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Three typical operating states of an R744 two-phase thermosyphon loop

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  • Tong, Zhen
  • Liu, Xiao-Hua
  • Jiang, Yi

Abstract

As the two-phase thermosyphon loop (TPTL) gets more extensive application in data centers, problems have been encountered. One of the most common problems is undesirable overheating or subcooling during the operation of the TPTL. The overheating or subcooling results from abnormal operating states. Herein, an experiment conducted on an R744-based TPTL is described. The TPTL experienced a prestart operating state, an oscillatory operating state, and a stable operating state successively as the heat transfer quantity increased. In the prestart operating state, no regular circulation was formed in the loop, and overheating was usually measured in the top part of the riser. In the oscillatory operating state, the mass flow rate, temperature, and pressure all exhibited periodical variation with an identical period. In the stable operating state, the TPTL functioned well until the heat transfer quantity exceeded the maximum heat transfer ability of the TPTL. The stable operating state was divided into the normal operating state and the overload operating state, and the normal operating state is the goal to strive for in practical application. In the experiment, at the same fill ratio of 100%, the reasonable heat load ranges for normal operating of the TPTL were 650–1400W, 1400–3300W, and 2000–5400W for diameters of 6, 9, and 12mm, respectively. Higher heat load demanded for larger diameter.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:appene:v:206:y:2017:i:c:p:181-192
    DOI: 10.1016/j.apenergy.2017.08.134
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    References listed on IDEAS

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    1. 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.
    2. 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.
    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. 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.
    5. He, Wei & Hong, Xiaoqiang & Zhao, Xudong & Zhang, Xingxing & Shen, Jinchun & Ji, Jie, 2015. "Operational performance of a novel heat pump assisted solar façade loop-heat-pipe water heating system," Applied Energy, Elsevier, vol. 146(C), pages 371-382.
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    2. Cao, Jingyu & Zheng, Zhanying & Asim, Muhammad & Hu, Mingke & Wang, Qiliang & Su, Yuehong & Pei, Gang & Leung, Michael K.H., 2020. "A review on independent and integrated/coupled two-phase loop thermosyphons," Applied Energy, Elsevier, vol. 280(C).
    3. Zhongchao Zhao & Yong Zhang & Yanrui Zhang & Yimeng Zhou & Hao Hu, 2018. "Numerical Study on the Transient Thermal Performance of a Two-Phase Closed Thermosyphon," Energies, MDPI, vol. 11(6), pages 1-15, June.
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