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为了解决目前应用于低温冷柜的制冷剂环保问题,本文对碳氢化合物应用于低温冷柜以替代R404A等传统的低温制冷剂进行了研究。本文编写了制冷剂循环性能程序,比较了R404A、R290、R290/DME(wt%:80/20)和R290/R134A(wt%:50/50)在低温工况下的热力学循环性能。基于商业冷柜SRL-CD2075HA,实验研究了R290及其二元混合物的最佳冲灌量和降温速度。结果表明:R290、R290/DME(wt%:80/20)和R290/R134A(wt%:50/50)的循环性能系数优于R404A,其系统耗功也比R404A系统低;R404A、R290、R290/DME(wt%:80/20)和R290/R134A(wt%:50/50)的最优充灌量分别为600 g、250 g、235 g和440 g。在同等条件下,R290及其二元混合工质完全可以达到R404A的制冷效果。
In order to solve the environmental problems of refrigerants currently used in cryogenic freezers, this paper studies the application of hydrocarbons to cryogenic freezers to replace traditional cryogenic refrigerants such as R404A. In this paper, a refrigerant cycle performance program has been compiled to compare the thermodynamic cycle performance of R404A, R290, R290 / DME (wt%: 80/20) and R290 / R134A (wt%: 50/50) at low temperature. Based on the commercial refrigerator SRL-CD2075HA, the optimal rinsing and cooling rate of R290 and its binary mixture were experimentally studied. The results show that the cycling performance coefficient of R290, R290 / DME (wt%: 80/20) and R290 / R134A (wt%: 50/50) is better than that of R404A, The optimum filling amounts of R290 / DME (wt%: 80/20) and R290 / R134A (wt%: 50/50) were 600 g, 250 g, 235 g and 440 g, respectively. Under the same conditions, R290 and its binary mixture can fully achieve the cooling effect of R404A.