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Home My WebLink AboutFAI FNSB Woodriver Elementary 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 WOODRIVER ELEMENTARY 5000 Palo Verde Ave. Fairbanks, Alaska Prepared for: Mr. Larry Morris Fairbanks North Star Borough School District Prepared by: David Lanning PE, CEA Doug Dusek CEA Sheldon Thompson CEA Steven Billa EIT, CEAIT June 15, 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\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary ..................................... 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx ii APPENDICES Appendix A Recommended Energy Efficiency Measures .......................................... 20 Appendix B Energy Efficiency Measures that are NOT Recommended ..................... 29 Appendix C Significant Equipment List ...................................................................... 30 Appendix D Local Utility Rate Structure ..................................................................... 32 Appendix E Analysis Methodology ............................................................................ 34 Appendix F Audit Limitations ..................................................................................... 35 Appendix G References ............................................................................................. 36 Appendix H Typical Energy Use and Cost – Fairbanks and Anchorage ..................... 37 Appendix I Typical Energy Use and Cost – Continental U.S. ................................... 38 Appendix J List of Conversion Factors and Energy Units .......................................... 39 Appendix K List of Acronyms, Abbreviations, and Definitions .................................... 40 Appendix L Building Floor Plan ................................................................................. 41 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 1 1.0 EXECUTIVE SUMMARY NORTECH has completed an ASHRAE Level II Energy Audit of Woodriver Elementary, a 64,060 square foot facility in the Fairbanks Northstar Borough 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 March 15, 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 Woodriver Elementary 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 Savings Estimated Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 1 Refrigeration - Power Retrofit: Mini Fridge Remove 21 individual mini- fridges and use a central refrigerator, Replace vending machines with energy efficient models and shut off during unoccupied times $1,099 $100 50 0.1 2 Lighting – Woodriver Elementary Replace T12s with 17 watt LED tubes, Replace T5s with 15 watt LED tubes, Replace exterior lighting with LEDs, Replace incandescent lamps with compact fluorescent lamps (CFLs) $23,128 $191,174 1.7 8.3 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 2 PRIORITY LIST – ENERGY EFFICIENCY MEASURES (EEMs) Rank Feature/ Location Improvement Description Estimated Annual Savings Estimated Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) 3 Window/Skylight: Single Pane Aluminum Replace windows in rooms F150, F155, F210, F230 and F232 with U-0.22 vinyl windows $612 $8,520 1.2 14 TOTAL, cost-effective measures $24,839 $199,795 1.5 8.8 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 3 Modeled Building Energy Cost Breakdown The above charts are a graphical representation of the modeled energy usage for Woodriver Elementary. The greatest portions of energy cost for the building are 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 $60,762 34% Ceiling $13,777 8% Window $4,179 2% Wall/Door $6,774 4% Floor $17,216 10% Water Heating $17,570 10% Exhaust Fans $744 0% Lighting $41,510 23% Refrigeration $3,285 2% Other Electrical $7,940 5% Cooking $3,631 2% Clothes Drying $113 0% Existing Building Energy Cost Breakdown Total Cost $ 177,501 Envelope Air Losses $63,526 35% Ceiling $14,404 8% Window $3,383 2% Wall/Door $7,029 4% Floor $18,000 10% Water Heating $17,266 9% Exhaust Fans $744 0% Lighting $17,033 9% Refrigeration $1,800 1% Other Electrical $7,940 4% Cooking $3,631 2% Clothes Drying $113 0% Maint. Savings $2,206 1% Lighting Savings $24,477 13% Remaining Savings -$1,844 -1% Retrofit Building Energy Cost Breakdown Total Cost $152,662 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary provides Pre-School through 6th grade education in Fairbanks, Alaska. The school is composed of classrooms, offices, a library, and a gymnasium. 