Homes-v2008 EAc11: Residential refrigerant management
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
11.1 Refrigerant charge test. Provide proof of proper refrigerant charge of the air-conditioning system (unless home has no mechanical cooling system).Credits
11.2 Appropriate HVAC refrigerants (1 point). Do one of the following:a. Do not use refrigerants.b. Install an HVAC system with non-HCFC refrigerant (e.g., R-410a).c. Install an HVAC system with a refrigerant that complies with the following equation. (See Table 1 for examples of the equation applied to R410a used in different system sizes.) LCGWP + LCODP x 10^5 ≤ 160 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 (lb CFC11/ton-year) LCGWP = Lifecycle Direct Global Warming Potential (lb CO2/ton-year) GWPr = Global Warming Potential of Refrigerant (0–12,000 lb CO2/lbr) ODPr = Ozone Depletion Potential of Refrigerant (0–0.2 lb CFC11/lbr) Lr = Refrigerant Leakage Rate (0.5–2.0%; default of 2% unless otherwise demonstrated) Mr = End-of-life Refrigerant Loss (2.0–10%; default of 10% unless otherwise demonstrated) Rc = Refrigerant Charge (0.50–5.0 lbs of refrigerant per ton of cooling capacity) Life = Equipment Life (10–35 years; default based on equipment type, unless otherwise demonstrated)Table 1 Examples of Residential Refrigerants Eligible for EA 11.2
Refrigerant |
Combined LCGWP+ LCODP score |
System size |
Refrigerant charge |
Leakage rate |
Equipment life |
|---|---|---|---|---|---|
R410a |
152 |
2 tons |
3.7 lb/ton |
1.5% |
15 years |
R410a |
151 |
3 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
151 |
4 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
121 |
5 tons |
3.0 lb/ton |
2.0% |
15 years |
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
11.1 Refrigerant charge test. Provide proof of proper refrigerant charge of the air-conditioning system (unless home has no mechanical cooling system).Credits
11.2 Appropriate HVAC refrigerants (1 point). Do one of the following:a. Do not use refrigerants.b. Install an HVAC system with non-HCFC refrigerant (e.g., R-410a).c. Install an HVAC system with a refrigerant that complies with the following equation. (See Table 1 for examples of the equation applied to R410a used in different system sizes.) LCGWP + LCODP x 10^5 ≤ 160 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 (lb CFC11/ton-year) LCGWP = Lifecycle Direct Global Warming Potential (lb CO2/ton-year) GWPr = Global Warming Potential of Refrigerant (0–12,000 lb CO2/lbr) ODPr = Ozone Depletion Potential of Refrigerant (0–0.2 lb CFC11/lbr) Lr = Refrigerant Leakage Rate (0.5–2.0%; default of 2% unless otherwise demonstrated) Mr = End-of-life Refrigerant Loss (2.0–10%; default of 10% unless otherwise demonstrated) Rc = Refrigerant Charge (0.50–5.0 lbs of refrigerant per ton of cooling capacity) Life = Equipment Life (10–35 years; default based on equipment type, unless otherwise demonstrated)Table 1 Examples of Residential Refrigerants Eligible for EA 11.2
Refrigerant |
Combined LCGWP+ LCODP score |
System size |
Refrigerant charge |
Leakage rate |
Equipment life |
|---|---|---|---|---|---|
R410a |
152 |
2 tons |
3.7 lb/ton |
1.5% |
15 years |
R410a |
151 |
3 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
151 |
4 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
121 |
5 tons |
3.0 lb/ton |
2.0% |
15 years |