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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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    References listed on IDEAS

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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:

    1. Ahn, Jae Hwan & Kang, Hoon & Lee, Ho Seong & Jung, Hae Won & Baek, Changhyun & Kim, Yongchan, 2014. "Heating performance characteristics of a dual source heat pump using air and waste heat in electric vehicles," Applied Energy, Elsevier, vol. 119(C), pages 1-9.
    2. Siviter, J. & Montecucco, A. & Knox, A.R., 2015. "Rankine cycle efficiency gain using thermoelectric heat pumps," Applied Energy, Elsevier, vol. 140(C), pages 161-170.
    3. Tong, Zhen & Liu, Xiao-Hua & Jiang, Yi, 2017. "Experimental study of the self-regulating performance of an R744 two-phase thermosyphon loop," Applied Energy, Elsevier, vol. 186(P1), pages 1-12.
    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. Jafari, Davoud & Franco, Alessandro & Filippeschi, Sauro & Di Marco, Paolo, 2016. "Two-phase closed thermosyphons: A review of studies and solar applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 575-593.
    7. 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.
    8. Yang, Seung-Hwan & Rhee, Joong Yong, 2013. "Utilization and performance evaluation of a surplus air heat pump system for greenhouse cooling and heating," Applied Energy, Elsevier, vol. 105(C), pages 244-251.
    9. 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.
    10. 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.
    11. Zhang, Penglei & Wang, Baolong & Shi, Wenxing & Li, Xianting, 2015. "Experimental investigation on two-phase thermosyphon loop with partially liquid-filled downcomer," Applied Energy, Elsevier, vol. 160(C), pages 10-17.
    12. 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.
    13. 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.
    14. Lee, Joo Seong & Song, Kang Sub & Ahn, Jae Hwan & Kim, Yongchan, 2015. "Comparison on the transient cooling performances of hybrid ground-source heat pumps with various flow loop configurations," Energy, Elsevier, vol. 82(C), pages 678-685.
    15. Tong, Zhen & Liu, Xiao-Hua & Jiang, Yi, 2017. "Three typical operating states of an R744 two-phase thermosyphon loop," Applied Energy, Elsevier, vol. 206(C), pages 181-192.

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