2.2 Building Occupancy and Schedules Woodriver Elementary typically has an average of 450 students and 45 faculty members. The building is occupied by students from 9:00 am to 3:30 pm and by faculty from 8:30 am to 4:30 pm. Custodial staff members typically occupy the building at all hours. 2.3 Building Description Woodriver Elementary is a one-story wood framed building on an insulated concrete slab foundation originally constructed in 1976. A 237 square foot heated Appliance Shed is located next to the school and is included in the square footages and calculations for this report. Building Envelope Building Envelope: Walls Wall Type Description Insulation Notes School Walls 8” concrete blocks (CMU) w/ 2x4 furring 3 1/2-inches of insulation No signs of insulation damage. Appliance Shed Walls Wood-framed with 2x6 studs spaced 16-inches on center. R-19 fiberglass batt. No signs of insulation damage. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 5 Heating and Ventilation Systems Heat in Woodriver Elementary is provided by two oil fired boilers. Circulation pumps distribute heat throughout the building to:  Perimeter baseboard heaters in classrooms  Air Handling Unit (AHU) heating coils  Cabinet Heaters in entry ways  Hydronic Unit Heaters in vestibules, mechanical rooms and misc. areas Building Envelope: Floors Floor Type Description Insulation Notes School Floor Insulated slab 2-inches of rigid foam on perimeter - Appliance Shed Floor Wood-framed 2x8 joists spaced 16-inches on center R-25 fiberglass batt - Building Envelope: Roof Roof Type Description Insulation Notes School Roof Cathedral Style Roof R-38 fiberglass batt No signs of insulation damage. Appliance Shed Cold roof framed with wood trusses. R-30 fiberglass batt No signs of insulation damage Building Envelope: Doors and Windows Door and Window Type Description Estimated R-Value Notes Door Type 1 Metal: ½ lite glass 1.7 185 sq ft Door Type 2 Metal: ¼ lite glass 2.0 82 sq ft Door Type 3 Metal: Flush 2.7 162 sq ft Window Type 1 Aluminum: Single Pane Glass 0.8 18 sq ft Window Type 2 Aluminum: Double Pane Glass 1.1 95 sq ft Window Type 3 Aluminum: Triple Pane Glass 1.9 318 sq ft Window Type 4 Vinyl: Triple Pane Glass 2.3 1,099 sq ft Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 6 Heat is controlled by electronic thermostats. The maintenance department controls set-point temperatures within standard policies. There are five AHUs In Woodriver Elementary:  AHU-1 provides ventilation and heat to the south section of the building along with the Kindergarten sections  AHU-2 provides ventilation and heat to the south section of the building  AHU-3 provides ventilation and heat to the gymnasium and locker rooms  AHU-4 provides ventilation and heat to the north section of the building  AHU-5 provides ventilation to the boiler room Air Conditioning System There is no air conditioning system currently installed in this building, however economizer cooling using the AHUs is provided as needed. Energy Management Demand control ventilation, a direct digital controller (DDC) and economizer cooling make up the energy management in Woodriver Elementary. The DDC system can be controlled on-site as well as off-site by Fairbanks North Star Borough School District (FNSBSD) maintenance staff. Lighting Systems A lighting upgrade from 40 watt T12 lamps to 28 watt T5 lamps has been in progress since 2008. While the majority of lighting in Woodriver Elementary consists primarily of ceiling mounted fluorescent fixtures with 28 watt-T5 lamps (5/8-inch diameter, 4-foot long), 40-watt T12 lamps can still be found in various areas throughout the building. Gym lighting is provided with 250 watt high intensity discharge (HID) lamps, and exterior lighting consists of wall pack and post lamp style fixtures with various sizes of high pressure sodium (HPS) lamps. Domestic Hot Water Domestic hot water is provided by an indirect hot water heater which utilizes glycol heating supply from the boilers. