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HomeMy WebLinkAboutSEA-AEE-Sitka MEHS Cafeteria 2012-EE Mt Edgecumbe High School Cafeteria (Bldg 290) 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 13  Section 5: Methodology 15  Appendix A: Energy and Life Cycle Cost Analysis 18   Appendix B: Energy and Utility Data 24  Appendix C: Equipment Data 29  Appendix D: Abbreviations 31  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. Mount Edgecumbe High School Cafeteria (Bldg 290) 1 Energy Audit (March 2012) Section 1 Executive Summary An energy audit of the Mt Edgecumbe High School Cafeteria 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. Mt Edgecumbe High School Cafeteria is a 16,790 square foot building that contains commons, offices, classrooms, dining facilities, kitchen, restrooms, storage, and mechanical support spaces. Building Assessment The following summarizes our assessment of the building. Envelope The building envelope of the cafeteria building was inspected for energy efficiency opportunities. The windows have been recently upgraded from single pane to more efficient double pane units. However, the majority of the building is concrete and much heat is still unnecessarily lost through the floor and walls. Envelope issues encountered during the audit include:  Crawlspace: The crawlspace is a ventilated, cold space with a relatively high ceiling – averaging an estimated 6’ in height. The floor above is poured concrete with no insulation on the underside. We estimate that the main floor has an insulation rating of R-1; R-30 is optimal. The crawlspace has numerous ventilation louvers and six ventilation fans to supply outside air to control humidity. There are serious drainage issues due to a steady flow of surface water under the building. As a result, the crawlspace should continue to be ventilated and the floor above insulated to reduce heat loss. Recommendations for insulating the floor are included in Section 3, Energy Efficiency Measure (EEM-9).  Walls: There is no insulation in the exterior walls. The majority of the building is constructed with solid concrete walls which have an estimated insulation rating of R-; R-26 is optimal. A portion of the walls at the north end of the building were constructed with uninsulated wood framed walls, and we estimate that they have an insulation rating of R-5; R-26 is optimal. Recommendations for exterior walls are found in EEMs-11 and 15.  Attic: A large portion of the attic is uninsulated. The concrete floor in the cold attic space is the concrete ceiling of the kitchen area. The estimated insulation value for this attic floor is R-1; R-46 is optimal. As a result a significant amount of heat is lost. We recommend that the floor be insulated (EEM-6).  Windows: There is a single pane window in Dishwashing Room 108 and two windows above the east side double doors that were not upgraded as part of the 2005 window replacement project. Replacement of these windows is recommended (EEM-13). Mount Edgecumbe High School Cafeteria (Bldg 290) 2 Energy Audit (March 2012)  Freezer Corridor Doors: The double doors between the kitchen and the freezer corridor are heavily used and often left open to facilitate moving food carts between spaces. The freezer corridor is uninsulated and remains near outside temperatures, which results in an uncontrolled heat loss to this space. Installation of door closures that isolate the warm kitchen from the cold corridor are recommended (EEM-13).  Exterior Doors: Exterior doors are not thermally broken. Future exterior door replacement selection should include this feature. Weather stripping is in poor condition on many of the doors and should be replaced (EEM-1). Heating System The building is heated by a central boiler system that distributes heat to many of the campus buildings. Within the building, two pumps operate in a lead/standby sequence to distribute hydronic heating water to the heating units. A separate circulation pump supplies the heat recovery unit heating coils. Energy efficiency issues/opportunities with the heating system include:  The heating system cannot be turned off in the summer because cooling the system leads to significant leakage when the piping cools.  