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HomeMy WebLinkAboutSEA-AEE-JNU Treadwell Arena 2012-EE Treadwell Ice Arena City and Borough of Juneau Funded by: Final Report December 2011 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 25  Appendix C: Equipment Data 32  Appendix D: Abbreviations 35  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 Treadwell Ice Arena 1 Energy Audit (December 2011) Section 1 Executive Summary An energy audit of the Treadwell Arena 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 Treadwell Arena is a 36,158 square foot building that contains offices, commons spaces, locker rooms, restrooms, storage, a mezzanine, an ice skating rink and bleachers, and mechanical support spaces. Building Assessment The following summarizes our assessment of the building. Envelope The building envelope appears to be well maintained and is providing good service. The exterior walls and ceiling are fairly well insulated and a thermal break was intentionally installed in the ceiling to aid in the performance of the ceiling insulation package. The exterior walls have an estimated insulation value of R-20, and the ceiling is an estimated R-30. It should be noted that the purpose of the arena ceiling insulation is to retain the cold air generated by the ice rink. That is because, unlike the more energy efficient indoor skating rink designs that are heated to 50°-60°F in an effort to optimize all of the energy cycles utilized within the building envelope, the Treadwell Arena is intentionally unheated. The insulation of the interior framed walls and ceilings of the offices, locker rooms, and restrooms is actually necessary to reduce heat loss from these conditioned spaces to the interior of the building. The open skating area in the center of the building has a constant temperature of just under 40°F whenever the rink has ice. This results in a 30°F temperature differential between the rink and the conditioned spaces. The year-round average difference in temperature between these spaces and the interior skating rink area is actually larger than the difference in temperature between these spaces and the exterior, even though the exterior walls are more heavily insulated. The ceiling insulation value for the offices, lockers, and restrooms is only R-20, where an R-46 would be optimal. The interior wall insulation value for the offices, lockers, and restrooms is only R-12, where an R-26 would be optimal. The insulation value for the interior conditioned spaces is inadequate. An evaluation to add insulation to these walls was performed and it did not show a positive return on investment. This is not because the additional insulation isn’t needed. It is because the cost to install the insulation after the building has already been constructed is too high. This is a design that will result in excessive long-term operational costs—there was adequate space to install R-30 batt insulation in the ceilings and R-21 batt in the walls. The exterior doors are not thermally broken. Future exterior door replacement selection should include this feature. Weather stripping is in poor condition and should be replaced. Treadwell Ice Arena 2 Energy Audit (December 2011) Heating & Ventilation Systems The building is heated by one fuel oil boiler that provides heat to three heat recovery ventilator (HRV) unit systems, unit heaters, 5 indirect hot water heaters, and perimeter hydronic systems in the conditioned spaces. The boiler system is in a dedicated mechanical space and the heating loop water is delivered by piping that is physically attached to the inside walls of the building in such a manner that it cannot expand or contract. Heating pipes have broken as a result of the non-expandable design. The ventilation rates of the HRV systems are excessive much of the day when locker rooms are lightly used. The result is an unnecessarily high heating oil consumption rate. The three HRV’s deliver 7,140 cfm of conditioned outside air to the 6,150 square feet of offices, locker rooms, and restrooms. This is 1.2 cfm/sqft whether the spaces are occupied or not. For the type and frequency of use of those spaces, a system that can modulate the outside air with humidity levels will significantly reduce the heating load on the boiler system. The chiller system that is used for ice making currently utilizes a roof top condenser to dump the heat generated from the ice making process outside of the building envelope. The chiller is a 70 ton unit. Preliminary calculations show that the average rate of rejected heat is sufficient for supplying the building heating load. If this heat were utilized within the building, it would essentially eliminate all of the fuel oil consumption at the facility—over 15,000 gallons/year. In an effort to maximize the ice quality at the arena, two propane dehumidifiers are operated to reduce the relative humidity to between 45% and 55%. These units have a peak load of 253 MBH and 235 MBH each. If the ventilation rate of the interior heated spaces was reduced as mentioned above, the heating load on the building would be reduced enough that not only could all of the