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Effects of injection-port angle and internal heat exchanger length in vapor injection heat pumps for electric vehicles

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  • Jung, Jongho
  • Jeon, Yongseok
  • Cho, Wonhee
  • Kim, Yongchan

Abstract

Vapor injection heat pumps have been proposed for cabin heating in electric vehicles (EVs) to improve the performance and reliability under severe weather conditions. However, the geometric optimizations of the injection-port and internal heat exchanger (IHX) in vapor injection heat pumps designed for EVs have rarely been investigated. The objective of this study is to investigate the effects of the injection-port angle and IHX length in a vapor injection heat pump for use in EVs at various startup conditions. The heating performance of a vapor injection heat pump with R134a is measured by varying the IHX length from 100 to 400 mm and injection-port angle from 320° to 440° at various cabin temperatures. The effects of the IHX length and injection-port angle are analyzed in terms of coefficient of performance (COP) and heating capacity. The optimum IHX length and injection-port angle for the maximum COP are determined to be 300 mm and 400°, respectively.

Suggested Citation

  • Jung, Jongho & Jeon, Yongseok & Cho, Wonhee & Kim, Yongchan, 2020. "Effects of injection-port angle and internal heat exchanger length in vapor injection heat pumps for electric vehicles," Energy, Elsevier, vol. 193(C).
    • Handle: RePEc:eee:energy:v:193:y:2020:i:c:s0360544219324466
    DOI: 10.1016/j.energy.2019.116751
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    References listed on IDEAS

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    1. Baek, Changhyun & Heo, Jaehyeok & Jung, Jongho & Cho, Honghyun & Kim, Yongchan, 2014. "Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions," Energy, Elsevier, vol. 77(C), pages 570-578.
    2. Ahn, Jae Hwan & Kang, Hoon & Lee, Ho Seong & Jung, Hae Won & Baek, Changhyun & Kim, Yongchan, 2014. "Heating performance characteristics of a dual source heat pump using air and waste heat in electric vehicles," Applied Energy, Elsevier, vol. 119(C), pages 1-9.
    3. Cho, Il Yong & Seo, HyeongJoon & Kim, Dongwoo & Kim, Yongchan, 2016. "Performance comparison between R410A and R32 multi-heat pumps with a sub-cooler vapor injection in the heating and cooling modes," Energy, Elsevier, vol. 112(C), pages 179-187.
    4. Zhang, Zhenying & Wang, Jiayu & Feng, Xu & Chang, Li & Chen, Yanhua & Wang, Xingguo, 2018. "The solutions to electric vehicle air conditioning systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 443-463.
    5. Qin, Fei & Zhang, Guiying & Xue, Qingfeng & Zou, Huiming & Tian, Changqing, 2017. "Experimental investigation and theoretical analysis of heat pump systems with two different injection portholes compressors for electric vehicles," Applied Energy, Elsevier, vol. 185(P2), pages 2085-2093.
    6. Ahn, Jae Hwan & Lee, Joo Seong & Baek, Changhyun & Kim, Yongchan, 2016. "Performance improvement of a dehumidifying heat pump using an additional waste heat source in electric vehicles with low occupancy," Energy, Elsevier, vol. 115(P1), pages 67-75.
    7. Kim, Dongwoo & Chung, Hyun Joon & Jeon, Yongseok & Jang, Dong Soo & Kim, Yongchan, 2017. "Optimization of the injection-port geometries of a vapor injection scroll compressor based on SCOP under various climatic conditions," Energy, Elsevier, vol. 135(C), pages 442-454.
    8. Ahn, Jae Hwan & Kang, Hoon & Lee, Ho Seong & Kim, Yongchan, 2015. "Performance characteristics of a dual-evaporator heat pump system for effective dehumidifying and heating of a cabin in electric vehicles," Applied Energy, Elsevier, vol. 146(C), pages 29-37.
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    Cited by:

    1. Zhang, Nan & Lu, Yiji & Ouderji, Zahra Hajabdollahi & Yu, Zhibin, 2023. "Review of heat pump integrated energy systems for future zero-emission vehicles," Energy, Elsevier, vol. 273(C).
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    3. Jing, Siqi & Chen, Qi & Yu, Jianlin, 2024. "Analysis of an ejector-assisted flash tank vapor injection heat pump cycle with dual evaporators for dryer application," Energy, Elsevier, vol. 286(C).
    4. Maeng, Heegyu & Kim, Jinyoung & Kwon, Soonbum & Kim, Yongchan, 2023. "Energy and environmental performance of vapor injection heat pumps using R134a, R152a, and R1234yf under various injection conditions," Energy, Elsevier, vol. 280(C).
    5. Wang, Jijin & Qv, Dehu & Yao, Yang & Ni, Long, 2021. "The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study," Energy, Elsevier, vol. 221(C).

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