Effect of Refrigerant on Thermodynamic Performance of Compression-refrigeration with Internal Heat Exchanger
A theoretical model of a single-stage compression refrigeration system with internal heat recovery is established.Fifteen kinds of dry and wet refrigerants with different critical temperatures are selected,and the effects of the physical properties of refrigerants on the refrigeration capacity,volumetric refrigeration capacity and the ratio of refrigeration coefficient are analyzed.The results show that when the condensation temperature is 60 ℃ and the evaporation temperature is 10 ℃,the system refrigeration capacity of all refrigerants increases with the increase of superheat.Overall,the refrigeration capacity of HFC refrigerants is larger,followed by HFO refrigerants,and FC refrigerants are the least.For the ratio of volumetric refrigerating capacity to refrigerating coefficient,R22,R32 and ammonia decrease with the increase of superheat,while other working fluids increase with the increase of superheat,which indicates that R22,R32 and ammonia are unfavorable to the regenerative cycle.
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