流程布置对R410A冷凝器性能的影响研究

Influence of refrigerant circuitry on performance of R410A condensers

本文基于效率-传热单元法,建立了空冷式冷凝器的分布参数模型。以R410A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R410A为工质时,四种流程布置中,无论是随着管内制冷剂流量的变化,还是随着冷凝器迎风面风速的变化,逆流布置换热效果最好,换热量比顺流高约5～15%,压降比顺流高约3～20%,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,无论是随着管内制冷剂流量的变化,还是随着迎风面风速的变化,R410A冷凝器换热量都比R22高约6～15%,压降低约30～50%。本研究结论为冷凝器流程布置的优化和设计提供了一定的理论基础和指导方向。

Based on the ε - NTV, a steady state distributed parameters model was put forward in the numerical simulation of refrigerant circuitry in condensers in this paper. The heat transfer and flow characteristics of four different refrigerant circuitry two - rows condensers with R410A. The research results indicate that the counter- flow condensers have a better performance than other arrangements. The heat transfer rate of eounter - flow condensers is 5 - 15% higher than that of parallel - flow condensers and the pressure drop of counter - flow condensers is 3 - 20% higher than that of parallel - flow eondensers. Between the characteristic comparison of the two refrigerant condensers （ R410A and R22）, the heat transfer rate of R410A condensers is 6 - 15% higher than that of R22 condensers and the pressure drop of R410A condensers is 30 -50% lower than that of R22 condensers. All these results supply the theory basis and guide direction for the optimized design of refrigerant circuitry in eondensers.