Refrigeration of Superconducting Rotating Machinery.

摘要

Recent work at the NBS Cryogenics Division in three areas related to helium refrigeration is summarized: (1) Analysis is given of a possible high pressure refrigeration cycle which offers in principle a reduced component size,but which turns out to be impractical because of expansion engine inefficiencies. (2) Exact equations for flow of a real fluid are derived and applied to problems of fluid flow near the critical point,as may occur with some helium-cooled superconducting systems,and (3) Three new equations of state for helium are given,each using different state variables,to eliminate the need for iterative techniques in helium refrigeration cycle and fluid flow analysis. (Author)