Performance Evaluation of Chlorine Free Zeotropic Refrigerant Mixtures in Heat Pumps Computer Study and Tests

摘要

Fifteen binary zeotropic refrigerant mixtures consisting of the components R 23, R32, R125, R134a, , R143a, and R152a are investigated as possible replacement fluids for R22. The two mixtures of R32/R134a abd R32/R152a showed COP imporvements over R22 of up to 24% (depending on the ooperating condition and mixture composition) at the same capacity as with R22 while using counter flow heat exchange in evaporator and condenser. The use of a liquid line to suction line heat exchanger proved to be advantageous for both mixtures. The overall conductance for both mixtures is evaluated to be equal to or up to 22% greater (R32/R152a) than that of R22. Therfore, the heat exchanger size used with R22 should be sufficient to achieve performance increases with these zeotropic mixtures.