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Home My WebLink AboutKAL Kaltag School 2012-EEManaging Office 2400 College Road 3105 Lakeshore Dr. Suite 106A 4402 Thane Road Fairbanks, Alaska 99709 Anchorage, Alaska 99517 Juneau, Alaska 99801 p. 907.452.5688 p. 907.222.2445 p: 907.586.6813 f. 907.452.5694 f. 907.222.0915 f: 907.586.6819 www.nortechengr.com ENERGY AUDIT – FINAL REPORT KALTAG SCHOOL Kaltag, Alaska Prepared for: Ms. Kerry Boyd 4762 Old Airport Way Fairbanks, Alaska Prepared by: David C. Lanning PE, CEA Doug Dusek CEA Steven Billa EIT, CEAIT July 20, 2012 Acknowledgment: "This material is based upon work supported by the Department of Energy under Award Number DE-EE0000095.” ENVIRONMENTAL ENGINEERING, HEALTH & SAFETY Anch: 3105 Lakeshore Dr. Ste 106A, 99517 907.222.2445 Fax: 222.0915 Fairbanks: 2400 College Road, 99709 907.452.5688 Fax: 452.5694 Juneau: 4402 Thane Road, 99801 907.586.6813 Fax: 586.6819 info@nortechengr.com www.nortechengr.com F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx i TABLE OF CONTENTS 1.0 EXECUTIVE SUMMARY .................................................................................................. 1 2.0 INTRODUCTION ............................................................................................................... 4 2.1 Building Use .......................................................................................................... 4 2.2 Building Occupancy and Schedules ...................................................................... 4 2.3 Building Description ............................................................................................... 4 3.0 BENCHMARKING 2010 UTILITY DATA .......................................................................... 7 3.1 Total Energy Use and Cost of 2010 ...................................................................... 8 3.2 Energy Utilization Index of 2010 ............................................................................ 9 3.3 Cost Utilization Index of 2010 .............................................................................. 10 3.4 Seasonal Energy Use Patterns ........................................................................... 11 3.5 FUTURE ENERGY MONITORING ................................................................................. 12 4.0 MODELING ENERGY CONSUMPTION ......................................................................... 13 4.1 Understanding How AkWarm Models Energy Consumption ............................... 14 4.2 AkWarm Calculated Savings for the Kaltag School............................................. 15 4.3 Additional Modeling Methods .............................................................................. 16 5.0 BUILDING OPERATION AND MAINTENANCE (O & M) .............................................. 17 5.1 Operations and Maintenance .............................................................................. 17 5.2 Commissioning .................................................................................................... 17 5.3 Building Specific Recommendations ................................................................... 18 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx ii APPENDICES Appendix A Recommended Energy Efficiency Measures ........................................... 20 Appendix B Energy Efficiency Measures that are NOT Recommended ..................... 25 Appendix C Significant Equipment List ....................................................................... 27 Appendix D Local Utility Rate Structure ...................................................................... 29 Appendix E Analysis Methodology .............................................................................. 31 Appendix F Audit Limitations ...................................................................................... 32 Appendix G References .............................................................................................. 33 Appendix H Typical Energy Use and Cost – Fairbanks and Anchorage ..................... 34 Appendix I Typical Energy Use and Cost – Continental U.S. .................................... 35 Appendix J List of Conversion Factors and Energy Units .......................................... 36 Appendix K List of Acronyms, Abbreviations, and Definitions ..... Error! Bookmark not defined. Appendix L Building Floor Plan .................................................................................. 38 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 1 1.0 EXECUTIVE SUMMARY NORTECH has completed an ASHRAE Level II Energy Audit of the Kaltag School, 15,248 square foot facility in the Yukon Koyukuk School District. The audit began with benchmarking which resulted in a calculation of the energy consumption per square foot. A site inspection was completed on February 16, 2012 to obtain information about the lighting, heating, ventilation, cooling and other building energy uses. The existing usage data and current systems were then used to develop a building energy consumption model using AkWarm. Once the model was calibrated, a number of Energy Efficiency Measures (EEMs) were developed from review of the data and observations. EEMs were evaluated and ranked on the basis of both energy savings and cost using a Savings/Investment Ratio (SIR). While these modeling techniques were successful in verifying that many of the EEMs would save energy, not all of the identified EEMs were considered cost effective based on the hardware, installation, and energy costs at the time of this audit. While the need for a major retrofit can typically be identified by an energy audit, upgrading specific systems often requires collecting additional data and engineering and design efforts that are beyond the scope of the Level II energy audit. The necessity and amount of design effort and cost will vary depending on the scope of the specific EEMs planned and the sophistication and capability of the entire design team, including the building owners and operators. During the budgeting process for any major retrofit identified in this report, the building owner should add administrative and supplemental design costs to cover the individual needs of their own organization and the overall retrofit project. The recommended EEMs for the Kaltag School are summarized in the table below. Additional discussion of the modeling process can be found in Section 3. Details of each individual EEM can be found in Appendix A of this report. A summary of EEMs that were evaluated but are not currently recommended is located in Appendix B. PRIORITY LIST – ENERGY EFFICIENCY MEASURES (EEMs) Rank Feature/ Location Improvement Description Estimated Annual Energy Savings Estimated Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 1 Setback Thermostat: School Fix heating controls to keep building Temperature Setpoint at 68.0 deg F during Occupied times, and Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the School space. $12,297 $6,000 31 0.48 2 HVAC And DHW Install Vent Dampers on chimney connectors $1,330 $3,750 4.8 2.8 3 Lighting: Kaltag School Replace 32 watt T8s with 25 watt T8s, Replace various wattage incandescent lamps with CFLs, Replace exterior HID lamps with LEDs $4,550 $16,086 2.2 3.5 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 2 PRIORITY LIST – ENERGY EFFICIENCY MEASURES (EEMs) Rank Feature/ Location Improvement Description Estimated Annual Energy Savings Estimated Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) TOTAL, cost-effective measures $18,439 $25,836 8.2 1.4 About thirty percent of these savings (or $6,000) is based on turning down the temperature in the school from 73 degrees F to 68 degrees F. If the normal condition in the school is not the 73 degrees F that we found during the audit, this $6,000 savings may not be achievable. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 3 Modeled Building Energy Cost Breakdown The above charts are a graphical representation of the modeled energy usage for Kaltag School. The greatest portions of energy cost for the building is lighting and envelope air losses. Detailed improvements can be found in Appendix A. The energy cost by end use breakdown was provided by AkWarm based on the field inspection and does not indicate that all individual fixtures and appliances were directly measured. The current energy costs are shown above on the left hand pie graph and the projected energy costs, assuming use of the recommended EEMs, are shown on the right. The chart breaks down energy usage by cost into the following categories:  Envelope Air Losses—the cost to provide heated fresh air to occupants, air leakage, heat lost in air through the chimneys and exhaust fans, heat lost to wind and other similar losses.  Envelope o Ceiling—quantified heat loss transferred through the ceiling portion of the envelope. o Window—quantified heat loss through the window portion of the envelope. o Wall/Door—quantified heat loss through the wall and door portions of the envelope. o Floor—quantified heat loss through the floor portion of the envelope.  