摘要
本文基于传热单元法,建立了冷凝器的稳态分布参数模型。分别以R22及其3种替代产品(R407C,R410A,R134A)为工质,运用该模型详细比较了在流量变化及风量变化两种情况下2排管冷凝器的换热和流动特性。结果表明: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,换热量及进出口压降的变化趋势基本一样。四种工质中,R410A性能较好(换热量最大,压降最低),但其冷凝压力比R22高出60%左右,R134A由于压降较大,两者都不是R22的理想替代物。R407C与R22在换热量及压降方面最为接近,是其理想的替代工质。
Based on the, 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 two - rows counter-flow condensers which used the refrigerant replacement of R22 （R407C, R410A, R134A） are studied. Among the characteristic comparison of four refrigerants condensers, The heat transfer rate of R410A condensers is better than the other refrigerants condensers, but its condense pressure is much higher than that of R22, the pressure drop of R134A condensers is too high, both of the two refrigerant replacement are not the perfect replacements. The heat transfer rate of R407C condensers is 3% - 5% higher than R22 condensers and the pressure drop of R407C condensers is 5% - 10% lower than R22. R407c is the ideal refrigerant replacement of R22.
出处
《制冷》
2005年第2期11-14,共4页
Refrigeration
关键词
冷凝器
替代工质
流程布置
数值模拟
Condensers, Refrigerant replacement, Refrigerant circuitry, Numerical simulation
