电动汽车空调热泵微通道换热器扁管布置方式对制热性能的影响

本文针对电动汽车空调热泵系统的室内微通道换热器制热性能进行了研究.首先对换热器的流程排布进行了优化分析,得到四流程12-13-13-12模型性能最优.在优化分析的基础上,实验研究了室内换热器扁管横竖布置方式对单体及系统制热性能的影响.结果发现在单体实验中,扁管竖置布置时的内部制冷剂分布均匀度远好于扁管横置布置,其换热量与出风温度比扁管横置布置分别提高了11.2%~16.5%与6.3%~8.4%.系统制热实验结果表明,扁管横置布置的制冷剂分布均匀度仍小于扁管竖置布置,且其受压缩机转速影响较大.而当扁管竖置布置时,制冷剂分布均匀度随着压缩机转速增大而减小.而随着室外环境温度的降低,扁管竖置布置的优势减弱。

Influence of Flat Tube Arrangement of Microchannel Heat Exchanger for Electric Vehicle Air Conditioning Heat Pump on Heating Performance

In this work, the heating performance of the indoor micro-channel heat exchanger of the electric vehicle air-conditioning heat pump system was investigated. First, the process layout of the heat exchanger was optimized and analyzed, and the best performance of the four process 12-13-13-12 model was obtained. On the basis of optimization analysis, the effect of the horizontal and vertical layout of the indoor heat exchanger flat tubes on the heating performance of the unit and the system was experimentally studied. The results showed that the uniformity of the internal refrigerant distribution for the flat tube arranged vertically was much better than that of the flat tube arranged horizontally. Moreover, the heat exchange and outlet air temperature were increased by 11.2%~16.5% and 6.3%~8.4% respectively compared with the horizontal arrangement of the flat tube. The system heating experiment results showed that the refrigerant distribution uniformity of the horizontal arrangement of the flat tube was still less than that of the vertical arrangement of the flat tube, and it was greatly affected by the compressor speed. When the flat tube was arranged vertically, the uniformity of refrigerant distribution decreased as the compressor speed increased. However, as the outdoor environment temperature decreased, the advantage of the refrigerant distribution uniformity for vertical arrangement of the flat tubes was weakened.