Refrigeration – Low pressure cold trap process and apparatus
Patent
1985-05-13
1986-12-02
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
55269, 62268, 62513, 16510432, B01D 800
Patent
active
046255214
ABSTRACT:
Apparatus for providing a simulated space environment for the testing of articles under low temperature conditions comprising a liquid nitrogen head tank, liquid nitrogen subcooler pumps, a liquid nitrogen subcooler coil, a liquid nitrogen head tank makeup pumps, a low pressure liquid nitrogen storage tank, a high pressure liquid nitrogen storage tank, a liquid nitrogen transfer pump, a vacuum chamber and thermal simulation heat exchanger shrouds contained within the vacuum chamber. Appropriate internal and external piping connects these components so that the apparatus can be operated both in a subcooled pressurized closed loop system as well as in a gravity convection system. While liquid nitrogen in this apparatus will produce a stable uniform temperature of -297.degree. F. within the shroud containing the article to be tested, other liquids with similar low temperature characteristics may be used. A requirement for such liquids when used as a circulating medium with the apparatus herein is that the boiling point thereof at one atmosphere will produce the required test operating temperature.
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Murphy John C.
Swinderman Robert H.
Capossela Ronald C.
Pittsburgh-Des Moines Corporation
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