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Experimental research on heat transfer performance of CO_2 low temperature heat pipe

机译：CO_2低温热管传热性能的实验研究

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摘要

With the development of applications in the sub-zero temperature region, the high performance heat transfer element, heat pipe is expected to play an important role in this field. However, suitable working fluid for low temperature heat pipe is limited, the two commonly used substances, Freon and ammonia are environmentally harmful. In contrast, carbon dioxide (CO_2) is an environmentally friendly gas and can be a promising candidate working fluid for low temperature heat pipe because of its suitable thermal properties. At present, CO_2 heat pipes are seldom investigated and used in the sub-zero temperature region. So, the heat transfer performance of CO_2 heat pipe is experimentally investigated, and influences of heat loads, filling ratios, condenser conditions (temperature, length, and position) are investigated. The results show that the performance of CO_2 heat pipe is satisfactory, its thermal resistance can be 0.2-0.4K/W and its equivalent thermal conductivity can be 3.7 × 10~4 W/(m·K). Besides, the performance of R134a heat pipe is investigated as a control group, it is found that its thermal resistance is 2-5 times that of CO_2 heat pipe in sub-zero temperature region. The results illustrate that the CO_2 heat pipe has a good application prospect in the field of low temperature range from -50 °C to 0 °C.
机译：随着在零温度区域的应用中的应用，高性能传热元件，热管预计在该领域发挥着重要作用。然而，用于低温热管的合适工作流体是有限的，这两个常用的物质，氟利昂和氨是环保的。相反，二氧化碳（CO_2）是一种环保气体，并且由于其合适的热性能，可以是低温热管的有希望的候选工作流体。目前，CO_2热管很少研究并在零温度区域中使用。因此，研究了CO_2热管的传热性能，实验研究，并研究了热载荷，灌装比，冷凝器条件（温度，长度和位置）的影响。结果表明，CO_2热管的性能令人满意，其热阻可为0.2-0.4k / w，其等效导热率可为3.7×10〜4 w /（m·k）。此外，研究R134A热管的性能作为对照组，发现其热阻是亚零温度区域中的CO_2热管的2-5倍。结果说明了CO_2热管在低温范围内的良好应用前景从-50℃至0℃。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|120987.1-120987.14|共14页
  • 作者

    Huanguang Wang; Yunhao Bao; Shuai Zhu; Meng Liu; Zhonghao Rao;

  • 作者单位

    School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 China;

    School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 China;

    School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 China;

    School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 China;

    School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heat pipe; Thermal resistance; Carbon dioxide; Low temperature;

    机译：热管;热阻;二氧化碳;低温;

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