Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental Investigation on the Cryogenic Thermosiphon Using N$_2$ and CF$_4$ Mixture as the Working Fluid

N$_2$와 CF$_4$ 혼합물을 작동유체로 하는 극저온 열사이펀에 대한 실험적 연구

  • Kim, Young-Kwon (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Ji-Sung (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Jeong, Sang-Kwon (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Han, Young-Hee (Superconductivity and Applications Group, Korea Electric Power Research Institute) ;
  • Jung, Se-Yong (Superconductivity and Applications Group, Korea Electric Power Research Institute) ;
  • Park, Byung-Jun (Superconductivity and Applications Group, Korea Electric Power Research Institute)
  • 김영권 (한국과학기술원 기계공학과) ;
  • 이지성 (한국과학기술원 기계공학과) ;
  • 정상권 (한국과학기술원 기계공학과) ;
  • 한영희 (한전전력연구원 초전도그룹) ;
  • 정세용 (한전전력연구원 초전도그룹) ;
  • 박병준 (한전전력연구원 초전도그룹)
  • Published : 2009.09.10
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Abstract

A thermosiphon is utilized as a thermal shunt to reduce the cool-down time of a cryogenic system cooled by a two stage cryocooler. The cool-down time reduction by the thermosiphon is determined by the type of working fluid which is directly related to the operating temperature range of the thermosiphon. A mixed working fluid has a potential to widen the operation temperature range of the thermosipohon. In this study, the thermosiphon using N$_2$ and CF$_4$ mixture as the working fluid is fabricated and tested to verify its transient heat transfer performance. The thermosiphon with the mixed working fluid has no noticeable reduction of cool-down time compared with that of the thermosiphon with pure working fluid in this experiment. However, it seems that the thermosiphon with mixed working fluid may have an advantage according to the cooling capacity of a cryocooler, the cooling target temperature and the size of a cooling object.

Keywords

References

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