流程布置对管翅式冷凝器综合性能的影响

Effect of refrigerant circuitry on comprehensive performance for finned-tube condenser

研究了管程布置对环保制冷剂R410A空调系统的冷凝器综合性能的影响.首先与试验数据进行了比较,对模拟软件的准确性进行校核;然后针对5种典型的双排冷凝器布置,系统探讨了结构布置、流路合并点对冷凝器换热及压降的影响.研究发现：制冷剂质量流量较小时,不同的管程布置对冷凝器的换热和压降性能影响较小;当质量流量变大时,管程布置的影响变大.冷凝器后半段并管处理可一定程都上改善其整体换热均匀性,最佳并管点区间宜选在干度0.1~0.4位置,以满足换热和压降的综合平衡性能要求.

The effects of refrigerant circuitry on the comprehensive performance of finned-tube condensers were investigated with R410 A as working fluid. Compared with experimental data,the accuracy of simulation software Coil-Designer was verified. For the five kinds of typical layout of condensers,the effects of structural layout and refrigerant circuits merging on condenser heat transfer and pressure drop were investigated. The results show that the tube-side arrangement has slight effect on heat transfer rate and pressure drop of condenser for low refrigerant mass flow rate,while that has large effect for large mass flow rate. The merging method for different branch can improve the uniformity of overall heat transfer rate. The appropriate merging points are located in the quality range of vapor-liquid mixture from 0. 1 to0. 4,which is the balance of comprehensive performance between heat transfer rate and pressure drop for condensers.