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PERFORMANCE OF CHLORINE-FREE BINARY ZEOTROPIC REFRIGERANT MIXTURES IN A HEAT PUMP
Citation:
Pannock, J. AND D. Didion. PERFORMANCE OF CHLORINE-FREE BINARY ZEOTROPIC REFRIGERANT MIXTURES IN A HEAT PUMP. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-92/017.
Description:
The report gives results of a study that uses a simulation model and an experimental heat pump apparatus with counterflow heat exchangers to show that two hydrofluorocarbon (HFC) refrigerant mixtures, HFC-32/-152a and HFC-32/-134a, may be considered to be replacements for hydrochlorofluorocarbon (HCFC)-22 if the appropriate mixture compositions are chosen. ata indicate that multiple tradeoffs exist in mixture performance for different compressor speeds and mixture compositions. f the results for the HFC-32 1-152a mixture are compared at the same compressor speed and capacity at which the HCFC-22 results were obtained, the improvements over HCFC-22 range from 14% for the high-temperature cooling mode to 2% for the low-temperature heating mode. he global warming potential of the tested mixture is about 25% of the value of HCFC-22. owever, this azeotropic mixture is flammable in the whole composition range. est results for the HFC-32/-134a mixture, for mixtures containing more than 35 mass percent of HFC-32, show similar performance to the HFC-32/1-134a mixture. Since HFC-134a is not flammable, the HFC-32/1-134a mixture exists in a certain range as a nonflammable mixture. he test results for both mixtures show no problems with respect to extreme pressures or temperatures in the composition range tested.