三级自动复叠系统混合工质配比设计与验证

Design and inspect of mix refrigerants used in three-stage auto-cascade refrigeration cycle

为了确定应用于三级自动复叠系统的混合工质,说明了混合工质组分确定的方法,并据此为一台设备选取了R134a/R23/R14/R50作为制冷剂。通过提出了一些理想状态假设之后,简化制冷剂在制冷系统中的循环过程。忽视非必须制冷剂R50对系统的影响,认为系统中只有R134a/R23/R14进行制冷循环。利用串联热平衡法计算了各组分的循环流量,以R14的循环量作为对比单位,与实验得出的最佳配比进行比较。通过分析误差原因,指出了在实际设备制造过程中根据计算结果确定混合工质配比的可行性。

In order to select the mix refrigeration used in three-stage auto-cascade system, some notes were pointed out for choosing the component, R134a/R23/R14/RSO were chosen as a mix for the equipment. After simplifying the refrigeration cycle process in the system and giving out some suppose in ideal, RS0 was ignored for not necessary and it was considered that there was only R134a/R23/R14 in the cycle. Each component cycle flow in the cycle was calculated with series heat balance method and compared with the best component ratio,which was suggested according to experiment result with the flow quantity of R14 as a unit. After analyzing the reason which caused the error,the feasibility was pointed out for selecting the mixture refrigerant component ratio in actual device manufacturing process by calculating.