||Investigation of HFC-236ea and HFC-236fa as CFC-114 Replacements in High-Temperature Heat Pumps.
Kazachki, G. S. ;
Gage, C. L. ;
Hendriks, R. V. ;
Rhodes, W. J. ;
||Acurex Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Environmental chemical substitutes ;
Air pollution abatement ;
Heat pumps ;
Performance evaluation ;
Cooling rate ;
Coefficient of performance
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The paper discusses a thermodynamic analysis of HFC-236ea and HFC-236fa as ozone-safe CFC-114 alternatives in a vapor-compression cycle at high-temperature heat-pump conditions. The cooling capacities and the coefficients of performance (COPs) are evaluated. Parameters assessed as criteria for performance evaluation and for reliable performance were: cooling capacity; electric power input, current, and voltage; COP; compressor volumetric and isentropic efficiencies; and discharge, winding, and oil temperatures. With all three refrigerants, the compressor ran 1800 hours without failure and without indication of excessive noise or vibration.