPS 32-80 INLINE 40 GPM 40' NEMA STANDARD 280 W 10 1 PMP-8 FAN ROOM C300 AHU-2 PREHEAT COIL RECIRC GRUNDFOS UPS 32-40 INLINE 20 GPM 10' NEMA STANDARD 115 W 10 1 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) PMP-9 FAN ROOM C300 AHU-2 HEATING COIL RECIRC GRUNDFOS UPS 32-80 INLINE 30 GPM 10' NEMA STANDARD 280 W 10 1 PMP-10 FAN ROOM B200 AHU-3 HEATING COIL RECIRC GRUNDFOS UPS 32-40 INLINE 20 GPM 10' NEMA STANDARD 115 W 10 1 PMP-11 FAN ROOM B200 AHU-4 HEATING COIL RECIRC GRUNDFOS UPS 32-80 INLINE 40 GPM 10' NEMA STANDARD 280 W 10 1 PMP-13 BOILER RM A111 DOMESTIC HOT WATER CIRC GRUNDFOS UP 15-42 B7 INLINE 6 GPM 6' NEMA STANDARD 85 W 10 1 PMP-14 BOILER RM A111 DOMESTIC WATER BOOSTER SYSTEM TIGERFLOW VMS-4000 TRIPLEX, VERTICAL INLINE 180 GPM 160' 87.5% 3 @ 5 HP 10 1 PMP-14A/14B/14C BOILER RM A111 DOMESTIC WATER DISTRIBUTION GRUNDFOS CR8-50 INTEGRATED IN PMP-14 TRIPLEX 42 GPM 224' 87.5% 5 HP 10 1 PMP-15 BOILER RM A111 FIRE PUMP FAIRBANKS MORSE VERTICAL INLINE 500 GPM 150' 89.5% 30 HP 10 1 PMP-16 BOILER RM A111 JOCKEY PUMP FAIRBANKS MORSE - 5 GPM 173' NEMA STANDARD 1 HP 10 1 PMP-17 ELEVATOR SUMP SUMP PUMP GRUNDFOS KP150 SUBMERSIBLE PUMP 32 GPM 6' NEMA STANDARD 1/4 HP 10 1 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) PMP-1 (2006) PMP-2 (2006) FAN ROOM B200 GLYCOL CIRC GRUNDFOS 2.5LM8 VERTICAL INLINE (REDUNDANT) 157 GPM 59' 85.5% 5 HP 10 6 PMP-3 (2006) PMP-4 (2006) FAN ROOM C300 GLYCOL CIRC GRUNDFOS 2.5LM9 VERTICAL INLINE (REDUNDANT) 157 GPM 59' 85.5% 5 HP 10 6 HX-1 FAN RM C300 WATER / GLYCOL HEAT EXCHANGER TRANTER GXD-042-L-5-KP-69 PLATE-AND-FRAME SURFACE AREA: 232.07 ft2 - - 24 20 HX-2 FAN RM B200 WATER / GLYCOL HEAT EXCHANGER TRANTER GXD-042-L-5-KP-51 PLATE-AND-FRAME SURFACE AREA: 232.07 ft3 - - 24 20 EF-1 ROOF RESTROOM / GENERAL EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 1125 CFM NEMA STANDARD 1/4 HP 25 16 EF-2 ROOF RESTROOM / GENERAL EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 1250 CFM NEMA STANDARD 1/4 HP 25 16 EF-3 ROOF RESTROOM / GENERAL EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 320 CFM NEMA STANDARD 1/4 HP 25 16 EF-4 ROOF LAB EXHAUST STROBIC AIR - CONST. VOL. DIRECT DRIVE 4500 CFM NEMA STANDARD 5 HP 20 11 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF-5 ROOF LAB EXHAUST STROBIC AIR - CONST. VOL. DIRECT DRIVE 2500 CFM NEMA STANDARD 3 HP 20 11 EF-6 ROOF ART ROOM EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 3200 CFM NEMA STANDARD 3/4 HP 25 16 EF-8A ROOF HOME EC RES HOOD EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 450 CFM NEMA STANDARD 1/4 HP 25 16 EF-8B ROOF HOME EC RES HOOD EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 600 CFM NEMA STANDARD 1/4 HP 25 16 EF-9 ROOF RESTROOM A107D EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 200 CFM NEMA STANDARD 1/6 HP 25 16 EF-10 ROOF EXHAUSTA105FA106G GREENHECK - CENTRIFUGALBELT DRIVE 160 CFM NEMA STANDARD 1/6 HP 25 16 EF-11 ROOF GENERAL RESTROOM EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 140 CFM NEMA STANDARD 1/6 HP 25 16 EF-12 KITCHEN HOOD KITCHEN HOOD (PACKAGED WITH MUA-1) GREENHECK - MAKE UP / EXHAUST AIR 5000 CFM NEMA STANDARD 3 HP 25 16 EF-13 ROOF TYPE II KITCHEN EXHAUST HOOD GREENHECK - CENTRIFUGALBELT DRIVE 700 CFM NEMA STANDARD 1/4 HP 25 16 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF-14 FAN ROOM B200 MENS LOCKER ROOM EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 3050 CFM FAST 2020 CFM SLOW NEMA STANDARD 1 HP 25 16 EF-15 FAN ROOM B200 WOMENS LOCKER ROOM EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 3050 CFM FAST 2020 CFM SLOW NEMA STANDARD 1 HP 25 16 EF-16 ROOF SKI B105 EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 150 CFM NEMA STANDARD 1/6 HP 20 11 EF-17 ROOF PAINT BOOTH EXHAUST GREENHECK - TUBE AXIAL FAN BELT DRIVE 5250 CFM NEMA STANDARD 3/4 HP 20 11 EF-18 ROOF TECH ROOM GEN EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 5300 CFM FAST 3500 CFM SLOW NEMA STANDARD 1.5 HP 20 11 EF-19 ROOF RESTROOM KITCHEN EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 80 CFM NEMA STANDARD 1/6 HP 20 11 EF-20 ROOF COOLING GREENHECK - CENTRIFUGALBELT DRIVE 1500 CFM NEMA STANDARD 1/4 HP 20 11 