Excessive air leakage of the pneumatic control system is resulting in an unacceptable amount of run time on the air compressor. The 2 HP air compressor motor is currently cycling on for two minutes and then off for only two 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.  The separate pump for the heat recovery units is not needed. With recent improvements to the building envelope, the building pumps are likely capable of supplying all the heating loads. The heating system is 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 a heat recovery unit (HRU-1) for the kitchen hood, another (HRU-2) for the dishwasher hood, and an air handling unit (AHU-1) for the first floor classroom. Due to the excessive noise it generates, AHU-1 is not operated. The grease-laden exhaust air from the kitchen hood has reduced the effectiveness of the heat recovery cell in the unit. A thorough cleaning and degreasing of the coil will improve its efficiency. The ventilation strategy for the kitchen and dining hall is poor. There is no ventilation air being supplied to the dining hall and the kitchen supplies are short-circuiting directly to the exhaust hoods without providing good cross-flow through the building. CO2 levels in the dining hall after lunch showed levels of 1,300 to 1,400 ppm of CO2, well above the recommended maximum of 800-1000 ppm. The supply diffusers for HRU-1 and HRU-2 should be relocated to create good cross-flow to improve indoor air quality and moisture and odor control. The kitchen is open from 6am to 6pm. The main kitchen cooking hood (HRU-1) operates approximately four hours per day, during the main meals. It currently supplies 4,500 cfm within the kitchen space near the exhaust hood, which only ventilates the kitchen space. Relocating the supply diffusers to deliver the supply air to the far side of the dining hall will properly ventilate this densely occupied space. Mount Edgecumbe High School Cafeteria (Bldg 290) 3 Energy Audit (March 2012) The dishwasher ventilation hood (HRU-2) operates when the kitchen is open, approximately 12 hours per day. It currently supplies 1,000 cfm to the adjacent dishwashing space. Air quality in the kitchen will be improved if the supply air diffuser for HRU-2 is relocated to the furthest end of the kitchen so there is good cross-flow of ventilation air through the kitchen during the eight hours each day that the kitchen is open and the main cooking hood (HRU-1) is not operated. Lighting Most of the interior lighting consists of less-efficient T-12 fluorescent fixtures. If the lighting is upgraded to newer, more efficient lighting fixtures, this will reduce the amount of heat generated by the lighting. This heat must be made-up by the boiler, which increases fuel oil consumption. Because the additional heat produced by the T12 fluorescent fixtures is beneficial within the building envelope, we recommend that maintenance staff continue the practice of replacing the T12 fixtures with more efficient T8 fixtures only as the ballasts fail. Exterior lighting consists primarily of high pressure sodium lighting and is controlled by photocells. Maintenance staff has been replacing high pressure sodium lamps, when they fail, with more efficient compact fluorescent lamps. This practice should be continued on the exterior lighting of the cafeteria building. Summary The overall energy consumption of Mt Edgecumbe High School Cafeteria is 155 kBtu/sqft, which is more than double the energy consumption of an average school building. This higher energy use rate can be directly attributed to the kitchen energy consumption and the lack of insulation around the entire building envelope. Energy Efficiency Measures (EEMs) All buildings have opportunities to improve their energy efficiency. The energy audit revealed numerous 