heating demand be carried by the chiller system, but a sizable portion of the dehumidifier systems could be too. Although it sounds contradictory, more energy is used to condition and dehumidify the unheated Treadwell Arena than would be used if the main space was heated to 50°-60°F. To take this one step further, if the rink space was heated with refrigeration heat and the propane powered Zamboni was replaced with a similar electric-powered model the Treadwell Arena could eliminate the use of fuel oil and propane in the building and have the entire facility power by hydroelectricity. Currently propane is used for both the Zamboni and the dehumidifiers. Unfortunately, the existing design sets up a vicious energy consumption cycle. A propane powered Zamboni exhausts water vapor and combustion pollutants such as CO, CO2, NO2 and combustion particles into the building; many ice arena’s experience poor indoor air quality due to Zamboni operation. We recommend that air quality monitoring be performed continuously for these pollutants and that ventilation systems operate continuously, modulating with pollutant level, when the building is occupied. Not only does this reduce the air quality in the building for the occupants, it is the catalyst for the cycle of conflicting energy demands. As the humidity goes up and hits the 55% setpoint, the propane- powered dehumidifiers are automatically started. They run to try to maintain the humidity level between 45% and 55%. As the exhaust air from the Zamboni concentrates in the arena, the CO2 levels trigger the exhaust fans to bring in outside air to improve air quality for the occupants. The outside air in Juneau is typically much higher in humidity than the desired humidity setpoints inside the arena. Once the outside air is brought into the building, the humidity sensors then trigger the propane- powered dehumidifiers to run once again. This cycle repeats itself every 20 minutes on hockey game days when the Zamboni runs between each period. In addition to reducing utility costs for the arena, the energy cost of operating the Zamboni would be reduced by shifting from propane power at an estimated $1.10/use to electricity at $0.25/use. Treadwell Ice Arena 3 Energy Audit (December 2011) The remainder of the heating and ventilating systems 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. Cooling Systems The ice rink is maintained by a 70-ton CIMCO chilling unit that rejects the heat to a rooftop mounted condenser unit. As mentioned, there is no recovery of the rejected heat. Lighting Interior lighting consists primarily of T8 fluorescent fixtures throughout the spaces and 1000-watt metal halide pendant fixtures above the arena. The pendant fixtures are made with a special glass due to the potential for impact by hockey pucks. Exterior lighting primarily consists of compact fluorescent and metal halide lighting. While more energy efficient fixtures are available that could deliver similar lighting intensity to the arena, they do not have the necessary impact resistant housings and are not recommended due to potential safety issues. Parking lot lighting and a portion of the building perimeter lights are not powered from the Treadwell Arena electrical system, but are instead controlled by a photocell that is located in Savikko Park. During the inspection these lights were still on at 10:30 am. The remainder of the perimeter lighting is powered by the Treadwell Arena electrical system and the photocell for that lighting circuit was operating properly. Maintenance staff has replaced the exterior high pressure sodium lights with much more energy efficient compact fluorescent lamps. They have also improved circuiting so the lobby lights can be turned on without lighting half the ice rink. Summary It is the assessment of the energy audit team that the majority of the building energy losses are due to insufficient insulation in interior walls of heated spaces and over-ventilation rates for those same spaces. The greatest potential for reducing operational costs through energy efficiency measures however is by utilizing the heat generated by the ice refrigeration system to heat the facility and perform dehumidification. 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: De-Lamp Soft Drink Coolers Treadwell Ice Arena 4 Energy Audit (December 2011) 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-3: Install Heating Pipe Insulation $200 $0 ($18,300) ($18,100) 91.5 EEM-4: Replace Aerators and Showerheads $1,100 $0 ($66,900) ($65,800) 60.8 EEM-5: Install Door in Rental Pass-through $1,800 ($900) ($13,000) ($12,100) 7.7 EEM-6: Install Refrigeration. Heat Recovery $470,300 $8,900 ($1,502,000) ($1,022,800) 3.2 Medium Priority EEM-7: Replace Zamboni $162,000 ($17,000) ($339,500) ($194,500) 2.2 EEM-8: Optimize HRVs $108,300 $0 ($189,500) ($81,200) 1.7 EEM-9: Dehumidify Using Recovered Heat $337,500 ($3,400) ($418,900) ($84,800) 1.3 EEM-10: Upgrade Motors $6,600 $0 ($8,000) ($1,400) 1.2 Totals* $1,087,800 ($12,400) ($2,556,100) ($1,480,700) 2.4 *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. We recommend 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. Treadwell