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The Influence of Internal Heat Exchanger on the Performance of Transcritical CO 2 Water Source Heat Pump Water Heater

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  • Fan Feng

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ze Zhang

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Xiufang Liu

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Changhai Liu

    (School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China)

  • Yu Hou

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

The characteristics of the transcritical CO 2 heat pump water heater (HPWH) system are; a lower inlet hot water temperature (T i-hw ) (sometimes this is lower than the water source temperature), and an outlet gas cooler temperature (T o-gc ) which is affected by the T i-hw and often lower than the critical temperature. In order to study the effects of the internal heat exchanger (IHX) on the operational performance of the transcritical CO 2 HPWH when T o-gc is low, a transcritical CO 2 water source HPWH experiment platform is established to conduct experimental research and comparative analysis on the operational performance of the transcritical CO 2 water source HPWH, with or without IHX. It is found that, if only the coefficient of performance (COP) and heating at the optimal exhaust pressure of the transcritical CO 2 water source HPWH were considered, COP and the heating of the non-IHX system would be slightly higher than those of the IHX system at the lower hot water flow and water source temperature, and this increase was not obvious. At the higher hot water flow rate and water source temperature, COP and the heating of the non-IHX system were also higher than those of the IHX system, and the increase was obvious. The experiment results showed that, near the optimal exhaust pressure, the variation range of COP and heating of the IHX system is relatively small, and the system has a relatively high stability.

Suggested Citation

  • Fan Feng & Ze Zhang & Xiufang Liu & Changhai Liu & Yu Hou, 2020. "The Influence of Internal Heat Exchanger on the Performance of Transcritical CO 2 Water Source Heat Pump Water Heater," Energies, MDPI, vol. 13(7), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1787-:d:342634
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    References listed on IDEAS

    as
    1. Xiufang Liu & Changhai Liu & Ze Zhang & Liang Chen & Yu Hou, 2017. "Experimental Study on the Performance of Water Source Trans-Critical CO 2 Heat Pump Water Heater," Energies, MDPI, vol. 10(6), pages 1-14, June.
    2. Yang, Jun Lan & Ma, Yi Tai & Li, Min Xia & Guan, Hai Qing, 2005. "Exergy analysis of transcritical carbon dioxide refrigeration cycle with an expander," Energy, Elsevier, vol. 30(7), pages 1162-1175.
    3. Ma, Yitai & Liu, Zhongyan & Tian, Hua, 2013. "A review of transcritical carbon dioxide heat pump and refrigeration cycles," Energy, Elsevier, vol. 55(C), pages 156-172.
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    Cited by:

    1. Benlin Shi & Muqing Chen & Weikai Chi & Qichao Yang & Guangbin Liu & Yuanyang Zhao & Liansheng Li, 2022. "Effects of Internal Heat Exchanger on Two-Stage Compression Trans-Critical CO 2 Refrigeration Cycle Combined with Expander and Intercooling," Energies, MDPI, vol. 16(1), pages 1-16, December.
    2. Adamson, Keri-Marie & Walmsley, Timothy Gordon & Carson, James K. & Chen, Qun & Schlosser, Florian & Kong, Lana & Cleland, Donald John, 2022. "High-temperature and transcritical heat pump cycles and advancements: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).
    3. Haruhiko Yamasaki & Hiroyuki Wakimoto & Takeshi Kamimura & Kazuhiro Hattori & Petter Nekså & Hiroshi Yamaguchi, 2022. "Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator," Energies, MDPI, vol. 15(11), pages 1-17, June.

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