Water Heating—energy cost to provide domestic hot water.  Fans—energy cost to run ventilation, and exhaust fans.  Lighting—energy cost to light the building.  Refrigeration—energy costs to provide refrigerated goods for the occupants.  Other Electrical—includes energy costs not listed above including cooking loads, laundry loads, other plug loads and electronics. Envelope Air Losses $33,179 33% Ceiling $5,861 6%Window $8,941 9% Wall/Door $7,252 7% Floor $7,649 7% Water Heating $3,196 3% Fans $9,724 10% Lighting $19,934 20% Refrigeration $2,856 3% Other Electrical $2,429 2%Cooking $73 0% Existing Building Energy Cost Breakdown $ 101,094 Envelope Air Losses $26,716 26% Ceiling $4,858 5% Window $5,397 5% Wall/Door $5,847 6% Floor $6,297 6% Water Heating $4,101 4% Fans $9,724 10% Lighting $14,619 14% Refrigeration $2,856 3% Other Electrical $2,429 2% Cooking $73 0% 73° - 68° Savings $6,000 6% Other Savings $12,177 12% Retrofit Building Energy Cost Breakdown $ 82,917 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 4 2.0 INTRODUCTION NORTECH contracted with The Alaska Housing Finance Corporation to perform ASHRAE Level II Energy Audits for publically owned buildings in Alaska. This report presents the findings of the utility benchmarking, modeling analysis, and the recommended building modifications, and building use changes that are expected to save energy and money. The report is organized into sections covering:  description of the facility,  the building’s historic energy usage (benchmarking),  estimating energy use through energy use modeling,  evaluation of potential energy efficiency or efficiency improvements, and  recommendations for energy efficiency with estimates of the costs and savings. 2.1 Building Use Kaltag School provides Pre-School through 12th grade education in Kaltag, Alaska. The school is composed of classrooms, offices, and a gymnasium. 2.2 Building Occupancy and Schedules Kaltag School has an average of 29 students and 10 faculty members. The facility operates during the regular school year, which takes place from the middle of August to the end of May. The building is used from 7:00 am to 7:00 pm Monday through Friday. 2.3 Building Description Kaltag School is a one-story wood framed building on pilings; built in 1980. A new 240 square foot Boiler Building is located directly north of the school which is included in the square footages and calculations for this report. Building Envelope Building Envelope: Walls Wall Type Description Insulation Notes School Above Grade Walls Wood-framed with 2x8 studs spaced 16-inches on center. R-25 fiberglass batt. No signs of insulation damage. Boiler Building Above Grade Walls Wood-framed with 2x8 studs spaced 16-inches on center. R-25 fiberglass batt. No signs of insulation damage. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 5 Heating and Ventilation Systems Heat in Kaltag School is provided by five oil fired boilers, located in the separate Boiler Building. Circulation pumps distribute the heat throughout the building to:  Baseboard heaters in the classrooms  Heating coils in air handling units (AHUs)  Cabinet heaters in entry ways Heat is controlled by 9 manual thermostats located throughout the school. Within Kaltag School, there are five air handling units (AHUs):  AHU-1 provides ventilation and heat to the east classrooms.  AHU-2 provides ventilation and heat to the east side of the gym  AHU-3 provides ventilation and heat to the west side of the gym Building Envelope: Floors Floor Type Description Insulation Notes School Floor Exposed Wood-framed floor joist, spaced 16 inch on center R-25 fiberglass batt - Boiler Building Floor Slab on Grade: Concrete None - Building Envelope: Roof Roof Type Description Insulation Notes School Roof Cold roofs framed with wood trusses. 10-inches of fiberglass batt. Batts are disturbed in some areas and should be re-laid Boiler Building Roof Cathedral style roof, Wood- framed with 2x6 joists R-25 fiberglass batt - Building Envelope: Doors and Windows Door and Window Type Description Estimated R-Value Notes All Doors Wood: Solid Core: ½ lite glass 3.7 73 sq ft Window Type 1 Vinyl Frame: Triple Pane Glass 2.6 98 sq ft Window Type 2 Vinyl Frame: Double Pane Glass 2.0 5 sq ft Window Type 3 Wood Frame: Single Pane with Storm Glass 1.8 83 sq ft Window Type 4 Wood Frame: Double Pane 1.8 56 sq ft Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 6  AHU-4 provides ventilation and heat to the west classrooms  AHU-5 provides ventilation and heat to the office area Air Conditioning System There is no air conditioning system installed in this building. Energy Management Energy Management equipment is installed in the Boiler Room to modulate boilers and control outside combustion air. However, neither system was operating during the audit. AHUs are controlled by a Direct Digital Controller (DDC) system and do not operate during unoccupied times. Lighting Systems Lighting in this school is provided by ceiling mounted fluorescent fixtures with T8 lamps (1-inch diameter, 4-foot long). Lighting in the gym consisted of high bay style fixtures with T5 lamps (5/8-inch diameter, 4-foot long). A small amount of various sized incandescent lamps were found scattered throughout the school. All of the lighting with exception of the gymnasium lighting is on occupancy sensors. Domestic Hot Water Domestic hot water is provided by an indirect hot water heater with a 119 gallon storage capacity. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 7 3.0 BENCHMARKING 2010 UTILITY DATA Benchmarking building energy use consists of obtaining and then analyzing two years of energy bills. The original utility bills are necessary to determine the raw usage, and charges as well as to evaluate the utility’s rate structure. The metered usage of electrical and natural gas consumption is measured monthly, but heating oil, propane, wood, and other energy sources are normally billed upon delivery and provide similar information. During benchmarking, information is compiled in a way that standardizes the units of energy and creates energy use and billing rate information statistics for the building on a square foot basis. The objectives of benchmarking are:  to understand patterns of use,  to understand building operational characteristics,  for comparison with other similar facilities in Alaska and across the country, and  to offer insight in to potential energy savings. The results of the benchmarking, including the energy use statistics and comparisons to other areas, are discussed in the following sections. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 8 3.1 Total Energy Use and Cost of 2010 The energy use profiles below show the energy and cost breakdowns for the Kaltag School. The total 2010 energy use for the building was 2,372 mmBTU and the total cost was $103,756. These charts show the portion of use for a fuel type and the portion of its cost. The above charts indicate that the highest portion of energy use is for oil and the highest portion of cost is for electric. Fuel oil consumption correlates directly to space heating and domestic hot water while electrical use can correlate to lighting systems, plug loads, and HVAC equipment. The energy type with the highest cost often provides the most opportunity for savings. Electric 510 22% Oil 1,862 78% Energy Use Total (mmBTU) Electric $62,490 60% Oil $41,265 40% Energy Cost Total ($) Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 9 3.2 Energy Utilization Index of 2010 The primary benchmarking statistic is the Energy Utilization Index (EUI). The EUI is calculated from the utility bills and provides a snapshot of the quantity of energy actually used by the building on a square foot and annual basis. The calculation converts the total energy use for the year from all sources in the building, such as heating fuel and electrical usage, into British Thermal Units (BTUs). This total annual usage is then divided by the number of square feet of the building. The EUI units are BTUs per square foot per year. The benchmark analysis found that the Kaltag School has an EUI of 156,000 BTUs per square foot per year. The EUI is useful in comparing this building’s energy use to that of other similar buildings in Alaska and in the Continental United States. The EUI can be compared to average energy use in 2003 found in a study by the U.S. Energy Information Administration of commercial buildings (abbreviated CBECS, 2006). That report found an overall average energy use of about 90,000 BTUs per square foot per year while studying about 6,000 commercial buildings of all sizes, types, and uses that were located all over the Continental U.S. (see Table C3 in Appendix I). In a recent and unpublished state-wide benchmarking study sponsored by the Alaska Housing Finance Corporation, schools in Fairbanks averaged 62,000 BTUs per square foot and schools in Anchorage averaged 