Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system
To analyze the dual-use characteristics of outdoor microchannel heat exchangers in electric vehicle heat pump systems, numerical calculation models of the heat transfer and pressure drop under different states were analyzed and selected. The heat transfer and flow characteristics of the heat exchang...
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doaj-ee199087af26438d8e314bf408aefaaa2021-08-26T04:35:19ZengElsevierEnergy Reports2352-48472021-11-01751305140Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump systemNi Liu0Qiang Cui1Huan Li2Kang Li3Yidong Fang4Lin Su5Hua Zhang6Xiaofeng Shan7Xiaotang Jin8School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China; Corresponding author at: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, ChinaShanghai Beite Technology Co. Ltd., Shanghai 201816, ChinaShanghai Beite Technology Co. Ltd., Shanghai 201816, ChinaTo analyze the dual-use characteristics of outdoor microchannel heat exchangers in electric vehicle heat pump systems, numerical calculation models of the heat transfer and pressure drop under different states were analyzed and selected. The heat transfer and flow characteristics of the heat exchanger were simulated and experimentally studied. Additionally, the heat transfer and flow performance of the heat exchanger under different wind velocities and process conditions were discussed, and the temperature uniformity on the surface was analyzed. The simulation results show that the calculated value and the experimental error of the heat exchanger performance are within 9%–15%. Regarding the refrigerant side, the number of internal holes in the flat tube and the aspect ratio of the internal holes should be appropriately selected according to the heat transfer effect and pressure drop based on the simulation. In addition, regarding the air side, the proper fin spacing and opening angle can improve the comprehensive performance. The experimental results for the heat pump system show that the comprehensive performance of a two-pass heat exchanger is better than a three-pass heat exchanger. Under low-temperature heating conditions, the temperature uniformity coefficient of the two-pass heat exchanger is 12% lower than that of the three-pass heat exchanger; thus, the two-pass heat exchanger exhibits a better heat exchange effect. It was found through experiments that a proper increase in the compressor speed can reduce the temperature uniformity coefficient when the outdoor heat exchanger is employed as an evaporator, thus making the refrigerant distribution more uniform.http://www.sciencedirect.com/science/article/pii/S2352484721006740Electric vehicleMicrochannel heat exchangerHeat pumpTemperature uniformity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ni Liu Qiang Cui Huan Li Kang Li Yidong Fang Lin Su Hua Zhang Xiaofeng Shan Xiaotang Jin |
spellingShingle |
Ni Liu Qiang Cui Huan Li Kang Li Yidong Fang Lin Su Hua Zhang Xiaofeng Shan Xiaotang Jin Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system Energy Reports Electric vehicle Microchannel heat exchanger Heat pump Temperature uniformity |
author_facet |
Ni Liu Qiang Cui Huan Li Kang Li Yidong Fang Lin Su Hua Zhang Xiaofeng Shan Xiaotang Jin |
author_sort |
Ni Liu |
title |
Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system |
title_short |
Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system |
title_full |
Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system |
title_fullStr |
Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system |
title_full_unstemmed |
Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system |
title_sort |
investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system |
publisher |
Elsevier |
series |
Energy Reports |
issn |
2352-4847 |
publishDate |
2021-11-01 |
description |
To analyze the dual-use characteristics of outdoor microchannel heat exchangers in electric vehicle heat pump systems, numerical calculation models of the heat transfer and pressure drop under different states were analyzed and selected. The heat transfer and flow characteristics of the heat exchanger were simulated and experimentally studied. Additionally, the heat transfer and flow performance of the heat exchanger under different wind velocities and process conditions were discussed, and the temperature uniformity on the surface was analyzed. The simulation results show that the calculated value and the experimental error of the heat exchanger performance are within 9%–15%. Regarding the refrigerant side, the number of internal holes in the flat tube and the aspect ratio of the internal holes should be appropriately selected according to the heat transfer effect and pressure drop based on the simulation. In addition, regarding the air side, the proper fin spacing and opening angle can improve the comprehensive performance. The experimental results for the heat pump system show that the comprehensive performance of a two-pass heat exchanger is better than a three-pass heat exchanger. Under low-temperature heating conditions, the temperature uniformity coefficient of the two-pass heat exchanger is 12% lower than that of the three-pass heat exchanger; thus, the two-pass heat exchanger exhibits a better heat exchange effect. It was found through experiments that a proper increase in the compressor speed can reduce the temperature uniformity coefficient when the outdoor heat exchanger is employed as an evaporator, thus making the refrigerant distribution more uniform. |
topic |
Electric vehicle Microchannel heat exchanger Heat pump Temperature uniformity |
url |
http://www.sciencedirect.com/science/article/pii/S2352484721006740 |
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