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Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions

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  • Baek, Changhyun
  • Heo, Jaehyeok
  • Jung, Jongho
  • Cho, Honghyun
  • Kim, Yongchan

Abstract

The objective of this study is to investigate the performance characteristics of an injection CO2 (carbon dioxide) HPWH (heat pump water heater) at various operating conditions. In the standard and standby heat loss test conditions, the performance of a two-stage CO2 HPWH adopting a SCVI (sub-cooler vapor injection HPWH) cycle was measured and analyzed by varying the compressor frequency, the water flow rate, and the injection ratio at various outdoor temperatures. In the standard tests at the outdoor temperature of −15 °C, the COP (coefficient of performance) of the optimized SCVI HPWH was 7.6% higher than that of the non-injection HPWH. During the standby loss tests at the water flow rate of 200 kg h−1, the COP of the optimized SCVI HPWH was 7.1% higher than that of the non-injection HPWH.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:77:y:2014:i:c:p:570-578
    DOI: 10.1016/j.energy.2014.09.038
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    References listed on IDEAS

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    1. Guo, J.J. & Wu, J.Y. & Wang, R.Z. & Li, S., 2011. "Experimental research and operation optimization of an air-source heat pump water heater," Applied Energy, Elsevier, vol. 88(11), pages 4128-4138.
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    Cited by:

    1. 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).
    2. Ge, T.S. & Weng, Z.C. & Huang, R. & Hu, B. & Eikevik, Trygve Magne & Dai, Y.J., 2023. "High temperature transcritical CO2 heat pump with optimized tube-in-tube heat exchanger," Energy, Elsevier, vol. 283(C).
    3. 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).
    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. Jia, Jie & Lee, W.L., 2015. "Experimental study of the application of intermittently operated SEHRAC (storage-enhanced heat recovery room air-conditioner) in residential buildings in Hong Kong," Energy, Elsevier, vol. 83(C), pages 628-637.
    6. Yulong Song & Haidan Wang & Feng Cao, 2020. "Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO 2 System with a Dedicated Transcritical CO 2 Subcooler," Energies, MDPI, vol. 13(2), pages 1-23, January.
    7. Zeng, Min-Qiang & Zheng, Qiu-Yun & Zhang, Xue-Lai & Mo, Fan-Yang & Zhang, Xin-Rong, 2022. "Thermodynamic analysis of a novel multi-target temperature transcritical CO2 ejector-expansion refrigeration cycle with vapor-injection," Energy, Elsevier, vol. 259(C).
    8. 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.
    9. 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.

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