CIRI-WOW-CAEC-02 Final Report - Alaska Energy Efficiency · ENERGY AUDIT FINAL REPORT Houston High...
Transcript of CIRI-WOW-CAEC-02 Final Report - Alaska Energy Efficiency · ENERGY AUDIT FINAL REPORT Houston High...
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: [email protected]
Matanuska-Susitna Borough School District Contact: Rick Jensen 501 N Gulkana Street Palmer, AK 99645 Email: [email protected]
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
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 High
Natural Gas Btus/CCF = 100,000
Provider Customer # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)
ENSTAR G232394 Jan-09 1/8/2009 2/9/2009 32 12,621 12,621 $12,714 $1.01
ENSTAR G232394 Feb-09 2/9/2009 3/10/2009 29 8,441 8,441 $8,525 $1.01
ENSTAR G232394 Mar-09 3/10/2009 4/8/2009 29 7,180 7,180 $7,260 $1.01
ENSTAR G232394 Apr-09 4/8/2009 5/11/2009 33 4,522 4,522 $4,595 $1.02
ENSTAR G232394 May-09 5/11/2009 6/10/2009 30 1,695 1,695 $1,762 $1.04
ENSTAR G232394 Jun-09 6/10/2009 7/9/2009 29 167 167 $231 $1.39
ENSTAR G232394 Jul-09 7/9/2009 8/7/2009 29 650 650 $716 $1.10
ENSTAR G232394 Aug-09 8/7/2009 9/10/2009 34 2,231 2,231 $2,302 $1.03
ENSTAR G232394 Sep-09 9/10/2009 10/8/2009 28 3,893 3,893 $3,970 $1.02
ENSTAR G232394 Oct-09 10/8/2009 11/9/2009 32 5,795 5,795 $5,877 $1.01
ENSTAR G232394 Nov-09 11/9/2009 12/9/2009 30 8,930 8,930 $9,021 $1.01
ENSTAR G232394 Dec-09 12/9/2009 1/8/2010 30 7,531 7,531 $6,295 $0.84
ENSTAR G232394 Jan-10 1/8/2010 2/8/2010 31 9,133 9,133 $7,620 $0.83
ENSTAR G232394 Feb-10 2/8/2010 3/8/2010 28 6,512 6,512 $5,451 $0.84
ENSTAR G232394 Mar-10 3/8/2010 4/7/2010 30 6,581 6,581 $5,562 $0.85
ENSTAR G232394 Apr-10 4/7/2010 5/5/2010 28 4,713 4,713 $4,002 $0.85
ENSTAR G232394 May-10 5/5/2010 6/7/2010 33 1,698 1,698 $1,485 $0.87
ENSTAR G232394 Jun-10 6/7/2010 7/6/2010 29 463 463 $454 $0.98ENSTAR G232394 Jun-10 6/7/2010 7/6/2010 29 463 463 $454 $0.98
ENSTAR G232394 Jul-10 7/6/2010 8/4/2010 29 251 251 $562 $2.24
ENSTAR G232394 Aug-10 8/4/2010 9/2/2010 29 1,664 1,664 $1,692 $1.02
ENSTAR G232394 Sep-10 9/2/2010 10/5/2010 33 4,106 4,106 $3,646 $0.89
ENSTAR G232394 Oct-10 10/5/2010 11/3/2010 29 6,473 6,473 $5,539 $0.86
ENSTAR G232394 Nov-10 11/3/2010 12/7/2010 34 10,289 10,289 $8,592 $0.84
ENSTAR G232394 Dec-10 12/7/2010 1/12/2011 36 11,556 11,556 $9,750 $0.84
Jan - 09 to Dec - 09 total: 63,654 63,654 0 $63,267 $0
Jan - 10 to Dec - 10 total: 63,437 63,437 0 $54,356 $0
$0.99
$0.86
Jan - 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
4,000
6,000
8,000
10,000
12,000
14,000
Na
tura
l G
as
Co
st (
$)
Na
tura
l G
as
Co
nsu
mp
tio
n (
Th
erm
s)
Houston High - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)
Natural Gas Consumption
(Therms)
Natural Gas Cost ($)
$0
$2,000
$4,000
0
2,000
4,000
Date (Mon - Yr)
Houston High School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI-WOW-CAEC-02
Houston High
Electricity Btus/kWh = 3,413
Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)
MEA E13002 Jan-09 12/28/2008 1/27/2009 30 87,040 2,971 280 $13,226 $0.15
MEA E13002 Feb-09 1/27/2009 2/26/2009 30 79,120 2,700 278 $12,141 $0.15
MEA E13002 Mar-09 2/26/2009 3/25/2009 27 63,600 2,171 296 $10,125 $0.16
MEA E13002 Apr-09 3/25/2009 4/27/2009 33 75,760 2,586 244 $10,546 $0.14
MEA E13002 May-09 4/27/2009 5/27/2009 30 62,400 2,130 244 $8,900 $0.14
MEA E13002 Jun-09 5/27/2009 6/28/2009 32 24,320 830 154 $3,767 $0.15
MEA E13002 Jul-09 6/28/2009 7/28/2009 30 21,920 748 118 $3,135 $0.14
MEA E13002 Aug-09 7/28/2009 8/26/2009 29 51,440 1,756 256 $7,237 $0.14
MEA E13002 Sep-09 8/26/2009 9/27/2009 32 74,240 2,534 274 $9,968 $0.13
MEA E13002 Oct-09 9/27/2009 10/27/2009 30 72,320 2,468 292 $9,445 $0.13
MEA E13002 Nov-09 10/27/2009 11/28/2009 32 84,000 2,867 260 $10,572 $0.13