EF-21 ROOF LAB CABINET EXHAUST GREENHECK - CENTRIFUGALBELT DRIVE 100 CFM NEMA STANDARD 1/4 HP 20 11 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTORSIZE ASHRAESERVICELIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF-22 ROOF LIFE SKILLS RANGE HOOD EXHAUST GREENHECK - CENTRIFUGAL BELT DRIVE 150 CFM NEMA STANDARD 1/30 HP 20 11 EF-23 ROOF RESTROOM EXHAUST GREENHECK - CENTRIFUGAL BELT DRIVE 125 CFM NEMA STANDARD 1/6 HP 20 11 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Appendix D Energy Conservation Measures Houston High School Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 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: Main Office Improve Manual Switching $81 $100 11.90 1.2 2 Lighting: Corridor Custodian Add new Occupancy Sensor and Improve Manual Switching $62 $100 9.03 1.6 3 Lighting: Classroom Add new Occupancy Sensor and Improve Multi- Level Switch $3,383 $5,600 8.83 1.7 4 Lighting: Library Add new Occupancy Sensor $197 $400 7.20 2 5 Lighting: Corridor Add new Occupancy Sensor and Improve Manual Switching $2,497 $5,300 6.88 2.1 6 Lighting: Classroom Add new Occupancy Sensor $125 $290 6.27 2.3 7 Lighting: Staff Room Add new Occupancy Sensor $178 $450 5.77 2.5 8 Lighting: Library Add new Occupancy Sensor $74 $200 5.41 2.7 9 Lighting: Classroom Add new Occupancy Sensor $15 $50 4.33 3.4 10 Lighting: Corridor Improve Manual Switching $119 $500 3.48 4.2 11 Lighting: Gym Improve Manual Switching $334 $1,600 3.05 4.8 12 Lighting: Library Add new Occupancy Sensor $79 $400 2.89 5.1 13 Lighting: Office Add new Occupancy Sensor $37 $200 2.71 5.4 14 Lighting: Gym Low Use Add new Occupancy Sensor $74 $400 2.69 5.4 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 15 Lighting: Gym Moderate Use Add new Occupancy Sensor $74 $400 2.69 5.4 16 Lighting: Classroom Add new Occupancy Sensor $10 $60 2.41 6.1 17 Lighting: Locker Room Add new Occupancy Sensor $334 $2,400 2.04 7.2 18 Lighting: Corridor Replace with 2 FLUOR (4) T5 45.2" F54W/T5 HO Standard StdElectronic $166 $1,200 2.02 7.2 19 Lighting: Corridor Replace with 29 FLUOR (4) T5 45.2" F54W/T5 HO Standard StdElectronic $2,401 $17,400 2.02 7.2 20 Lighting: Library Student Government Add new Occupancy Sensor $21 $200 1.52 9.6 21 Lighting: Staff Room Add new Occupancy Sensor $15 $150 1.44 10.1 22 Lighting: Office Add new Occupancy Sensor $38 $400 1.40 10.4 23 Lighting: Cafeteria Replace with 33 FLUOR (4) T5 45.2" F54W/T5 HO Standard (2) StdElectronic $1,824 $19,800 1.35 10.9 24 Lighting: Storage Add new Occupancy Sensor $28 $300 1.34 10.9 25 Lighting: Gym Replace with 34 FLUOR (6) T5 45.2" F54W/T5 HO Standard (2) StdElectronic and Improve Occupancy Sensor $1,791 $21,400 1.22 11.9 26 Lighting: Exterior Parking Replace with 7 LED 150W Module StdElectronic $1,125 $14,000 1.17 12.4 27 Lighting: Exterior Parking Replace with 21 LED (2) 150W Module (2) StdElectronic $6,752 $84,000 1.17 12.4 28 Lighting: Gym Moderate Use Add new Occupancy Sensor $86 $1,200 1.05 14 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 29 Lighting: Custodian Office Add new Occupancy Sensor $11 $150 1.04 14.1 30 Air Tightening Perform air sealing to reduce air leakage by 20%. $1,479 $13,000 1.01 8.8 31 Lighting: Exterior Lighting Replace with 15 LED 50W Module StdElectronic $571 $9,000 0.93 15.8 32 Lighting: Exterior Lighting Replace with 6 LED 50W Module StdElectronic $228 $3,600 0.93 15.8 33 Ventilation Add 1 CO2 Sensor and associated programming to AHU-1 to reduce OSA and OSA schedule. Add/alter existing OSA dampers to provide finer OSA control. $582 $10,000 0.78 17.2 34 Lighting: Classroom Replace with 24 FLUOR (2) T8 4' F32T8 32W Standard (2) Program StdElectronic $179 $3,600 0.73 20.1 35 Lighting: Storage Add new Occupancy Sensor $7 $150 0.69 21.3 36 Lighting: Class Storage Add new Occupancy Sensor $5 $150 0.51 28.5 37 Lighting: Corridor Custodian Add new Occupancy Sensor $7 $200 0.49 30.1 38 Lighting: Gym Low Use Add new Occupancy Sensor $7 $200 0.49 30.1 39 HVAC And DHW Provide 2 Exhaust stack economizers, 1 for each boiler. Boilers are too large to combine into 1 economizer. $1,120 $42,000 0.43 37.5 40 Lighting: Classroom