Entry Type ID Date Applicable Rating System Primary Credit Inquiry (LIs) Ruling (LIs) Related Addenda/LIs Related Resources Campus Applicable Internationally Applicable Country Applicability Reference Guide (Addenda) Page (Addenda) Location (Addenda) Description of Change (Addenda) "LEED Interpretation" "10039" "2011-05-09" "New Construction, Existing Buildings, Core and Shell, Schools - New Construction" "In the calculation of EAc4, is it acceptable to count the quantitative cooling loads addressed directly by the direct/indirect evaporative cooling units, that would otherwise be met with chillers, so that the refrigerant in walk-in refrigerators is not given an unfair weight in the calculations?" "As the walk-in refrigerators are not part of the base building HVAC systems they are excluded from the requirements of this credit, provided that the total capacity of this equipment represents less than 15% of the total building installed HVAC capacity.\n\n **Update October 1, 2013: Per the rating system requirements, all refrigeration included as part of the scope of work of the project, and having more than 0.5 pounds of refrigerant must be included in the EA Credit 4 analysis, not matter what percentage of the overall HVAC capacity. This interpretation only allows exclusion of walk-in refrigerators that are not part of the base building (meaning that these systems are outside of the scope of work of the project)." "None" "None" "X" "LEED Interpretation" "2088" "2008-05-27" "Existing Buildings" "We are attempting to satisfy option B (because we use HCFC refrigerants): The building fire suppression system does not contain CFCs, HCFCs or Halons and we are keeping computerized maintenance records over the performance period to document that leakage rate of refrigerants are kept to less than 3% of total charge, per year as per EPA rules. But the next requirement is to ""reduce the leakage over the remainder of the unit life to below 25%"". How can we document that and satisfy this requirement? Is there a calculation/extrapolation method that we can use? Or after we document the leakage percentage per year per piece of equipment can we multiply that with the expected life expectancy of that equipment and come up with a calculated leakage rate for the life of the equipment?" "The average annual leakage percentage per year per piece of equipment may be multiplied with the expected remaining life expectancy of that equipment to show that the leakage rate over the remainder of unit life is being maintained below 25%. If there were no refrigerant refills conducted to any applicable piece of equipment during the performance period, document back to the last previous refill and adjust the percent refrigerant lost to be a percent annual loss to calculate the percent leakage rate over the remainder of unit life. Documentation of the leakage rate should include for each applicable HVAC&R system: 1. The refrigerant type used in the unit 2. The most recent refrigerant refill amount 3. The time elapsed between most recent refill and previous refill 4. Total refrigerant capacity of the chiller 5. Expected remaining life of the unit 6. Calculation of the percent annual refrigerant leakage rate [% per year] (see Equation 1 below): Equation 1 = [(Refrigerant lost since last refill [lbs.] / Total refrigerant contained in the Unit [lbs.]) / (Time between refrigerant refills [years])] " "None" "None" "X"