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Helium liquefaction with a commercial 4 K Gifford-McMahon cryocooler.

Author(s) : SCHMIDT-WELLENBURG P., ZIMMER O.

Type of article: Article

Summary

This paper describes helium liquefaction using a commercial cryocooler with 1.5 W cooling power at 4.2 K (Sumitomo model RDK415D with compressor CSW-71D, consuming 6.5 kW electrical power), equipped with heat exchangers for precooling the incoming gas. No additional cooling power of cryoliquids or additional Joule-Thomson stages were utilized. Measurements of the pressure dependence of the liquefaction rate were performed. A maximum value of 83.9 g/h was obtained for 2.25 bar stabilized input pressure. Including the time needed to cool the liquefied helium to 4.2 K at 1 bar after filling the bottle connected to the cold head, and correcting for heat screen influences, this results in a net liquefaction rate of 67.7 g/h. Maintaining a pressure close to 1 bar above the bath during liquefaction, a rate of 55.7 g/h was obtained. The simple design enables many applications of the apparatus. [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Helium liquefaction with a commercial 4 K Gifford-McMahon cryocooler.
  • Record ID : 2007-0933
  • Languages: English
  • Source: Cryogenics - vol. 46 - n. 11
  • Publication date: 2006/11

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