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HomeMy WebLinkAboutSEA-AEE-Sitka MEHS Gymnasium 2012-EE Mt Edgecumbe High School Gymnasium (Bldg. 1331) Funded by: Final Report March 2012 Prepared by: Energy Audit Table of Contents Section 1: Executive Summary 2  Section 2: Introduction 6  Section 3: Energy Efficiency Measures 8  Section 4: Description of Systems 14  Section 5: Methodology 16  Appendix A: Energy and Life Cycle Cost Analysis 19   Appendix B: Energy and Utility Data 25  Appendix C: Equipment Data 30  Appendix D: Abbreviations 32  Audit Team The energy audit is performed by Alaska Energy Engineering LLC of Juneau, Alaska. The audit team consists of: Jim Rehfeldt, P.E., Energy Engineer Jack Christiansen, Energy Consultant Brad Campbell, Energy Auditor Loras O’Toole P.E., Mechanical Engineer Will Van Dyken P.E., Electrical Engineer Curt Smit, P.E., Mechanical Engineer Philip Iverson, Construction Estimator Karla Hart, Technical Publications Specialist Jill Carlile, Data Analyst Grayson Carlile, Energy Modeler Acknowledgment and Disclaimer Acknowledgment: This material is based upon work supported by the Department of Energy under Award Number DE-EE0000095. 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. Mt Edgecumbe High School Gymansium (Bldg. 1331) 1 Energy Audit (March 2012) Section 1 Executive Summary An energy audit of the Mt Edgecumbe High School Gym was performed by Alaska Energy Engineering LLC. The investment grade audit was funded by Alaska Housing Finance Corporation (AHFC) to identify opportunities to improve the energy performance of public buildings throughout Alaska. The Mt Edgecumbe High School Gym is a 53,826 square foot building that contains commons, offices, classrooms, restrooms, locker rooms, a weight room, a gym, storage, and mechanical support spaces. Building Assessment The following summarizes our assessment of the building. Envelope The insulation level of the envelope is considerable below current standards for energy efficient buildings. The insulated metal siding has an R-10 insulating value and the bottom 4’ of the east and west gym walls is uninsulated concrete (R-1.5). An R value of 26 is optimal for Sitka’s climate. Siding replacement should include at least 4” of foam insulation. Additional building envelope issues identified include:  Drainage around the west wall is so poor that runoff water is actually running through a portion of the gym. This should be corrected to protect the long-term durability of the building.  The overhead door on the north end of the building is allowing air infiltration at the bottom seal on both ends due to an uneven floor surface. This can be corrected with a different style door seal.  The south gym wall double doors are heavily utilized by students. Because this access does not have an arctic entry feature, the use of these doors results in a large amount of infiltration into the space. We recommend that these doors not be used for routine ingress/egress or an interior arctic entry be added to reduce infiltration.  During the audit the inner stairwell doors were blocked open. This defeats the artic entry benefits they provide, causes high infiltration rates into the building. Energy will be saved if these doors are kept closed.  Exterior doors are in very poor condition. They are uninsulated, and are not thermally broken. Weather stripping is in poor condition on many of the doors and should be replaced.  The tower windows are single pane units, resulting in a significant amount of heat loss at the highest point of the building. These windows should be replaced if the space is to be used or insulated if it is not.  Five external lights were removed from the west gym wall; however, the wire is still protruding and the access hole through the wall has not been filled. The hole should be sealed to prevent moisture infiltration into the wall assembly. Mt Edgecumbe High School Gymansium (Bldg. 1331) 2 Energy Audit (March 2012) Heating System The building is heated by a central boiler plant that supplies hydronic heating water to several campus buildings via underground utilidors. Within the building, circulation pumps CP-14 and CP-15 operate in a lead/standby strategy to circulate heat to the heating units. The heating system cannot be turned off during summer months when the building is unoccupied because the piping experiences multiple leaks when it cools down. A significant amount of temperature stratification exists in the gym due to the high ceiling however the ceiling fans were not operating to move warm air down to the occupied zone. The ceiling fans should be operated when gym ventilation unit AHU-2 is operating. The heating system appears to be in good condition; however, fairly simple improvements can be made to improve its effectiveness and efficiency. These are outlined in Section 3, Energy Efficiency Measures. Ventilation Systems The building has three ventilation systems. AHU-1 serves the classrooms, AHU-2 serves the gym, and MAU-1/EF-18 serves the locker rooms. Ventilation system energy efficiency measures include:  The program schedule for AHU-1 operates the system until 11:00 pm. The schedule should be reduced to reflect that the classrooms are not used after 5:00 pm. Recommendations to optimize ventilation schedules are found in EEM-4.  