Replace with 462 FLUOR (2) T8 4' F32T8 32W Standard (2) Program StdElectronic $1,724 $69,300 0.36 40.2 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES Rank Feature Recommendation Annual Energy Savings Installed Cost SIR Payback (Years) 41 Lighting: Exterior Hockey Replace with 2 LED (2) 150W Module (2) StdElectronic $132 $8,000 0.24 60.6 42 Lighting: Exterior Hockey Replace with 4 LED (3) 150W Module (3) StdElectronic $396 $24,000 0.24 60.6 43 Lighting: Staff Restrooms Add new Occupancy Sensor $2 $150 0.21 68.1 TOTAL $28,370 $362,000 1.12 12.8 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS 1. Building Envelope Air Leakage Rank Location Estimated Air Leakage Recommended Air Leakage Target Installed Cost Annual Energy Savings 30 Air Tightness estimated as: 0.67 cfm/ft2 of above-grade shell area at 75 Pascals Perform air sealing to reduce air leakage by 20%. $13,000 $1,479 2. Mechanical Equipment Mechanical Rank Recommendation Installed Cost Annual Energy Savings 39 Provide 2 Exhaust stack economizers, 1 for each boiler. Boilers are too large to combine into 1 economizer. $42,000 $1,120 Ventilation Rank Recommendation Cost Annual Energy Savings 33 Add 1 CO2 Sensor and associated programming to AHU-1 to reduce OSA and OSA schedule. Add/alter existing OSA dampers to provide finer OSA control. $10,000 $582 3. Appliances and Lighting Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 1 Main Office FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Improve Manual Switching $100 $81 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 2 Corridor Custodian FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor and Improve Manual Switching $100 $62 3 Classroom 462 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Multi-Level Switch Add new Occupancy Sensor and Improve Multi- Level Switch $5,600 $3,383 4 Library 35 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $400 $197 5 Corridor 53 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor and Improve Manual Switching $5,300 $2,497 6 Classroom 24 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Multi-Level Switch Add new Occupancy Sensor $290 $125 7 Staff Room 24 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $450 $178 8 Library 20 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $200 $74 9 Classroom 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $50 $15 10 Corridor 5 FLUOR [Unknown Lamp] with Manual Switching Improve Manual Switching $500 $119 11 Gym 8 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching, Occupancy Sensor Improve Manual Switching $1,600 $334 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 12 Library 40 FLUOR T8 4' F32T8 32W Standard with Manual Switching Add new Occupancy Sensor $400 $79 13 Office 5 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching Add new Occupancy Sensor $200 $37 14 Gym Low Use 17 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $400 $74 15 Gym Moderate Use 17 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $400 $74 16 Classroom 5 FLUOR T8 4' F32T8 32W Standard with Manual Switching Add new Occupancy Sensor $60 $10 17 Locker Room 60 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $2,400 $334 18 Corridor 2 MH 400 Watt Magnetic with Manual Switching Replace with 2 FLUOR (4) T5 45.2" F54W/T5 HO Standard StdElectronic $1,200 $166 19 Corridor 29 MH 400 Watt Magnetic with Manual Switching Replace with 29 FLUOR (4) T5 45.2" F54W/T5 HO Standard StdElectronic $17,400 $2,401 20 Library Student Government 4 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Manual Dimmer Add new Occupancy Sensor $200 $21 21 Staff Room 4 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $15 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 22 Office 7 FLUOR (3) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $400 $38 23 Cafeteria 33 MH 400 Watt Magnetic with Manual Switching Replace with 33 FLUOR (4) T5 45.2" F54W/T5 HO Standard (2) StdElectronic $19,800 $1,824 24 Storage 4 FLUOR (4) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $300 $28 25 Gym 34 MH 400 Watt Magnetic with Manual Switching, Occupancy Sensor Replace with 34 