123,000 BTUs per square foot annual energy use. The chart below shows the Kaltag School relative to these values. These findings are discussed further in Appendix H. 155,000 62,000 123,000 0 20000 40000 60000 80000 100000 120000 140000 160000 180000 Btu/ Sq. FtAnnual Energy Use Index (Total Energy/ SF) Kaltag School Fairbanks Schools Anchorage Schools Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 10 3.3 Cost Utilization Index of 2010 Another useful benchmarking statistic is the Cost Utilization Index (CUI), which is the cost for energy used in the building on a square foot basis per year. The CUI is calculated from the cost for utilities for a year period. The CUI permits comparison of buildings on total energy cost even though they may be located in areas with differing energy costs and differing heating and/or cooling climates. The cost of energy, including heating oil, natural gas, and electricity, can vary greatly over time and geographic location and can be higher in Alaska than other parts of the country. The CUI for Kaltag School is about $6.80/SF. This is based on utility costs from 2010 and the following rates: Electricity at $ 0.42 / kWh ($ 12.31 / Therm) # 1 Fuel Oil at $ 2.97 / gallon ($ 2.22 / Therm) The Department of Energy Administration study, mentioned in the previous section (CBECS, 2006) found an average cost of $2.52 per square foot in 2003 for 4,400 buildings in the Continental U.S (Tables C4 and C13 of CBDES, 2006). Schools in Fairbanks have an average cost for energy of $2.42 per square foot while Anchorage schools average $2.11 per square foot. The chart below shows the Kaltag School relative to these values. More details are included in Appendix H. $6.80 $2.42 $2.11 $0.00 $1.00 $2.00 $3.00 $4.00 $5.00 $6.00 $7.00 $8.00 $/Sq. FtAnnual Energy Cost Index (Total Cost/ SF) Kaltag School Fairbanks Schools Anchorage Schools Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 11 3.4 Seasonal Energy Use Patterns Energy consumption is often highly correlated with seasonal climate and usage variations. The graphs below show the electric and fuel consumption of this building over the course of two years. The lowest monthly use is called the baseline use. The electric baseline often reflects year round lighting consumption while the heating fuel baseline often reflects year round hot water usage. The clear relation of increased energy usage during periods of cold weather can be seen in the months with higher usage. Note: Estimated fuel oil use by the AkWarm model for 2010 is 13,894 gallons. Estimated fuel oil use based on run time hour meters placed on boilers during the audit along with respective Kaltag Heating Degree Day (HDD) data is 14,767 gallons. There is a significant difference between the amount of fuel oil delivered and these estimates. 0 5000 10000 15000 20000 25000 Jul-09Sep-09Nov-09Jan-10Mar-10May-10Jul-10Sep-10Nov-10Jan-11Mar-11May-11KWHElectrical Consumption 0 5,000 10,000 15,000 20,000 25,000 30,000 Jan-09Mar-09May-09Jul-09Sep-09Nov-09Jan-10Mar-10May-10Jul-10Sep-10Nov-10Jan-11Mar-11May-11GallonsFuel Oil Deliveries 0 1,000 2,000 3,000 Jan-09Mar-09May-09Jul-09Sep-09Nov-09Jan-10Mar-10May-10Jul-10Sep-10Nov-10Jan-11Mar-11May-11GallonsAkWarm Estimated Oil Consumption for 2010 AkWarm Modeled Oil Use Estimated Oil Use from Hour Meters Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 12 3.5 FUTURE ENERGY MONITORING Energy accounting is the process of tracking energy consumption and costs. It is important for the building owner or manager to monitor and record both the energy usage and cost each month. Comparing trends over time can assist in pinpointing major sources of energy usage and aid in finding effective energy efficiency measures. There are two basic methods of energy accounting: manual and automatic. Manual tracking of energy usage may already be performed by an administrative assistant, however if the records are not scrutinized for energy use, then the data is merely a financial accounting. Digital energy tracking systems can be installed. They display and record real-time energy usage and accumulated energy use and cost. There are several types which have all of the information accessible via Ethernet browser. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 13 4.0 MODELING ENERGY CONSUMPTION After benchmarking of a building is complete and the site visit has identified the specific systems in the building, a number of different methods are available for quantifying the overall energy consumption and to model the energy use. These range from relatively simple spreadsheets to commercially available modeling software capable of handling complex building systems. NORTECH has used several of these programs and uses the worksheets and software that best matches the complexity of the building and specific energy use that is being evaluated. Modeling of an energy efficiency measure (EEM) requires an estimate of the current energy used by the specific feature, the estimated energy use of the proposed EEM and its installed cost. EEMs can range from a single simple upgrade, such as light bulb type or type of motor, to reprogramming of the controls on more complex systems. While the need for a major retrofit can typically be identified by an energy audit, the specific system upgrades often require collecting additional data and engineering and design efforts that are beyond the scope of the Level II energy audit. Based on the field inspection results and discussions with the building owners/operators, auditors developed potential EEMs for the facility. Common EEMs that could apply to almost every older building include:  Reduce the envelope heat losses through: o increased building insulation, and o better windows and doors  Reduce temperature difference between inside and outside using setback thermostats  Upgrade inefficient: o lights, o motors, o refrigeration units, and o other appliances  Reduce running time of lights/appliances through: o motion sensors, o on/off timers, o light sensors, and o other automatic/programmable systems The objective of the following sections is to describe how the overall energy use of the building was modeled and the potential for energy savings. The specific EEMs that provide these overall energy savings are detailed in Appendix A of this report. While the energy savings of an EEM is unlikely to change significantly over time, the cost savings of an EEM is highly dependent on the current energy price and can vary significantly over time. An EEM that is not currently recommended based on price may be more attractive at a later date or with higher energy prices. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 14 4.1 Understanding How AkWarm Models Energy Consumption NORTECH used the AkWarm model for evaluating the overall energy consumption at Kaltag School. The AkWarm program was developed by the Alaska Housing Finance Corporation (AHFC) to model residential energy use. The original AkWarm is the modeling engine behind the successful residential energy upgrade program that AHFC has operated for a number of years. In the past few years, AHFC has developed a version of this model for commercial buildings. Energy use in buildings is modeled by calculating energy losses and consumption, such as:  Heat lost through the building envelope components, including windows, doors, walls, ceilings, crawlspaces, and foundations. These heat losses are computed for each component based on the area, heat resistance (R-value), and the difference between the inside temperature and the outside temperature. AkWarm has a library of temperature profiles for villages and cities in Alaska.  Window orientation, such as the fact that south facing windows can add heat in the winter but north-facing windows do not.  Inefficiencies of the heating system, including the imperfect conversion of fuel oil or natural gas due to heat loss in exhaust gases, incomplete combustion, excess air, etc. Some electricity is also consumed in moving the heat around a building through pumping.  Inefficiencies of the cooling system, if one exists, due to various imperfections in a mechanical system and the required energy to move the heat around.  Lighting requirements and inefficiencies in the conversion of electricity to light; ultimately all of the power used for lighting is converted to heat. While the heat may be useful in the winter, it often isn’t useful in the summer when cooling may be required to remove the excess heat. Lights are modeled by wattage and operational hours.  Use and inefficiencies in refrigeration, compressor cooling, and heat pumps. Some units are more efficient than others. Electricity is required to move the heat from inside a compartment to outside it. Again, this is a function of the R-Value and the temperature difference between the inside and outside of the unit.  Plug loads such as computers, printers, mini-fridges, microwaves, portable heaters, monitors, etc. These can be a significant part of the overall electricity consumption of the building, as well as contributing to heat production.  