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Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

Author

Listed:
  • Chenxiao Zheng

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Shijun You

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Huan Zhang

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Zeqin Liu

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

  • Wandong Zheng

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Zhenjing Wu

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Man Fan

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

Abstract

Traditional defrosting methods applied to solve frosting problems of air-source heat pumps operating in cold periods may reduce heat capacity of the system and decrease indoor thermal comfort. In order to improve the performance of air-source heat pump (ASHP) and maintain indoor temperature in defrosting conditions, an air-source heat pump combined with a refrigerant direct-condensation radiant floor heating system with phase change material is proposed and evaluated in this study. Two radiant floor heating terminals with and without composite phase change material modules were compared through experiments. A composite phase change material based on dodecanoic acid-tetradecanol-hexadecanol mixture and expanded graphite was investigated for this application. Experimental results indicate that both heat fluxes of two comparing terminals are higher than 70 W/m 2 in heating condition. At the same time, the floor surface temperature, indoor air temperature, and heating capacity of the terminal with composite phase change material modules are higher than those without composite phase change material modules in defrosting condition. This suggests that the proposed system with composite phase change material modules can improve indoor thermal comfort in defrosting condition as well as satisfy the heating requirement in heating condition.

Suggested Citation

  • Chenxiao Zheng & Shijun You & Huan Zhang & Zeqin Liu & Wandong Zheng & Zhenjing Wu & Man Fan, 2020. "Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material," Energies, MDPI, vol. 13(18), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4594-:d:408715
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    References listed on IDEAS

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    Cited by:

    1. Łukasz Amanowicz, 2020. "Controlling the Thermal Power of a Wall Heating Panel with Heat Pipes by Changing the Mass Flowrate and Temperature of Supplying Water—Experimental Investigations," Energies, MDPI, vol. 13(24), pages 1-18, December.
    2. Fei Wang & Rijing Zhao & Wenming Xu & Dong Huang & Zhiguo Qu, 2021. "A Heater-Assisted Air Source Heat Pump Air Conditioner to Improve Thermal Comfort with Frost-Retarded Heating and Heat-Uninterrupted Defrosting," Energies, MDPI, vol. 14(9), pages 1-13, May.

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