Ice Arena 5 Energy Audit (December 2011) Section 2 Introduction This report presents the findings of an energy audit of the Treadwell Arena located in Douglas, 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 The Treadwell Arena is a 36,158 square foot building that contains offices, commons spaces, locker rooms, restrooms, storage, a mezzanine, an ice skating rink and bleachers, and mechanical support spaces. The facility is operated by 12 staff and open from August – April. It is shut down from May – July. It is occupied in the following manner: Arena 6:00 am – Midnight (7 days per week) 20-85 people at any time Snack Bar Operated approximately 20 times/year Building History 2003 – Original Construction 2005 – Locker Room Addition 2010 – Light circuiting and switching modifications Treadwell Ice Arena 6 Energy Audit (December 2011) Energy Consumption The building energy sources include an electric service and a fuel oil tank. Fuel oil is the primary source for the majority of the heating loads and domestic hot water. Electricity is used for additional domestic hot water and for the ice rink chiller system. Propane is used for the dehumidifier and the Zamboni. The following table shows annual energy use and cost. Annual Energy Consumption and Cost Source Consumption Cost Energy, MMBtu Electricity 695,570 kWh $65,300 2,400 43% Fuel Oil 15,921 Gallons $56,000 2,200 39% Propane 10,924 Gallons $25,200 1,000 18% Totals $146,500 5,600 100% Electricity This chart shows electrical energy use from 2007 to 2010. The effective cost— energy costs plus demand charges—is 9.4¢ per kWh. Fuel Oil and Propane The building uses heating oil to heat the lockers, office, and adjacent spaces. Propane is used to dehumidify the ice rink and operate the Zamboni. The following chart shows the fuel oil and propane energy use from 2007 to 2010. The chart compares annual use with the heating degree days which is a measurement of the demand for energy to heat a building. A year with a higher number of degree days reflects colder outside temperatures and a higher heating requirement. Cost of Heat Comparison The following chart shows a comparison of the current cost of fuel oil heat and electric heat. The comparison is based on a fuel oil conversion efficiency of 70%, propane efficiency of 90%, and electric boiler conversion efficiency of 95%. Electric heat is currently less expensive than fuel oil heat. Treadwell Ice Arena 7 Energy Audit (December 2011) 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 steel doors do not seal and are missing weather stripping. Energy will be saved if doors are properly weather-stripped to reduce infiltration. Scope: Replace weather stripping on exterior doors. EEM-2: De-Lamp Soft Drink Coolers Purpose: The lamps for the soft drink coolers in the commons area run continuously and are not necessary. Energy will be saved if the lamps are removed. Scope: Remove lamps from the soft drink coolers in the commons area. Treadwell Ice Arena 8 Energy Audit (December 2011) 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-3: Install Heating Pipe Insulation Purpose: There are sections of uninsulated heating piping in the building. Energy will be saved if these sections of piping are optimally insulated. Scope: Install pipe insulation on uninsulated heating piping. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($650) ($650) $200 $0 ($18,300) ($18,100) 91.5 EEM-4: Replace Lavatory Aerators and Showerheads Purpose: Energy and water will be saved by replacing the lavatory aerators and showers 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 ($2,640) ($2,640) $1,100 $0 ($66,900) ($65,800) 60.8 EEM-5: Install Sliding Doors in Skate Rental Pass-through Room Purpose: The skate rental shop is a heated space that is always open to the skating arena space by a 6’x4’ opening. The reception office has a similar opening to the arena; however, a sliding plexiglass window system was installed to help preserve heat. Energy will be saved if a similar sliding window system is installed in the opening to the skate rental shop. Scope: Install a sliding plexiglass window system in the 6’x4’ opening of the skate rental shop space. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR ($50) ($460) ($510) $1,800 ($900) ($13,000) ($12,100) 7.7 Treadwell Ice Arena 9 Energy Audit (December 2011) EEM-6: Install Refrigeration Heat Recovery Purpose: The ice rink refrigeration system generates a large amount of heat, most of which is discharged outside of the building. Energy will be saved by recovering the heat and using it to heat rooms, ventilation air, and domestic water. This EEM is intended as the first phase of a refrigeration heat recovery project, and would leave the propane dehumidifiers in place. Heat recovery is a common feature of ice arenas and is supported by the refrigeration manufacturer. Scope: Retro-fit the rink refrigeration system with an “Eco-Chill” heat recovery system provided by CIMCO, the original rink system manufacturer. The system will include a heat exchanger to move heat from the hot refrigerant gas to a low temperature heating water system, and a water storage tank for use during the off cycles of the refrigeration system. Convert all heating systems in the building to use low temperature heating water. Install additional domestic water heaters to provide adequate capacity with the low temperature water. CIMCO representatives would not respond to repeated requests for design and cost information related to their products, and these are very specialized systems that are not widely available. If the CBJ shows significant interest in this EEM, the manufacturer’s costs should be gathered to verify the cost estimate. