Warehouses-NC-v4 EAc6: Enhanced refrigerant management

  • Think ahead to earn the credit

    This credit rewards projects that select mechanical equipment and refrigerants with lower ozone depletion and global warming impacts. The credit calculation takes several other variables into account—including equipment life, refrigerant leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608)., and the ratio of coolant charge to cooling capacity—in order to determine compliance.

    All permanently installed HVAC&R equipment with more than 0.5 lbs of refrigerant—including chillers; unitary HVAC equipment (split and packaged); room and window air-conditioners; computer, data center, and telecom room cooling units; and commercial refrigeration equipment—is addressed by this credit. 

    This is a relatively easy credit to achieve if your project has a centralized cooling plant, with a favorable “coolant charge to cooling capacity” ratio. But even for projects with smaller, more dispersed units, this credit should be achievable if you consider the credit requirements early. The best way to confirm compliance is to run the calculations as soon as an HVAC system is proposed.

    If your project already has designed an HVAC system and now wants to change the refrigerant to meet the credit, you will find that it may not be as simple as swapping out the coolant or the compressor unit for a more environmentally benign choice. Rather, your entire HVAC system may have to be resized to accommodate the different capacities and efficiencies of the newer units.

    What’s New in LEED v4

    • Commercial refrigeration equipment must now meet sector-specific requirements.

    FAQs

    How can I determine the leakage rate of my equipment?

    Only the default leakage rate of 2% is accepted in the credit calculations.

    I'm working on a renovation project and we'll be keeping some of the existing equipment. Should we include these systems in our calculations?

    All HVAC&R equipment that will serve the project building should be included in the calculations. 

    Should all commercial refrigerant equipment be accounted for, including both upright and under-counter? What about walk-in refrigerators? Ice makers?

    Any permanently installed piece of equipment containing greater than 0.5 lbs. of refrigerant and included in the project scope should be included in calculations.

    What is the required timeline for completing a CFC phase-out for this credit?

    While a phase-out is allowed in the prerequisite, this credit is like other credits in that it must be achieved as part of the LEED scope of work. The work should be completed during construction.

  • EA Credit 6: Enhanced refrigerant management

    Intent

    To reduce ozone depletion and support early compliance with the Montreal Protocol while minimizing direct contributions to climate change1. Climate change refers to any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). (U.S. Environmental Protection Agency, 2008) 2.The increase in global average temperatures being caused by a buildup of CO2 and other greenhouse gases in the atmosphere. This temperature change is leading to changes in circulation patterns in the air and in the oceans, which are affecting climates differently in different places. Among the predicted effects are a significant cooling in Western Europe due to changes in the jet stream, and rising sea levels due to the melting of polar ice and glaciers..

    Requirements

    Option 1. No refrigerants or low-impact refrigerants (1 point)

    Do not use refrigerants, or use only refrigerants (naturally occurring or synthetic) that have an ozone depletion potential (ODPOzone Depletion Potential (ODP) is a measure of ozone impact a chemical has relative to CFC-11 (trichlorofluoromethane), which has a ODP of 1. ) of zero and a global warming potential (GWPGlobal Warming Potential (GWP) is a measure of substances’ ability to absorb heat and warm the atmosphere relative to carbon dioxide, which has a GWP of 1, over a given time period. ) of less than 50.

    OR

    Option 2. Calculation of refrigerant impact (1 point)

    Select refrigerants that are used in heating, ventilating, air-conditioning, and refrigeration (HVAC&R) equipment to minimize or eliminate the emission of compounds that contribute to ozone depletion and climate change1. Climate change refers to any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). (U.S. Environmental Protection Agency, 2008) 2.The increase in global average temperatures being caused by a buildup of CO2 and other greenhouse gases in the atmosphere. This temperature change is leading to changes in circulation patterns in the air and in the oceans, which are affecting climates differently in different places. Among the predicted effects are a significant cooling in Western Europe due to changes in the jet stream, and rising sea levels due to the melting of polar ice and glaciers.. The combination of all new and existing base buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). and tenant HVAC&R equipment that serve the project must comply with the following formula:

    IP units  

    LCGWP + LCODP x 105 100
    SI units

    LCGWP + LCODP x 105 13
    Calculation definitions for LCGWP + LCODP x 105 ≤ 100

    (IP units)
    Calculation definitions for LCGWP + LCODP x 105 ≤ 13

    (SI units)
    LCODP = [ODPr x (Lr x Life +Mr) x Rc]/Life LCODP = [ODPr x (Lr x Life +Mr) x Rc]/Life
    LCGWP = [GWPr x (Lr x Life +Mr) x Rc]/Life LCGWP = [GWPr x (Lr x Life +Mr) x Rc]/Life
    LCODP: Lifecycle Ozone Depletion Potential

    (lb CFC 11/Ton-Year)
    LCODP: Lifecycle Ozone Depletion Potential

    (kg CFC 11/(kW/year))
    LCGWP: Lifecycle Direct Global Warming Potential

    (lb CO2Carbon dioxide/Ton-Year)
    LCGWP: Lifecycle Direct Global Warming Potential

    (kg CO2/kW-year)
    GWPr: Global Warming Potential of Refrigerant

    (0 to 12,000 lb CO2/lbr)
    GWPr: Global Warming Potential of Refrigerant

    (0 to 12,000 kg CO2/kg r)
    ODPr: Ozone Depletion Potential of Refrigerant

    (0 to 0.2 lb CFC 11/lbr)
    ODPr: Ozone Depletion Potential of Refrigerant

    (0 to 0.2 kg CFC 11/kg r)
    Lr: Refrigerant Leakage RateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608).

    (2.0%)
    Lr: Refrigerant Leakage Rate

    (2.0%)
    Mr: End-of-life Refrigerant Loss

    (10%)
    Mr: End-of-life Refrigerant Loss

    (10%)
    Rc: Refrigerant Charge

    (0.5 to 5.0 lbs of refrigerant per ton of gross AHRI rated cooling capacity)
    Rc: Refrigerant Charge

    (0.065 to 0.65 kg of refrigerant per kW of AHRI rated or Eurovent Certified cooling capacity)
    Life: Equipment Life

    (10 years; default based on equipment type, unless otherwise demonstrated)
    Life: Equipment Life

    (10 years; default based on equipment type, unless otherwise demonstrated)



    For multiple types of equipment, calculate a weighted average of all base building HVAC&R equipment, using the following formula:

    IP units     SI units
    ∑ ( LCGWP + LCODP x 105 ) x Qunit ≤ 100 ∑ ( LCGWP + LCODP x 105 ) x Qunit ≤ 13
    Qtotal Qtotal



    Calculation definitions for

    [ ∑ (LCGWP + LCODP x 105) x Qunit ] / Qtotal ≤ 100

    Calculation definitions for

    [ ∑ (LCGWP + LCODP x 105) x Qunit ] / Qtotal ≤ 13

    (IP units) (SI units)
    Qunit = Gross AHRI rated cooling capacity of an individual HVAC or refrigeration unit (Tons) Qunit = Eurovent Certified cooling capacity of an individual HVAC or refrigeration unit (kW)
    Qtotal = Total gross AHRI rated cooling capacity of all HVAC or refrigeration Qtotal = Total Eurovent Certified cooling capacity of all HVAC or refrigeration (kW)



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Apr 23 2017
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