Analysis and test of 4He gas-gap heat switch for a sub-Kelvin sorption cooler

Yilin Lei, Guotong Hong*, Ya nan Zhao, Ruixin Li, Jia Quan, Jingtao Liang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Gas-gap heat switches (GGHSs) are significant components in sub-Kelvin sorption coolers (SKSCs). To develop an effective GGHS for SKSCs, a complete GGHS theoretical model is proposed by integrating the adsorption characteristics of activated carbon and the principle of GGHSs. This model establishes a relationship between the temperature of activated carbon and the corresponding thermal conductance of GGHSs. Based on this model, a 4He GGHS was designed, which consists of two cylindrical copper blocks separated by a 0.2 mm gas gap and a surface area of 9.896 cm2. The device was charged with 100 kPa of 4He at 297 K. Near the base temperature of the GM cryocooler of 3 K, an ON thermal resistance of 20 K/W and an OFF thermal resistance of 21,650 K/W with 1 mW applied to the hot end were obtained, achieving a switching ratio of 1082.5. The experimental results were analyzed and compared with the theoretical data, and proved to be in good agreement. Finally, the GGHS was integrated with a SKSC, achieving an ultimate temperature of 773 mK.

Original languageEnglish
Article number103687
JournalCryogenics
Volume132
DOIs
Publication statusPublished - Jun 2023

Keywords

  • Activated carbon
  • Gas-gap heat switch
  • Sub-Kelvin sorption cooler
  • Thermal conductance

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