Refrigeration – Low pressure cold trap process and apparatus
Patent
1976-11-01
1978-07-18
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
62165, 62332, 62514R, F17C 702
Patent
active
041007590
ABSTRACT:
A system for filling vehicle tanks with low pressure liquid carbon dioxide. A holding chamber is supplied with high pressure liquid CO.sub.2 from a storage vessel system, and the pressure of liquid CO.sub.2 is reduced to about 60 psig or below to create CO.sub.2 vapor and CO.sub.2 snow and form a low-temperature coolant reservoir in the holding chamber. CO.sub.2 vapor from the chamber is compressed and returned to the storage vessel system. Liquid CO.sub.2 from the storage vessel system can be supplied simultaneously to several vehicle tanks at below about 125 psig, and vapor created as a result thereof is condensed by melting CO.sub.2 snow in the holding chamber. Standby cooling of vehicle compartments is provided by vaporizing liquid CO.sub.2 from a vehicle tank in a heat exchanger for vaporization therein, expanding the vapor to cool it and then passing the expanded vapor through a second heat exchanger. An auxiliary compressor withdraws the expanded vapor from the second heat exchanger and compresses withdrawn vapor sufficient to inject it into the holding chamber where it is condensed by melting the snow.
REFERENCES:
patent: 3754407 (1973-08-01), Tyree, Jr.
patent: 3802212 (1974-04-01), Martin et al.
patent: 3810365 (1974-05-01), Hampton et al.
patent: 3984993 (1976-10-01), Muska
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