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Modeling, development, and experimental validation of a Joule-Thompson superfluid refrigerator using a pulse tube cryocooler.

Author(s) : JAHROMI A. E., MILLER F. K.

Type of article: Article

Summary

An economical method of refrigeration to temperatures near 1 K is introduced in this work. Unlike traditional methods, our refrigeration system does not rely on the use of a helium bath; helium enters a Dewar at room temperature and pre-cools, condenses, and sub-cools to temperatures slightly lower than the normal boiling point of helium during its heat exchange with various components that are connected to a Cryomech pulse tube cryocooler (PT-410). A fixed Joule–Thompson restriction valve is used to create a large pressure difference between the incoming high-pressure helium line and the vacuum pumped space of the 1 K pot causing the helium temperature to drop to its corresponding saturation condition in the pot upon an isenthalpic expansion across the valve. This is a comprehensive report on the performance of a Joule-Thompson superfluid refrigerator; we will discuss our model, techniques in the experimental setup, and present our data for this type refrigerator. This refrigerator reached an ultimate low temperature of 1.39 K with no applied heat load and provided 150 mW of cooling power at 1.65 K.

Details

  • Original title: Modeling, development, and experimental validation of a Joule-Thompson superfluid refrigerator using a pulse tube cryocooler.
  • Record ID : 30012122
  • Languages: English
  • Source: Cryogenics - vol. 61
  • Publication date: 2014/05
  • DOI: http://dx.doi.org/10.1016/j.cryogenics.2014.02.001

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