MAU-1/EF-18 removes 4,020 cfm of conditioned air from the building. The system was originally designed with a heat recovery coil to transfer exhaust heat to the makeup air. The heat recovery coil has been removed. Energy will be saved if the heat recovery coil is repaired or replaced (EEM-10). The remainder of the ventilation system appears to be in good condition. Control System The building has a pneumatic control system for the heating and ventilating systems. The control system does not allow for setback of building temperature during unoccupied periods. This energy saving feature should be repaired. The pneumatic piping has excessive leakage, resulting in an unacceptable amount of run time for the air compressor. System leakage should be reduced (EEM-14). The pneumatic system is outdated and is a liability to the building. Replacing it will provide energy savings through optimal ventilation system control, scheduling, and night setback but this savings will not offset the high cost of replacement. The pneumatic controls limit the EEM opportunities for the building. Mt Edgecumbe High School Gymansium (Bldg. 1331) 3 Energy Audit (March 2012) Lighting Interior lighting consists primarily of T5 fluorescent fixtures in the gym and T8 fluorescent fixtures throughout the remaining spaces with only a few T12. Exterior lighting consists of compact fluorescent and LED lighting and is controlled by photocells. Because the additional heat produced by the T12 fluorescent fixtures is beneficial heat to the building, we recommend that maintenance staff only replace the remaining T12 fixtures with more efficient T8 fixtures as the ballasts fail. Occupancy sensors have been added to the bathroom spaces to reduce lighting energy consumption. They are currently set to turn lights off if there has been no activity in the space for 20 minutes. Energy will be saved if this unoccupied timeframe is reduced to 5 minutes. Summary The overall energy consumption of the Gym is 72 kBtu/sqft. This is higher than other school buildings in Southeast Alaska, which average 66 kBtu/sqft. This higher-than-average energy use rate can be directly attributed to insufficient wall insulation and lack of ventilation system optimization. Energy Efficiency Measures (EEMs) All buildings have opportunities to improve their energy efficiency. The energy audit revealed several opportunities in which an efficiency investment will result in a net reduction in long-term operating costs. Behavioral and Operational EEMs The following EEMs require behavioral and operational changes in the building use. The savings are not readily quantifiable but these EEMs are highly recommended as low-cost opportunities that are a standard of high performance buildings. EEM-1: Weather-strip Doors EEM-2: Remove Ventilation Fans and Insulate EEM-3: Adjust Bathroom Occupancy Sensors Mt Edgecumbe High School Gymansium (Bldg. 1331) 4 Energy Audit (March 2012) High and Medium Priority EEMs The following EEMs are recommended for investment. They are ranked by life cycle savings to investment ratio (SIR). This ranking method places a priority on low cost EEMs which can be immediately funded, generating energy savings to fund higher cost EEMs in the following years. Negative values, in parenthesis, represent savings. 25-Year Life Cycle Cost Analysis Investment Operating Energy Total SIR High Priority EEM-4: Optimize Ventilation Schedules $5,100 $0 ($843,300) ($838,200) 165.4 EEM-5: Turn Off Computers $100 $0 ($6,700) ($6,600) 67.0 EEM-6: Turn Off Cabinet Fan Heaters $200 $0 ($13,100) ($12,900) 65.5 EEM-7: Insulate Tower Windows $2,300 $0 ($128,600) ($126,300) 55.9 EEM-8: Replace Aerators and Showerheads $1,400 $0 ($24,600) ($23,200) 17.6 EEM-9: De-Lamp Vending Machines $100 $0 ($1,600) ($1,500) 16.0 EEM-10: Install Pipe Insulation $3,600 $0 ($54,300) ($50,700) 15.1 EEM-11: Install Heat Recovery MAU-1/EF-18 $35,100 $2,000 ($270,400) ($233,300) 7.6 EEM-12: Insulate Exterior Concrete Walls $63,700 $0 ($234,900) ($171,200) 3.7 Medium Priority EEM-13: Operate Gym Ceiling Fans $3,900 $24,500 ($35,300) ($6,900) 2.8 EEM-14: Convert to Variable Speed Pumping $62,200 $4,100 ($181,000) ($114,700) 2.8 EEM-15: Repair Pneumatic Leaks $2,400 $0 ($3,400) ($1,000) 1.4 EEM-16: Upgrade Motors $2,600 $0 ($3,500) ($900) 1.3 Totals* $182,700 $30,600 ($1,800,700) ($1,587,400) 9.7 *The analysis is based on each EEM being independent of the others. While it is likely that some EEMs are interrelated, an isolated analysis is used to demonstrate the economics because the audit team is not able to predict which EEMs an Owner may choose to implement. If several EEMs are implemented, the resulting energy savings is likely to differ from the sum of each EEM projection. Summary The energy audit revealed numerous opportunities for improving the energy performance of the building. It is recommended that the behavioral and high priority EEMs be implemented now to generate energy savings from which to fund the medium priority EEMs. Another avenue to consider is to borrow money from AHFCs revolving loan fund for public buildings. AHFC will loan money for energy improvements under terms that allow for paying back the money from the energy savings. More information on this option can be found online at http://www.ahfc.us/loans/akeerlf_loan.cfm. Mt Edgecumbe High School Gymansium (Bldg. 1331) 5 Energy Audit (March 2012) Section 2 Introduction This report presents the findings of an energy audit of the Mt Edgecumbe High School Gym, which is located in Sitka, Alaska. The purpose of this investment grade energy audit is to evaluate the infrastructure and its subsequent energy performance to identify applicable energy efficiencies measures (EEMs). The energy audit report contains the following sections:  Introduction: Building use and energy consumption.  Energy Efficiency Measures: Priority ranking of the EEMs with a description, energy analysis, and life cycle cost analysis.  Description of Systems: Background description of the building energy systems.  Methodology: Basis for how construction and maintenance cost estimates are derived and the economic and energy factors used for the analysis. BUILDING USE Mt Edgecumbe High School Gym is a 53,826 square foot building that contains commons, offices, classrooms, restrooms, locker rooms, a weight room, a gym, storage, and mechanical support spaces. The building is utilized by 400 students from mid-August through early May, with a 3-week break for Christmas. Building History  1940 – Original Construction  1984 – Facility Renovation  1996 – Mechanical Upgrades  2001 – Roofing Replacement  2012 – Lighting Upgrades Mt Edgecumbe High School Gymansium (Bldg. 1331) 6 Energy Audit (March 2012) Energy Consumption The building energy sources are fuel oil for heating loads and electricity for all other loads. The following table shows annual energy use and cost. Annual Energy Consumption and Cost Source Consumption Cost Energy, MMBtu Electricity 380,390 kWh $40,900 1,300 33% Fuel Oil* 