Performance of residential air-conditioning systems with flow maldistribution in fin-and-tube evaporators
Performance of residential air-conditioning systems with flow maldistribution in fin-and-tube evaporators
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DOI：
10.1016/j.ijrefrig.2010.12.010
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发表时间：
2011-05
期刊：
影响因子：
--
通讯作者：
M. R. Kærn;W. Brix;B. Elmegaard;L. Larsen
中科院分区：
文献类型：
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作者：
M. R. Kærn;W. Brix;B. Elmegaard;L. Larsen
采用数值模拟的方法研究了家用空调翅片管式蒸发器内制冷剂和气流分布的不均匀性。翅片管换热器通常具有预定义的回路。然而，本研究的目的是以独立的方式对每个分布不均来源进行一般调查。因此，蒸发器和冷凝器被简化为直管，用于本研究的目的。本文介绍了R410 A系统的数值模型及其验证，并对单个分布不均匀源进行了研究。感兴趣的分布不均的来源是：入口液相/气相分布，进料管弯曲和气流分布。结果表明，分布不均降低了系统的制冷量和性能系数。特别是，不同的相分布和不均匀的气流分布显着降低性能。不同的进料管弯曲只会导致性能略有下降。
Refrigerant and airflow maldistribution in fin-and-tube evaporators for residential air-conditioning was investigated with numerical modeling. Fin-and-tube heat exchangers usually have a pre-defined circuitry. However, the objective in this study was to perform a generic investigation of each individual maldistribution source in an independent manner. Therefore, the evaporator and the condenser were simplified to be straight tubes for the purposes of this study. The numerical model of the R410A system, its verification and an investigation of individual maldistribution sources are presented in this paper. The maldistribution sources of interest were: inlet liquid/vapor phase distribution, feeder tube bending and airflow distribution. The results show that maldistribution reduced the cooling capacity and the coefficient of performance of the system. In particular, different phase distribution and non-uniform airflow distribution reduced the performance significantly. Different feeder tube bendings only caused a minor decrease in performance.