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| 油循环率对电动汽车CO2热泵系统性能的影响 |
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邹慧明1,2, 汤鑫斌1,2, 唐坐航1,2, 唐明生1, 田长青1,2
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| (1.中国科学院理化技术研究所 空间功热转换技术重点实验室;2.中国科学院大学) |
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| 摘要: |
| 本文搭建了一套带油循环率测试装置的电动汽车CO2热泵系统实验台，实验研究了典型车辆工况下热泵系统油循环率对压缩机与热泵性能的影响，实验结果表明：制冷工况下，油循环率由1.17%升至5.26%时，压缩机容积效率和等熵效率分别提升13.6%和5.6%；制热工况下，油循环率由1.51%升至6.68% 时，压缩机容积效率和等熵效率分别提升7.19%和15.7%，压缩机排温由155.5 ℃降至146 ℃；相较于高温段气冷器流阻和换热，油循环率对低温段蒸发器影响更大，高温段换热器流阻仅为低温段的28%；根据油循环率对热泵系统整体性能影响分析，油循环率在4%附近时热泵系统具有较佳的综合性能。 |
| 关键词: 油循环率 CO2 电动汽车 热泵系统 |
| DOI： |
| Received:March 13, 2022Revised:April 27, 2022 |
| 基金项目: |
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| Effect of Oil Circulation Rate on the Performance of CO2 Heat Pump System for Electric Vehicles |
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Zou Huiming1,2, Tang Xinbin1,2, Tang Zuohang1,2, Tang Mingsheng1, Tian Changqing1,2
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| (1.Key Laboratory of Science and Technology on Space Energy Conversion, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences;2.University of Chinese Academy of Sciences) |
| Abstract: |
| In this study, a CO2 heat pump system test bench for electric vehicles with an oil circulation rate testing device was built to investigate the influence of the oil circulation rate on the performance of the compressor and the heat pump under typical vehicle operating conditions. Under refrigeration conditions, the increase in the oil circulation rate from 1.17% to 5.26% increased the volumetric and isentropic efficiencies of the compressor by 13.6% and 5.6%, respectively, Under heating conditions, when increasing the oil circulation rate from 1.51% to 6.68%, the volumetric and isentropic efficiencies of the compressor increased by 7.19% and 15.7%, respectively, while the discharge temperature of the compressor decreased from 155.5 °C to 146 °C. Unlike the flow resistance and heat exchange capacity of the air cooler in the high-temperature section, the oil circulation rate exhibited a significant effect on the evaporation process in the low-temperature section. The analysis of the influence of the oil circulation rate on the overall performance of the heat pump system demonstrated that the heat pump system performance improved when the oil circulation rate is approximately 4%. |
| Key words: oil circulation rate CO2 electric vehicle heat pump system |
