Heat-Transfer Performance of Gas-Gap Heat Switch for mK Sorption Cooler

Xi Xiaotong; Chen Liubiao; Yang Biao; Zhang Zhijian; Guo Luna; Wu Dongxia

doi:10.12465/issn.0253-4339.20250527002

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Heat-Transfer Performance of Gas-Gap Heat Switch for mK Sorption Cooler

更新时间：2026-02-09

- Heat-Transfer Performance of Gas-Gap Heat Switch for mK Sorption Cooler
- Journal of Refrigeration Pages: 1-7(2026)
- 作者机构：
  
  1.天津商业大学天津市制冷技术重点实验室天津 300134
  2. 中国科学院理化技术研究所低温工程学重点实验室北京 100190
  3. 中国科学院大学北京 100049
- 作者简介：
- 基金信息：
  
  the China Postdoctoral Science Foundation(2024M753312)
- DOI：10.12465/issn.0253-4339.20250527002
  CLC：
- CSTR：XXXXX.XX.XXX.20250527002
- Received：27 May 2025，
  
  Revised：2025-06-17，
  
  Accepted：16 July 2025，
  
  Online First：09 February 2026，
- 稿件说明：
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席肖桐,陈六彪,杨彪等.用于mK吸附制冷机的气隙式热开关的传热性能研究[J].制冷学报,

Xi Xiaotong,Chen Liubiao,Yang Biao,et al.Heat-Transfer Performance of Gas-Gap Heat Switch for mK Sorption Cooler[J].Journal of Refrigeration,
席肖桐,陈六彪,杨彪等.用于mK吸附制冷机的气隙式热开关的传热性能研究[J].制冷学报, DOI：10.12465/issn.0253-4339.20250527002. CSTR： XXXXX.XX.XXX.20250527002.

Xi Xiaotong,Chen Liubiao,Yang Biao,et al.Heat-Transfer Performance of Gas-Gap Heat Switch for mK Sorption Cooler[J].Journal of Refrigeration, DOI：10.12465/issn.0253-4339.20250527002. CSTR： XXXXX.XX.XXX.20250527002.

摘要

高性能气隙式热开关的开发对提高mK吸附制冷机的制冷性能至关重要。本文通过理论计算，分析了结构尺寸以及冷、热端温度对气隙式热开关传热性能的影响，并开展了相关实验研究。结果表明：气隙式热开关导通状态的传热性能主要取决于间隙内的气体导热，减小间隙尺寸可提高气体导热温度梯度，当间隙尺寸减小至0.1 mm时，工作在4~10 K范围内的热开关的导通热阻降至15 K/W，理论开关比高达1 100；热开关的隔热性能主要受支撑管的热导率及壁厚尺寸影响，其中壁厚的影响最为显著；提高工作温度，热开关的导热性能增强，隔热性能变差。基于计算结果，最终开发出开关比为822的气隙式热开关。

Abstract

The development of high-performance gas-gap heat switches is crucial for improving the refrigeration performance of mK sorption coolers. The effects of structural dimensions as well as cold- and hot-end temperatures on the heat-transfer performance of gas-gap heat switches were calculated and analyzed in this study， and relevant experimental studies were conducted. The results show that the heat-transfer performance of the gas-gap heat switch in the ON state primarily depends on the thermal conductivity of the gas in the gap， reducing the gap size can improve the temperature gradient of the gas in the gap， and the thermal resistance of the heat switch operating in the 4-10 K range is reduced to 15 K/W. Additionally， the theoretical switching ratio can reach 1 100 when the gap size is reduced to 0.1 mm. The thermal insulation performance is primarily affected by the thermal conductivity and wall thickness of the support tube， with the wall thickness exerting the most significant effect. Additionally， increasing the operating temperature can enhance the thermal conductivity of the heat switch but deteriorates its thermal-insulation performance. Based on these findings， a gas-gap heat switch with a switching ratio of 822 is developed.

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references

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