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Novel optimized operating strategies of two-phase injection heat pumps for achieving best performance with safe compression

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  • Kim, Dongwoo
  • Myeong, Seongryeol
  • Cha, Dowon
  • Kim, Yongchan

Abstract

Two-phase injection (TPI) is known to be an effective technique in reducing the discharge temperature and increasing the heating performance of heat pumps. However, for actual applications of TPI heat pumps, optimized operating strategies to guarantee increased energy saving potential with safe compression are still not available. The objectives of this study are to analyze the optimum operating conditions and propose novel optimized operating strategies of TPI heat pumps for achieving best performance with safe compression. The performance of the TPI heat pump is measured as a function of the injection quality, outdoor temperature, and compressor frequency. The optimum and safe injection qualities for achieving maximum performance and high reliability are determined in various operating conditions. Moreover, three novel optimized operating strategies for injection quality in the TPI heat pump are proposed based on the empirical correlations for the electronic expansion valve, injection pressure, and discharge superheat, respectively. In addition, the operating characteristics of these optimized operating strategies are compared to provide a selection guide for actual applications.

Suggested Citation

  • Kim, Dongwoo & Myeong, Seongryeol & Cha, Dowon & Kim, Yongchan, 2019. "Novel optimized operating strategies of two-phase injection heat pumps for achieving best performance with safe compression," Energy, Elsevier, vol. 187(C).
    • Handle: RePEc:eee:energy:v:187:y:2019:i:c:s0360544219316093
    DOI: 10.1016/j.energy.2019.115925
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    References listed on IDEAS

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    1. Kim, Dongwoo & Song, Kang Sub & Lim, Junyub & Kim, Yongchan, 2018. "Analysis of two-phase injection heat pump using artificial neural network considering APF and LCCP under various weather conditions," Energy, Elsevier, vol. 155(C), pages 117-127.
    2. 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.
    3. Redón, A. & Navarro-Peris, E. & Pitarch, M. & Gonzálvez-Macia, J. & Corberán, J.M., 2014. "Analysis and optimization of subcritical two-stage vapor injection heat pump systems," Applied Energy, Elsevier, vol. 124(C), pages 231-240.
    4. 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.
    5. Qv, Dehu & Dong, Bingbing & Cao, Lin & Ni, Long & Wang, Jijin & Shang, Runxin & Yao, Yang, 2017. "An experimental and theoretical study on an injection-assisted air-conditioner using R32 in the refrigeration cycle," Applied Energy, Elsevier, vol. 185(P1), pages 791-804.
    6. 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.
    7. 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.
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    Cited by:

    1. 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).
    2. Kim, Dongwoo & Lee, DongChan & Lee, Minwoo & Chung, Hyun Joon & Kim, Yongchan, 2021. "Energy performance evaluation of two-phase injection heat pump employing low-GWP refrigerant R32 under various outdoor conditions," Energy, Elsevier, vol. 214(C).

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