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $520 ($52,660) ($52,140) $470,300 $8,900 ($1,502,000) ($1,022,800) 3.2 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-7: Replace Zamboni Purpose: The exhaust air from the propane-powered Zamboni significantly increases the humidity, CO, and CO2 levels of the arena. Not only does this reduce the air quality in the building for the occupants, it is the catalyst for the cycle of conflicting energy demands. Propane is consumed to remove water vapor released by the Zamboni exhaust and remove water vapor from the ventilation air that is needed to remove Zamboni pollutants. Energy to operate the arena will be saved if the propane Zamboni is replaced with an electric model. In addition to reducing arena energy requirements, the electric model ($0.25 per use) has lower energy costs than the propane model ($1.11 per use). Scope: Replace the propane powered Zamboni with an electric powered Zamboni. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR ($1,000) ($11,700) ($12,700) $162,000 ($17,000) ($339,500) ($194,500) 2.2 Treadwell Ice Arena 10 Energy Audit (December 2011) EEM-8: Optimize Heat Recovery Ventilators Purpose: The heat recovery ventilators (HRVs) for the locker rooms dehumidify and ventilate with 100% outside air. The lockers are used sporadically and seldom at full capacity. Energy will be saved if the capacity of the HRVs is modulated to maintain adequate CO2 and humidity levels. The defrost controls for the HRVs appear to not be optimized. Optimization will increase the heat recovery potential of the units. The thermostats in the locker rooms served by AHU-3 are located adjacent to the door. When the door opens, the cold rink air flows into the room, causing the thermostat to sense a colder room. Energy will be saved if the thermostats are relocated to an interior wall away from the door. Scope: Perform the following modifications to the HRVs: - Install VFDs on the HRV supply and return fans and controls to modulate air flow to maintain adequate CO2 and humidity levels. - Optimize the defrost controls to increase the heat recovery potential of the units. - Relocate the HRV-3 thermostats to a wall within the locker room. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($6,740) ($6,740) $108,300 $0 ($189,500) ($81,200) 1.7 EEM-9: Dehumidify Using Recovered Heat Purpose: The ice rink refrigeration system generates a large amount of heat, most of which is discharged outside of the building. Energy will be saved by using the heat to provide de- humidification. This EEM is intended as a second phase of the refrigeration heat recovery project (EEM-6). It is also possible to consider heating the rink with refrigeration air. This can be accomplished by adding heat at the dehumidifier or by using the locker HRVs to supply heated ventilation air to the arena and then transferring the air into the locker rooms to makeup the exhaust. This possibility will require a through design effort as part of the dehumidifier replacement design to determine if it is feasible. Scope: Replace the existing propane-fired desiccant dehumidifiers with Munters Corporation “Free-Dry” dehumidifiers, or similar. These units are specifically designed to operate using low temperature heating water, and can provide tempered ventilation air to the rink areas. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR ($200) ($14,780) ($14,980) $337,500 ($3,400) ($418,900) ($84,800) 1.3 Treadwell Ice Arena 11 Energy Audit (December 2011) EEM-10: Upgrade Motors to Premium Efficiency Purpose: The equipment inspection identified nine motors that could be upgraded with premium efficiency models to save energy. They are: - DH-1 5 HP from 87.5% efficiency to 91.0% efficiency - Brine Pump 1 3 HP from 86.5% efficiency to 89.5% efficiency - Brine Pump 2 3 HP from 86.5% efficiency to 89.5% efficiency - Cold Brine Pump 20 HP from 91.0% efficiency to 93.0% efficiency Scope: Replace identified motors with premium efficiency motors. Annual Costs Life Cycle Costs Operating Energy Total Investment Operating Energy Total SIR $0 ($410) ($410) $6,600 $0 ($8,000) ($1,400) 1.2 LOW PRIORITY Low priority EEMs do not offer a life cycle energy savings and are not recommended. EEM-11: Boiler Room Heat Recovery Purpose: Heat loss from the boiler and hydronic heating system causes the boiler room temperature to be 80-90°F. Energy will be saved if the heat in the boiler room is recovered and transferred to the heated areas of the building. Scope: Install a heat recovery unit in the boiler room space and transfer the heat to heated