摘要

A wide range of measurements was performed on the performance of the refrigerants R134a, R-290 (propane), R-404A, R-407c, R-410A, and R-22 in a vapor compression experimental set-up. The results were used to evaluate and compare the following performance criteria: cooling capacity, coefficient of performance, compressor discharge temperature, input power, refrigerant mass flow, pressure ratio, and volumetric refrigeration capacity. The measurements were taken over a wide range of evaporating temperatures from −20 °C to 200 °C at a condensing temperature of 55 °C on the same experimental set-up. This wide selection of evaporating temperatures makes it possible to predict the performance of air-conditioning and refrigeration equipment. The results were used to compare the performances of the different refrigerants as possible substitutes for R-22. It was concluded that propane is a good long-term replacement for R-22.