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Liquid helium - Siemens-cycle only?

  1. Nov 27, 2014 #1
    Why can't I reach 4K with the Siemens-cycle?
     
  2. jcsd
  3. Nov 28, 2014 #2

    Astronuc

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    http://kryolab.fysik.lu.se/dokument/e_techn.html

    It appears that He liquification systems use the Siemens cycle upfront in the high temperature range, and the last stage is Hampson-Linde cycle.

    It would be worthwhile to find the original patents - Siemens cooling cycle (patented by W. Siemens 1857) and the Hampson-Linde Patent.
     
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