The schedule of operation for lights, plug loads, motors, etc is a critical component of how much energy is used. AkWarm adds up these heat losses and the internal heat gains based on individual unit usage schedules. These estimated heat and electrical usages are compared to actual use on both a yearly and seasonal basis. If the AkWarm model is within 5 % to 10% of the most recent 12 months usage identified during benchmarking, the model is considered accurate enough to make predictions of energy savings for possible EEMs. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 15 4.2 AkWarm Calculated Savings for the Kaltag School Based on the field inspection results and discussions with the building owners/operators, auditors developed potential EEMs for the facility. These EEMs are then entered into AkWarm to determine if the EEM saves energy and is cost effective (i.e. will pay for itself). AkWarm calculates the energy and money saved by each EEM and calculates the length of time for the savings in reduced energy consumption to pay for the installation of the EEM. AkWarm makes recommendations based on the Savings/Investment Ratio (SIR), which is defined as ratio of the savings generated over the life of the EEM divided by the installed cost. Higher SIR values are better and any SIR above one is considered acceptable. If the SIR of an EEM is below one, the energy savings will not pay for the cost of the EEM and the EEM is not recommended. Preferred EEMs are listed by AkWarm in order of the highest SIR. A summary of the savings from the recommended EEMs are listed in this table. Description Space Heating (1)(2) Water Heating (1) Lighting (1) Refrigeration Other Electrical Cooking Ventilation Fans Total Existing Building $62,882 $3,196 $19,934 $2,856 $2,429 $73 $9,724 $101,094 With All Proposed Retrofits $49,115 $4,101 $14,619 $2,856 $2,429 $73 $9,724 $82,917 Savings $13,767 -$905 $5,315 $0 $0 $0 $0 $18,177 1) Savings in these categories represent the overall savings for the building, and reflect any added cost that might occur because of a retrofit. For example, installing more efficient lights will increase the heating load and creating or lowering an unoccupied setback temperature will increase hot water heat losses and cost. 2) With heating set points and envelope components gathered during the visit, AkWarm models the building to only use 13,894 gallons of fuel per year. However, from field testing it was estimated that the building might use around 14,797 gallons of fuel oil per year. These are both estimates of fuel use over a year. Savings associated with making HVAC retrofits is achievable but may be lower if Kaltag School actually uses less heating fuel than modeled. Savings associated with making these retrofits is based on the 2010 price of fuel oil. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 16 4.3 Additional Modeling Methods The AkWarm program effectively models wood-framed and other buildings with standard heating systems and relatively simple HVAC systems. AkWarm models of more complicated mechanical systems are sometimes poor due to a number of simplifying assumptions and limited input of some variables. Furthermore, AKWarm is unable to model complex HVAC systems such as variable frequency motors, variable air volume (VAV) systems, those with significant digital or pneumatic controls or significant heat recovery capacity. In addition, some other building methods and occupancies are outside AkWarm capabilities. This report section is included in order to identify benefits from modifications to those more complex systems or changes in occupant behavior that cannot be addressed in AkWarm. Inconsistent utility data prevented normal calibration of the AkWarm model. Therefore, the model was based on the best input data available; experience calibrating many other buildings facility data indicates that the energy consumption results and EEM savings are reasonable. One retrofit that could not be modeled in AkWarm is the repair of the heating controls in the building. During the visit, many thermostats were all set to the “off” position while the actual building temperature was about 73 degrees F. This difference between set point and operating point could possibly be caused by:  Bad positioning of the thermostats (some thermostats are installed directly above baseboard heaters)  Malfunctioning thermostats  Broken valves causing them to be stuck open  Other unknowns If windows in the building are left open during cold winter days, this would make the zone call for more heat, which eventually leads other rooms on that zone to be warmer. To estimate the SIR of repairing this control problem, two AkWarm models were created:  AkWarm with 73 degrees F as building space temperature setpoint.  AkWarm with 68 degrees F building space temperature setpoint and a complete setback thermostat retrofit to 60 degrees F for unoccupied times. The estimated cost for heating the building at 73 degrees F in AkWarm is $62,882 while the estimated cost for heating the building at 68 degrees F is $56,755, a difference of $6,127. The estimated savings associated with setting back the building unoccupied setpoint to 60 degrees F is $6,171 and when added to the heating setpoint savings, the associated savings from installing new setback thermostats is $12,297. The estimated cost for removing existing 9 thermostats and replacing them with 9 electronic setback thermostats along with replacing all corresponding zone valves is $6,000. The SIR for this retrofit is 31 with a simple payback of 0.5 year. Keeping the building at a desired temperature set point will allow for better building comfort and will save energy. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 17 5.0 BUILDING OPERATION AND MAINTENANCE (O & M) 5.1 Operations and Maintenance A well-implemented operation and maintenance (O & M) plan is often the driving force behind energy savings. Such a plan includes preserving institutional knowledge, directs preventative maintenance, and schedules regular inspections of each piece of HVAC equipment within the building. Such a plan includes a regularly scheduled inspection of each piece of HVAC equipment within the building. Routine maintenance includes the timely replacement of filters, belts and pulleys, the proper greasing of bearings and other details such as topping off the glycol tanks. Additional benefits to a maintenance plan are decreased down time for malfunctioning equipment, early indications of problems, prevention of exacerbated maintenance issues, and early detection of overloading/overheating issues. A good maintenance person knows the building’s equipment well enough to spot and repair minor malfunctions before they become major retrofits. Operations and Maintenance staff implementing a properly designed O & M plan will:  Track and document o Renovations and repairs, o Utility bills and fuel consumption, and o System performance.  Keep available for reference o A current Building Operating Plan including an inventory of installed systems, o The most recent available as-built drawings, o Reference manuals for all installed parts and systems, and o An up-to-date inventory of on-hand replacement parts.  Provide training and continuing education for maintenance personnel.  Plan for commissioning and re-commissioning at appropriate intervals. 5.2 Commissioning Commissioning of a building is the verification that the HVAC systems perform within the design or usage ranges of the Building Operating Plan. This process ideally, though seldom, occurs as the last phase in construction. HVAC system operation parameters degrade from ideal over time due to incorrect maintenance, improper replacement pumps, changes in facility tenants or usage, changes in schedules, and changes in energy costs or loads. Ideally, re-commissioning of a building should occur every five to ten years. This ensures that the HVAC system meets the potentially variable use with the most efficient means. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 18 5.3 Building Specific Recommendations A primary area of concern for energy savings in this building is controlling the building temperatures. The following measures should be instituted:  Thermostats and zone valves should be inspected regularly for proper functionality  Heating set points should be kept at a common temperature that meets room comfort levels in respective zones.  Windows should mostly be kept shut during winter months to avoid entire heating zones from being affected by a thermostat in a cold room. There is an energy management system installed in the Boiler Building. This system was not operating at the time of visit. It is recommended that a control contractor/engineer evaluate the system and return it to proper operation. Having this system functioning will:  Allow for the boilers to run at demand or “modulate,” reducing idle losses and saving energy. Note this requires “off” boilers to return to the lowest temperature, say 180-140 degrees F when not operating.  