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【摘要】 在设定工况条件下,采用3组CO2非共沸混合工质(R744/R22、R744/R1270、R744/R600a),对制冷系统进行了热力学理论分析和计算。研究了系统制冷量、压缩机功耗、制冷COPr和冷凝压力随CO2质量配比的变化关系。结果表明:在相同工况下,R744/R600a的冷凝压力最低,比R744/R22平均低22.9%,比R744/R1270平均低18.8%;R744/R1270具有较好的综合性能。 【Abstract】 Under the design operating conditions,the performances of a refrigerating system was analyzed by using three groups of CO2 zeotropic mixture refrigerants(R744/R22,R744/R1270,R744/R600a) respectively.The influence of CO2 composition on refrigerating capacity,compressor power,COPr at cooling mode and condensing pressure was investigated.The results show that under same operating conditions the high pressure of system using R744/R600a is minimum,which is averagely lower than that of R744/R22 by 22.9%,R744/R1270 by 18.8%.R744/R1270 has a better comprehensive characteristics. 【关键词】 CO2; COPr; 非共沸混合工质; 理论分析 【Key words】 CO2; COPr; zeotropic mixture refrigerant; theoretical analysis