Experimental investigation of refrigerant fluid mixture of R134a/R152a in heat pumps

Cooling the coolant fluid selection is one of the important parametersfor the vapour compression system. The applications of vapourcompressed refrigeration system with R12 have been extensivelyutilized in world and our country for a long time. However, theutilization of R12 has been prohibited since it had damaget to ozonelayer. R134a and R152a have been produced as alternative refrigerantto R12.In this study, the valves of performance of mixture R134a and R152a atdifferent mass measure was observed as experimental in heat pumps.Vapour temperature, condenser pressure and ratio of mixture wereconsidered as experiment parameters. Thermodynamic valves ofrefrigerant mixtures were obtained from REFPROP 7.0 softwareaccording to the temperature and pressure valves which were observedin experimental unit. The valves of performance are calculated withusing equations that defined by first and second thermodynamic rules.In this study, depending on the experimental parameters, coefficients ofperformance and proportional efficiency valves were calculated. Thesevalves are given as relative in table and graphic. According to results,depending on increasing of rate of R152a refrigerant fluid, coefficientsof performance are improving among %5 and %23 in heating, improvingamong %6 and %28 in cooling.