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THERMODYNAMIC EVALUATION OF FIVE ALTERNATIVE REFRIGERANTS IN VAPOR-COMPRESSION CYCLES
Citation:
Kazachki, G. AND C. Gage. THERMODYNAMIC EVALUATION OF FIVE ALTERNATIVE REFRIGERANTS IN VAPOR-COMPRESSION CYCLES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-91/159.
Description:
The paper gives results of a thermodynamic evaluation of five alternative refrigerants in a vapor-compression refrigeration cycle, utilizing throttling, super-heating, and combined throttling and superheating. ive alternative refrigerants (R32, R125, R134a, R143a, and R152a) were considered for refrigerants R12, R22, and R502. hermodynamically, the best alternative for R12 in a wide range of evaporation and condensing temperatures is R152a, which should be applied in a cycle without internal heat exchange. he second alternative is R134a, which should be applied in a cycle with internal heat exchange. etween R143a and R125, both of which should be applied in a cycle with internal heat exchange, the better replacement thermodynamically for R502 is R143a, particularly at high condensing temperatures. t low condensing temperatures, R125 is to be considered, especially if extended internal heat exchange is applied. s a replacement for R502, R32 has good performance and much higher volumetric capacity. owever, excessively high discharge temperatures contraindicate its use, particularly with hermetic and semi-hermetic compressors. o internal heat exchange should be applied with R32, and extreme care should be taken to prevent superheating in suction lines.