Cryogenic refrigeration for vehicles
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United States of America Patent
Stats
-
Feb 5, 1980
Issued Date -
N/A
app pub date -
Jul 24, 1978
filing date -
Nov 1, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cargo compartment of a refrigerated vehicle is cooled by a cryogen, such as carbon dioxide. A storage tank carried by the vehicle is filled with CO.sub.2 slush. Liquid CO.sub.2 is separated from solid CO.sub.2 and supplied to a heat-exchanger where it is vaporized and the vapor is warmed by heat transfer from the cargo compartment atmosphere. A minimum vapor pressure of at least about 75 psia is maintained in the heat-exchanger, and a portion of the vapor is returned to the vehicle tank, melting solid CO.sub.2 therein. The major portion of the vapor stream is expanded through one or more gas motors, passed through one or more additional heat-exchangers to cool the cargo compartment and then vented. The pressure of the returning vapor is preferably increased by a compressor attached to a gas motor and injected into the vehicle tank.
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