18,861 Gallons $65,600 2,600 67% Totals $106,500 3,900 100% Electricity This shows electrical energy use from 2008 to 2011, during which time the electrical consumption has been steady. The effective cost—energy costs plus demand charges—is 10.8¢ per kWh. Fuel Oil* The building is heated by a central fuel-oil boiler system that provides heat to multiple campus buildings via a utilidor system. The heat is not metered and was calculated to be equivalent to 18,861 gallons during a recent heating system analysis. Cost of Heat Comparison This chart shows a comparison of the current cost of fuel oil heat, electric resistance heat, and heat pump heat. The comparison is based on a fuel oil conversion efficiency of 70% and an electric boiler conversion efficiency of 95%. Electric heat is less expensive than fuel oil heat. Mt Edgecumbe High School Gymansium (Bldg. 1331) 7 Energy Audit (March 2012) Section 3 Energy Efficiency Measures The following energy efficiency measures (EEMs) were identified during the energy audit. The EEMs are priority ranked and, where applicable, subjected to energy and life cycle cost analysis. Appendix A contains the energy and life cycle cost analysis spreadsheets. The EEMs are grouped into the following prioritized categories:  Behavioral or Operational: EEMs that require minimal capital investment but require operational or behavioral changes. The EEMs provide a life cycle savings but an analysis is not performed because the guaranteed energy savings is difficult quantify.  High Priority: EEMs that require a small capital investment and offer a life cycle savings. Also included in this category are higher cost EEMs that offer significant life cycle savings.  Medium Priority: EEMs that require a significant capital investment to provide a life cycle savings. Many medium priority EEMs provide a high life cycle savings and offer substantial incentive to increase investment in building energy efficiency.  Low Priority: EEMs that will save energy but do not provide a life cycle savings. BEHAVIORAL OR OPERATIONAL The following EEMs are recommended for implementation. They require behavioral or operational changes that can occur with minimal investment to achieve immediate savings. These EEMs are not easily quantified by analysis because they cannot be accurately predicted. They are recommended because they offer a life cycle savings, represent good practice, and are accepted features of high performance buildings. EEM-1: Weather-strip Doors Purpose: The exterior doors do not seal well and are missing weather stripping in places. Energy will be saved if all doors are properly weather-stripped to reduce infiltration and adjusted to ensure they close tightly. Scope: Replace weather stripping on exterior doors and adjust as necessary to ensure complete closure. EEM-2: Remove Ventilation Fans and Insulate Purpose: Two 16” diameter ventilation fans in the exterior wall of Room 205/206 are no longer in use. Energy will be saved if these fans are removed and the wall cavity properly sealed and insulated. Scope: Remove the two unused fans and properly seal and insulate the wall cavity. Mt Edgecumbe High School Gymansium (Bldg. 1331) 8 Energy Audit (March 2012) EEM-3: Adjust Bathroom Occupancy Sensors Purpose: Occupancy sensors have been added to the bathroom spaces to reduce lighting energy consumption. They are currently set to turn lights off if there has been no activity in the space for 20 minutes. Energy will be saved if this unoccupied timeframe is reduced to 5 minutes. Scope: Set the bathroom occupancy sensors to turn the lights off after 5 minutes without activity. HIGH PRIORITY The following EEMs are recommended for implementation because they are low cost measures that have a high savings to investment ratio. The EEMs are listed from highest to lowest priority. Negative values, in parenthesis, represent savings. EEM-4: Optimize Ventilation Schedules Purpose: The classroom ventilation system is scheduled to operate from 6:00 am to 11:00 pm. It was reported that the classrooms are not used after 5:00 pm. Energy will be saved if the schedule is changed to operate from 6:00 am to 5:00 pm. The gym ventilation system is scheduled to operate from 6:00 am to 11:00 pm. It was reported that the gym closes at 10:00 pm. Energy will be saved if the schedule is changed to operate from 6:00 am to 10:00 pm. The locker ventilation system is currently operating continuously due to failure of its program clock. Energy will be saved if the program clock is repaired and the schedule set to operate it 6:00 am to 10:00 pm. Scope: Modify the classroom AHU-1 schedule to operate Monday-Friday from 6:00 am to 5:00 pm. Modify the gym AHU-2 and locker MAU-1/EF-18 schedule to operate Monday- Friday from 6:00 am to 10:00 pm. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($30,420) ($30,420) $5,100 $0 ($843,300) ($838,200) 165.4 EEM-5: Turn Off Computers Purpose: There are 53 computers in the building. Of those, 25 reportedly enter sleep mode at night rather than being turned off. MEHS has a policy to shut down computers when not in use. Energy will be saved if these computers are shut down when not in use. Scope: Shut down all computers at the end of each school day. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($340) ($340) $100 $0 ($6,700) ($6,600) 67.0 Mt Edgecumbe High School Gymansium (Bldg. 1331) 9 Energy Audit (March 2012) EEM-6: Turn Off Cabinet Fan Heaters Purpose: The gym has six cabinet fan heaters that are not needed to heat the building. The coils in these unit heaters are continuously hot and convect heat to the gym space. Some of the heat loss may be useful, but a large percentage is not. Energy will be saved if water flow through the units is turned off. Scope: Close the isolation valves on six unused cabinet fan heaters in the gym. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($460) ($460) $200 $0 ($13,100) ($12,900) 65.5 EEM-7: Insulate Tower Windows Purpose: The tower has inefficient single pane windows. Energy will be saved if these windows are covered with rigid insulation. Scope: Fill the window frames with 4” of rigid insulation. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($4,540) ($4,540) $2,300 $0 ($128,600) ($126,300) 55.9 EEM-8: Replace Aerators and Showerheads Purpose: Energy and water will be saved by replacing the lavatory aerators and showerheads with low-flow models. Scope: Replace lavatory aerators and showers with water-conserving fixtures. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($870) ($870) $1,400 $0 ($24,600) ($23,200) 17.6 EEM-9: De-Lamp Vending Machines Purpose: Lamps for soft drink coolers run continuously and are not necessary. Energy will be saved if these lamps are removed. Scope: Remove lamps from soft drink coolers in the concession space and in the gym. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($80) ($80) $100 $0 ($1,600) ($1,500) 16.0 Mt Edgecumbe High School Gymansium (Bldg. 1331) 10 Energy Audit (March 2012) EEM-10: Install Pipe Insulation Purpose: Several sections of large heating pipe are uninsulated. Energy will be saved if these sections of piping are optimally insulated. Scope: Install pipe insulation in the following locations: - 80’ of 6” pipe connecting the pump room to the utilidor. - 20’ of 6” pipe above the pump room. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($1,910) ($1,910) $3,600 $0 ($54,300) ($50,700) 15.1 EEM-11: Install Heat Recovery on MAU-1/EF-18 Purpose: MAU-1 supplies outside air to the locker rooms while EF-18 exhausts the rooms. There was a heat recovery coil between the two air streams, but it has been removed. Energy will be saved if the heat recovery coil is replaced. Scope: Replace the heat recovery coil for MAU-1 and EF-18. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $120 ($9,540) ($9,420) $35,100 $2,000 ($270,400) ($233,300) 7.6 EEM-12: Insulate Exterior Concrete Walls Purpose: The bottom 4’ of the east and west gym walls is uninsulated concrete. This wall section has an R-1.5 insulating rating; R-26 is optimal for today’s energy costs. Energy will be saved if 4” of rigid insulation and siding is applied to this section of the exterior wall. Scope: Apply 4” of rigid insulation and metal panel siding material over the uninsulated east and west concrete walls. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($8,290) ($8,290) $63,700 $0 ($234,900) ($171,200) 3.7 Mt Edgecumbe High School Gymansium (Bldg. 1331) 11 Energy Audit (March 2012) MEDIUM PRIORITY Medium priority EEMs will require planning and a higher level of investment. They are recommended because they offer a life cycle savings. The EEMs are listed from highest to lowest priority. Negative values, in parenthesis, represent savings. EEM-13: Operate Gym Ceiling Fans Purpose: The gym has ceiling fans that will push heated air back down to the occupied level of the building. Energy will be saved if the ceiling fans are operated continuously to reduce temperature stratification in the room. Scope: Repair ceiling fan controls and operate the ceiling fans continuously to reduce temperature stratification. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $1,440 ($1,240) $200 $3,900 $24,500 ($35,300) ($6,900) 2.8 EEM-14: Convert to Variable Speed Pumping Purpose: The heating system uses constant speed pumps to supply hydronic heating water to the heating units. Energy will be saved if the system is converted to variable flow. Scope: Install VFDs on the heating pump and controls to modulate the pumps to maintain a pressure differential across the heating mains. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $240 ($9,210) ($8,970) $62,200 $4,100 ($181,000) ($114,700) 2.8 EEM-15: Repair Pneumatic Control System Air Leaks Purpose: Excessive air leakage of the pneumatic control system is resulting in an unacceptable amount of run time on the air compressor. The 1 HP air compressor motor is currently cycling on for three minutes and then off for only minutes minutes before restarting. System pressure is being controlled from 75 psi to 90 psi. In addition to the large energy demand this is creating, it is significantly shortening the life of the air compressor unit. Scope: Repair pneumatic control system air leaks Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($170) ($170) $2,400 $0 ($3,400) ($1,000) 1.4 Mt Edgecumbe High School Gymansium (Bldg. 1331) 12 Energy Audit (March 2012) EEM-16: Upgrade Motors Purpose: There are two motors that have efficiency below current standards. Energy will be saved if the motors are upgraded to NEMA Premium efficiency. They are: - MUA-1 3 HP - EF-18 3 HP Scope: Replace identified motors with premium efficiency motors. LOW PRIORITY Low priority EEMs do not offer a life cycle energy savings and are not recommended. EEM-17: Upgrade to a DDC Control System Purpose: The pneumatic control system outdated and is a liability to the building. Energy will be saved if the controls are updated with DDC controls that allow more sophisticated ventilation controls and night setback. Scope: Replace the pneumatic control system with a DDC control system. Replacing the control system will provide energy savings through optimal ventilation system control, scheduling, and night setback but this savings will not offset the high cost of replacement. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($180) ($180) $2,600 $0 ($3,500) ($900) 1.3 Mt Edgecumbe High School Gymansium (Bldg. 1331) 13 Energy Audit (March 2012) Section 4 Description of Systems ENERGY SYSTEMS This section provides a general description of the building systems. Energy conservation opportunities are addressed in Section 3, Energy Efficiency Measures. Building Envelope R-value Component Description (inside to outside) Existing Optimal Upper Exterior Wall T & G, 6” metal stud, R-19 batt insulation, metal siding R-10 R-26 Lower Exterior Wall 12” concrete wall – uninsulated, 4’ high R-1.5 R-26 Roof 7” foam insulation with EPDM membrane R-35 R-46 Floor 4” slab on grade - uninsulated R-10 R-10 Foundation 8” concrete stem wall R-10 R-20 Windows Double pane aluminum frame windows R-1.5 R-5 Doors Steel doors w/ non-thermally broken frames R-1.5 R-5 Heating System The building is heated by a central boiler system that distributes heat to multiple campus buildings, including