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Heat transfer rate characteristics of two-phase closed thermosyphon heat exchanger

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  • Song, Wei
  • Zheng, Changjin
  • Yang, Jiaming

Abstract

Two-phase closed thermosyphon heat exchangers (TPCTs) have considerable potential for use in ground source heat pump systems. This paper proposes a new metal-polyethylene TPCT that uses water as the working fluid and is composed of a galvanized steel pipe and a polyethylene pipe. The heat transfer rate characteristics of the metal-polyethylene TPCT were studied using a constant-temperature water bath test bench. The experimental results show that the metal-polyethylene TPCT has the best heat transfer rate when the vacuum degree and filling ratio are 1.00 kPa and 12.5%, respectively. The average heat transfer rate increased as the temperature of the heat source and the flow rate of the cooling water increased. Finally, a sandbox test bench was built, which provided seepage and non-seepage experimental conditions for the metal-polyethylene TPCT. In the sandbox experiment, the heat transfer rate capacity of the metal-polyethylene TPCT was initially studied and compared with that of a single U-tube heat exchanger, and the heat transfer rates were similar. When the evaporation section length was 0.5 m, the heat transfer rates were 34.89 W/m and 111.75 W/m under non-seepage and seepage conditions, respectively. The experimental results show that the metal-polyethylene TPCT is feasible as a new type of ground heat exchanger.

Suggested Citation

  • Song, Wei & Zheng, Changjin & Yang, Jiaming, 2021. "Heat transfer rate characteristics of two-phase closed thermosyphon heat exchanger," Renewable Energy, Elsevier, vol. 177(C), pages 397-410.
    • Handle: RePEc:eee:renene:v:177:y:2021:i:c:p:397-410
    DOI: 10.1016/j.renene.2021.05.147
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    References listed on IDEAS

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    1. Ma, Limin & Shang, Linlin & Zhong, Dan & Ji, Zhongli, 2017. "Experimental investigation of a two-phase closed thermosyphon charged with hydrocarbon and Freon refrigerants," Applied Energy, Elsevier, vol. 207(C), pages 665-673.
    2. Fan, Rui & Jiang, Yiqiang & Yao, Yang & Ma, Zuiliang, 2008. "Theoretical study on the performance of an integrated ground-source heat pump system in a whole year," Energy, Elsevier, vol. 33(11), pages 1671-1679.
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    1. Li, Chenglin & Zhang, Guozhu & Xiao, Suguang & Shi, Yehui & Xu, Chenghua & Sun, Yinjuan, 2023. "Numerical investigation on thermal performance enhancement mechanism of tunnel lining GHEs using two-phase closed thermosyphons for building cooling," Renewable Energy, Elsevier, vol. 212(C), pages 875-886.

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