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: Close Doors to Freezer Hall Mount Edgecumbe High School Cafeteria (Bldg 290) 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: Install Programmable Thermostat $500 $0 ($27,800) ($27,300) 55.6 EEM-5: Replace Aerators and Showerheads $400 $0 ($4,500) ($4,100) 11.3 EEM-6: Install Insulation in Attic Storage 207 $13,600 $0 ($135,300) ($121,700) 9.9 EEM-7: Insulate Attic Wall $1,700 $0 ($16,800) ($15,100) 9.9 Medium Priority EEM-8: Repair Control System Air Leaks $2,900 $0 ($8,000) ($5,100) 2.8 EEM-9: Insulate First Floor $106,900 $0 ($274,500) ($167,600) 2.6 EEM-10: Install Dining Room Lighting Controls $8,000 ($1,500) ($13,100) ($6,600) 1.8 EEM-11: Insulate Exterior Concrete Walls $407,400 $0 ($676,000) ($268,600) 1.7 EEM-12: Upgrade Motors $2,200 $0 ($3,300) ($1,100) 1.5 EEM-13: Replace Single Pane Windows $9,100 $0 ($14,100) ($5,000) 1.5 EEM-14 Convert to Variable Speed Pumping $29,300 $0 ($25,000) $4,300 0.9 Totals* $582,000 ($1,500) ($1,198,400) ($617,900) 2.1 *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. Mount Edgecumbe High School Cafeteria (Bldg 290) 5 Energy Audit (March 2012) Section 2 Introduction This report presents the findings of an energy audit of the Mt Edgecumbe High School Cafeteria 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 Cafeteria is a 16,790 square foot building that contains a dining room, commercial kitchen, classrooms, offices, restrooms, 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  2005 – Window Upgrades  2005 – Classroom Air Handling Unit Installation  2009 – Crawlspace Vapor Barrier Mount Edgecumbe High School Cafeteria (Bldg 290) 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 193,700 kWh $23,000 700 27% Fuel Oil* 14,260 Gallons $49,600 1,900 73% Totals $72,600 2,600 100% Electricity This chart shows electrical energy use from 2008 to 2011. The data is not representative of actual use and building operations. The utility confirmed that the data was incorrect. Interestingly, the billings during this period were remarkably consistent. The utility did not provide information on how the bills were calculated from admitted bad data. The electric meter was replaced in December 2010. The data in 2011 appears to be representative of the building use. The effective cost—energy costs plus demand charges—is 12.0¢ per kWh. Fuel Oil* The building is heated by a central fuel-oil boiler system that provides heat to multiple campus buildings via an utilidor system. The heat is not metered and was calculated to be equivalent to 14,260 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%. The cost of heat is essentially equal for the two energy sources. Mount Edgecumbe High School Cafeteria (Bldg 290) 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 are firmly closed. Scope: Replace weather stripping on exterior doors and adjust as necessary to ensure complete closure. EEM-2: Remove Ventilation Fans and Insulate Purpose: An 18” x 18” diameter ventilation fan above the top of the basement stairs, and a 2’ x 2’ ventilation fan in Storage 121 are no longer in use. Energy will be saved if these fans are removed and the wall cavities are properly sealed and insulated. Scope: Remove the two unused fans and properly seal and insulate the wall cavities. Mount Edgecumbe High School Cafeteria (Bldg 290) 8 Energy Audit (March 2012) EEM-3: Close Doors to Freezer Hall Purpose: The doors between the kitchen prep area and the freezer hallway are often left open. This occurs so staff can move heavy carts through the doorway. Unfortunately, the freezer corridor is uninsulated and remains near outside temperatures, which results in an uncontrolled heat loss to this space. Energy will be saved if the doors are kept closed between cart movements. Scope: Keep the doors to the freezer corridor closed to reduce heat loss. 