the gym, via utilidors. Heating water is circulated to the building heating units by two pumps located in the mechanical equipment space. Mt Edgecumbe High School Gymansium (Bldg. 1331) 14 Energy Audit (March 2012) Ventilation Systems Area Fan System Description Classrooms AHU-1 6,950 cfm 5 hp constant volume air handling unit consisting of a heating coil, mixing box, filter section, supply fan, and return fan Gym AHU-2 12,000 cfm 5 hp constant volume air handling unit consisting of a heating coil, mixing box, filter section, supply fan, and return fan Gym RF-1 6,950 cfm 2 hp constant volume return fan serving AHU-1 Classrooms MUA-1 3,455 cfm 3 hp constant volume exhaust fan Restrooms EF-16 920 cfm ¼ hp constant volume exhaust fan Laundry Room EF-17 320 cfm 1/6 hp constant volume exhaust fan Locker Rooms EF-18 4,020 cfm 3 hp constant volume exhaust fan Domestic Hot Water System Domestic hot water is provided by the central boiler system and circulated throughout the gym via a circulation pump located in the mechanical equipment space Automatic Control System The gym has a basic DDC system for the control of AHU-1 and AHU-2 and pneumatic controls of all other systems. Lighting Interior lighting consists primarily of T5 fluorescent fixtures in the gym and T8 fluorescent fixtures throughout the remaining spaces with only a few T12 fixtures remaining. Exterior lighting consists of compact fluorescent and LED lighting and is controlled by photocells. Because the additional heat produced by the T12 fluorescent fixtures is beneficial within the building envelope in the climate of Sitka, it is recommended that maintenance staff only replace the remaining T12 fixtures with more efficient T8 fixtures as the ballasts fail. Electric Equipment Equipment for food preparation is located in the lounge area. Mt Edgecumbe High School Gymansium (Bldg. 1331) 15 Energy Audit (March 2012) Section 5 Methodology Information for the energy audit was gathered through on-site observations, review of construction documents, and interviews with operation and maintenance personnel. The EEMs are evaluated using energy and life cycle cost analyses and are priority ranked for implementation. Energy Efficiency Measures Energy efficiency measures are identified by evaluating the building’s energy systems and comparing them to systems in modern, high performance buildings. The process for identifying the EEMs acknowledges the realities of an existing building that was constructed when energy costs were much lower. Many of the opportunities used in modern high performance buildings—highly insulated envelopes, variable capacity mechanical systems, heat pumps, daylighting, lighting controls, etc.— simply cannot be economically incorporated into an existing building. The EEMs represent practical measures to improve the energy efficiency of the buildings, taking into account the realities of limited budgets. If a future major renovation project occurs, additional EEMs common to high performance buildings should be incorporated. Life Cycle Cost Analysis The EEMs are evaluated using life cycle cost analysis which determines if an energy efficiency investment will provide a savings over a 25-year life. The analysis incorporates construction, replacement, maintenance, repair, and energy costs to determine the total cost over the life of the EEM. Future maintenance and energy cash flows are discounted to present worth using escalation factors for general inflation, energy inflation, and the value of money. The methodology is based on the National Institute of Standards and Technology (NIST) Handbook 135 – Life Cycle Cost Analysis. Life cycle cost analysis is preferred to simple payback for facilities that have long—often perpetual— service lives. Simple payback, which compares construction cost and present energy cost, is reasonable for short time periods of 2-4 years, but yields below optimal results over longer periods because it does not properly account for the time value of money or inflationary effects on operating budgets. Accounting for energy inflation and the time value of money properly sums the true cost of facility ownership and seeks to minimize the life cycle cost. Construction Costs The cost estimates are derived based on a preliminary understanding of the scope of each EEM as gathered during the walk-through audit. The construction costs for in-house labor are $60 per hour for work typically performed by maintenance staff and $110 per hour for contract labor. The cost estimate assumes the work will be performed as part of a larger renovation or energy efficiency upgrade project. When implementing EEMs, the cost estimate should be revisited once the scope and preferred method of performing the work has been determined. It is possible some EEMs will not provide a life cycle savings when the scope is finalized. Mt Edgecumbe High School Gymansium (Bldg. 1331) 16 Energy Audit (March 2012) Maintenance Costs Maintenance costs are based on in-house or contract labor using historical maintenance efforts and industry standards. Maintenance costs over the 25-year life of each EEM are included in the life cycle cost calculation spreadsheets and represent the level of effort to maintain the systems. Energy Analysis The energy performance of an EEM is evaluated within the operating parameters of the building. A comprehensive energy audit would rely on a computer model of the building to integrate building energy systems and evaluate the energy savings of each EEM. This investment grade audit does not utilize a computer model, so energy savings are calculated with factors that account for the dynamic operation of the building. Energy savings and costs are estimated for the 25-year life of the EEM using appropriate factors for energy inflation. Prioritization Each EEM is prioritized based on the life cycle savings to investment ratio (SIR) using the following formula: Prioritization Factor = Life Cycle Savings / Capital Costs This approach factor puts significant weight on the capital cost of an EEM, making lower cost EEMs more favorable. Economic Factors The following economic factors are significant to the