spaces within the building. An analysis of this EEM is not provided because a refrigeration heat recovery system, coupled with disabling the boiler when that system can meet the heating load, will significantly reduce the heat gain in the boiler room. If refrigeration heat recovery is not pursued, this EEM should be considered. Treadwell Ice Arena 12 Energy Audit (December 2011) 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 Walls R-19 batt insulation w/ metal siding R-20 R-26 Interior Walls 3/8” ply, 2”x4” wood stud, R-11 batt insulation 3/8” ply R-12 R-26 Arena Ceiling R-30 batt, ½” thermal block, metal roof R-30 R-46 Interior Ceilings 2” x 10” joists, R-20 R-46 Floor Slab 7” Concrete slab-on-grade w/ 4” foam insulation R-10 R-10 Foundation 8” concrete w/out insulation board R-5 R-20 Windows Vinyl double pane 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 one fuel oil boiler that provide heat to three heat recovery unit systems, unit heaters, 5 indirect hot water heaters, and perimeter hydronic systems. The heating system has the following pumps: P-1 is a boiler circulation pump P-2 is a boiler bypass pump HWRP is a domestic hot water recirculation pump Treadwell Ice Arena 13 Energy Audit (December 2011) Ventilation Systems Area Fan System Description Main Entry Rooms HRV-1 2,090 cfm 2 HP air to air heat exchanger Lockers/Showers 1-4 HRV-2 2,720 cfm 3 HP air to air heat exchanger Locker Rooms 5 & 6 HRV-3 2,330 cfm 2 HP air to air heat exchanger Arena Dehumidifier DH-1 253 MBTU dehumidifier Arena Dehumidifier DH-2 235 MBTU dehumidifier Ice Rink EF-1 6,000 cfm 1 ½ HP wall mounted propeller fan Ice Rink EF-2 6,000 cfm 1 ½ HP wall mounted propeller fan Refrigeration EF-3 250 cfm 1/20 HP centrifugal sidewall exhaust fan Refrigeration EF-4 3,000 cfm ¾ HP wall mounted propeller fan Domestic Hot Water System The domestic hot water system consists of 5 indirect hot water heaters and 2 electric water heaters. All 5 indirect hot water heaters are Amtrol 120 gallon units and designated as HWM-1 thru HWM-5. HWM -1 and HWM-2 serve the Zamboni hot water supply, HWM-3 & HWM-4 serve locker rooms 1 thru 4, and HWM-5 serves locker rooms 5 & 6. There is a 6-gallon electric direct hot water heater in the concessions space to deliver water heated to 120°F to the kitchen for code compliance, and there is a 50-gallon electric direct hot water heater in the locker room mechanical mezzanine that supplies the official’s locker room domestic hot water demand. Cooling Systems The ice rink is maintained by a 70-ton CIMCO chilling unit that rejects the heat to a rooftop mounted condenser unit. As mentioned, there is no recovery of the rejected heat. Automatic Control System The building systems are controlled by a DDC system. The dehumidifiers and ice refrigeration system are controlled from a local control panel. Lighting Interior lighting primarily consists of T8 fluorescent fixtures throughout the spaces and 1,000-watt metal halide pendant fixtures above the arena. The pendant fixtures are made with a special glass due to the potential for impact by hockey pucks. Exterior lighting primarily consists of compact fluorescent and metal halide lighting. Electric Equipment Additional kitchen equipment for the support of concessions operations is located in the concessions room. Treadwell Ice Arena 14 Energy Audit (December 2011) 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, and 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. Treadwell Ice Arena 15 Energy Audit (December 2011) 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 currently costs $3.80 per gallon for a seasonally adjusted blend of #1 and #2 fuel oil. The analysis is based on 6% fuel oil inflation which has been the average for the past 20-years. Propane Propane currently costs $3.49 per gallon. The analysis is based on 6% inflation – propane prices are fairly closely tied to that of fuel oil but with less volatility. Treadwell Ice Arena 16 Energy Audit (December 2011) Electricity Electricity is supplied by Alaska Electric Light & Power Company (AEL&P). The building is billed for electricity under AEL&P’s Rate 24. This rate 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. AEL&P determines the electric demand 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 electric charges, which includes a 24% rate hike that was recently approved: AEL&P Small Government Rate with Demand Charge 1 On-peak (Nov-May) Off-peak (June-Oct) Energy Charge per kWh 6.11¢ 5.92¢ Demand Charge per kW $14.30 $9.11 Service Charge per month $99.24 $99.24 Over recent history, electricity inflation has been less than 1% per year, which has lagged general inflation. An exception is the recent 24% rate hike that was primarily due to construction of additional hydroelectric generation at Lake Dorothy. This project affords the community a surplus of power which should bring electric inflation back to the historic rate of 1% per year. Load growth from electric heat conversions is likely to increase generating and distribution costs, especially if diesel supplementation is needed. Combining these two factors contribute to an assumed electricity inflation rate of 3%. 