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: Install Programmable Thermostat Purpose: Classroom 203 is heated by perimeter baseboard heating units. The heaters are controlled from a single setpoint thermostat. Energy will be saved if a programmable thermostat is installed to provide a night setback capability. Scope: Install a programmable thermostat in Classroom 203 with night setback capability. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($980) ($980) $500 $0 ($27,800) ($27,300) 55.6 EEM-5: Replace Aerators and Showerheads Purpose: Energy and water will be saved by replacing lavatory aerators and showerheads with low- flow models. Scope: Replace lavatory aerators and showerheads with water-conserving fixtures. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($180) ($180) $400 $0 ($4,500) ($4,100) 11.3 EEM-6: Install Insulation in Attic Storage 207 Purpose: A large portion of the floor of Storage 207 is uninsulated. The concrete floor in this cold attic space is the concrete ceiling of the kitchen area. The attic has an R-2 thermal resistance; R-54 is optimal. Energy will be saved by insulating the attic. Scope: Install an R-54 batt insulation on the uninsulated floor in the attic Storage 207. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($4,770) ($4,770) $13,600 $0 ($135,300) ($121,700) 9.9 Mount Edgecumbe High School Cafeteria (Bldg 290) 9 Energy Audit (March 2012) EEM-7: Insulate Attic Wall Purpose: A concrete wall between the attic storage room and the heated darkroom space is uninsulated. The wall has a thermal resistance of R-2: R-26 is optimal. Energy will be saved if 4” of rigid insulation is applied to the wall. Scope: Apply 4” of rigid insulation to the uninsulated concrete wall. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($590) ($590) $1,700 $0 ($16,800) ($15,100) 9.9 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-8: Repair 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 compressors are operating 50 percent of the time, which is four times higher than typical for older pneumatic control systems. Energy will be saved if the leaks are fixed. Scope: Repair pneumatic control system air leaks. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($400) ($400) $2,900 $0 ($8,000) ($5,100) 2.8 EEM-9: Insulate First Floor Purpose: The first floor of the dining hall and kitchen areas is constructed of concrete and is uninsulated to the cold crawlspace. Energy will be saved if foam insulation is added to the underside of the main floor in the crawlspace. Scope: Add 6” of foam insulation to the crawlspace ceiling. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($9,680) ($9,680) $106,900 $0 ($274,500) ($167,600) 2.6 Mount Edgecumbe High School Cafeteria (Bldg 290) 10 Energy Audit (March 2012) EEM-10: Install Dining Room Lighting Controls Purpose: The dining hall lighting is kept on between meals even though the room is empty. Energy will be saved if occupancy sensors are installed to turn off the lighting when the room is unoccupied. Scope: Install occupancy sensors in the dining hall to turn off the lighting when the room is unoccupied. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR ($90) ($670) ($760) $8,000 ($1,500) ($13,100) ($6,600) 1.8 EEM-11: Insulate Exterior Concrete Walls Purpose: The majority of the walls are constructed of uninsulated concrete. The walls have an insulating value of R-2; R-26 is optimal. Energy will be saved by adding insulation to the walls. Scope: Install 4” of rigid insulation and metal siding over the uninsulated concrete walls. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($23,850) ($23,850) $407,400 $0 ($676,000) ($268,600) 1.7 EEM-12: Upgrade Motors to Premium Efficiency Purpose: The equipment inspection identified two motors that can be upgraded with premium efficiency models to save energy. They are: - CP-5 3 HP - CP-6 3 HP Scope: Replace identified motors with premium efficiency motors. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($170) ($170) $2,200 $0 ($3,300) ($1,100) 1.5 EEM-13: Replace Single Pane Windows Purpose: The windows in Dishwashing Room 108 and the two windows above the east side double doors are single pane units. Energy will be saved if these windows are replaced with high efficiency triple pane units. Scope: Replace existing windows with energy efficient triple pane units. