Enhanced Refrigerant Management

LEED 2.2 Requirements:

OPTION 1 Do not use refrigerants.

OR

OPTION 2 Select refrigerants and HVAC&R that minimize or eliminate the emission of compounds that contribute to ozone depletion and global warming. The base building HVAC&R equipment shall comply with the following formula, which sets a maximum threshold for the combined contributions to ozone depletion and global warming potential:

LCGWP + LCODP x 105 ≤ 100

Where:
LCODP = [ODPr x (Lr x Life +Mr) x Rc]/Life
LCGWP = [GWPr x (Lr x Life +Mr) x Rc]/Life
LCODP: Lifecycle Ozone Depletion Potential (lbCFC11/Ton-Year)
LCGWP: Lifecycle Direct Global Warming Potential (lbCO2/Ton-Year)
GWPr: Global Warming Potential of Refrigerant (0 to 12,000 lbCO2/lbr)
ODPr: Ozone Depletion Potential of Refrigerant (0 to 0.2 lbCFC11/lbr)
Lr: Refrigerant Leakage Rate (0.5% to 2.0%; default of 2% unless otherwise demonstrated)
Mr: End-of-life Refrigerant Loss (2% to 10%; default of 10% unless otherwise demonstrated)
Rc: Refrigerant Charge (0.5 to 5.0 lbs of refrigerant per ton of cooling capacity)
Life: Equipment Life (10 years; default based on equipment type, unless otherwise demonstrated)

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

[ Σ (LCGWP + LCODP x 105) x Qunit ] / Qtotal ≤ 100 Where:

Qunit = Cooling capacity of an individual HVAC or refrigeration unit (Tons)
Qtotal = Total cooling capacity of all HVAC or refrigeration Small HVAC units (defined as containing less than 0.5 lbs of refrigerant), and other equipment such as standard refrigerators, small water coolers, and any other cooling equipment that contains less than 0.5 lbs of refrigerant, are not considered part of the 'base building' system and are not subject to the requirements of this credit.
AND
Do not install fire suppression systems that contain ozone-depleting substances (CFCs, HCFCs or Halons).

Submittals (DESIGN):

- Enter into the Template the HVAC&R equipment types, including number, size (tons), refrigerant, and refrigerant charge.
- Provide a narrative describing any special circumstances or calculation explanations. AND (For Projects With Special Circumstances)
- Provide an optional narrative to describe any additional comments or notes regarding special circumstances or considerations regarding the project's credit approach.