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 8 3.1 Total Energy Use and Cost of 2010 The energy use profiles below show the energy and cost breakdowns for Woodriver Elementary. The total 2010 energy use for the building was 6,118 mmBTU and the total cost was $185,743. These charts show the portion of use for a fuel type and the portion of its cost. The above charts indicate that the highest portion of energy use is for oil and the highest portion of cost is for electricity. Fuel oil consumption correlates directly to space heating and domestic hot water while electrical use can correlate to lighting systems, plug loads, and HVAC equipment. The energy type with the highest cost often provides the most opportunity for savings. Electric 2,157 35% Oil 3,961 65% Energy Use Total (mmBTU) Electric 112,139 60% Oil 73,604 40% Energy Cost Total ($) Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary has an EUI of 95,500 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 Woodriver Elementary relative to these values. These findings are discussed further in Appendix H. 95,500 62,000 123,000 0 20000 40000 60000 80000 100000 120000 140000 Btu/ Sq. Ft Annual Energy Use Index (Total Energy/ SF) Woodriver Elementary Fairbanks Schools Anchorage Schools Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary is about $2.90/SF. This is based on utility costs from 2010 and the following rates: Electricity at $ 0.18 / kWh ($ 5.27 / Therm) # 2 Fuel Oil at $ 2.90 / gallon ($ 2.07 / 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 Woodriver Elementary relative to these values. More details are included in Appendix H. $2.90 $2.42 $2.11 $0.00 $0.50 $1.00 $1.50 $2.00 $2.50 $3.00 $3.50 $/Sq. Ft Annual Energy Cost Index (Total Cost/ SF) Woodriver Elementary Fairbanks Schools Anchorage Schools Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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. The clear relation of increased energy usage during periods of cold weather can be seen in the months with higher usage. 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 Jan-09Mar-09May-09Jul-09Sep-09Nov-09Jan-10Mar-10May-10Jul-10Sep-10Nov-10KWH Electrical Consumption Woodriver Elementary 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Jan-09Mar-09May-09Jul-09Sep-09Nov-09Jan-10Mar-10May-10Jul-10Sep-10Nov-10Gallons Fuel Oil Deliveries Woodriver Elementary Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 14 4.1 Understanding How AkWarm Models Energy Consumption NORTECH used the AkWarm model for evaluating the overall energy consumption at Woodriver Elementary. 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 15 4.2 AkWarm Calculated Savings for Woodriver Elementary 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 Water Heating Lighting Refrigeration Other Electrical Cooking Clothes Drying Ventilation Fans Maint. Savings Total Existing Building $102,708 $17,570 $41,510 $3,285 $7,940 $3,631 $113 $744 - $177,501 With All Proposed Retrofits $106,341 $17,266 $17,033 $1,800 $7,940 $3,631 $113 $744 -$2,206 $152,662 Savings -$3,633 $305 $24,477 $1,485 $0 $0 $0 $0 $2,206 $24,839 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. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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. The electric consumption of Woodriver Elementary is uncertain. A lighting upgrade from 40 watt T12s to 28 watt T5s has been a retrofit in progress since 2008. Due to this retrofit, the amount of 40 watt T12 fixtures that were left in the building in 2010 is questionable. The AkWarm model uses the number of fixtures noticed during the audit and has been calibrated to 2010 electrical energy usage. Due to this, the associated total lighting retrofit savings may be overestimated by as much as 10% if the current actual electrical use is much lower than that of 2010. Therefore, the model of Woodriver Elementary was not calibrated within NORTECH standards in AKWarm, however retrofits did not require additional outside calculations. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 17 5.0 BUILDING OPERATION AND MAINTENANCE (O & M) 5.1 Operations and Maintenance A well-implemented operation and maintenance (O & M) plan, by preserving institutional knowledge and directing preventative maintenance, is often the driving force behind energy savings. 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 18 5.3 Building Specific Recommendations Woodriver Elementary is well maintained. Mechanical areas are well kept and the systems are currently functioning properly. Some general recommendations for improvements to the FNSBSD maintenance program will be made in a separate report. A few recommendations for Woodriver Elementary include:  Finding a way to shut off the boilers in the summertime will produce significant savings from standby losses. This boiler idle loss greatly contributes to the envelope air losses shown in the Modeled Building Energy Cost Breakdown graphs in Section 1.0.  A few motors in the boiler room, such as CH04 should be replaced due to old age and possible operation problems from bearings, etc. Ventilation outside air (OSA) make up a large portion of envelope air losses shown in the Modeled Building Energy Cost Breakdown graphs in Section 1.0. Although currently being controlled by DDC, the amounts of OSA should be carefully monitored to determine the level of savings possible if OSA is set to a minimum. