Experimental Study on R600a/R32 Used in Self Stacking Cryogenic Refrigerator
In this paper,a self-cascade refrigeration system for a small cryogenic refrigerator is designed and built.The cycle performance of R600a/R32 and R600a/R290 refrigerant combinations is compared and analyzed experimentally.The experimental results show that the R600a/R32 combination is more in line with the working conditions of-50℃cryogenic refrigerators.This paper further compares the system cycle characteristics of R600a/R32 under different charging ratios through experiments,and obtains that the optimal charging ratio of R600a/R32 is 0.61/0.39.Under this ratio,when the ambient temperature is 25℃,the freezing chamber temperature of the system can reach-51.8℃.Due to the space limitation of a small refrigeration unit,some operating parameters cannot be measured.In this paper,an analysis model of refrigeration operating data is proposed.Key data are calculated using the heat transfer balance of the regenerator and the mass conservation of the gas-liquid separator,and the ratio of the total operating concentration of the mixed working medium is obtained to analyze the system performance.
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