Influence of Flow Layout on Performance of External Heat Exchanger of Heat Pumps in Electric Vehicles

doi:10.11908/j.issn.0253-374x.21621

Home > Archive>Volume 51, Issue 7, 2023 >1114-1123. DOI:10.11908/j.issn.0253-374x.21621

Influence of Flow Layout on Performance of External Heat Exchanger of Heat Pumps in Electric Vehicles
DOI:
                        10.11908/j.issn.0253-374x.21621
                    
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                        ZHAO Lanping1ZHAO Lanping
School of Mechanical Engineering，Tongji University，Shanghai 201804，China
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BAO Guo1,2BAO Guo
School of Mechanical Engineering，Tongji University，Shanghai 201804，China;Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems，Tongji University，Shanghai 201804，China
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ZHENG Qinyue1,2ZHENG Qinyue
School of Mechanical Engineering，Tongji University，Shanghai 201804，China;Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems，Tongji University，Shanghai 201804，China
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YANG Zhigang2YANG Zhigang
Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems，Tongji University，Shanghai 201804，China
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Affiliation:1.School of Mechanical Engineering，Tongji University，Shanghai 201804，China;2.Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems，Tongji University，Shanghai 201804，China
Clc Number:TK 172
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Abstract:

Based on the uneven distribution of refrigerant flow， a thermal-hydraulic simulation mode for the external heat exchanger of heat pumps in electric vehicles was built， and it is found that the overall performance of the layout of single-pass as well as 4-pass is in an inferior position. Compared with that of the 2-pass configuration， the heat transfer capacity of the single-pass configuration is decreases by 25.3% in summer and 23.3% in winter wet conditions， respectively. The difference between the heat transfer capacities of the configurations of 4-pass， 3-pass， and 2-pass is insignificant. The refrigerant side pressure drops of the structures of 4-pass and 3-pass are 2.5~2.8 and 1.8~2.5 times those of the structure of 2-pass， respectively. The experimental results of the system show that， under various operating conditions， the coefficient of performance （COP） of the heat pump system with the 2-pass external heat exchanger is higher than that of the heat pump system with the 3-pass external heat exchanger. Under wet operating conditions in winter， the heating capacity and COP of the system with the 2-pass external heat exchanger are increased by 6.4% and 9.4%， respectively， compared to those of the system with the 3-pass external heat exchanger. It is concluded that the 2-pass structure is more suitable for the external heat exchanger of heat pumps in electric vehicles.

Key words:electric vehicle heat pump;parallel flow heat exchanger outside the vehicle;flow layout;heat transfer capacity;refrigerant side pressure drop

Reference

[1] ZOU Y, TUO H, HRNJAK P S. Modeling refrigerant maldistribution in microchannel heat exchangers with vertical headers based on experimentally developed distribution results [J]. Applied Thermal Engineering, 2014, 64 (1/2): 172.

[2] 赵宇,祁照岗,陈江平.微通道平行流蒸发器流程布置研究与分析[J].制冷学报, 2009, 30 (1): 25.ZHAO Yu,QI Zhaogang,CHEN Jiangping. Flow configuration in micro-channel parallel flow evaporator [J].Journal of Refrigeration, 2009, 30 (1): 25.

[3] 严瑞东,徐博,陈江平,等. 微通道换热器两相分配特性对空调系统性能的影响[J]. 制冷学报, 2013, 34 (3):20.YAN Ruidong, XU Bo, CHEN Jiangping, et al. The impact on air conditioning system of two-phase distribution in microchannel heat exchanger [J]. Acta Refrigeration, 2013, 34 (3): 20.

[4] 胡莎莎,苏林,韩南奎,等. 不同流程布置及迎面风速下的微通道冷凝器性能研究[J]. 制冷技术, 2020, 40 (5): 22.HU Shasha, SU Lin, HAN Nankui, et al. Research on performance of micro-channel condenser with different flow layout and headwind speed [J]. Refrigeration Technology, 2020, 40 (5): 22.