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($500) ($500) $9,100 $0 ($14,100) ($5,000) 1.5 Mount Edgecumbe High School Cafeteria (Bldg 290) 11 Energy Audit (March 2012) LOW PRIORITY Low priority EEMs do not offer a life cycle energy savings and are not recommended. EEM-14: Convert to Variable Speed Pumping Purpose: The heating system has constant speed pumps that circulate water to the building. These pumps have constant energy consumption as heating loads vary with the seasons. Energy will be saved if the constant speed pumps are modulated by a variable frequency drive to match the heating load. Scope: Convert constant speed heating pumps to variable speed. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($1,270) ($1,270) $29,300 $0 ($25,000) $4,300 0.9 EEM-15: Insulate Exterior Wood Framed Wall Purpose: Approximately 25% of the cafeteria is constructed with uninsulated wood framed walls. The walls have an R-5 thermal resistance; R-26 is optimal. Energy will be saved if 4” of rigid insulation and a siding material is applied over the walls. The addition of wall insulation will reduce leakage through the walls. It will be necessary to ventilate the spaces to control humidity so the moisture does not move into the walls and cause mold and rot issues. Scope: Install 4” of rigid insulation and siding over the uninsulated wood framed walls. Install a ventilation system in the fan room to service the associated spaces. While a ventilation system is essential to maintaining a healthy building, the added ventilation energy makes this a healthy building issue, not an energy efficiency measure. Mount Edgecumbe High School Cafeteria (Bldg 290) 12 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 Exterior Wall 5/8” Gyp. bd, 2”x 6” stud, no insulation, siding (2,372 sq ft) R-5 R-26 Exterior Wall 8” concrete – uninsulated (6,956 sq ft) R-1 R-26 Roof R-38 batt insulation in attic spaces R-38 R-46 Floor Uninsulated concrete slab above crawlspace R-1 R-10 Foundation 8” concrete walls with operable ventilation fans R-0 R-20 Windows Double pane aluminum clad 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 via utilidors. Heating water is circulated by building pumps CP-5 and CP-6 to terminal units and pump CP-13 circulates water to the heating coils in HRU-1 & 2. Domestic Hot Water System Domestic hot water is provided by the central boiler system and circulated throughout the cafeteria building via the main boiler room domestic hot water circulation pump. Mount Edgecumbe High School Cafeteria (Bldg 290) 13 Energy Audit (March 2012) Ventilation Systems Area Fan System Description Kitchen HRU-1 5,600 cfm 5 hp exhaust, 4,500 cfm 5 hp supply heat reclamation unit Kitchen HRU-2 1,250 cfm 3/4 hp exhaust, 1,000 cfm 3/4 hp supply heat reclamation unit 1st Floor Classroom AHU-1 Constant volume air handling unit consisting of a heating coil, mixing box, filter section, and supply fan. No documentation on size/capacity. This system is not used due to excessive noise. Men’s Restroom 115 EF-13 225 cfm 130 watt constant volume exhaust fan Women’s Restroom 114 EF-14 225 cfm 130 watt constant volume exhaust fan Men’s Restroom 102 EF-15 120 cfm 105 watt constant volume exhaust fan Women’s Restroom 103 EF-15 120 cfm 105 watt constant volume exhaust fan Crawlspace VF-3 4,850 cfm ½ hp constant volume exhaust fan Crawlspace VF-3 4,850 cfm ½ hp constant volume exhaust fan Crawlspace VF-3 4,850 cfm ½ hp constant volume exhaust fan Crawlspace VF-3 4,850 cfm ½ hp constant volume exhaust fan Crawlspace VF-3 4,850 cfm ½ hp constant volume exhaust fan Crawlspace VF-3 4,850 cfm ½ hp constant volume exhaust fan Lighting Most of the interior lighting consists of less-efficient T-12 fluorescent fixtures. If the lighting is upgraded to newer, more efficient lighting fixtures, this will reduce the amount of heat generated by the lighting. This heat must