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 19 APPENDICES Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.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 Temperature setbacks are already performed in Woodriver Elementary. When the weather begins to warm up, the building is allowed to “drift,” that is bring the temperature up to 68 degrees F, shut off the heating components and allow for the temperature to float uncontrollably until the DDC clock restarts the system. 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. The primary existing lighting in the majority of the school is ceiling mounted fluorescent fixtures with 40 watt T12 lamps and 28 watt T5 lamps. As the cost of electricity cost of electricity is expected to continue to rise, the inefficient T12 lamps when possible should be replaced. Even though the school is being retrofitted to efficient 28 watt T5 lamps, more efficient LED tube lamps are available. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 21 Along with the high energy usage, most of the rooms in the school are slightly over-lit in terms of foot candles (FCs). Examples of existing lighting levels:  Room 18: 50 FC  Room 16: 60 FC  Room 23: 50 FC  Room 28: 54 FC  F126: 69 FC  F143: 97 FC  F151: 120 FC The existing 40 watt T12 lamps can easily be retrofitted with 17 watt LED tubes using the existing T12 fixtures. The existing 28 watt T5 lamps can easily be retrofitted with 15 watt LED tubes using the existing T5 fixtures. The lower wattage style lighting has a light difference of about 10 percent when compared to the existing lamps, but this should not be an issue given the current lighting levels. Additional savings could be found with reducing lighting levels to standard levels. Replacing all lighting within the school is a large capital investment. Fluorescent lamps experience lumen depreciation, essentially meaning that as lamps get older their lighting levels go down. It is very likely that replacing all 40 watt T12s with 17 watt LED tube lighting will result in lighting levels similar to the existing lighting levels in the building. Satisfaction with LED lighting can be tested by installing 17 watt LED tube lighting in one area or room before investing completely into this recommendation. The same test should be performed for the T5 to 15 watt LED retrofit suggestion. The existing exterior lighting is high wattage high pressure sodium lamps. This type of lighting is commonly retrofitted with wall pack style fixtures with LED lamps using much lower amounts of wattage and will save energy. The post style lamps can be replaced with LED post light style fixtures. Gym lighting is currently provided by 250 watt HID lamps. A new retrofit for this style of lighting is LED pendant lighting. LED pendants can be installed directly into the existing wiring after ballasts are bypassed, and can even utilize the existing hooks cutting down on installation costs. The LED pendants produce comparable lighting levels to that of the 250 HID lamps. To save additional energy, occupancy sensors can be installed in the gym to ensure that lighting is turned off during unoccupied times. The ceiling mounted fluorescent fixtures with T12 U-Bend lamps can be replaced with T8 style U-Bend lamps which produce similar levels of lighting at a lower energy usage. Maintenance savings are based on 17 year life of LEDs and 7 year life of fluorescent lamps. This essentially results the avoidance of 2.5 lamp changes over the life of the LED which is estimated as $8/lamp for replacement and disposal each time. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 22 Rank Location Existing Condition Recommendation 2 Exterior 8 INCAN A Lamp, Halogen 100W with Manual Switching Replace with 8 LED 17W Module StdElectronic Energy Savings (/yr) $392 Installation Cost $200 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $3 Breakeven Cost $5,122 Savings-to-Investment Ratio 26 Simple Payback yrs 1 Rank Location Existing Condition Recommendation 2 F146 2 INCAN A Lamp, Std 60W with Manual Switching Replace with 2 LED 10W Module StdElectronic Energy Savings (/yr) $39 Installation Cost $44 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $2 Breakeven Cost $536 Savings-to-Investment Ratio 12 Simple Payback yrs 1 Rank Location Existing Condition Recommendation 2 F304, F305 3 INCAN A Lamp, Halogen 100W with Manual