[5] BENOUALI J, PETITJEAN C, CITTI I, et al. Evaporator-condenser improvement and impact on heat pump system performances for EVs [EB/OL]. [2021-10-21].https://doi.org/10.4271/2014-01-0708

[6] LIU N, CUI Q, LI H, et al. Investigating the performance optimization of an outdoor condenser–evaporator for an electric vehicle heat pump system [J]. Energy Reports, 2021, 7: 5130.

[7] REN T, HRNJAK P. Pressure drop in round cylindrical headers of parallel flow MCHXs: Pressure loss coefficients for single phase flow [J]. International Journal of Refrigeration, 2015, 49: 119.

[8] WANG T, GU B, WU B, et al. Modeling for multi-pass parallel flow condenser with the effect of refrigerant mal-distribution [J]. International Journal of Refrigeration, 2015, 60: 234.

[9] 赵兰萍,高磊,刘彦麟,等. 进风条件对平行流冷凝器性能的影响[J]. 同济大学学报(自然科学版), 2018, 46 (1):109.ZHAO Lanping, GAO Lei, LIU Yanlin, et al. The influence of air inlet conditions on the performance of parallel flow condensers [J]. Journal of Tongji University (Natural Science Edition), 2018, 46 (1):109.

[10] TUO H, HRNJAK P. Effect of the header pressure drop induced flow maldistribution on the microchannel evaporator performance [J]. International Journal of Refrigeration, 2013, 36(8): 2176.

[11] CHANG Y J, WANG C C. A generalized heat transfer correlation for louver fin geometry [J]. International Journal of Heat and Mass Transfer, 1997, 40(3): 533.

[12] 祁照岗.汽车空调部件及系统性能优化研究[D].上海:上海交通大学, 2008.QI Zhaogang. Research on performance optimization of automotive air-conditioning components and systems [D]. Shanghai: Shanghai Jiaotong University, 2008.

[13] KIM M H, BULLARD C W. Air-side thermal hydraulic performance of multi-louvered fin aluminum heat exchangers [J]. International Journal of Refrigeration, 2002, 25(3): 390.

[14] GNIELINSKI V. New equations for heat and mass-transfer in turbulent pipe and channel flow [J]. International Chemical Engineering, 1976, 16(2): 359.

[15] DOBSON M K, CHATO J C. Condensation in smooth horizontal tubes [J]. Journal of Heat Transfer-Transactions of the ASME, 1998, 120(1): 193.

[16] KANDLIKAR S G, STEINKE M E. Predicting heat transfer during flow boiling in mini-channels and micro-channels [J]. ASHRAE Transactions, 2003, 109(1): 1.

[17] YANG C Y, WEBB R L. Friction pressure drop of R-12 in small hydraulic diameter extruded aluminum tubes with and without micro-fins [J]. International Journal of Heat and Mass Transfer, 1996, 39(4): 801.

[18] FRIEDEL L. Improved friction pressure drop correlations for horizontal and vertical two-phase pipeflow [C]// European Two-Phase Flow Group Meeting. Ispra: [S.n.], 1979: Paper E2.

[19] IDELCHIK I E. Handbook of Hydraulic Resistance [M]. New York: Begell House, 1996.

[20] COLEMAN J W, KRAUSE P E. Two phase pressure losses of R134a in microchannel tube headers with large free flow area ratios [J]. Experimental Thermal and Fluid Science, 2004, 28(2/3): 123.

[21] COLLIER J G, THOME J R. Convective boiling and condensation [M]. Oxford: Clarendon Press, 1994.

[22] YIN J M, BULLARD C W, HRNJAK P S. Single-phase pressure drop measurements in a microchannel heat exchanger [J]. Heat Transfer Engineering, 2002, 23(4): 3.

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ZHAO Lanping, BAO Guo, ZHENG Qinyue, YANG Zhigang. Influence of Flow Layout on Performance of External Heat Exchanger of Heat Pumps in Electric Vehicles[J].同济大学学报(自然科学版),2023,51(7):1114~1123

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Received:December 30,2021
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Online: July 25,2023
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