Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1991-07-08
1992-09-01
Capossela, Ronald C.
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
62440, F25B 900
Patent
active
051428725
ABSTRACT:
A laboratory freezer appliance providing a usable storage space on the order of 5 to 20 cubic feet capable of storage temperatures of -160.degree. C. and lower including an insulated freezer chamber, heat transfer tubes in proximity to the freezer chamber carrying liquid argon at ultra-low temperatures which absorbs heat from the freezer chamber thereby vaporizing the argon in the heat transfer tubes; a closed cycle, hermetically-sealed free piston Stirling cycle heat pump providing a cold end above a vertical displacer driven by a linearly reciprocating piston at a delta T to the freezer chamber of about -13.degree. C.; a condensing chamber surrounding the cold end of the heat pump for condensing argon vapor to the argon liquid; and a distributor for distributing liquid argon from the condensing chamber to the heat transfer tubes and returning argon vapor to the condensing chamber, all without mechanical pumping of the argon, in a continuous, closed cycle refrigeration system.
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"Development of a mechanically refrigerated cryogenic preservation system using a mixed refrigerant technique to maintain specimen temperatures of -135.degree. C.," by William B. White et al, Queue Systems (7 pages).
Queue Systems Brochure, "Trust the cold facts" (16 pages).
Capossela Ronald C.
Forma Scientific, Inc.
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