Switching Replace with 3 FLUOR CFL, Spiral 26 W Energy Savings (/yr) $14 Installation Cost $12 Estimated Life of Measure (yrs) 7 Maintenance Savings (/yr) - Breakeven Cost $83 Savings-to-Investment Ratio 6.9 Simple Payback yrs 1 Rank Location Existing Condition Recommendation 2 4, 8 2 INCAN A Lamp, Halogen 60W with Manual Switching Replace with 2 LED 12W Module StdElectronic Energy Savings (/yr) $26 Installation Cost $50 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $2 Breakeven Cost $338 Savings-to-Investment Ratio 6.8 Simple Payback yrs 2 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 23 Rank Location Existing Condition Recommendation 2 F239 INCAN A Lamp, Halogen 60W with Manual Switching Replace with FLUOR CFL, Spiral 20 W Energy Savings (/yr) $3 Installation Cost $4 Estimated Life of Measure (yrs) 7 Maintenance Savings (/yr) - Breakeven Cost $16 Savings-to-Investment Ratio 3.9 Simple Payback yrs 2 Rank Location Existing Condition Recommendation 2 F217 INCAN A Lamp, Halogen 100W with Manual Switching Replace with FLUOR CFL, Spiral 26 W Energy Savings (/yr) $2 Installation Cost $4 Estimated Life of Measure (yrs) 7 Maintenance Savings (/yr) - Breakeven Cost $11 Savings-to-Investment Ratio 2.7 Simple Payback yrs 2 Rank Location Existing Condition Recommendation 2 FT1- FT6,F102 - F104, F109, F113, F126, F127, F120, F121, F128, F136, F142, F146, F148, F156, F160, F166, F201- F204, F209, F216, F230, F231, F233, F235, F236, F261, T1, T2, G1- G6, B1- B6, 13, 25, 28, 29, 33, 100, 128, 205-208 FLUOR T12 4' F40T12 Magnetic with Manual Switching Replace with LED 17W Module StdElectronic Energy Savings (/yr) $6,168 Installation Cost $36,681 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $482 Breakeven Cost $95,041 Savings-to-Investment Ratio 2.6 Simple Payback yrs 5.5 Rank Location Existing Condition Recommendation 2 Exterior 13 HPS 250 Watt Magnetic with Manual Switching, Daylight Sensor Replace with 13 LED 50W Module StdElectronic Energy Savings (/yr) $1,360 Installation Cost $7,656 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $15 Breakeven Cost $17,813 Savings-to-Investment Ratio 2.3 Simple Payback yrs 6 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 24 Rank Location Existing Condition Recommendation 2 1-, 7, 9-11, 14-28, 32, F100, F106-F108, F117-F119, F125, F126, F143, F144, F145, F149, F150-F155, F200, F210, F212, F229, F232, F237, Sp. Edu A&B FLUOR T5 45.2" F28T5 28W Standard StdElectronic with Manual Switching Replace with LED 15W Module StdElectronic Energy Savings (/yr) $8,248 Installation Cost $84,453 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $1,400 Breakeven Cost $137,88 8 Savings-to-Investment Ratio 1.6 Simple Payback yrs 8.8 Rank Location Existing Condition Recommendation 2 Exterior 5 HPS 400 Watt Magnetic with Manual Switching, Daylight Sensor Replace with 5 LED 150W Module StdElectronic Energy Savings (/yr) $555 Installation Cost $4,900 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $6 Breakeven Cost $7,268 Savings-to-Investment Ratio 1.5 Simple Payback yrs 9 Rank Location Existing Condition Recommendation 2 Exterior 25 HPS 250 Watt Magnetic with Manual Switching, Daylight Sensor Replace with 25 LED 108W Module StdElectronic Energy Savings (/yr) $1,984 Installation Cost $25,000 Estimated Life of Measure (yrs) 17 Maintenance Savings (/yr) $46 Breakeven Cost $26,305 Savings-to-Investment Ratio 1.1 Simple Payback yrs 13 Rank Location Existing Condition Recommendation 2 F217 INCAN A Lamp, Std 40W with Manual Switching Replace with FLUOR CFL, Spiral 15 W Energy Savings (/yr) $1 Installation Cost $4 Estimated Life of Measure (yrs) 7 Maintenance Savings (/yr) - Breakeven Cost $4 Savings-to-Investment Ratio 1.0 Simple Payback yrs 6 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 25 Rank Location Existing Condition Recommendation 2 J-5 INCAN A Lamp, Std 100W with Manual Switching Replace with FLUOR CFL, Spiral 26 W Energy Savings (/yr) $1 Installation Cost $4 Estimated Life of Measure (yrs) 7 Maintenance Savings (/yr) - Breakeven Cost $3 Savings-to-Investment Ratio 0.8 Simple Payback yrs 7 Rank Location Existing Condition Recommendation 2 30 28 HID 250 Watt Magnetic with Manual Switching Replace with 28 LED 100W Module StdElectronic and Remove Manual Switching and Add new Occupancy Sensor Energy Savings (/yr) $2,307 Installation Cost $32,085 Estimated Life of Measure (yrs) 15 Maintenance Savings (/yr) $64 Breakeven Cost $26,176 Savings-to-Investment Ratio 0.8 Simple Payback yrs 14 Rank Location Existing Condition Recommendation 2 B5, F216 