L型与U型热交换器性能理论分析与实验研究

Theoretical analysis and experimental study on the performance of type L and U heat exchangers

房间空调器室外机管翅式热交换器主要存在L型折弯和U型折弯两种结构形式,其对换热的主要影响差异因素为风速场以及局部阻力造成的压降和局部二次环流影响的扰动,为探究两种不同形式热交换器对整机性能的具体影响,本文对两种形式热交换器的换热效果从理论分析、数值建模以及实际焓差室能力测试来进行分析比较。数值模拟以及能力测试结果显示,在同一整机系统下,L型与U型热交换器对整机能力以及能效的影响差异较小,两者能力能效基本相当。

There are two types of pipe fin heat exchanger in room air conditioner,which are mainly L bending and U bending.The main influence factors of heat transfer are wind velocity field,pressure drop caused by local resistance and disturbance of local two circulation,to explore the specific effects of two different types of heat exchangers on the performance of the machine.The heat transfer effect of the two types of heat exchangers is analyzed and compared from theoretical analysis,numerical modeling and actual enthalpy chamber capability test.The results of numerical simulation and ability test show that,under the same whole machine system,the difference between L and U heat exchangers has little effect on the ability and efficiency of the whole machine,and their ability energy efficiency is basically equal.