Allow for the combustion air fan to operate, consequently making the Boiler Building door stay closed and preventing the hydronic heater from running constantly  Reduce the need to manually adjust boiler setpoints Also, maintenance staff should receive significant training of the energy management system in order to properly trouble shoot problems the system may encounter. The boilers should have regular maintenance done to maintain high efficiency. Other maintenance/operations issues to be noted:  Occupancy sensors should be adjusted closer to their lower limits as the current time delay to turn lights off seems to be currently maxed out, eliminating a large portion of potential electrical savings.  A glycol leak was noticed in the upper mechanical AHU room. This should be cleaned up and general house-keeping should be performed in this room.  Fuel pumps along with leaking heating fuel oil was noticed in the gym storage room. These fuel pumps are no longer being used and should be removed.  A waste heat heat-exchanger is installed in the upper mechanical room above the library. This waste heat could be used to provide heat to heating coils in unit heaters in the gym. This system should be evaluated and be brought into commission. Doing so will allow for the heating setpoint of the gym AHUs to be lowered, effectively saving fuel oil and energy. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 19 APPENDICES Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 20 Appendix A Recommended Energy Efficiency Measures A number of Energy Efficiency Measures (EEMs) are available to reduce the energy use and overall operating cost for the facility. The EEMs listed below are those recommended by AkWarm based on the calculated savings/investment ration (SIR) as described in Appendix E. AkWarm also provides a breakeven cost, which is the maximum initial cost of the EEM that will still return a SIR of one or greater. This section describes each recommended EEM and identifies the potential energy savings and installation costs. This also details the calculation of breakeven costs, simple payback, and the SIR for each recommendation. The recommended EEMs are grouped together generally by the overall end use that will be impacted. A.1 Temperature Control 9 Programmable thermostats should be installed and programmed in Kaltag School. Programmable thermostats allow for automatic temperature setback, which reduce usage more reliably than manual setbacks. Reduction of the nighttime temperature set point in the classrooms and offices will decrease the energy usage. Currently, temperature control in Kaltag School is poor. In section 4.3, a retrofit to completely redo the existing heating control system is estimated. Reliably controlling the building temperature set point will provide better building comfort and save energy. Rank Building Space Recommendation 1 Kaltag School Fix heating controls to keep building Temperature Setpoint at 68.0 deg F during Occupied times, and Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the School space. Installation Cost $6,000 Estimated Life of Measure (yr) 18 Energy Savings (/yr) $12,297 Breakeven Cost $184,357.01 Savings-to-Investment Ratio 31 Simple Payback (yr) 0.49 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 21 A.2 Electrical Loads A.2.1 Lighting The electricity used by lighting eventually ends up as heat in the building. In areas where electricity is more expensive than other forms of energy, or in areas where the summer temperatures require cooling; this additional heat can be both wasteful and costly. Converting to more efficient lighting reduces cooling loads in the summer and allows the user to control heat input in the winter. The conversion from T12 (one and a half inch fluorescent bulbs) to T8 (one inch), T5 (5/8 inch), Compact Fluorescent Lights (CFL), or LED bulbs provides a significant increase in efficiency. LED bulbs can be directly placed in existing fixtures. The LED bulb bypasses the ballast altogether, which removes the often irritating, “buzzing” noise that magnetic ballasts tend to make. Incandescent lamps are inefficient and any instance should be replaced with more efficient compact fluorescent lamps (CFLs). The primary existing lighting in the majority of the school is ceiling mounted fluorescent fixtures with 32 watt T8 lamps. Kaltag School experiences high costs of electricity and these inefficient lamps should be replaced. Along with the high energy usage, most of the rooms in the school are over-lit. The existing 32 watt T8 lamps can easily be replaced with 25 watt T8 lamps which can re-use the existing electronic ballasts. This lower wattage style of T8 lamp has a light difference of about 10 percent when compared to 32 watt T8 lamps, but this should not be an issue with the current lighting levels. The existing exterior lighting is currently high wattage high pressure sodium lamps. This type of lighting is commonly retrofitted with wall pack style fixtures with LED lamps which use much lower amounts of wattage and will save energy. Rank Location Existing Condition Recommendation 3 Lighting: 114 INCAN A Lamp, Halogen 60W with Manual Switching Replace with FLUOR CFL, Spiral 13 W Installation Cost $6 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $127 Breakeven Cost $772 Savings-to-Investment Ratio 140 Simple Payback yrs 0 Rank Location Existing Condition Recommendation 3 Lighting: 100D, 105A 2 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching Replace with 2 FLUOR (2) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic Installation Cost $35 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $77 Breakeven Cost $470 Savings-to-Investment Ratio 13 Simple Payback yrs 0 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 22 Rank Location Existing Condition Recommendation 3 Lighting: 101 2 INCAN (5) A Lamp, Halogen 60W with Manual Switching Replace with 2 FLUOR (5) CFL, Spiral 13 W Installation Cost $60 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $62 Breakeven Cost $380 Savings-to-Investment Ratio 6.3 Simple Payback yrs 1 Rank Location Existing Condition Recommendation 3 Lighting: 120 MH 250 Watt StdElectronic with Manual Switching Replace with LED 100W Module StdElectronic Installation Cost $1,000 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $510 Breakeven Cost $5,772 Savings-to-Investment Ratio 5.8 Simple Payback yrs 2 Rank Location Existing Condition Recommendation 3 Lighting: 102, 103, 104, 107, 108, 109 37 FLUOR (3) T8 4' F32T8 32W Standard (2) Instant StdElectronic with Manual Switching, Occupancy Sensor Replace with 37 FLUOR (3) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic Installation Cost $851 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $593 Breakeven Cost $3,609 Savings-to-Investment Ratio 4.2 Simple Payback yrs 1 Rank Location Existing Condition Recommendation 3 Lighting: 114, 115 22 FLUOR (3) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching, Occupancy Sensor Replace with 22 FLUOR (3) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic Installation Cost $506 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $278 Breakeven Cost $1,694 Savings-to-Investment Ratio 3.3 Simple Payback yrs 2 Rank Location Existing Condition Recommendation 3 Lighting: 116, 117, J1 5 FLUOR (4) T12 4' F40T12 34W Energy- Saver (2) StdElectronic with Manual Switching Replace with 5 FLUOR (4) T8 4' F32T8 25W Energy-Saver (2) Instant HighEfficElectronic Installation Cost $374 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $182 Breakeven Cost $1,128 Savings-to-Investment Ratio 3.0 Simple Payback yrs 2 Rank Location Existing Condition Recommendation 3 Lighting: 100A, 100B, 100C, 100D, DOE Hallway, 101, 105a, 105b, 106, 112, 133a, 113b 75 FLUOR (2) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching, Occupancy Sensor Replace with 75 FLUOR (2) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic Installation Cost $1,294 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $630 Breakeven Cost $3,837 Savings-to-Investment Ratio 3.0 Simple Payback yrs 2 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 23 A.2.2 Other Electrical Loads There are no EEMs recommended as there are no significant plug loads in Merreline A. Kangas School. A.3 Building Envelope: Recommendations for change No EEMs are recommended in this area. An insulation upgrade by adding rigid foam and T1-11 to the current walls was considered but is not economical at this time. A.3.2 Foundation and/or Crawlspace No retrofit is recommended in this area. An upgrade to the existing floor insulation by furring out with 2x6 boards, adding 6-inches of fiberglass and covering with plywood was considered but is not economic at this time. As fuel oil prices are expected to continue to rise, this retrofit could be considered in the future. See appendix B. A.3.3 Roofing and Ceiling No EEMs are recommended in this area. Increasing the insulation value of the