流程布置对R407C冷凝器性能的影响

Numerical Study of Refrigerant Circuitry in R407C Condensers

本文基于传热单元法，建立了冷凝器的分布参数模型。以R407C为工质，运用该模型详细分析了四种不同流程布置两排管冷凝器的换热和流动特性，并与以R22为工质的冷凝器进行了性能比较。结果表明：采用R407C为工质时，四种流程布置中，无论是随着管内冷媒流量的变化，还是随着冷凝器迎风面风速的变化，逆流布置换热效果都是最好，换热量比顺流高约5％-40％，压降比顺流高约3％-10％，其次是错流布置，顺流布置最差。在与以R22为工质的冷凝器性能比较中，无论是随着管内冷媒流量的变化，还是随着迎风面风速的变化，R407C冷凝器换热量都比R22冷凝器高约3％-5％，压降低约5％-10％，是其理想的替代产品。

Based on the ε - NTU , a steady state distributed parameters model was put forward in the numerical simulation of refrigerant circuitry in condensers in this paper.Applying this model, the heat transfer and flow characteristics of four different two - rows condensers are studied. The research indicates that the counter- flow condensers have a better performance than other anangements.The heat transfer rate of counter- flow condensers is 5% - 40% higher than that of parallel - flow condensers and the pressure drop of counter- flow condensers is 3% ~ 10% higher than that of parallel- flow condensers. Between the characteristic comparison of the two refrigerant condensers, the heat transfer rate of R407C condensers is 3% ~ 5% higher than that of R22 condensers and the pressure drop of R407C condensers is 5% ~ 10% lower than that of R22 condensers. R407e is the perfect refrigerant replacement of R22.