findings. Nominal Interest Rate: This is the nominal rate of return on an investment without regard to inflation. The analysis uses a rate of 5%. Inflation Rate: This is the average inflationary change in prices over time. The analysis uses an inflation rate of 2%. Economic Period: The analysis is based on a 25-year economic period with construction beginning in 2010. Fuel Oil Fuel oil is currently supplied at a price of $3.48 per gallon. Fuel oil inflation historically averaged 6% per year prior to the rapid escalation and de-escalation of prices over the past five years. The analysis assumes the fuel oil inflation will once again continue to inflate at 6% per year. Electricity Electricity is supplied by the CBS Electric Department. Power generation facilities include Blue Lake Hydro, Green Lake Hydro, and the Jarvis Street diesel plant. In 2008, the hydroelectric plants generated 97.6% of the electricity with diesel supplementation of the remaining amount. The building is billed under the General Services Rate, which charges for both electrical consumption (kWh) and peak electric demand (kW). Electrical consumption is the amount of energy consumed and electric demand is the rate of consumption. Electric demand is determined by averaging demand over a continuously sliding fifteen-minute window. The highest fifteen-minute average during the billing period determines the peak demand. The following table lists the current electric charges: Mt Edgecumbe High School Gymansium (Bldg. 1331) 17 Energy Audit (March 2012) General Services Rate Monthly Charge Rate Energy Charge per kWh First 500 kWh 15.52¢ 501 to 10,000 kWh 10.38¢ 10,001 to 100,000 kWh 9.85¢ Over 100,000 kWh 8.85¢ Demand Charge per kW First 25 kW No charge Over 25 kW $3.90 Over recent history, Sitka’s electricity inflation has been low, lagging general inflation. Even the diesel supplementation of recent years has not resulted in a rate increase. To reduce diesel supplementation, planning and preliminary design work is in progress to expand Blue Lake Hydro to its maximum capacity. That expansion will include raising the dam by as much as 83 feet, increasing power production of Blue Lake by over 50%. The Blue Lake project will be funded by 30-year bonds at market rate. The utility’s existing debt will be refinanced so the Blue Lake expansion will have a limited impact on rates over the next 20 years. However it is prudent to plan for nominal electric inflation of 1% per year. Even with the Blue Lake expansion, electric heating loads are likely to continue to place demands on the hydroelectric generation facilities. Energy balance reports for Southeast Alaska communities show that heating loads are 175% greater than the non-heating load. While most of the heating load is currently met with fuel oil, only a small percentage of this large potential load needs to convert to electricity to place demands on the electric grid. In essence, future electricity prices may be tied to fuel oil inflation. The life cycle cost analysis uses an electric inflation of 1.5%, which is higher than current predictions, to account for the impacts of future fuel oil to electric heat conversions. Summary The following table summarizes the energy and economic factors used in the analysis. Summary of Economic and Energy Factors Factor Rate or Cost Factor Rate or Cost Nominal Discount Rate 5% Electricity $0.108/kwh General Inflation Rate 2% Electricity Inflation 2% Fuel Oil Cost (2012) $3.48/gal Fuel Oil Inflation 6% Mt Edgecumbe High School Gymansium (Bldg. 1331) 18 Energy Audit (March 2012) Appendix A Energy and Life Cycle Cost Analysis Mt Edgecumbe High School Gymansium (Bldg. 1331) 19 Energy Audit (March 2012) Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis 25200 Amalga Harbor Road Tel/Fax: 907.789.1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt Edgecumbe High School Gymnasium (Bldg. 1331) Basis Economic Study Period (years) 25 Nominal Discount Rate 5%General Inflation 2% Energy 2011 $/gal Fuel Inflation 2012 $/gal Fuel Oil $3.48 6% $3.69 Electricity $/kWh (2011)$/kW (2011)Inflation $/kWh (2012)$/kW (2012) w/ Demand Charges $0.099 $3.90 3% $0.101 $4.02 w/o Demand Charges $0.108 -3% $0.111 - EEM-4: Optimize Ventilation Schedules Energy Analysis Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh AHU-1 Existing -6,950 1.55 55%-3 89%-3 3,060 -7,904 Optimized 6,950 1.55 55%3 89%3 1,620 4,184 R-1 Existing -6,950 0.50 55%-1 89%-1 3,060 -2,550 Optimized 6,950 0.50 55%1 89%1 1,620 1,350 AHU-2 Existing -12,000 1.00 55%-3 91%-3 4,590 -12,916 Optimized 12,000 1.00 55%3 91%3 4,320 12,157 MAU-1 Existing -4,020 2.00 55%-2 89%-2 8,760 -16,887 Optimized 4,020 2.00 55%2 89%2 4,320 8,328 EF-18 Existing -4,020 1.50 50%-2 89%-2 8,760 -13,932 Optimized 4,020 1.50 50%2 89%2 4,320 6,871 0 -21,300 Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons AHU-1 Existing -6,950 60 70 -75 3,060 -229,684 68%-2,439 Optimized 6,950 60 70 75 1,620 121,597 68%1,291 AHU-2 Existing -12,000 60 70 -130 4,590 -594,864 68%-6,316 Optimized 12,000 60 70 130 4,320 559,872 68%5,945 MAU-1 Existing -4,020 40 70 -130 8,760 -1,140,972 68% -12,115 Optimized 4,020 40 70 130 4,320 562,671 68%5,974 -721,380 -7,660 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Change program clock for AHU-1 and AHU-2 0 1 hr $60 $60 Replace MAU-1/EF-18 program clock 0 1 LS $5,000 $5,000 Energy Costs Electric Energy 1 - 25 -21,300 kWh $0.101 ($42,480) Fuel Oil 1 - 25 -7,660 gal $3.69 ($800,866) Net Present Worth ($838,300) Mt Edgecumbe High School Gymansium (Bldg. 1331) 20 Energy Audit (March 2012) Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis 25200 Amalga Harbor Road Tel/Fax: 907.789.1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt Edgecumbe High School Gymnasium (Bldg. 1331) EEM-5: Turn Off Computers Energy Analysis Equipment Number Watts Hours kWh Workstation 25 -20 6,680 -3,340 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Employee instruction 0 1 hr $100 $100 Energy Costs Electric Energy 1 - 25 -3,340 kWh $0.101 ($6,661) Net Present Worth ($6,600) EEM-6: Turn Off Cabinet Fan Heaters Energy Analysis Loss, BTUH Number Factor Loss, kBTU Boiler Effic Fuel, gals -1,500 