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Environmental characteristics of some refrigerants:

Refrigerant Atmospheric

Lifetime (vrs)

GWP (100th vr ITH)

(integrated time horizon)

HCFC's

HCFC-22

HCFC-123

HCFC-141b

12.1

.055

1500 90 600

HFC's

HFC-134a HFC-32 HFC-152a HFC-245fa

1300 650 140 820

HC's

HC-290 (propane)

Zeotropes and Azeotropes

R-404A R-407A R-407C R-410A

3260 1770 1530 1730

HFC's are free from chlorine and have zero ozone depleting potential (ODP) However their GWP is much higher than the GWP of natural fluids such as hydrocarbons, carbon dioxide, ammonia and water. The latter are therefore the most likely long-term candidates for replacing HFC's. They may well become the future standard in their industry. A case in point is the use of supercritical carbon dioxide technology for mobile air-conditioning and other applications.

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