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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Energy engineering     
Temperature maldistribution in micro-channel heat exchanger applied to electrical vehicle’s heat pump air conditioning
WU Jiang hong, XUE Zhi qiang, JIN Peng, LI Hui xi
1. College of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China; 
2. Beijing Automotive Research Institute Limited Company Beijing 101300, China;
3. Ingersoll Rand (China) Limited Company Guangzhou 510620, China
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Abstract  

Surface temperature maldistribution(STM) of micro-channel heat exchanger(MCHE) was analyzed and its influence to performance of heat pump air conditioning system (HPACS) for electrical vehicles was discussed. Performance of HPACS which had applied designed inlet distributor was tested. STM of outdoor MCHE under cooling/heating working condition was monitored by infrared radiometer.Temperature unevenness (χ) of areas vertical to the flow direction was adopted to evaluate MCHE’s STM. Two BP neural networks were construted to predict cooling/heating performance under different working condition, refrigerant flow and STM. Influence weights of inputs to output were obtained for BP neural networks. Results show that when MCHEs are used as condenser and evaporator, influence weights of STM to the HPACS’s performance are 34.97% and 43.90% respectively. It is more beneficial to improve refrigerant maldistribution of two-phase flow than gas-phase flow.

Published: 01 August 2016
CLC:  TK 172  
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WU Jiang hong, XUE Zhi qiang, JIN Peng, LI Hui xi. Temperature maldistribution in micro-channel heat exchanger applied to electrical vehicle’s heat pump air conditioning. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(8): 1537-1544.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.08.016     OR     http://www.zjujournals.com/eng/Y2016/V50/I8/1537


电动汽车热泵空调微通道换热器温度分布特性

为了探讨微通道换热器温度分布特性对电动汽车热泵空调系统性能的影响,对应用新型微通道换热器入口分配器的电动汽车热泵系统进行性能测试,采用红外热成像仪记录制冷/制热工况下车外换热器温度分布变化情况.采用与换热器沿程方向垂直的温度不均匀度χ(温度标准方差)作为微通道换热器温度不均特性的度量.建立制冷制热工况2个BP神经网络模型,预测在不同运行工况、制冷剂流量、温度分布特性情况下系统的能效.神经网络的权重分析结果表明：对于所设计的电动汽车热泵空调系统,当微通道换热器被用作冷凝器和蒸发器时,换热器表面温度分布不均对系统性能的影响权重分别为34.97%和43.90%,改善气液两相的分配均匀性比改善气相的分配均匀性更利于系统性能的提升.

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