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 $0.094/kWh General Inflation Rate 2% Electricity Inflation 3% Fuel Oil Cost (2012) $3.80/gal Fuel Oil Inflation 6% Propane (2012) $3.49/gal Propane Inflation 6% Treadwell Ice Arena 17 Energy Audit (December 2011) Appendix A Energy and Life Cycle Cost Analysis Treadwell Ice Arena 18 Energy Audit (December 2011) 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 Treadwell Ice Arena Basis Economic Study Period (years) 25 Nominal Discount Rate 5%General Inflation 2% Energy 2011 $/gal Fuel Inflation 2012 $/gal Fuel Oil $3.52 6% $3.73 Electricity $/kWh (2011)$/kW (2011)Inflation $/kWh (2012)$/kW (2012) w/ Demand Charges $0.060 $12.14 3% $0.062 $12.50 w/o Demand Charges $0.094 -3% $0.097 - EEM-3: Install Heating Pipe Insulation Energy Analysis Service Size Length Bare BTUH Insul BTUH Factor kBtu η boiler Gallons Heating 0.50 3 61 10 100% -1,340 72%-13 Heating 0.75 20 74 11 100% -11,038 72%-111 Heating 2.00 4 154 15 100% -4,871 72%-49 -173 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Pipe Insulation 1/2"0 3 lnft $5 $15 3/4"0 20 lnft $5 $100 1"0 4 lnft $6 $24 Estimating contingency 0 15%$21 Overhead & profit 0 30%$48 Design fees 0 10%$21 Project management 0 8%$18 Energy Costs Fuel Oil 1 - 25 -173 gal $3.73 ($18,293) Net Present Worth ($18,000) EEM-4: 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 25 270 -67,500 80% -36,029 -383 Lavatories 0.3 0.2 300 270 -14,580 80% -7,782 -83 -82,080 -465 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Replace lavatory aerators 0 12 ea $35 $420 Replace showerhead 0 18 ea $35 $630 Energy Costs Water 1 - 25 -82 kgals $10.960 ($17,684) Fuel Oil 1 - 25 -465 gal $3.73 ($49,197) Net Present Worth ($65,800) Gallons per Use Treadwell Ice Arena 19 Energy Audit (December 2011) 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 Treadwell Ice Arena EEM-5: Install Door in Skate Rental Pass-through Energy Analysis CFM Tave Trm Hours MBH kBtu η boiler Gallons -150 38 70 2,190 -5 -11,563 68% -123 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install plexiglass door 0 1 LS $1,000 $1,000 Estimating contingency 0 15%$150 Overhead & profit 0 30%$345 Design fees 0 10%$150 Project management 0 8%$132 Annual Costs Exhaust fan maintenance 1 - 25 -1 LS $50.00 ($851) 1 - 25 $60.00 $0 1 - 25 $50.00 $0 Energy Costs Fuel Oil 1 - 25 -123 gal $3.73 ($12,985) Net Present Worth ($12,100) Treadwell Ice Arena 20 Energy Audit (December 2011) 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 Treadwell Ice Arena EEM-6: Install Refrigeration Heat Recovery Energy Analysis Refrigeration Heat Recovery Peak MBH Average Ave MBH COP Rejected MBH % Used Ave, MBH Boiler MBH % Load 840 60% 504 3.0 672 11% 598 764 88% Locker Room Heating Load HRV CFM ΔT η, HRV Peak MBH HRV-1 2,090 74 70% 51 HRV-2 2,360 74 70% 58 HRV-3 2,720 74 70% 66 Design MBH 175 175 Domestic Hot Water HWTs GPH ΔT MBH 5 266 80 887 Showers GPM ΔT MBH 240 3 2.0 80 240 415 Fuel Oil Fuel Oil, gal % Supplement Savings, gal 16,000 -90% -14,400 Pumping Energy Mode GPM Head η pump BHP η motor kW Hours kWh New P-3 52 65 55% 2.1 86.5% 1.8 7,200 12,909 1.8 12,909 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Heat Recovery System Heat recovery heat exchanger 0 1 LS $30,000 $30,000 4,000 gallon storage tank 0 1 LS $45,000 $45,000 Hydronic heating piping 0 1 LS $50,000 $50,000 Controls 0 1 LS $15,000 $15,000 Convert heating units to low temperature Primary pump and piping 0 1 LS $28,000 $28,000 Additional hot water makers 0 5 LS $10,000 $50,000 Replace unit heaters 0 5 LS $1,500 $7,500 Replace cabinet unit heaters 0 4 LS $2,200 $8,800 Replace finned tube heaters 0 1 LS $1,500 $1,500 Add HRV heating coils 0 3 LS $8,000 $24,000 Test and balance, commissioning 0 1 LS $5,000 $5,000 Estimating contingency 0 15% $39,720 Overhead & profit 0 30% $91,356 Design fees 0 10% $39,588 Project management 0 8% $34,837 Annual Costs Heat exchanger maintenance 1 - 25 1 ea $120.00 $2,043 Pump maintenance 1 - 25 2 ea $200.00 $6,811 Energy Costs Electric Energy 1 - 25 12,909 kWh $0.062 $15,683 Electric Demand 1 - 25 22 kW $12.50 $5,289 Fuel Oil 1 - 25 -14,400 gal $3.73 ($1,522,932) Net Present Worth ($1,022,800) Treadwell Ice Arena 21 Energy Audit (December 2011) 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 Treadwell Ice Arena EEM-7: Replace Zamboni Energy Analysis Zamboni Propane Uses/day Days Gal/Use Propane, gal/yr -14 270 0.48 -1,800 Electricity Uses/day Days kWh/use kWh 14 270 2.5 9,450 Dehumidification Btu/hr Water lb/hr Btu/lb water lb/gal Btu/gal BTU/gal Propane gal/gal h2o 250,000 60 4,167 8.34 34,750 91,000 0.38 Propane water/prop gal h2o propane, gal Zamboni -1,800 0.8 -1,440 -550 Humidity Zamboni gal/day lb / gal ft3 / lb CO2 / Prop Ventilation Air -7.0 4.2 8.3 3 OSA ave Rink Δ ppm hr/day cfm grains/lba grains/lb ft3/lb grains/lb gal h2o gal/pro 800 21 -726 43 22 12.5 7,000 -7,110 -2,715 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Electric Zamboni 0 1 LS $200,000 $200,000 Sell propane Zamboni 0 1 LS ($50,000) ($50,000) Project management 0 8% $12,000 Annual Costs Propane Zamboni maintenance 1 - 25 -1 ea $2,500.00 ($42,568) Electric