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Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique

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  • Byrne, Paul
  • Miriel, Jacques
  • Lenat, Yves

Abstract

This article presents the concepts of an air-source heat pump for simultaneous heating and cooling (HPS) designed for hotels and smaller residential, commercial and office buildings in which simultaneous needs in heating and cooling are frequent. The main advantage of the HPS is to carry out simultaneously space heating and space cooling with the same energy input. Ambient air is used as a balancing source to run a heating or a cooling mode. The second advantage is that, during winter, energy recovered by the subcooling of the refrigerant is stored at first in a water tank and used subsequently as a cold source at the water evaporator to improve the average performance and to carry out defrosting of the air evaporator using a two-phase thermosiphon. Unlike conventional air-source heat pumps, defrosting is carried out without stopping the heat production. A R407C HPS prototype was built and tested. The basic concepts of the HPS are detailed in part1 of this article [1]. Its performance on defined operating conditions corresponds to the data given by the selection software of the compressor manufacturer. In the present part of this article, the operation of the high pressure control system, the transitions between heating, cooling and simultaneous modes and the defrosting sequence are analysed and validated experimentally.

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  • Byrne, Paul & Miriel, Jacques & Lenat, Yves, 2011. "Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique," Applied Energy, Elsevier, vol. 88(9), pages 3072-3078.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:9:p:3072-3078
    DOI: 10.1016/j.apenergy.2011.03.002
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    1. Shao, Liang-Liang & Yang, Liang & Zhang, Chun-Lu, 2010. "Comparison of heat pump performance using fin-and-tube and microchannel heat exchangers under frost conditions," Applied Energy, Elsevier, vol. 87(4), pages 1187-1197, April.
    2. Liu, Di & Zhao, Fu-Yun & Tang, Guang-Fa, 2007. "Frosting of heat pump with heat recovery facility," Renewable Energy, Elsevier, vol. 32(7), pages 1228-1242.
    3. Byrne, Paul & Miriel, Jacques & Lenat, Yves, 2011. "Experimental study of an air-source heat pump for simultaneous heating and cooling - Part 1: Basic concepts and performance verification," Applied Energy, Elsevier, vol. 88(5), pages 1841-1847, May.
    4. Huang, Dong & Li, Quanxu & Yuan, Xiuling, 2009. "Comparison between hot-gas bypass defrosting and reverse-cycle defrosting methods on an air-to-water heat pump," Applied Energy, Elsevier, vol. 86(9), pages 1697-1703, September.
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    Cited by:

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    4. Wang, Fenghao & Wang, Zhihua & Zheng, Yuxin & Lin, Zhang & Hao, Pengfei & Huan, Chao & Wang, Tian, 2015. "Performance investigation of a novel frost-free air-source heat pump water heater combined with energy storage and dehumidification," Applied Energy, Elsevier, vol. 139(C), pages 212-219.
    5. Paul Byrne, 2022. "Research Summary and Literature Review on Modelling and Simulation of Heat Pumps for Simultaneous Heating and Cooling for Buildings," Energies, MDPI, vol. 15(10), pages 1-43, May.
    6. Kim, Min-Hwan & Lee, Kwan-Soo, 2015. "Determination method of defrosting start-time based on temperature measurements," Applied Energy, Elsevier, vol. 146(C), pages 263-269.
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    8. Dae-Uk Shin & Chang-Ho Jeong, 2021. "Energy Savings of Simultaneous Heating and Cooling System According to Indoor Set Temperature Changes in the Comfort Range," Energies, MDPI, vol. 14(22), pages 1-19, November.
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    10. Long, Zhang & Jiankai, Dong & Yiqiang, Jiang & Yang, Yao, 2014. "A novel defrosting method using heat energy dissipated by the compressor of an air source heat pump," Applied Energy, Elsevier, vol. 133(C), pages 101-111.
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    15. Moo-Yeon Lee & Yongchan Kim & Dong-Yeon Lee, 2012. "Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps," Energies, MDPI, vol. 5(9), pages 1-13, September.

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