MEA E13002 Dec-09 11/28/2009 12/26/2009 28 73,360 2,504 295 $9,569 $0.13
MEA E13002 Jan-10 12/26/2009 1/26/2010 31 68,960 2,354 284 $8,383 $0.12
MEA E13002 Feb-10 1/26/2010 2/22/2010 27 67,520 2,304 248 $8,056 $0.12
MEA E13002 Mar-10 2/22/2010 3/28/2010 34 87,040 2,971 286 $10,209 $0.12
MEA E13002 Apr-10 3/28/2010 4/27/2010 30 76,320 2,605 234 $8,230 $0.11
MEA E13002 May-10 4/27/2010 5/25/2010 28 62,960 2,149 233 $6,982 $0.11
MEA E13002 Jun-10 5/25/2010 6/27/2010 33 34,080 1,163 103 $3,670 $0.11MEA E13002 Jun-10 5/25/2010 6/27/2010 33 34,080 1,163 103 $3,670 $0.11
MEA E13002 Jul-10 6/27/2010 7/27/2010 30 26,480 904 73 $2,834 $0.11
MEA E13002 Aug-10 7/27/2010 8/28/2010 32 60,320 2,059 228 $6,775 $0.11
MEA E13002 Sep-10 8/28/2010 9/27/2010 30 73,840 2,520 268 $8,222 $0.11
MEA E13002 Oct-10 9/27/2010 10/26/2010 29 80,720 2,755 249 $9,080 $0.11
MEA E13002 Nov-10 10/26/2010 11/28/2010 33 79,680 2,719 253 $9,001 $0.11
MEA E13002 Dec-10 11/28/2010 12/28/2010 30 72,400 2,471 256 $8,322 $0.11
Jan - 09 to Dec - 09 total: 769,520 26,264 2,991 $108,631 $0
Jan - 10 to Dec - 10 total: 790,320 26,974 2,714 $89,764 $0
$0.14
$0.11
Jan - 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
$14,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
Ele
ctri
c C
ost
($
)
Ele
ctri
c C
on
sum
pti
on
(k
Wh
)
Houston High - Electric Consumption (kWh) vs. Electric Cost ($)
Electric Consumption (kWh)
Electric Cost ($)
$0
$2,000
$4,000
0
10,000
20,000
Date (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
$200,000
Existing Retrofit
Ventilation and FansSpace HeatingOther ElectricalLightingDomestic Hot Water
Annual 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 MOTOR
SIZE
ASHRAESERVICE
LIFE (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 MOTOR
SIZE
ASHRAESERVICE
LIFE (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 MOTOR
SIZE
ASHRAESERVICE
LIFE (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 MOTOR
SIZE
ASHRAESERVICE
LIFE (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 - CENTRIFUGAL
BELT DRIVE 1125 CFM
NEMA STANDARD
1/4 HP 25 16
EF-2 ROOF RESTROOM /
GENERAL EXHAUST
GREENHECK - CENTRIFUGAL
BELT DRIVE 1250 CFM
NEMA STANDARD
1/4 HP 25 16
EF-3 ROOF RESTROOM /
GENERAL EXHAUST
GREENHECK - CENTRIFUGAL
BELT 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 MOTOR
SIZE
ASHRAESERVICE
LIFE (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 - CENTRIFUGAL
BELT DRIVE 3200 CFM
NEMA STANDARD
3/4 HP 25 16
EF-8A ROOF HOME EC RES
HOOD EXHAUST
GREENHECK - CENTRIFUGAL
BELT DRIVE 450 CFM
NEMA STANDARD
1/4 HP 25 16
EF-8B ROOF HOME EC RES
HOOD EXHAUST
GREENHECK - CENTRIFUGAL
BELT DRIVE 600 CFM
NEMA STANDARD
1/4 HP 25 16
EF-9 ROOF RESTROOM
A107D EXHAUST
GREENHECK - CENTRIFUGAL
BELT DRIVE 200 CFM
NEMA STANDARD
1/6 HP 25 16
EF-10 ROOF EXHAUSTA105
FA106G GREENHECK -
CENTRIFUGALBELT DRIVE
160 CFM NEMA
STANDARD 1/6 HP 25 16
EF-11 ROOF GENERAL
RESTROOM EXHAUST
GREENHECK - CENTRIFUGAL
BELT 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 - CENTRIFUGAL
BELT 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 MOTOR
SIZE
ASHRAESERVICE
LIFE (YEARS)
ESTIMATED REMAINING
USEFUL LIFE
(YEARS)
EF-14 FAN ROOM
B200
MENS LOCKER ROOM
EXHAUST
GREENHECK - CENTRIFUGAL
BELT DRIVE
3050 CFM FAST
2020 CFM SLOW
NEMA STANDARD
1 HP 25 16
EF-15 FAN ROOM
B200
WOMENS LOCKER ROOM
EXHAUST
GREENHECK - CENTRIFUGAL
BELT DRIVE
3050 CFM FAST
2020 CFM SLOW
NEMA STANDARD
1 HP 25 16
EF-16 ROOF SKI
B105 EXHAUST
GREENHECK - CENTRIFUGAL
BELT 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 - CENTRIFUGAL
BELT DRIVE 80 CFM
NEMA STANDARD
1/6 HP 20 11
EF-20 ROOF COOLING GREENHECK - CENTRIFUGAL
BELT 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 MOTOR
SIZE
ASHRAESERVICE
LIFE (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