roof is not economical at this time. Rank Location Existing Condition Recommendation 3 Lighting: Exterior Lighting 11 HPS 150 Watt StdElectronic with Manual Switching Replace with 11 LED 50W Module StdElectronic Installation Cost $11,638 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $1,990 Breakeven Cost $23,372 Savings-to-Investment Ratio 2.0 Simple Payback yrs 6 Rank Location Existing Condition Recommendation 3 Lighting: 111 13 FLUOR (3) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching, Occupancy Sensor Replace with 13 FLUOR (3) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic Installation Cost $299 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $98 Breakeven Cost $597 Savings-to-Investment Ratio 2.0 Simple Payback yrs 3 Rank Location Existing Condition Recommendation 3 Lighting: 110 FLUOR (3) T8 4' F32T8 32W Standard Instant StdElectronic with Manual Switching Replace with FLUOR (3) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic Installation Cost $23 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $3 Breakeven Cost $17 Savings-to-Investment Ratio 0.7 Simple Payback yrs 8 A.3.1 Exterior Walls Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 24 A.3.4 Windows No EEMs are recommended in this area. Replacing the existing windows with better insulated windows was considered but is not economical at this time. A.3.5 Doors No EEMs are recommended in this area. Replacing the existing doors with better insulated doors was considered but is not economical at this time. A.4 Building Heating System / Air Conditioning A.4.1 Heating and Heat Distribution Installing vent dampers on the existing chimney connectors can help to reduce boiler idle loss and save energy. A.4.2 Air Conditioning No EEMs are recommended in this area as there is no air conditioning system installed in this building. A.4.3 Ventilation No EEMs are recommended in this area. However, the control system for the AHUs should be regularly inspected to insure proper AHU operation. A.4.4 Air Changes and Air Tightening No other EEMs are recommended in this area because of the difficulty of quantifying the amount of leaking air and the savings. However, using a blower door test with an infra-red camera, the location of significant leaks can be determined and repaired. Rank Recommendation 2 Install 5 vent dampers on the existing chimney connectors Installation Cost $3,750 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $1,330 Breakeven Cost $18,042 Savings-to-Investment Ratio 4.8 Simple Payback yrs 3 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 25 Appendix B Energy Efficiency Measures that are NOT Recommended As indicated in other sections of the report, a number of potential EEMs were identified that were determined to be NOT cost effective by the AkWarm model. These EEMs are not currently recommended on the basis of energy savings alone because each may only save a small amount of energy, have a high capital cost, or be expensive to install. While each of these EEMs is not cost effective at this time, future changes in building use such as longer operating hours, higher energy prices, new fixtures or hardware on the market, and decreases in installation effort may make any of these EEMs cost effective in the future. These potential EEMs should be reviewed periodically to identify any changes to these factors that would warrant re-evaluation. Although these upgrades are not currently cost effective on an energy cost basis, the fixtures, hardware, controls, or operational changes described in these EEMs should be considered when replacing an existing fixture or unit for other reasons. For example, replacing an existing window with a triple-pane window may not be cost effective based only on energy use, but if a window is going to be replaced for some other reason, then the basis for a decision is only the incremental cost of upgrading from a less efficient replacement window to a more efficient replacement window. That incremental cost difference will have a significantly shorter payback, especially since the installation costs are likely to be the same for both units. The following measures were not found to be cost-effective: Rank Feature/ Location Improvement Description Estimated Annual Energy Savings Estimated Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 4 Exposed Floor: Main School Add R-19 to floor $2,723 $98,463 0.63 36 5 Lighting: Gym 2nd Floor Replace with 6 FLUOR (4) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic $11 $173 0.39 16 6 Window/Skylight: Single Other Wood Storm Replace existing window with U-0.30 vinyl window $176 $8,581 0.35 49 7 Window/Skylight: Double Other Wd-Vn <3/8 Replace existing window with U-0.30 vinyl window $115 $5,814 0.33 550 8 Above-Grade Wall: Boiler Building Install R-30 rigid foam board to exterior and cover with T1-11 siding or equivalent. $203 $17,069 0.27 84 9 Window/Skylight: Double Other Wd-Vn >3/8 Replace existing window with U-0.30 vinyl window $9 $551 0.27 62 10 Above-Grade Wall: Main Building Install R-30 rigid foam board to exterior and cover with T1-11 siding or equivalent. $3,415 $288,470 0.27 85 11 Lighting: Boiler Building Replace with 4 FLUOR (2) T8 4' F32T8 25W Energy-Saver Instant HighEfficElectronic $2 $69 0.17 37 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 26 The following measures were not found to be cost-effective: Rank Feature/ Location Improvement Description Estimated Annual Energy Savings Estimated Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 12 Window/Skylight: Triple South Vinyl Replace existing window with U-0.30 vinyl window $23 $2,767 0.14 122.0 Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 27 Appendix C Significant Equipment List HVAC Equipment Equipment Manufacturer Model No. Fuel Type Estimated Efficiency Notes Boilers Weil Mclain WG-09 #1 Fuel Oil 80% Qty: 5 Circulation Pumps: CP1A, CP1B Grundfos TP 80-240 Electric 83% 3 HP, 100 GPM Circulation Pumps: CP3A, CP3B, CP3C, CP3D, CP3E Taco 00014-F1 Electric - 1/8 HP AHU-1 motor Baldor EM3116T-8 Electric 85.5% 1 HP, 1740 RPM AHU-2 motor Baldor EM3157T-8 Electric 86.5% 2 HP, 1725 RPM AHU-3 motor Baldor EM3157T-8 Electric 86.5% 2 HP, 1725 RPM AHU-4 motor Baldor EM3154T-8 Electric 86.5% 1.5 HP, 1725 RPM AHU-5 motor Baldor EM3116T-8 Electric 85.5% 1 HP, 1740 RPM Hot Water Circulation Pump Grundfos UP 15-18B7 Electric - - Gym Unit Heaters Modine - - - Not running during visit Entrance Cabinet Heaters Trane - - - - Lighting Location Lighting Type Bulb Type Quantity KWH/YR Cost/YR 102- Gym Fluorescent T5 16 14,180 $ 5,956 100A, 100B, 100C, 100D, DOE Hallway, 101, 105a, 105b, 106, 112, 133a, 113b Fluorescent T8 75 8,025 3,371 Exterior Lighting HID 150W 11 7,154 3,005 102, 103, 104, 107, 108, 109 Fluorescent T8 37 6,826 2,867 114, 115 Fluorescent T8 22 3,481 1,462 120 HID 250W 1 2,452 1,030 116, 117, J1 Fluorescent T12 5 1,506 633 111 Fluorescent T8 13 1,234 518 100D, 105A Fluorescent T8 2 1,009 424 Energy Consumption calculated by AkWarm based on wattage, schedule and an electric rate of $ 0.42/kWh Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 28 Plug Loads Equipment Location Manufacturer KWH/YR Cost/YR Full Size Refrigerators/Freezers Kitchen, 103 varies 6,000 $ 2,520 Server Tower 102 varies 3,068 1,289 Mini Fridges Qty:2 Classrooms varies 800 336 Laptops Classrooms varies 694 291 Space Heater Classroom - 549 231 Computer Towers Classrooms varies 484 203 Coffee Pots 114, Kitchen Bunn 413 173 Computer Monitors Classrooms varies 322 135 Energy Consumption calculated by AkWarm based on wattage, schedule and an electric rate of $ 0.42/kWh Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 29 Appendix D Local Utility Rate Structure The information in this section was provided directly from the local utility or gathered from the local utility’s publicly available information at the time of the audit. All language used in this section was provided by the local utility and believed to be current at the time of the audit. Energy use terms, specific fees, and other specific information are subject to change. Updated rate structure information should be gathered from the utility during future discussion of rates, rate structures and utility pricing agreements. Kaltag School is classified as a Large Power GS-2 customer. Alaska Village Electric Cooperative, Inc. (AVEC) 4831 Eagle St. Anchorage, Alaska, 99503 (907) 561-1818 AVEC Large Power (GS-2) Rate Structure Rate Component Unit Charge Customer Charge $45.00 First 1500 kWh $0.12 per kWh Over 1500 kWh $0.04 per kWh Demand Charge $45.00/KW Cost of Fuel $0.2727 per kWh Regulatory Cost Charge (RCC) $0.000492 per kWh Average 2010 Rate (Kaltag School) $0.42 per kWh Customer Charge A flat fee that covers costs for meter reading, billing and customer service. Utility Charge (kWh charge) This charge is multiplied by the number of kilowatt-hours (kWh) used in a monthly billing period. It covers the costs to maintain power plants and substations, interest on loans as well as wires, power poles and transformers. Regulatory Charge This charge of .000492 per kWh is set by the Regulatory Commission of Alaska (RCA). Since November 1, 1992, the Regulatory Commission of Alaska has been funded by a Regulatory Charge to the utilities it regulates rather than through the State general fund. The charge, labeled "Regulatory Cost Charge." on your bill, is set by the RCA, and applies to all retail kilowatt-hours sold by regulated electric utilities in Alaska. