A search for replacements for CFC-12 in automotive air conditioning has led to the discovery of near azeotropelike ternary blends of HCFC-22, HFC-152a, and CFC-114 or HCFC-124. Ozone depletion potential is reduced to 0.42 with the blend containing CFC-U4, and to 0.03 with the blend containing HCFC-124. The blends provide automotive cooling performance slightly better than CFC-12, have good oil/refrigerant/metals stability, and will not become flammable during hose permeation or vapor leaks. Based on initial tests, the blends appear to be viable CFC-12 replacements for vehicles equipped with nylon lined refrigerant hoses, alkylbenzene oil as compressor lubricant, and possibly molecular sieve desiccant of three Angstrom pore size.
Evaluation of Fluorocarbon Blends as Automotive Air Conditioning Refrigerants
Sae Technical Papers
SAE International Congress and Exposition ; 1989
01.02.1989
Aufsatz (Konferenz)
Englisch
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