Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Miniature J-T cryocooler using argon and nitrous oxide mixture

  • Published : 2008.11.30
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Abstract

Miniature J-T cryocooler using nitrogen or argon has been widely adopted in cooling infrared sensor for space/military application and cryosurgery. Argon or nitrogen, however, has relatively low specific cooling power compared to nitrous oxide, but the ultimate operating temperature is much lower than nitrous oxide. On the other hand, nitrous oxide has large specific cooling power, but the operating temperature is limited to its boiling point (>183K). To compromise the different characteristics of these gases, the performance of miniature J-T cryocooler using argon and nitrous oxide mixture is investigated in this paper. Three different compositions of mixture (25/75, 50/50, and 75/25 molar fraction) are blended and tested. The results are compared with the experiments of pure argon and pure nitrous oxide. The experimental results show some encouraging potentiality of mixed refrigerant J-T cryocooler. The critical clogging problem, however, was observed with argon and nitrous oxide mixture, and the lowest achievable temperature with this mixture was limited to the freezing point of nitrous oxide. The paper discusses detailed clogging process of the mixture and suggests an alternative.

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References

  1. J. M. Geist, P. K. Lashmet, "Minaiture Joule-Thomson refrigeration systems," Advances in cryogenic engineering, vol. 5, pp. 324-331, 1959
  2. J. S. Buller, "A miniature self-regulating rapid-cooling Joule-Thomson cryostat," Advances in cryogenic engineering, vol. 16, pp. 205-213, 1971
  3. G. Hwang, S. Jeong, S. In, "Design of the miniature Joule-Thomson refrigerator as a cryoprobe," J. of the Korea institute of applied superconductivity and cryogenics, vol. 9, pp. 86-90, 2007
  4. B. Maytal, S. W. Van Sciver, "Characterization of coolants for Joule-Thomson cryocoolers," Proc. of the 6th Int. Cryocoolers, Conference, pp. 245-256, 1990
  5. F. Keppler, G. Nellis, S. Klein, "Optimization of the composition of a gas mixture in a Joule-Thomson cycle," HAVC&R Res, vol. 10(2), pp. 213-230, 2004 https://doi.org/10.1080/10789669.2004.10391100
  6. G. Hwang, S. Jeong, "Miniature J-T refrigerator using triplet heat exchanger," Proceedings of ICEC22-ICMC2008, submitted for publication
  7. R. F. Barron, Cryogenic systems, 2nd ed., Oxford: New York, pp. 64-68, 1985
  8. B. Maytal, G. F. Nellis, S. A. Klein, J. M. Pfotenhauer, "Elevated-pressure mixed-coolants Joule-Thomson cryocooling," Cryogenics, vol. 46, pp. 55-67, 2006 https://doi.org/10.1016/j.cryogenics.2005.11.005