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US 5,313,787 AGranted
Refrigeration trailer
AssigneeGeneral Cryogenics Incorporated
InventorPatrick S. Martin
Life of this patent
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AssigneeGeneral Cryogenics Incorporated
InventorPatrick S. Martin
Estimating the term…
A method and apparatus to refrigerate air in a compartment wherein liquid CO.sub.2 is delivered through a first primary heat exchanger such that sufficient heat is absorbed to evaporate the liquid carbon dioxide to form pressurized vapor. The pressurized vapor is heated in a gas fired heater to prevent solidification of the pressurized carbon dioxide when it is depressurized to provide isentropic expansion of the vapor through pneumatically driven fan motors into a secondary heat exchanger. Orifices in inlets to the fan motors and solenoid valves in flow lines to the fan motors keep the vapor pressurized while the heater supplies sufficient heat to prevent solidification when the CO.sub.2 vapor expands through the motors. CO.sub.2 vapor is routed from the second heat exchanger to chill surfaces in a dehumidifier to condense moisture from a stream of air before it flows to the heat exchangers.
A control system for a cryogenic refrigeration system in which liquid CO.sub.2, delivered through an evaporator, to a fluid driven motor, absorbs heat to cool a stream of air discharged into the cargo compartment, the evaporator being configured to transfer a quantity of heat to the quantity of CO.sub.2 flowing through the evaporator from air flowing adjacent thereto, comprising:
A control system for a cryogenic refrigeration system in which liquid CO.sub.2, delivered through primary and secondary evaporators, absorbs heat to cool a stream of air discharged into the cargo compartment, the primary evaporator being configured to transfer a quantity of heat sufficient to vaporize the quantity of CO.sub.2 flowing through the primary evaporator from air flowing adjacent thereto, comprising:
Dependencies are inferred from the claim text.