Abstract
The authors are now developing a helium liquefier of l00 1/h liquefaction capacity for use with a 70 MW superconducting generator. This paper describes liquefaction characteristics of a helium liquefier using various types of Claude cycle with multitude expanders arranged in parallel. The calculation method for liquefaction characteristics was established and the liquefaction capacity and FOM based on the actual screw compressor performance were calculated and shown in figures with several expansion methods for liquefaction combined with various precooling procedures. From these results, the optimized conditions for various Claude cycles were clarified for the best FOM and the greatest liquefaction capacity.
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