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 30 Demand Charge This charge is based upon high KW demand during the month or 85% of the highest KW demand (ratchet) during the past 12 months, whichever is higher. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 31 Appendix E Analysis Methodology Data collected was processed using AkWarm energy use software to estimate current energy consumption by end usage and calculate energy savings for each of the proposed energy efficiency measures (EEMs). In addition, separate analysis may have been conducted to evaluate EEMs that AkWarm cannot effectively model to evaluate potential reductions in annual energy consumption. Analyses were conducted under the direct supervision of a Certified Energy Auditor, Certified Energy Manager, or a Professional Engineer. EEMs are evaluated based on building use, maintenance and processes, local climate conditions, building construction type, function, operational schedule and existing conditions. Energy savings are calculated based on industry standard methods and engineering estimations. Each model created in AkWarm is carefully compared to existing utility usage obtained from utility bills. The AkWarm analysis provides a number of tools for assessing the cost effectiveness of various improvement options. The primary assessment value used in this audit report is the Savings/Investment Ratio (SIR). The SIR is a method of cost analysis that compares the total cost savings through reduced energy consumption to the total cost of a project over its assumed lifespan, including both the construction cost and ongoing maintenance and operating costs. Other measurement methods include Simple Payback, which is defined as the length of time it takes for the savings to equal the total installed cost and Breakeven Cost, which is defined as the highest cost that would yield a Savings/Investment Ratio of one. EEMs are recommended by AkWarm in order of cost-effectiveness. AkWarm first calculates individual SIRs for each EEM, and then ranks the EEMs by SIR, with higher SIRs at the top of the list. An individual EEM must have a SIR greater than or equal to one in order to be recommended by AkWarm. Next AkWarm modifies the building model to include the installation of the first EEM and then re-simulates the energy use. Then the remaining EEMs are re- evaluated and ranked again. AkWarm goes through this iterative process until all suggested EEMs have been evaluated. Under this iterative review process, the savings for each recommended EEM is calculated based on the implementation of the other, more cost effective EEMs first. Therefore, the implementation of one EEM affects the savings of other EEMs that are recommended later. The savings from any one individual EEM may be relatively higher if the individual EEM is implemented without the other recommended EEMs. For example, implementing a reduced operating schedule for inefficient lighting may result in relatively higher savings than implementing the same reduced operating schedule for newly installed lighting that is more efficient. If multiple EEMs are recommended, AkWarm calculates a combined savings. Inclusion of recommendations for energy savings outside the capability of AkWarm will impact the actual savings from the AkWarm projections. This will almost certainly result in lower energy savings and monetary savings from AkWarm recommendations. The reality is that only so much energy is consumed in a building. Energy savings from one EEM reduces the amount of energy that can be saved from additional EEMs. For example, installation of a lower wattage light bulb does not save energy or money if the bulb is never turned on because of a schedule or operational change at the facility. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 32 Appendix F Audit Limitations The results of this audit are dependent on the input data provided and can only act as an approximation. In some instances, several EEMs or installation methods may achieve the identified potential savings. Actual savings will depend on the EEM selected, the price of energy, and the final installation and implementation methodology. Competent tradesmen and professional engineers may be required to design, install, or otherwise implement some of the recommended EEMs. This document is an energy use audit report and is not intended as a final design document, operation, and maintenance manual, or to take the place of any document provided by a manufacturer or installer of any device described in this report. Cost savings are calculated based on estimated initial costs for each EEM. Estimated costs include labor and equipment for the full up-front investment required to implement the EEM. The listed installation costs within the report are conceptual budgetary estimates and should not be used as design estimates. The estimated costs are derived from Means Cost Data, industry publications, local contractors and equipment suppliers, and the professional judgment of the CEA writing the report and based on the conditions at the time of the audit. Cost and energy savings are approximations and are not guaranteed. Additional significant energy savings can usually be found with more detailed auditing techniques that include actual measurements of electrical use, temperatures in the building and HVAC ductwork, intake and exhaust temperatures, motor runtime and scheduling, and infrared, air leakage to name just a few. Implementation of these techniques is the difference between a Level III Energy Audit and the Level II Audit that has been conducted. Disclaimer: "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." Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 33 Appendix G References Although not all documents listed below are specifically referenced in this report, each contains information and insights considered valuable to most buildings. Alaska Department of Education and Early Development; Education Support Services/Facilities. (1999). Alaska School Facilities Preventative Maintenance Handbook. Juneau, AK: Alaska Department of Education and Early Development. Alaska Housing Finance Corportation. (2010). Retrofit Energy Assessment for Loans. AHFC. ASHRAE. (1997). 1997 ASHRAE Handbook: Fundamentals. Atlanta, GA: ASHRAE. ASHRAE. (2007). ASHRAE Standard 105-2007 Expressing and Comparing Building Energy Performance. Retrieved from ASHRAE: www.ashrae.org ASHRAE. (2007). ASHRAE Standard 90.1-2007 Energy Standards for buildings Except Low-Rise Residential Buildings. Retrieved from ASHRAE: www.ashrae.org ASHRAE. (2010). ASHRAE Standard 62.1-2010 Ventilaton for Acceptable Indoor Air Quality. Retrieved from ASHRAE: www.ashrae.org ASHRAE. (2010). ASHRAE Standard 62.2-2010 Ventilation and Acceptable Indoor Air Quality in Low Rise Residential Buildings. Retrieved from ASHRAE: www.ashrae.org ASHRAE RP-669 and SP-56. (2004). Procedures for Commercial Building Energy Audits. Atlanta, GA: ASHRAE. Coad, W. J. (1982). Energy Engineering and Management for Building Systems. Scarborough, Ontario, Canada: Van Nostrand Reinhold Company. Daley, D. T. (2008). The Little Black Book of Reliability Management. New York, NY: Industrial Press, Inc. Federal Energy Management Program. (2004, March 3). Demand Controlled Ventilation Using CO2 Sensors. Retrieved 2011, from US DOE Energy Efficiency and Renewable Energy: http://www.eere.energy.gov/femp/pdfs/fta_co2.pdf Federal Energy Management Program. (2006, April 26). Low-Energy Building Design Guidelines. Retrieved 2011, from Department of Energy; Federal Energy Management Program: http://www.eren.doe.gov/femp/ Institute, E. a. (2004). Variable Speed Pumping: A Guide to Successful Applications. Oxford, UK: Elsevier Advanced Technology. International Code Council. (2009). International Energy Conservation Code. Country Club Hills, IL: International Code Council, Inc. Leach, M., Lobato, C., Hirsch, A., Pless, S., & Torcellini, P. (2010, September). Technical Support Document: Strategies for 50% Energy Savings in Large Office Buildings. Retrieved 2011, from National Renewable Energy Laboratory: http://www.nrel.gov/docs/fy10osti/49213.pdf Thumann, P.E., C.E.M., A., Younger, C.E.M., W. J., & Niehus, P.E., C.E.M., T. (2010). Handbook of Energy Audits Eighth Edition. Lilburn, GA: The Fairmont Press, Inc. U.S. Energy Information Administration. (2006). Commercial Building Energy Consumption Survey (CBECS). Retrieved 2011, from Energy Information Administration: http://www.eia.gov/emeu/cbecs/ Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 34 Appendix H