||Evaluation of Alternatives for HFC-134A Refrigerant in Motor Vehicle Air Conditioning.
Jetter, J. J. ;
Smith, N. D. ;
Ratanaphruks, K. ;
Ng, A. S. ;
Tufts, M. W. ;
||Environmental Protection Agency, Research Triangle Park, NC. National Risk Management Research Lab. ;Acurex Environmental Corp., Research Triangle Park, NC.
Air conditioning ;
Environmental chemical substitudes ;
Motor vehicles ;
Performance evaluation ;
Thermophysical properties ;
Thermodynamic properties ;
Vapor compression refrigeration cycle ;
Coefficient of performance ;
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HFC (hydrofluorocarbon)-134a is currently used as the refrigerant in motor vehicle air conditioners. The EPA's (Environmental Protection Agency's) NRMRL (National Risk Management Research Laboratory) has evaluated lower global warming alternatives for HFC-134a in motor vehicle air conditioning. Alternative technologies were evaluated. Four pure chemicals and one azeotropic mixture were identified and evaluated as alternative refrigerants for conventional systems, but were found to be unsuitable. The four pure chemicals were HFC-227ca, HFC-227ea, HFC-245cb, and HFE (hydrofluoroether)-143a. The azeotropic mixture was 51.7 weight percent HFC-134 and 48.3 weight percent HFC-245cb. The evaluation process and results are described in this paper.