Accession Number : AD0774892

Title :   Refrigeration of Superconducting Rotating Machinery.

Descriptive Note : Interm rept. 14 Apr 72-30 Jun 73,

Corporate Author : NATIONAL BUREAU OF STANDARDS BOULDER COLO CRYOGENICS DIV

Personal Author(s) : Arp,Vincent D.

Report Date : JUN 1973

Pagination or Media Count : 76

Abstract : 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)

Descriptors :   *Refrigeration systems, Cryogenics, Liquid helium, Equations of state, Equations, Flow, Superconductors, Machines, Hydrodynamics

Subject Categories : Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE