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Performance evaluation of a gas injection CO2 heat pump according to operating parameters in extreme heating and cooling conditions

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  • Chung, Hyun Joon
  • Baek, Changhyun
  • Kang, Hoon
  • Kim, Dongwoo
  • Kim, Yongchan

Abstract

The objective of this study is to optimize the performance of a gas injection CO2 heat pump according to the operating parameters in extreme heating and cooling conditions. The performances of CO2 heat pumps using a flash tank gas injection (FTGI) in the heating mode and FTGI with the suction line heat exchanger (FTSX) in the cooling mode are measured with the variations of the injection ratio, compressor frequency, and evaporating pressure in the extreme outdoor conditions. At the compressor frequency of 45 Hz, the cooling COP of the gas injection CO2 heat pump with the optimum injection ratio is 6.8% higher than that of the non-injection CO2 heat pump at the indoor/outdoor temperatures of 17/43 °C. Moreover, the heating COP of the gas injection CO2 heat pump is 7.1% higher than that of the non-injection system at the indoor/outdoor temperatures of 20/–15 °C.

Suggested Citation

  • Chung, Hyun Joon & Baek, Changhyun & Kang, Hoon & Kim, Dongwoo & Kim, Yongchan, 2018. "Performance evaluation of a gas injection CO2 heat pump according to operating parameters in extreme heating and cooling conditions," Energy, Elsevier, vol. 154(C), pages 337-345.
    • Handle: RePEc:eee:energy:v:154:y:2018:i:c:p:337-345
    DOI: 10.1016/j.energy.2018.04.132
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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. Aprea, Ciro & Maiorino, Angelo, 2009. "Heat rejection pressure optimization for a carbon dioxide split system: An experimental study," Applied Energy, Elsevier, vol. 86(11), pages 2373-2380, November.
    3. Tao, Y.B. & He, Y.L. & Tao, W.Q., 2010. "Exergetic analysis of transcritical CO2 residential air-conditioning system based on experimental data," Applied Energy, Elsevier, vol. 87(10), pages 3065-3072, October.
    4. Yokoyama, Ryohei & Shimizu, Takeshi & Ito, Koichi & Takemura, Kazuhisa, 2007. "Influence of ambient temperatures on performance of a CO2 heat pump water heating system," Energy, Elsevier, vol. 32(4), pages 388-398.
    5. 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.
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