Typical Energy Use and Cost – Fairbanks and Anchorage This report provides data on typical energy costs and use on selected building in Fairbanks and Anchorage, Alaska for comparative purposes only. The values provided by the US Energy Information Administration CBECS study included a broader range of building types for the Continental U.S. are not necessarily good comparatives for buildings and conditions in Alaska. An assortment of values from CBECS may be found in Appendix I. The Alaska data described in this report came from a benchmarking study NORTECH and other Technical Services Providers (TSPs) completed on publicly owned buildings in Alaska under contract with AHFC. This study acquired actual utility data for municipal buildings and schools in Alaska for the two recent full years. The utility data included costs and quantities including fuel oil, electricity, propane, wood, steam, and all other energy source usage. This resulted in a database of approximately 900 buildings. During the course of the benchmarking study, the comparisons made to the CBECS data appeared to be inappropriate for various reasons. Therefore, this energy use audit report references the average energy use and energy cost of Anchorage and Fairbanks buildings as described below. The Alaska benchmarking data was evaluated in order to find valid comparison data. Buildings with major energy use information missing were eliminated from the data pool. After detailed scrutiny of the data, the most complete information was provided to NORTECH by the Fairbanks North Star Borough School District (FNSBSD) and the Anchorage School District (ASD). The data sets from these two sources included both the actual educational facilities as well as the district administrative buildings and these are grouped together in this report as Fairbanks and Anchorage schools. These two sources of information, being the most complete and reasonable in-state information, have been used to identify an average annual energy usage for Fairbanks and for Anchorage in order to provide a comparison for other facilities in Alaska. Several factors may limit the comparison of a specific facility to these regional indicators. In Fairbanks, the FNSBSD generally uses number two fuel oil for heating needs and electricity is provided by Golden Valley Electric Association (GVEA). GVEA produces electricity from a coal fired generation plant with additional oil generation upon demand. A few of the FNSBSD buildings in this selection utilize district steam and hot water. The FNSBSD has recently (the last ten years) invested significantly in envelope and other efficiency upgrades to reduce their operating costs. Therefore a reader should be aware that this selection of Fairbanks buildings has energy use at or below average for the entire Alaska benchmarking database. Heating in Anchorage is through natural gas from the nearby natural gas fields. Electricity is also provided using natural gas. As the source is nearby and the infrastructure for delivery is in place, energy costs are relatively low in the area. As a result, the ASD buildings have lower energy costs, but higher energy use, than the average for the entire benchmarking database. These special circumstances should be considered when comparing the typical annual energy use for particular buildings. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 35 Appendix I Typical Energy Use and Cost – Continental U.S. Released: Dec 2006 Next CBECS will be conducted in 2007 Table C3. Consumption and Gross Energy Intensity for Sum of Major Fuels for Non-Mall Buildings, 2003 All Buildings* Sum of Major Fuel Consumption Number of Buildings (thousand) Floorspace (million square feet) Floorspace per Building (thousand square feet) Total (trillion BTU) per Building (million BTU) per Square Foot (thousand BTU) per Worker (million BTU) All Buildings* 4,645 64,783 13.9 5,820 1,253 89.8 79.9 Building Floorspace (Square Feet) 1,001 to 5,000 2,552 6,789 2.7 672 263 98.9 67.6 5,001 to 10,000 889 6,585 7.4 516 580 78.3 68.7 10,001 to 25,000 738 11,535 15.6 776 1,052 67.3 72.0 25,001 to 50,000 241 8,668 35.9 673 2,790 77.6 75.8 50,001 to 100,000 129 9,057 70.4 759 5,901 83.8 90.0 100,001 to 200,000 65 9,064 138.8 934 14,300 103.0 80.3 200,001 to 500,000 25 7,176 289.0 725 29,189 101.0 105.3 Over 500,000 7 5,908 896.1 766 116,216 129.7 87.6 Principal Building Activity Education 386 9,874 25.6 820 2,125 83.1 65.7 Food Sales 226 1,255 5.6 251 1,110 199.7 175.2 Food Service 297 1,654 5.6 427 1,436 258.3 136.5 Health Care 129 3,163 24.6 594 4,612 187.7 94.0 Inpatient 8 1,905 241.4 475 60,152 249.2 127.7 Outpatient 121 1,258 10.4 119 985 94.6 45.8 Lodging 142 5,096 35.8 510 3,578 100.0 207.5 Retail (Other Than Mall) 443 4,317 9.7 319 720 73.9 92.1 Office 824 12,208 14.8 1,134 1,376 92.9 40.3 Public Assembly 277 3,939 14.2 370 1,338 93.9 154.5 Public Order and Safety 71 1,090 15.5 126 1,791 115.8 93.7 Religious Worship 370 3,754 10.1 163 440 43.5 95.6 Service 622 4,050 6.5 312 501 77.0 85.0 Warehouse and Storage 597 10,078 16.9 456 764 45.2 104.3 Other 79 1,738 21.9 286 3,600 164.4 157.1 Vacant 182 2,567 14.1 54 294 20.9 832.1 This report references the Commercial Buildings Energy Consumption Survey (CBECS), published by the U.S. Energy Information Administration in 2006. Initially this report was expected to compare the annual energy consumption of the building to average national energy usage as documented below. However, a direct comparison between one specific building and the groups of buildings outlined below yielded confusing results. Instead, this report uses a comparative analysis on Fairbanks and Anchorage data as described in Appendix F. An abbreviated excerpt from CBECS on commercial buildings in the Continental U.S. is below. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 36 Appendix J List of Conversion Factors and Energy Units 1 British Thermal Unit is the energy required to raise one pound of water one degree F° 1 Watt is approximately 3.412 BTU/hr 1 horsepower is approximately 2,544 BTU/hr 1 horsepower is approximately 746 Watts 1 "ton of cooling” is approximately 12,000 BTU/hr, the amount of power required to melt one short ton of ice in 24 hours 1 Therm = 100,000 BTU 1 KBTU = 1,000 BTU 1 KWH = 3413 BTU 1 KW = 3413 BTU/Hr 1 Boiler HP = 33,400 BTU/Hr 1 Pound Steam = approximately 1000 BTU 1 CCF of natural gas = approximately 1 Therm 1 inch H2O = 250 Pascal (Pa) = 0.443 pounds/square inch (psi) 1 atmosphere (atm) = 10,1000 Pascal (Pa) BTU British Thermal Unit CCF 100 Cubic Feet CFM Cubic Feet per Minute GPM Gallons per minute HP Horsepower Hz Hertz kg Kilogram (1,000 grams) kV Kilovolt (1,000 volts) kVA Kilovolt-Amp kVAR Kilovolt-Amp Reactive KW Kilowatt (1,000 watts) KWH Kilowatt Hour V Volt W Watt Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 37 Appendix K List of Acronyms, Abbreviations, and Definitions ACH Air Changes per Hour AFUE Annual Fuel Utilization Efficiency Air Economizer A duct, damper, and automatic control system that allows a cooling system to supply outside air to reduce or eliminate the need for mechanical cooling. Ambient Temperature Average temperature of the surrounding air Ballast A device used with an electric discharge lamp to cause the lamp to start and operate under the proper circuit conditions of voltage, current, electrode heat, etc. CO2 Carbon Dioxide CUI Cost Utilization Index CDD Cooling Degree Days DDC Direct Digital Control EEM Energy Efficiency Measure EER Energy Efficient Ratio EUI Energy Utilization Index FLUOR Fluorescent Grade The finished ground level adjoining a building at the exterior walls HDD Heating Degree Days HVAC Heating, Ventilation, and Air-Conditioning INCAN Incandescent NPV Net Present Value R-value Thermal resistance measured in BTU/Hr-SF-̊F (Higher value means better insulation) SCFM Standard Cubic Feet per Minute Savings to Investment Ratio (SIR) Savings over the life of the EEM divided by Investment capital cost. Savings includes the total discounted dollar savings considered over the life of the improvement. Investment in the SIR calculation includes the labor and materials required to install the measure. Set Point Target temperature that a control system operates the heating and cooling system Simple payback A cost analysis method whereby the investment cost of an EEM is divided by the first year’s savings of the EEM to give the number of years required to recover the cost of the investment. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 38 Appendix L Building Floor Plan Floor plan provided by USKH and Yukon Koyukuk School District. Dimensions are based on field measurements by NORTECH. Energy Audit – Final Report Kaltag School Kaltag, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-300 Doyon Other Region\50-560 Yukon Koyukuk SD\50-564 Kaltag School\Reports\Final\2012.07.20 Final AHFC Report V2 KAL Kaltag School D1.Docx 39 Floor plan provided by USKH and Yukon Koyukuk School District. Dimensions are based on field measurements by NORTECH.