FLUOR (2) T12 F40T12 40W U-Tube Standard StdElectronic with Manual Switching Replace with FLUOR (2) T8 F32T8 30W U-Tube Energy-Saver Program HighEfficElectronic Energy Savings (/yr) $7 Installation Cost $77 Estimated Life of Measure (yrs) 7 Maintenance Savings (/yr) - Breakeven Cost $44 Savings-to-Investment Ratio 0.6 Simple Payback yrs 11 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 26 A.2.2 Other Electrical Loads Refrigerators are a large portion of electrical loads in buildings such as Woodriver Elementary. If possible, the 21 mini-refrigerators should be removed and a full size refrigerator can be positioned in central location to provide easy access for faculty members. Removing unnecessary units will cut down on energy usage and safe money. Soda machines are large electrical loads when left plugged in continuously. Adding a timer to these units will allow for them to shut off during the night and come back on during the morning to ensure drinks are cool during anticipated times of use. Energy efficient soda machines are available that utilize more efficient refrigeration cycles and better insulation. Woodriver Elementary should contact the vending company to evaluate the possibility of replacing the existing soda machines with similar energy efficient models. A.3 Building Envelope: Recommendations for change A.3.1 Exterior Walls No EEMs are recommended in this area. The walls already have a sufficient amount of insulation and additional insulation is not economical at this time. A.3.2 Foundation and/or Crawlspace No EEMs are recommended in this area because the perimeter of the existing foundation is already insulated. A.3.3 Roofing and Ceiling No EEMS are recommended in this area. Increasing the insulation of the roof is not economical at this time. Rank Location Existing Condition Recommendation 1 Mini Fridge 21 Mini Fridge Remove 21 individual mini- fridges and use a central refrigerator Installation Cost $1 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $699 Breakeven Cost $4,230 Savings-to-Investment Ratio 50 Simple Payback yrs 0 Rank Location Existing Condition Recommendation 1 Soda Machines 3 Soda Machines Replace vending machines with energy efficient models and shut off during unoccupied times Installation Cost $100 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $400 Breakeven Cost $2,418 Savings-to-Investment Ratio 24 Simple Payback yrs 0 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 27 A.3.4 Windows Aluminum windows with single pane glass can be found in some areas throughout Woodriver Elementary. It is economical at this time to replace these windows with insulated vinyl windows with a comparable U-value of 0.22. Single pane windows can be found in areas; F115, F155, F210, F230, and F232. A.3.5 Doors No EEMs are recommended in this area. An upgrade from the existing doors to better insulated doors was considered but is not economical at this time. Rank Location Existing Condition Recommendation 3 Window/Skylight: Single Other Aluminum Glass: Single, Glass Frame: Aluminum, No Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U-Value: 1.30 Solar Heat Gain Coefficient including Window Coverings: 0.52 Replace existing windows with U-0.22 vinyl window Installation Cost $7,530 Estimated Life of Measure (yrs) 20 Energy Savings (/yr) $544 Breakeven Cost $9,427 Savings-to-Investment Ratio 1.3 Simple Payback yrs 14 Rank Location Existing Condition Recommendation 3 Window/Skylight: Single South Aluminum Glass: Single, Glass Frame: Aluminum, No Thermal Break Spacing Between Layers: Half Inch Gas Fill Type: Air Modeled U-Value: 1.30 Solar Heat Gain Coefficient including Window Coverings: 0.52 Replace existing window with U- 0.22 vinyl window Installation Cost $990 Estimated Life of Measure (yrs) 20 Energy Savings (/yr) $68 Breakeven Cost $1,184 Savings-to-Investment Ratio 1.2 Simple Payback yrs 15 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 28 A.4 Building Heating System / Air Conditioning A.4.1 Heating, Heat Distribution, and Ventilation No EEMs are recommended at this time. Energy could be saved by shutting off boilers, but the piping and heat exchanger incorporate Victaulic joints which leak if the system cools down completely. Further investigation into this issue is recommended in order to save boiler standby losses estimated at $8,000/year. Adding a heat recovery system such as a run around heat exchanger can save energy if installed correctly by capturing heat being removed from the building in the form of exhaust air. However, based on field