FLUOR (6) T5 45.2" F54W/T5 HO Standard (2) StdElectronic and Improve Occupancy Sensor $21,400 $1,791 26 Exterior Parking 7 HPS 400 Watt Magnetic with Manual Switching Replace with 7 LED 150W Module StdElectronic $14,000 $1,125 27 Exterior Parking 21 HPS (2) 400 Watt (2) Magnetic with Manual Switching Replace with 21 LED (2) 150W Module (2) StdElectronic $84,000 $6,752 28 Gym Moderate Use 50 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Multi-Level Switch Add new Occupancy Sensor $1,200 $86 29 Custodian Office 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $11 31 Exterior Lighting 15 HPS 100 Watt Magnetic with Manual Switching Replace with 15 LED 50W Module StdElectronic $9,000 $571 32 Exterior Lighting 6 HPS 100 Watt Magnetic with Manual Switching Replace with 6 LED 50W Module StdElectronic $3,600 $228 34 Classroom 24 FLUOR (4) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Multi-Level Switch Replace with 24 FLUOR (2) T8 4' F32T8 32W Standard (2) Program StdElectronic $3,600 $179 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Lighting Fixtures and Controls Rank Location Existing Recommended Installed Cost Annual Energy Savings 35 Storage 2 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $7 36 Class Storage 3 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $5 37 Corridor Custodian 3 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $200 $7 38 Gym Low Use 3 FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $200 $7 40 Classroom 462 FLUOR (3) T8 4' F32T8 32W Standard (2) Program StdElectronic with Manual Switching, Multi-Level Switch Replace with 462 FLUOR (2) T8 4' F32T8 32W Standard (2) Program StdElectronic $69,300 $1,724 41 Exterior Hockey 2 HPS (2) 400 Watt (2) Magnetic with Manual Switching Replace with 2 LED (2) 150W Module (2) StdElectronic $8,000 $132 42 Exterior Hockey 4 HPS (3) 400 Watt (3) Magnetic with Manual Switching Replace with 4 LED (3) 150W Module (3) StdElectronic $24,000 $396 43 Staff Restrooms FLUOR (2) T8 4' F32T8 32W Standard Program StdElectronic with Manual Switching Add new Occupancy Sensor $150 $2 ------------------------------------------ AkWarmCalc Ver 2.1.4.2, Energy Lib 3/1/2012 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Appendix E Site Visit Photos Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 1. Main Entrance (South Face) 2. North Face and Loading Dock 3. North Entrance and Gym 4. Domestic Water Heaters WH-1 and WH-2 5. Boilers BLR-1 and BLR-2 6. Boiler Circulation Pumps Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 7. Heating Water Circulation Pumps 8. Domestic Cold Water System Pumps 9. Circulation Pump VFDs (Boiler Room) 10. AHU-3 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 11. AHU-4 12. AHU-5 13. AHU-1 14. AHU-2 Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 15. AHU-2 VFD 16. AHU-5 VFD 17. West Fan Rm HX-2 System 18. East Fan Rm HX-1 System Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Appendix F Thermographic Photos Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 Coffman Engineers made miscellaneous thermographic images of East High School using a FLIR T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate easy-to-identify heat losses. 1. Main Entrance, optical image. The shadow in the upper left is part of the infrared camera and is typical to all optical images in this section. 2. Main Entrance, infrared image. Heat loss through windows and doors is typical. 3. South Face, optical image. 4. South Face, infrared image. Heat loss through windows and doors is typical. 5. East Entrance, optical image. 6. East Entrance, infrared image. Heat loss through windows and doors is typical. Houston High School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02 7. East Face, optical image. 8. East Face, infrared image. Window losses are typical. Well insulated wall. 9. North face, optical image. 10. North face, infrared image. Heat losses through windows are typical. 11. Loading Dock, optical image. 12. Loading Dock, infrared images. Man doors show possible excessive air leakage. Windows and Overhead doors are showing typical heat losses. End of Report