Green Building Dictionary

 

Fig. 3: Chemical Refrigerants

Examples of chemicals used as HVAC refrigerants and for other purposes with their R-number, Ozone Depletion Potential (ODP), and Global Warming Potential (GWP) values. ODP and GWP values are from “The Treatment by LEED® of the Environmental Impact of HVAC Refrigerants” by the TSAC HCFC Task Group, September 28, 2004, available from www.usgbc.org/Docs/LEED_tsac/TSAC_Refrig_Report_Final-Approved.pdf accessed on May 25, 2007.

R number

Chemical Name

Classification

Trade Name

ODP

GWP

R11

Trichlorofluoromethane

CFC-11

Freon 11

1.0

4,680

R12

Dichlorodifluoromethane

CFC-12

Freon 12, Halon 122

1.0

10,720

R22

Chlorodifluoromethane

HCFC-22

Freon 22

0.04

1,780

R23

Trifluoromethane

HFC-23

Freon 23

4x10-4

12,240

R123

2,2-Dichloro-1,1,1-trifluoroethane

HCFC-123

SUVA 123

0.02

76

R134a

1,1,1,2-Tetrafluoroethane

HFC-134a

 

10-5

1,300

R290

Propane

 

Duracool

0

3

R407C

Mix of R-32/R-125/R-134a (23/25/52)

 

 

10-5

1,700

R410A

Difluoromethane and Pentafluoroethane

HFC-410A

Puron

10-5

1,890

R717

Ammonia

 

 

0

0

R718

Water

 

 

0

0

R744

Carbon Dioxide

 

 

0

1