observations the existing ductwork does not provide an easy implementation of this type of system. Further analysis by a design engineer is required to determine the feasibility of this type of energy retrofit. A retrofit to replace the existing boilers with newer high efficiency oil boilers was considered but not recommended at this time. High cost retrofits such as replacing boilers usually come with a larger payback period than most other retrofits. In order to fully determine the feasibility of this type of retrofit:  Further analysis and testing of the boilers needs to be performed to see if the boilers are reaching the end of their life expectancy  The number of remaining years of operation expected for Woodriver Elementary needs to be determined This retrofit would save Woodriver Elementary a significant amount of energy, but is not cost effective as an immediate retrofit unless the existing boilers are soon replaced and the building is expected to stay in operation for longer than the retrofit payback. A.4.2 Air Conditioning No EEMS are recommended in this area because there is no air conditioning system installed in this building. A.4.3 Exhaust Fans No EEMs are recommended in this area because the exhaust fans are already properly controlled in this school. 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, by using an AHU to pressurize the building in very cold weather along with an infra-red camera; the location of significant leaks can be determined and repaired. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 29 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 Window/Skylight: Double South Aluminum Replace existing window with U-0.22 vinyl window $248 $5,226 0.82 21 5 Exterior Door: Metal 1/2 Lite Remove existing door and install standard pre-hung U- 0.16 insulated door, including hardware. $374 $11,305 0.78 30 6 Exterior Door: Metal 1/2 Lite Remove existing door and install standard pre-hung U- 0.16 insulated door, including hardware. $374 $11,305 0.78 30 7 202 Replace with 7 LED (2) 17W Module StdElectronic $30 $963 0.41 32 8 37, 200 Replace with 21 LED (2) 17W Module StdElectronic $82 $2,888 0.36 86 9 29 Replace with LED (2) 17W Module StdElectronic $4 $138 0.35 88 10 F-6 Replace with LED (2) 17W Module StdElectronic $3 $138 0.30 150 11 Lighting - Power Retrofit: Hockey Rink Lights Replace with 16 LED 108W Module StdElectronic $338 $16,000 0.25 52 Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 30 Appendix C Significant Equipment List HVAC Equipment Equipment TTDR Model No. Fuel Type H.P . Estimated Efficiency Notes Boilers (qty:2) Cleaver Brooks CB100-70 #2 Fuel - 80% 2,929 MBTU Input Rating Pump CG-01 AO Smith 7-850121-01-0J Electric 7.5 - 1760 RPM Pump CH-02 Vanguard N VM 5030 Electric 3 - - Pump CH-03 Magnetek 9-39156060 Electric - - 1760 RPM Pump CH-04 Magnetek E-Plus III Electric 5 - 1750 RPM Domestic HW Circ Pump Bell & Gosset - Electric 1/6 - - Domestic HW Circ Pump Bell & Gosset - Electric 1/4 - - AHU-1 SF1 TECO - Electric 25 - 1765 RPM AHU-1 RE1 Toshiba B0054DGF2AD Electric 5 - 1715 RPM AHU-1 RE1 Dayton - Electric 5 - 1740 RPM AHU-2 SF2 Gould-Century G-323411-02 Electric 20 - 1750 RPM AHU-3 SF3 Gould-Century 8-323409-01 Electric 15 - 1750 RPM AHU-3 RE3 Marathon EVF184TTDR7026BFW -F1 Electric 5 - 1740 RPM AHU-4 SF4 Gould-Century 8-328409-01 Electric 15 - 1750 RPM AHU-5 SF5 Team LR93590-1 Electric 1/2 - 1710 Hydronic Heater Type 1 (qty:4) Trane E46A004 - 1/3 0 - 46 MBH Hydronic Heater Type 2 (qty:3) Trane E46A008 - 1/1 2 - 70 MBH Hydronic Heater Type 3 (qty:4) Trane E46A010 - 1/8 - 80 MBH Hydronic Heater Type 4 (qty:1) Trane E46A013 - 1/6 - 110 MBH Plug Loads Equipment Location Manufacturer KWH/YR Cost/YR Head Bolt Heaters Exterior - 17,280 $ 3,110 Full Size Refrigerator/Freezer Varies Varies 7,000 1,260 Laptops Classrooms Varies 6,694 1,205 Vending Machines Hallways Varies 6,000 1,080 Server Tower - Varies 5,260 947 Mini Fridges Classrooms Varies 5,250 945 Smart Boards Classrooms Smart Board 5,021 904 Space Heater - - 2,028 365 Computer Towers Classrooms Varies 1,488 268 Microwaves Classrooms Varies 1,291 232 Computer Monitor Classrooms Varies 1,017 183 Energy Consumption calculated by AkWarm based on wattage, schedule and an electric rate of $ 0.18 per kWh. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 31 Lighting Location Lighting Type Bulb Type Quantity KWH/YR Cost/YR 2, 23, 19, 1, 3, 22, 24, 4, 8, ,5, 7, 18, 20, 6, 10, 15, 9, 16, 11, 14, 17, 21, 25, 26, 27, F151, F155, F154, F212, F229, F232, F237 Fluorescent T5 441 79,300 $ 14,274 F100, F107, F119, F153, F117, F118, F125, F126, F143, F144, F145, F150, F106, F108, F149, F152, F200, Sp. Edu A&B Fluorescent T5 166 29,850 5,373 30 HID 250 watt 28 22,970 4,135 33, F120, F121, 128, 13, F126, F148, 205, 206, 207, 208, G6, B6 Fluorescent T12 40 22,109 3,980 Exterior HPS 250 watt 25 17,557 3,160 Exterior HPS 250 13 9,130 1,643 F103, G2, B2, G1, B1, B3, B4, B5, G3, G4, G5, FT1, T1, T2, FT2, FT5, FT3, FT4 Fluorescent T12 29 8,014 1,443 Exterior HPS 400 watt 5 5,503 991 Exterior HPS 250 16 4,013 722 29, F235 Fluorescent T12 27 3,273 589 F146, F128, F109, F160, F136 Fluorescent T12 8 3,218 579 F146, G6, B6, G2, B2, G1, B1, B3, B4, B5, G3, G4, G5 Fluorescent T12 13 3,034 546 Exterior Incandescent 100 watt 8 2,765 498 G2, G1, G3, G4, G5, FT1, T1, T2, FT2, FT3, FT4, FT5 Fluorescent T12 12 2,732 492 F231 Fluorescent T12 1 1,714 309 F231 Fluorescent T12 4 1,695 305 100 Fluorescent T12 1 1,065 192 Exit Signs LED LED 19 1,057 190 Energy Consumption calculated by AkWarm based on wattage, schedule and an electric rate of $ 0.18 per kWh. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 32 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. Golden Valley Electrical Association Rate Structure: GS-2 General Service Rate Structure (GVEA) Rate Component Unit Charge Customer Charge $30.00 Utility Charge $0.04843 per kWh Cost of Fuel $0.12527 per kWh Regulatory Cost Charge (RCC) $0.000492 per kWh 2010 Average Rate (Woodriver Elementary School) $0.18 per kWh GVEA offers five different rates to its members, depending on the classification of the service provided. The rates are divided into two categories: Residential and General Service (GS). Eighty-five percent of the electric services on GVEA's system are single-family dwellings, classified under the Residential rate. The four General Service rates apply to small and large power users that do not qualify for the Residential rate. The General Service rates break down as follows: GS-1 General Service Services under 50 kilowatts (kW) of demand per billing cycle GS-2(S) Large General Service Secondary Services 50 kW and higher of demand per billing cycle GS-2(P) Large General Service Primary Services at primary voltage GS-3 Industrial Service Services at transmission voltage 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. Energy Audit –Final Report Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 33 Fuel and Purchased Power This charge is based on a combination of forecasted and actual power costs. The monthly charge allows Golden Valley to pass on increases and decreases in fuel and energy purchases to our members. It is calculated quarterly and multiplied by the kilowatt-hours used each month. 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 34 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 AkW arm. 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 35 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 techniq ues 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 36 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 37 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 38 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 39 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 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 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 = 1000 BTU 1 CCF of natural gas = about 1 Therm 1 Pascal (Pa) = 1 inch H2O = 0.363 pounds/square inch (psi) 1 Pascal (Pa) = 0.0025 atmospheres (atm) 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 40 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. CO carbon monoxide CUI Cost Utilization Index CDD Cooling Degree Days CMU Concrete Masonry Unit DDC Direct Digital Control EEM Energy Efficiency Measure EER Energy Efficient Ratio EUI Energy Utilization Index FLOUR Fluorescent Grade The finished ground level adjoining a building at the exterior walls HDD Heating Degree Days HVAC Heating Ventilation Air-Conditioning INCAN Incandescent NPV Net Present Value R-value Thermal resistance measured in TU r- - 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 Reduction of heating or cooling by changing the set point during hours when the building or space is unoccupied 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 Woodriver Elementary Fairbanks, Alaska F:\00-Jobs\2011\2602 F - AHFC Grade Audits\50-100 Doyon Fairbanks Region\50-155 FNSB SD Woodriver Elem\Reports\Final\2012.06.15 Final AHFC Report V2 FAI Woodriver Elementary.Docx 41 Appendix L Building Floor Plan Floor plan provided by FNSBSD. Dimensions are based on field measurements.