Zamboni maintenace 1 - 25 1 ea $1,500.00 $25,541 Energy Costs Electric Energy (Effective Cost)1 - 25 9,450 kWh $0.097 $17,986 Propane 1 - 25 -5,065 gal $2.49 ($357,473) Net Present Worth ($194,500) Dehumidification Propane Propane Air Quality Treadwell Ice Arena 22 Energy Audit (December 2011) 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 Treadwell Ice Arena EEM-8: Optimize HRVs Energy Analysis HRV Heating Energy Unit CFM,ex η exist CFM,proposed η proposed ΔT Heat, kBtu η boiler Gallons HRV-1 2,090 60% 1,568 62% 30 -44,154 72%-443 HRV-2 2,720 60% 2,040 62% 30 -57,464 72%-576 HRV-3 2,330 60% 1,748 62% 30 -49,225 72%-494 7,140 5,355 -1,513 Locker Heating Energy Unit CFM,proposed η proposed ΔT Savings, kBtu η boiler Gallons HRV-3 1,748 62%-6 -24,398 72% -245 Fan Energy Unit ΔCFM ΔP η, fan # Fans Hours kW kWh HRV-1 -523 0.50 40%2 5,670 -0.2 -869 HRV-2 -680 0.50 40%2 5,670 -0.2 -1,131 HRV-3 -583 0.50 40%2 5,670 -0.2 -969 -1,785 -2,968 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Install VFD 0 6 ea $5,000 $30,000 Relocate thermostats 0 2 LS $500 $1,000 Controls 0 3 ea $10,000 $30,000 Estimating contingency 0 15%$9,150 Overhead & profit 0 30% $21,045 Design fees 0 10%$9,120 Project management 0 8%$8,025 Energy Costs Electric Energy 1 - 25 -2,968 kWh $0.062 ($3,606) Fuel Oil 1 - 25 -1,757 gal $3.73 ($185,854) Net Present Worth ($81,100) EEM-9: Dehumidify Using Recovered Heat Energy Analysis Propane Exist, gal Zamboni EEM Dehumid, gal 11,000 -5,065 -5,935 Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost Construction Costs Replace dehumidifier 0 1 LS $190,000 $190,000 Estimating contingency 0 15% $28,500 Overhead & profit 0 30% $65,550 Design fees 0 10% $28,405 Project management 0 8% $24,996 Annual Costs Propane dehumidifer maintenance 1 - 25 -1 ea $400.00 ($6,811) Free-Dry deumidifier maintenance 1 - 25 1 ea $200.00 $3,405 Energy Costs Propane 1 - 25 -5,935 gal $2.49 ($418,884) Net Present Worth ($84,800) Treadwell Ice Arena 23 Energy Audit (December 2011) 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 Treadwell Ice Arena EEM-10: Upgrade Motors Energy Analysis Equip Number HP ηold ηnew kW Hours kWh Brine Pump-1/2 2 3 86.5% 89.5% -0.13 5,256 -706 DH-1 1 5 87.5% 89.5% -0.07 2,891 -216 Cold Brine 1 20 88.5% 93.0% -0.67 5,256 -3,529 -0.9 -4,450 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 Replace motor 5 0 1 LS 1,290 $1,290 Replace motor 20 0 1 LS 3,160 $3,160 Energy Costs Electric Energy 1 - 25 -4,450 kWh $0.062 ($5,406) Electric Demand 1 - 25 -11 kW $12.50 ($2,597) Net Present Worth ($1,400) Treadwell Ice Arena 24 Energy Audit (December 2011) Appendix B Energy and Utility Data Treadwell Ice Arena 25 Energy Audit (December 2011) Alaska Energy Engineering LLC Billing Data 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Treadwell Ice Arena ELECTRIC RATE Electricity ($ / kWh )0.0611 0.0592 Demand ( $ / kW )14.30 9.11 Customer Charge ( $ / mo )99.24 99.24 Sales Tax ( % )0.0% 0.0% ELECTRICAL CONSUMPTION AND DEMAND kWh kW kWh kW kWh kW kWh kW Jan 66,320 165 69,760 182 62,800 182 68,960 181 66,960 Feb 76,640 163 79,720 180 74,800 171 76,960 182 77,030 Mar 70,800 169 77,160 178 74,320 182 79,360 181 75,410 Apr 73,800 163 71,040 179 73,200 182 74,280 182 73,080 May 25,400 164 16,840 162 19,960 178 14,960 36 19,290 Jun 11,480 40 8,040 28 9,160 40 7,080 35 8,940 Jul 10,440 41 8,240 36 8,640 40 8,600 33 8,980 Aug 66,320 168 57,440 169 47,720 181 45,400 163 54,220 Sep 79,160 162 63,200 162 70,680 167 64,200 161 69,310 Oct 79,480 161 80,600 178 72,880 177 81,840 169 78,700 Nov 92,520 166 79,240 181 84,600 182 90,480 184 86,710 Dec 79,600 181 78,480 182 76,880 182 72,800 182 76,940 Total 731,960 689,760 675,640 684,920 695,570 Average 60,997 145 57,480 151 56,303 156 57,077 141 57,964 Load Factor 57.5%52.0%49.6%55.5%148 ELECTRIC BILLING DETAILS Month Energy Demand Cust & Tax Total Energy Demand Cust & Tax Total % Change Jan 3,837 2,603 99 6,539 4,213 2,591 99 6,904 5.6% Feb 4,570 2,448 99 7,118 4,702 2,608 99 7,410 4.1% Mar 4,541 2,608 99 7,249 4,849 2,588 99 7,536 4.0% Apr 4,473 2,608 99 7,180 4,539 2,608 99 7,246 0.9% May 1,220 2,545 99 3,864 914 515 99 1,528 -60.5% Jun 560 368 99 1,027 433 319 99 851 -17.2% Jul 528 368 99 995 525 299 99 924 -7.2% Aug 2,916 1,651 99 4,666 2,774 1,487 99 4,360 -6.6% Sep 4,319 1,523 99 5,941 3,923 1,469 99 5,490 -7.6% Oct 4,453 1,614 99 6,167 5,000 1,538 99 6,637 7.6% Nov 5,169 2,603 99 7,871 5,528 2,631 99 8,259 4.9% Dec 4,697 2,608 99 7,405 4,448 2,603 99 7,150 -3.4% Total $ 41,282 $ 23,548 $ 1,191 $ 66,021 $ 41,849 $ 21,255 $ 1,191 $ 64,295 -2.6% Average $ 3,440 $ 1,962 $ 99 $ 5,502 $ 3,487 $ 1,771 $ 99 $ 5,358 -2.6% Cost ($/kWh)$0.098 65% 33% 2% $0.094 -3.9% Electrical costs are based on the current electric rates. 