Refrigeration – Storage of solidified or liquified gas – Including cryostat
Patent
1989-10-27
1991-08-20
Capossela, Ronald C.
Refrigeration
Storage of solidified or liquified gas
Including cryostat
62 31, 62467, 505891, F25B 1900
Patent
active
050403737
ABSTRACT:
A cryogenic condensing system is provided wherein the working fluid is paramagnetic and entropy reduction is accomplished by means of a magnetic field. Condensation is obtained by isentropically expanding partially compressed vapor into a thermally insulated vacuum chamber with a sufficiently large expansion ratio to supersaturate the vapor, a portion of which condenses spontaneously. That portion of the vapor which does not condense is drawn out of the condensing chamber and into the bore of a superconducting solenoid by magnetic attractive forces thereby maintaining the vacuum environment inside the chamber. The noncondensed vapor is magnetized and magnetically compressed inside the solenoid thereby reducing its entropy. Heat of magnetization is extracted by a non-magnetic turbine which converts the kinetic energy of the gas stream pulled into the solenoid into mechanical work. The low entropy vapor is removed from the solenoid by a compressor mounted inside the bore such that its thermodynamic state is returned to the preexpanded state outside the magnetic field. This vapor is mixed with previously condensed vapor having the same thermodynamic state and recycled back through the condensing expander to produce a constant flow of condensed working fluid. The system could be used for cryogenic engines using oxygen.
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