be made-up by the boiler, which increases fuel oil consumption. Because the additional heat produced by the T12 fluorescent fixtures is beneficial within the building envelope, we recommend that maintenance staff continue the practice of replacing the T12 fixtures with more efficient T8 fixtures only as the ballasts fail. Exterior lighting consists primarily of high pressure sodium lighting and is controlled by photocells. Maintenance staff has been replacing high pressure sodium lamps, when they fail, with more efficient compact fluorescent lamps. This practice should be continued on the exterior lighting of the cafeteria building. Electric Equipment Commercial equipment for food preparation is located in the kitchen. Some residential kitchen equipment is located in the second floor classrooms. Mount Edgecumbe High School Cafeteria (Bldg 290) 14 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. Mount Edgecumbe High School Cafeteria (Bldg 290) 15 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: Mount Edgecumbe High School Cafeteria (Bldg 290) 16 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 3%, 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 $0.120/kwh General Inflation Rate 2% Electricity Inflation 3% Fuel Oil Cost (2012) $3.48/gal Fuel Oil Inflation 6% Mount Edgecumbe High School Cafeteria (Bldg 290) 17 Energy Audit (March 2012) Appendix A Energy and Life Cycle Cost Analysis Mount Edgecumbe High School Cafeteria (Bldg 290) 18 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 Cafeteria 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 $0.102 -3% $0.105 - EEM-4: Install Programmable Thermostat Energy Analysis Component Area R,exist ΔT, exist ΔT, new ΔMBH kBtu η boiler Gallons Wall 972 5 25 15 -1.9 -17,029 68%-181 Windows 80 1.5 25 15 -0.5 -4,672 68%-50 Roof 1,440 38 25 15 -0.4 -3,320 68%-35 -2.9 -25,021 -266 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install programmable thermostat 0 1 ea $500 $500 Energy Costs Fuel Oil 1 - 25 -266 gal $3.69 ($27,778) Net Present Worth ($27,300) EEM-5: 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 7.0 10 -700 80% -374 -4 Lavatories 0.3 0.2 100 270 -4,860 80% -2,594 -28 -5,560 -32 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Replace lavatory aerators 0 10 ea $35 $350 Replace showerhead 0 2 ea $35 $70 Energy Costs Water 1 - 25 -6 kgals $10.960 ($1,198) Fuel Oil 1 - 25 -32 gal $3.69 ($3,295) Net Present Worth ($4,100) Gallons per Use Mount Edgecumbe High School Cafeteria (Bldg 290) 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 Cafeteria EEM-6: Install Insulation in Attic Storage 207 Energy Analysis Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons Roof 1,440 2 59 20 -13.9 -121,868 68%-1,294 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install attic insulation 0 7,646 sqft $1 $7,646 Estimating contingency 0 15%$1,147 Overhead & profit 0 30%$2,638 Design fees 0 10%$1,143 Project management 0 8%$1,006 Energy Costs Fuel Oil 1 - 25 -1,294 gal $3.69 ($135,296) Net Present Worth ($121,700) EEM-7: Insulate Attic Wall Energy Analysis Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons Wall 190 2 22 20 -1.7 -15,131 68%-161 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install wall insulation 0 190 sqft $5 $950 Estimating contingency 0 15%$143 Overhead & profit 0 30%$328 Design fees 0 10%$142 Project management 0 8%$125 Energy Costs Fuel Oil 1 - 25 -161 gal $3.69 ($16,798) Net Present Worth ($15,100) EEM-8: Repair Control System Air Leaks Energy Analysis Equip Number HP ηold kW Hours, exist Hours, new kWh CP-5/6 1 3 81.4% 1.82 4,380 2,190 -3,990 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Repair pheumatic leaks 0 40 hrs 60 $2,400 Parts 0 1 ea 500 $500 Energy Costs Electric Energy 1 - 25 -3,990 kWh $0.101 ($7,957) Net Present Worth ($5,100) Mount Edgecumbe High School Cafeteria (Bldg 290) 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 Cafeteria EEM-9: Insulate First Floor Energy Analysis Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons Floor 