6 15% -11,826 70% -125 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Close isolation valves 0 4 hrs $60 $240 Energy Costs Fuel Oil 1 - 25 -125 gal $3.69 ($13,085) Net Present Worth ($12,800) EEM-7: Insulate Tower Windows Energy Analysis Area R,exist R,new ΔT MBH kBtu η boiler Gallons 452 1 20 15 -13.2 -115,816 68% -1,230 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install window insulation 0 452 sqft $5 $2,260 Energy Costs Fuel Oil 1 - 25 -1,230 gal $3.69 ($128,577) Net Present Worth ($126,300) EEM-8: Replace Aerators and Showerheads Energy Analysis η boiler 68% Fixture Existing Proposed Uses/day Days Water,Gals % HW kBTU Gallons Showerhead 20.0 10.0 10 270 -27,000 80% -14,412 -153 Lavatories 0.3 0.2 300 270 -14,580 80% -7,782 -83 -41,580 -236 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Replace lavatory aerators 0 21 ea $35 $735 Replace showerhead 0 18 ea $35 $630 Energy Costs Fuel Oil 1 - 25 -236 gal $3.69 ($24,639) Net Present Worth ($23,300) Gallons per Use Mt Edgecumbe High School Gymansium (Bldg. 1331) 21 Energy Audit (March 2012) Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis 25200 Amalga Harbor Road Tel/Fax: 907.789.1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt Edgecumbe High School Gymnasium (Bldg. 1331) EEM-9: De-Lamp Vending Machines Energy Analysis Number Watts, exist Watts,new kW kWh 2 36 0 -0.1 -631 1 20 0 -0.02 -171 -802 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Remove vending machine lamps 0 1 LS $100 $100 Energy Costs Electric Energy 1 - 25 -802 kWh $0.101 ($1,599) Net Present Worth ($1,500) EEM-10: Install Pipe Insulation Energy Analysis Service Size Length Bare BTUH Insul BTUH Factor kBtu η boiler Gallons Heating 6.00 100 402 30 15% -48,881 68%-519 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Pipe Insulation 6"0 100 lnft $20 $2,000 Estimating contingency 0 15%$300 Overhead & profit 0 30%$690 Design fees 0 10%$299 Project management 0 8%$263 Energy Costs Fuel Oil 1 - 25 -519 gal $3.69 ($54,267) Net Present Worth ($50,700) EEM-11: Install Heat Recovery on MAU-1/EF-18 Energy Analysis Case CFM Tosa Tma MBH Hours kBtu η boiler Gallons Existing -3,750 40 70 -122 4,320 -524,880 68%-5,573 Proposed 3,750 55 70 61 4,320 262,440 68%2,787 -2,787 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install heat recovery coil 0 1 LS $25,000 $25,000 Overhead & profit 0 30%$7,500 Project management 0 8%$2,600 Annual Costs Clean coil 1 - 25 2 hrs $60.00 $2,043 Energy Costs Fuel Oil 1 - 25 -2,787 gal $3.42 ($270,426) Net Present Worth ($233,300) Mt Edgecumbe High School Gymansium (Bldg. 1331) 22 Energy Audit (March 2012) Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis 25200 Amalga Harbor Road Tel/Fax: 907.789.1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt Edgecumbe High School Gymnasium (Bldg. 1331) EEM-12: Insulate Exterior Concrete Walls Energy Analysis Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons Wall 1,771 2 22 30 -24.2 -211,554 68%-2,246 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install wall insulation 0 1,771 sqft $5 $8,855 Metal siding 0 1,771 sqft $15 $26,565 Z-channel 0 443 lnft $1 $443 Estimating contingency 0 15%$5,379 Overhead & profit 0 30% $12,373 Design fees 0 10%$5,361 Project management 0 8%$4,718 Energy Costs Fuel Oil 1 - 25 -2,246 gal $3.69 ($234,864) Net Present Worth ($171,200) EEM-13: Operate Gym Ceiling Fans Energy Analysis Heat Loss Component Area R,exist ΔT MBH kBtu η boiler Gallons Wall -17,000 10 26 -44.2 -387,192 68% -4,111 Wall 17,000 10 25 42.5 372,300 68% 3,953 Roof -40,500 42 27 -26.0 -228,073 68% -2,422 Roof 40,500 42 25 24.1 211,179 68% 2,242 -3.6 -31,786 -338 Fan Energy Number watts kW Hours kWh 12 150 2 8,760 15,768 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Repair ceiling fan controls 0 1 ea $2,500 $2,500 Overhead & profit 0 30%$750 Design fees 0 10%$325 Project management 0 8%$286 Annual Costs Ceiling fan maintenance 1 - 25 24 ea $60.00 $24,519 Energy Costs Electric Energy 1 - 25 15,768 kWh $0.101 $31,447 Electric Demand 1 - 25 22 kW $4.02 $1,706 Fuel Oil 1 - 25 -338 gal $3.69 ($35,289) Net Present Worth $26,200 Mt Edgecumbe High School Gymansium (Bldg. 1331) 23 Energy Audit (March 2012) Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis 25200 Amalga Harbor Road Tel/Fax: 907.789.1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt Edgecumbe High School Gymnasium (Bldg. 1331) EEM-14: Convert to Variable Speed Pumping Energy Analysis Case GMP Head η pump BHP η motor kW Hours kWh Existing -534 72 85% -15.3 93% -12.3 8,760 -107,525 Proposed 200 30 85% 2.4 93% 1.9 8,760 16,780 -10.4 -90,745 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install VFD 0 2 ea $10,000 $20,000 Controls 0 1 ea $15,000 $15,000 Estimating contingency 0 15%$5,250 Overhead & profit 0 30% $12,075 Design fees 0 10%$5,233 Project management 0 8%$4,605 Annual Costs VFD and control maintenance 1 - 25 4 hrs $60.00 $4,086 Energy Costs Electric Energy 1 - 25 -90,745 kWh $0.101 ($180,979) Net Present Worth ($114,700) EEM-15: Repair Pneumatic Leaks Energy Analysis Case BHP η motor kW Hours kWh Existing -0.8 89% -0.7 5,256 -3,524 Proposed 0.8 89% 0.7 2,920 1,958 0.0 -1,566 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Repair pneumatic leaks 0 40 hrs $60 $2,400 Energy Costs Electric Energy (Effective Cost)1 - 25 -1,566 kWh $0.111 ($3,425) Net Present Worth ($1,000) EEM-16: Upgrade Motors Energy Analysis Equip Number HP ηold ηnew kW Hours kWh MAU-1 1 3 81.4% 89.5% -0.18 4,320 -783 EF-18 1 3 81.4% 89.5% -0.18 4,320 -783 -0.4 -1,566 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs HP Replace motor 3 0 2 LS 1,290 $2,580 Energy Costs Electric Energy 1 - 25 -1,566 kWh $0.101 ($3,124) Electric Demand 1 - 25 -4 kW $4.02 ($344) Net Present Worth ($900) Mt Edgecumbe High School Gymansium (Bldg. 1331) 24 Energy Audit (March 2012) Appendix B Energy and Utility Data Mt Edgecumbe High School Gymansium (Bldg. 1331) 25 Energy Audit (March 2012) Alaska Energy Engineering LLC Billing Data 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt. Edgecumbe Gym Classroom ELECTRIC RATE Electricity ($ / kWh )Demand ( $ / kW ) 1-500 kWh $0.1552 First 25 kW $0.00 501-10,000 