2009 2010 2010 AEL&P Electric Rate 24 On-Peak Nov-May Off-peak Jun-Oct Month 2007 2008 2009 Average Treadwell Ice Arena 26 Energy Audit (December 2011) Alaska Energy Engineering LLC Annual Electric Consumption 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Treadwell Ice Arena 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Use (kWh)Month of the Year Electric Use History 2007 2008 2009 2010 0 50 100 150 200 250 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Demand (kW)Month of the Year Electric Demand History 2007 2008 2009 2010 Treadwell Ice Arena 27 Energy Audit (December 2011) Alaska Energy Engineering LLC Electric Cost 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Treadwell Ice Arena 2010 $ 0 $ 1,000 $ 2,000 $ 3,000 $ 4,000 $ 5,000 $ 6,000 $ 7,000 $ 8,000 $ 9,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Cost (USD)Month of the Year Electric Cost Breakdown 2010 Electric Use (kWh) Costs Electric Demand (kW) Costs Customer Charge and Taxes 0 20 40 60 80 100 120 140 160 180 200 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 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 2010 Electric Use Electric Demand Treadwell Ice Arena 28 Energy Audit (December 2011) Alaska Energy Engineering LLC Annual Fuel Oil Consumption 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Treadwell Ice Arena Year 2,007 2,008 2,009 2,010 Average 16,170 16,981 16,107 14,424 15,921 9,124 9,124 9,124 9,124 9,124 1,800 1,800 1,800 1,800 1,800 9,282 9,093 9,284 9,013 26,845 Degree Days Fuel Oil - Heat Propane - Dehumidification Propane - Zamboni 0 2,000 4,000 6,000 8,000 10,000 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 2007 2008 2009 2010 Degree DayGallonsYear Annual Fuel Oil and Propane Use Fuel Oil ‐ Heat Propane ‐ Dehumidification Propane ‐ Zamboni Degree Days Treadwell Ice Arena 29 Energy Audit (December 2011) Alaska Energy Engineering LLC Annual Water Consumption 25200 Amalga Harbor Road Tel/Fax: 907-789-1226 Juneau, Alaska 99801 jim@alaskaenergy.us Treadwell Ice Arena Year Water 2,007 552,000 2,008 564,000 2,009 516,000 2,010 480,000 350,000 400,000 450,000 500,000 550,000 600,000 2007 2008 2009 2010Gallons of WaterYear Annual Water  Use Treadwell Ice Arena 30 Energy Audit (December 2011) 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 $3.52 $36.31 36,158 $4.05 155 Electricity $0.094 $28.96 Propane $2.31 $29.02 Source Cost Electricity 695,570 kWh $65,300 2,400 43% Fuel Oil 15,921 Gallons $56,000 2,200 39% Propane 10,924 Gallons $25,200 1,000 18% Totals $146,500 5,600 100% 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 Electricity PropaneCost $ / MMBtuCost of Heat Comparison Treadwell Ice Arena 31 Energy Audit (December 2011) Appendix C Equipment Data Treadwell Ice Arena 32 Energy Audit (December 2011) MotorHP / Volts / RPM / EfficHRV 1 Mezzanine Heat RecoveryHeatex E-50002090 cfm 2 HP/ 1740 RPM/ 480 V/ 87.5%Mezzanine Exhaust2 HP/ 480 V/ 1740 RPM/87.5%HRV 2 Mezzanine Heat RecoveryHeatex E-50002720 cfm 3 HP/ 480 V/ 1760 RPM/ 89.5%Mezzanine Exhaust3 HP/ 480 V/ 1760 RPM/ 89.5%DH 1 Mezzanine DehumidifierCimco DH-130-300 253 MBTU 5 HP/ 480 V/ 3490 RPM/ 87.5%Mezzanine De-Activation Blower6.5 HP/ 480 V/ 3486 RPM/ 88%LMA Mezzanine TransformerSquare D 30T3H30 KVANon TP rated EHWM 3 CustodialLockers 1-4/ Bathroom HW Amtrol WH1202CDW 120 GallonIndirect HW heaterHWM 4 CustodialLockers 1-4/ Bathroom HW Amtrol WH1202CDW 120 GallonIndirect HW heaterHWRP 1 CustodialDomestic HW Return Pump TACO DO3-B41/40 HP/115V/ 45 AMP/ 3250 RPM Runs 24/7WH 1 Concession Direct HW Heater Not Available6 Gallon 115 V/ 1500 Watts120° waterHWM 5Locker Rm MechanicalLocker Room 5/6 Amtrol WH1202CDW 120 GallonIndirect HW heaterHRV 3Locker Rm MechanicalLockers 5/6 Supply Innovent2 HP/ 480 V/ 1750 RPM/ 87.5%Locker Rm MechanicalLockers 5/6 Exhaust2 HP/ 480 V/ 1750 RPM/ 87.5%DH 2Locker Rm MechanicalMain Dehumidifier Blower Cameo235 MBTU 5 HP/ 480 V/ 3490 RPM/ 87.5%Locker Rm MechanicalDe-Activation Blower2 HP/ 480 V/ 3490 RPM/ 85%WH 2Locker Rm MechanicalOfficials Locker HW BradfordM250T60S-INCWW50 Gallon 208 V/ 3500 W upper/ lower Tied in to HW loopB 1 Boiler Room BoilerWeil McLain780753 MGHP 2 Boiler Room Boiler Circulation Pump TACO1/25 HP/ 115V/ 3250 RPMP 1 Boiler Room Boiler Circulation Pump Grundfos VPSEO-240F480 W/ 1700 WRunning high speedHWM 2 Boiler Room Zamboni HWAmtrol WH120ZCDW 120 GallonIndirect HW heaterTreadwell Ice Arena - Major Equipment InventoryCapacityNonesUnit IDLocation Function Make Model Treadwell Ice Arena 33 Energy Audit (December 2011) MotorHP / Volts / RPM / EfficTreadwell Ice Arena - Major Equipment InventoryCapacityNonesUnit IDLocation Function Make ModelHWM 1 Boiler Room Zamboni HWAmtrol WH120ZCDW 120 GallonIndirect HW heaterL1A Boiler Room TransformerSquare D 30 T3H30 KVANon TP ratedIcemaker Refrigeration Room IcemakerCIMCO 29504070 TRRefrigeration Room Warm Brine Pump 13 HP/ 480 V/1760 RPM/ 86.5%Refrigeration Room Warm Brine Pump 23 HP/ 480 V/1760 RPM/ 86.5%Refrigeration Room Cold Brine Pump20 HP/ 480 V/ 1760 RPM/ 91%Icemaker Refrigeration Room Compressor 170 HPRuns 75% timeRefrigeration Room Compressor 270 HPRuns 60-75% timeEF 1 Ice RinkExhaust FanGreenheck6000 CFM 1 1/2 HP/ 480 V/ 84%EF 2 Ice RinkExhaust FanGreenheck6000 CFM 1 1/2 HP/ 480 V/ 84%EF 3 Refrigeration Exhaust FanGreenheck250 CFM 1/20 HP/ 480 VEF 4 Refrigeration Exhaust FanGreenheck3000 CFM 3/4 HP/ 480 V/82%Zamboni Ice RinkIce ResurfacerZamboni 500 Treadwell Ice Arena 34 Energy Audit (December 2011) 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 Treadwell Ice Arena 35 Energy Audit (December 2011)