10,034 4 34 15 -33.2 -290,838 80%-2,625 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install ceiling insulation 0 10,034 sqft $6 $60,204 Estimating contingency 0 15%$9,031 Overhead & profit 0 30% $20,770 Design fees 0 10%$9,000 Project management 0 8%$7,920 Annual Costs 1 - 25 $60.00 $0 1 - 25 $60.00 $0 1 - 25 $50.00 $0 Energy Costs Water 1 - 25 kgals $10.960 $0 Electric Energy 1 - 25 kWh $0.101 $0 Electric Demand 1 - 25 kW $4.02 $0 Electric Energy (Effective Cost)1 - 25 kWh $0.105 $0 Fuel Oil 1 - 25 -2,625 gal $3.69 ($274,452) Net Present Worth ($167,500) EEM-10: Install Dining Room Lighting Controls Energy Analysis Type # Fixtures Lamp Lamp, watts Fixture Watts Hours, exist Hours, new Savings, kWh Recessed 44 3T12 96 110 3,240 1,890 -6,558 Lamp Replacement Type # Fixtures Lamp # Lamps Life, hrs Lamps//yr $/lamp $/Replace Recessed 44 3T12 3 36,000 -4.95 $4 $15 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install occupancy sensors 0 3 LS $1,500 $4,500 Estimating contingency 0 15%$675 Overhead & profit 0 30%$1,553 Design fees 0 10%$673 Project management 0 8%$592 Annual Costs Lamp replacement 1 - 25 -4.95 lamps $18.00 ($1,517) Energy Costs Electric Energy 1 - 25 -6,558 kWh $0.101 ($13,079) Net Present Worth ($6,600) Mount Edgecumbe High School Cafeteria (Bldg 290) 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 Cafeteria EEM-11: Insulate Exterior Concrete Walls Energy Analysis Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons Wall 7,646 2 22 20 -69.5 -608,900 68%-6,465 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install wall insulation and metal cladding 0 7,646 sqft $30 $229,380 Estimating contingency 0 15% $34,407 Overhead & profit 0 30% $79,136 Design fees 0 10% $34,292 Project management 0 8% $30,177 Energy Costs Fuel Oil 1 - 25 -6,465 gal $3.69 ($675,992) Net Present Worth ($268,600) EEM-12: Upgrade Motors Energy Analysis Equip Number HP ηold ηnew kW Hours kWh CP-5/6 1 3 81.4% 89.5% -0.18 8,760 -1,588 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs HP Replace motor 3 0 2 LS 1,080 $2,160 Energy Costs Electric Energy 1 - 25 -1,588 kWh $0.101 ($3,167) Electric Demand 1 - 25 -2 kW $4.02 ($172) Net Present Worth ($1,200) EEM-13: Replace Single Pane Windows Energy Analysis Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons Windows 51 0.75 5.0 25 -1.4 -12,658 68%-134 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Replace window glazing unit 0 51 sqft $100 $5,100 Estimating contingency 0 15%$765 Overhead & profit 0 30%$1,760 Design fees 0 10%$762 Project management 0 8%$671 Energy Costs Fuel Oil 1 - 25 -134 gal $3.69 ($14,053) Net Present Worth ($5,000) Mount Edgecumbe High School Cafeteria (Bldg 290) 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 Cafeteria EEM-14 Convert to Variable Speed Pumping Energy Analysis Case GMP Head η pump BHP η motor kW Hours kWh Existing -128 27 55% -2.1 89% -1.8 8,760 -15,608 New 50 15 55% 0.5 89% 0.4 8,760 3,387 -1.4 -12,221 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install VFD 0 2 ea $7,500 $15,000 Pressure transducer and wiring 0 1 ea $4,000 $4,000 Overhead & profit 0 30%$5,700 Design fees 0 10%$2,470 Project management 0 8%$2,174 Energy Costs Electric Energy 1 - 25 -12,221 kWh $0.101 ($24,374) Electric Demand 1 - 25 -8 kW $4.02 ($661) Net Present Worth $4,300 Mount Edgecumbe High School Cafeteria (Bldg 290) 23 Energy Audit (March 2012) Appendix B Energy and Utility Data Mount Edgecumbe High School Cafeteria (Bldg 290) 24 Energy Audit (March 2012) Alaska Energy Engineering LLC Billing Data 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Mt. Edgecumbe High School Cafeteria ELECTRIC RATE Electricity ($ / 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 14,080 90 800 15 800 15 18,500 104 8,545 Feb 21,120 96 1,920 20 2,080 20 22,080 102 11,800 Mar 14,560 94 1,680 19 1,840 19 18,800 104 9,220 Apr 18,080 110 2,160 18 1,360 18 21,760 110 10,840 May 2,560 86 960 25 560 25 11,120 86 3,800 Jun 1,680 14 1,280 14 480 14 6,240 14 2,420 Jul 2,720 20 1,200 34 560 34 5,600 34 