kWh $0.1038 Over 25 kW $3.90 10,001-100,000 kWh $0.0985 >100,000 kWh $0.0885 ELECTRICAL CONSUMPTION AND DEMAND kWh kW kWh kW kWh kW kWh kW Jan 33,360 96 27,120 88 33,120 88 35,680 88 32,320 Feb 38,480 94 40,080 120 42,800 88 42,240 96 40,900 Mar 31,600 88 33,600 88 41,600 95 34,880 80 35,420 Apr 46,560 84 38,720 80 37,120 72 39,680 80 40,520 May 22,880 70 27,680 72 30,720 72 20,800 74 25,520 Jun 21,040 64 15,760 62 21,760 60 12,240 48 17,700 Jul 22,560 72 21,440 69 11,600 60 13,440 38 17,260 Aug 19,440 72 22,800 61 33,920 68 18,240 66 23,600 Sep 36,000 83 37,680 120 36,400 80 33,600 72 35,920 Oct 36,560 120 39,360 91 34,040 88 37,840 80 36,950 Nov 40,080 88 43,360 96 40,400 88 36,960 80 40,200 Dec 34,160 80 34,720 96 34,720 88 32,720 90 34,080 Total 382,720 382,320 398,200 358,320 380,390 Average 31,893 84 31,860 87 33,183 79 29,860 74 31,699 Load Factor 51.9% 50.2% 57.6% 55.0% 81 ELECTRIC BILLING DETAILS Month Energy Demand Total Energy Demand Total % Change Jan $3,341 $246 $3,587 $3,593 $246 $3,839 7.0% Feb $4,295 $246 $4,540 $4,239 $277 $4,516 -0.5% Mar $4,176 $273 $4,449 $3,514 $215 $3,729 -16.2% Apr $3,735 $183 $3,918 $3,987 $215 $4,202 7.2% May $3,105 $183 $3,288 $2,128 $191 $2,319 -29.5% Jun $2,222 $137 $2,359 $1,284 $90 $1,374 -41.7% Jul $1,221 $137 $1,358 $1,403 $51 $1,453 7.0% Aug $3,420 $168 $3,588 $1,875 $160 $2,035 -43.3% Sep $3,664 $215 $3,879 $3,388 $183 $3,572 -7.9% Oct $3,432 $246 $3,677 $3,806 $215 $4,020 9.3% Nov $4,058 $246 $4,304 $3,719 $215 $3,934 -8.6% Dec $3,499 $246 $3,744 $3,302 $254 $3,555 -5.1% Total $ 40,167 $ 2,523 $ 42,690 $ 36,239 $ 2,309 $ 38,548 -9.7% Average $ 3,347 $ 210 $ 3,558 $ 3,020 $ 192 $ 3,212 -9.7% Cost ($/kWh) $0.107 94% 6% $0.108 0.3% 2010 2011 Electrical costs are based on the current electric rates. 2011 General Service Month 2008 2009 2010 Average Mt Edgecumbe High School Gymansium (Bldg. 1331) 26 Energy Audit (March 2012) Alaska Energy Engineering LLC Annual Electric Consumption 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt. Edgecumbe Gym Classroom 0 0 0 0 0 0 0 0 0 0 0 0 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Use (kWh)Month of the Year Electric Use History 2008 2009 2010 2011 0 20 40 60 80 100 120 140 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Demand (kW)Month of the Year Electric Demand History 2008 2009 2010 2011 Mt Edgecumbe High School Gymansium (Bldg. 1331) 27 Energy Audit (March 2012) Alaska Energy Engineering LLC Electric Cost 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt. Edgecumbe Gym Classroom 2011 $ 0 $ 500 $ 1,000 $ 1,500 $ 2,000 $ 2,500 $ 3,000 $ 3,500 $ 4,000 $ 4,500 $ 5,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Cost (USD)Month of the Year Electric Cost Breakdown 2011 Electric Use (kWh) Costs Electric Demand (kW) Costs 0 20 40 60 80 100 120 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Electric Demand (kW)Electric Use (kWh)Month of the Year Electric Use and Demand Comparison 2011 Electric Use Electric Demand Mt Edgecumbe High School Gymansium (Bldg. 1331) 28 Energy Audit (March 2012) Alaska Energy Engineering LLC Billing Data 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Annual Energy Consumption and Cost Energy Cost $/MMBtu Area ECI EUI Fuel Oil $3.48 $35.89 53,826 $1.98 72 Electricity $0.108 $33.19 Source Cost Electricity 380,390 kWh $40,900 1,300 33% Fuel Oil 18,861 Gallons $65,600 2,600 67% Totals $106,500 3,900 100% Annual Energy Consumption and Cost Consumption Energy, MMBtu $0.00 $5.00 $10.00 $15.00 $20.00 $25.00 $30.00 $35.00 $40.00 Fuel Oil ElectricityCost $ / MMBtuCost of Heat Comparison Mt Edgecumbe High School Gymansium (Bldg. 1331) 29 Energy Audit (March 2012) Appendix C Equipment Data Mt Edgecumbe High School Gymansium (Bldg. 1331) 30 Energy Audit (March 2012) MotorHP / Volts / RPM / EfficAHU-12nd Floor Fan RoomClassroomsTrane21A 6,950 CFM 5 HP/ 208 V/ 1750 RPM/ 87.5%Motors ReplacedAHU-2 Gymnasium Gymnasium Trane21A 12,000 CFM 5 HP/ 208 V/ 1750 RPM/ 85.5%CFH-1 Gymnasium Gymnasium HeatTrane21A 12,000 CFM 5 HP/ 208 V/ 1750 RPM/ 85.5%CFH-1 Gymnasium Gymnasium HeatTrane21A 12,000 CFM 5 HP/ 208 V/ 1750 RPM/ 85.5%CFH-1 Gymnasium Gymnasium HeatTrane21A 12,000 CFM 5 HP/ 208 V/ 1750 RPM/ 85.5%CFH-1 Gymnasium Gymnasium HeatTrane21A 12,000 CFM 5 HP/ 208 V/ 1750 RPM/ 85.5%RF-1 Gymnasium Return Air FanPVCVentilator 6,950 CFM 2 HP/ 208 V/ 1750 RPMMAU-12nd Floor Fan Room2nd Floor Class Room TraneU85H53070 3,455 CFM 3 HP/ 208 V/ 1745 RPM/ 78%EF-16Men's/Women's Rest Rooms Greenheck SWB-13-4 920 CFM 1/4 HP/ 115 V/ 1730 RPMEF-17Laundry RoomsGreenheck CSP-60 320 CFM 1/6 HP/ 115VEF-18Men's/Women's Locker Rooms Greenheck SWB-18-30 4,020 CFM 3 HP/ 208 V/ 1730 RPM/ 81.5%CP-14 Pump Room Boiler Loop Circulation Allis Chalmers 2000 534 GPM 15 HP/ 208 V/ 1745 RPM/ 88.5%CP-15 Pump Room Boiler Loop Circulation Allis Chalmers 2000 534 GPM 15 HP/ 208 V/ 1745 RPM/ 91.7%AC-1 Pump RoomNumatic System Air CompressorJohnson Controls80 GPM 1 HP/ 208 V/ 1750 RPMHWCP Pump Room Domestic Hot Water Taco0013-F3 20 GPM 1/6 HP/ 115V/ 3250 RPMCEF-1 2nd Fl Men's Room Exhaust FanNuTone QT 500120 Volt/ 4.4 AmpsCEF-22nd Fl Women's RoomExhaust FanNuTone QT 500120 Volt/ 4.4 AmpsMt Edgecumbe High School Gymnasium - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make Model Mt Edgecumbe High School Gymansium (Bldg. 1331) 31 Energy Audit (March 2012) Appendix D Abbreviations AHU Air handling unit BTU British thermal unit BTUH BTU per hour CBJ City and Borough of Juneau CMU Concrete masonry unit CO2 Carbon dioxide CUH Cabinet unit heater DDC Direct digital controls DHW Domestic hot water EAD Exhaust air damper EEM Energy efficiency measure EF Exhaust fan Gyp Bd Gypsum board HVAC Heating, Ventilating, Air- conditioning HW Hot water HWRP Hot water recirculating pump KVA Kilovolt-amps kW Kilowatt kWh Kilowatt-hour LED Light emitting diode MBH 1,000 Btu per hour MMBH 1,000,000 Btu per hour OAD Outside air damper PSI Per square inch PSIG Per square inch gage RAD Return air damper RF Return fan SIR Savings to investment ratio SF Supply fan UV Unit ventilator VAV Variable air volume VFD Variable frequency drive Mt Edgecumbe High School Gymansium (Bldg. 1331) 32 Energy Audit (March 2012)