2,520 Aug 960 24 560 24 240 24 8,800 73 2,640 Sep 5,840 24 2,480 28 1,600 28 21,040 114 7,740 Oct 4,960 21 2,080 32 1,760 32 21,280 98 7,520 Nov 4,080 18 2,160 27 2,000 27 21,040 106 7,320 Dec 1,520 26 1,200 65 1,360 65 17,440 122 5,380 Total 92,160 18,480 14,640 193,700 79,745 Average 7,680 52 1,540 27 1,220 27 16,142 89 6,645 Load Factor 20.3% 7.9% 6.3% 24.9% 48 ELECTRIC BILLING DETAILS Month Energy Demand Total Energy Demand Total % Change Jan $109 $0 $109 $1,901 $308 $2,209 1931.5% Feb $242 $0 $242 $2,254 $302 $2,555 957.7% Mar $217 $0 $217 $1,931 $308 $2,239 933.1% Apr $167 $0 $167 $2,222 $330 $2,552 1429.4% May $84 $0 $84 $1,174 $236 $1,410 1582.4% Jun $74 $0 $74 $673 $0 $673 804.0% Jul $84 $34 $117 $607 $34 $641 445.7% Aug $37 $0 $37 $939 $186 $1,126 2921.8% Sep $192 $12 $203 $2,151 $346 $2,497 1127.0% Oct $208 $27 $236 $2,175 $283 $2,458 942.9% Nov $233 $8 $241 $2,151 $314 $2,465 922.6% Dec $167 $156 $323 $1,797 $377 $2,173 573.1% Total $ 1,814 $ 236 $ 2,050 $ 19,974 $ 3,024 $ 22,998 1021.9% Average $ 151 $ 20 $ 171 $ 1,665 $ 252 $ 1,917 1021.9% Cost ($/kWh) $0.140 87% 13% $0.119 -15.2% $0.103 2010 2011 Electrical costs are based on the current electric rates. 2011 General Service Month 2008 2009 2010 Average Mount Edgecumbe High School Cafeteria (Bldg 290) 25 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 High School Cafeteria 0 0 0 0 0 0 0 0 0 0 0 0 0 5,000 10,000 15,000 20,000 25,000 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 Mount Edgecumbe High School Cafeteria (Bldg 290) 26 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 High School Cafeteria 2011 $ 0 $ 500 $ 1,000 $ 1,500 $ 2,000 $ 2,500 $ 3,000 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 80 100 120 140 0 5,000 10,000 15,000 20,000 25,000 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 Mount Edgecumbe High School Cafeteria (Bldg 290) 27 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 16,790 $4.32 155 Electricity $0.119 $36.63 Source Cost Electricity 193,700 kWh $23,000 700 27% Fuel Oil 14,260 Gallons $49,600 1,900 73% Totals $72,600 2,600 100% 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 Mount Edgecumbe High School Cafeteria (Bldg 290) 28 Energy Audit (March 2012) Appendix C Equipment Data Mount Edgecumbe High School Cafeteria (Bldg 290) 29 Energy Audit (March 2012) MotorHP / Volts / RPM / EfficAHU-1 1st FloorVentilation Name Plate Data Not Available Not used due to noise.HRU-1 Kitchen Fan Room Heat Recovery Unit Exhaust Gaylord HRU 5600 CFM 5 HP/ 208V/ 1750 RPM/ 85.5%Heat Recovery Unit Supply Gaylord HRU 4500 CFM 5 HP/ 208V/ 1750 RPM/ 85.5%HRU-2 Kitchen Fan Room Heat Recovery Unit Exhaust Gaylord HRU 1250 CFM 3/4 HP/ 208 V/ 75%Heat Recovery Unit Supply Gaylord HRU 1000 CFM 3/4 HP/ 208 V/ 75%A-1 Mechnical Room 116 Air CompressorIngersoll Rand T-302 HP/ 208V/1750 RPM /84%CP-5 Mechnical Room 116 Boiler Loup Pump Allis-Chalmers 2000 128 GPM 3 HP/ 208V/ 1750 RPM/ 81.5% 27' Head PressureCP-6 Mechnical Room 116 Boiler Loup Pump Allis-Chalmers 2000 128 GPM 3 HP/ 208V/ 1750 RPM/ 81.5% 27' Head PressureCP-13 Mechnical Room 116 Heat Recovery Units7 GPM 1/6 HP/ 120 V/ 3720 RPMVF-3 Crawl Space VentilationPenn FB 242 4850 CFM 1/2 HP/ 120 V/ 62%VF-3 Crawl Space VentilationPenn FB 242 4850 CFM 1/2 HP/ 120 V/ 62%VF-3 Crawl Space VentilationPenn FB 242 4850 CFM 1/2 HP/ 120 V/ 62%VF-3 Crawl Space VentilationPenn FB 242 4850 CFM 1/2 HP/ 120 V/ 62%VF-3 Crawl Space VentilationPenn FB 242 4850 CFM 1/2 HP/ 120 V/ 62%VF-3 Crawl Space VentilationPenn FB 242 4850 CFM 1/2 HP/ 120 V/ 62%EF15 Womens Room 103 Exhaust FanPenn Z-8 120 CFM 105 Watts/120 VEF15 Mens Room 102 Exhaust FanPenn Z-8 120 CFM 105 Watts/120 VEF14 Womens Room 114 Exhaust FanPenn Z-10 225 CFM 130 Watts/120 VEF13 Mens Room 115 Exhaust FanPenn Z-10 225 CFM 130 Watts/120 V - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make Model Mount Edgecumbe High School Cafeteria (Bldg 290) 30 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 Mount Edgecumbe High School Cafeteria (Bldg 290) 31 Energy Audit (March 2012)