Refrigeration trailer
First Claim
1. A kit for installation in a cryogenic refrigeration system wherein liquid CO2 in an evapoarator absorbs a quantity of heat exceeding the latent heat of vaporization of the CO2 to cool air adjacent the evaporator, the kit comprising:
- (a) heat exchanger means;
(b) means to connect said heat exchanger means to receive CO2 from the evaporator; and
(c) means to connect said heat exchanger means to a secondary evaporator such that CO2 vapor flowing from said heat exchanger means expands to provide cold CO2 vapor for circulation through the secondary evaporator, said heat exchanger means delivering a quantity of heat to CO2 received from the evaporator to prevent solidification of the CO2 when depressurized to permit it to expand for circulation through the secondary vaporizer.
1 Assignment
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Accused Products
Abstract
A method and apparatus to refrigerate air in a compartment wherein liquid CO2 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 CO2 vapor expands through the motors. CO2 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.
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Citations
12 Claims
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1. A kit for installation in a cryogenic refrigeration system wherein liquid CO2 in an evapoarator absorbs a quantity of heat exceeding the latent heat of vaporization of the CO2 to cool air adjacent the evaporator, the kit comprising:
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(a) heat exchanger means; (b) means to connect said heat exchanger means to receive CO2 from the evaporator; and (c) means to connect said heat exchanger means to a secondary evaporator such that CO2 vapor flowing from said heat exchanger means expands to provide cold CO2 vapor for circulation through the secondary evaporator, said heat exchanger means delivering a quantity of heat to CO2 received from the evaporator to prevent solidification of the CO2 when depressurized to permit it to expand for circulation through the secondary vaporizer.
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2. Apparatus to control temperature in a compartment comprising:
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(a) a source of liquefied carbon dioxide; (b) a primary evaporator and a secondary evaporator; (c) first conduit means connecting the primary evaporator and the source of liquid carbon dioxide; (d) enthalpy control means; (e) second conduit means connecting the enthalpy control means with said primary evaporator; (f) a fan driven by a motor connected to said enthalpy control means, said fan being arranged to cause air in the compartment to circulate in heat exchange relation with surfaces of said primary and said secondary evaporators, said enthalpy control means being adapted to permit isentropic expansion of CO2 through said motor while preventing solidification of carbon dioxide as it depressurizes in said motor; and (g) means delivering CO2 from said motor through said secondary evaporator to utilize the cooling capacity of the expanding CO2 to extract heat from air adjacent said secondary evaporator.
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3. A refrigerated cargo vehicle comprising:
- a pair of side walls;
a front wall extending between said side walls;
a floor;
a top wall, said floor and top wall joining said side walls and said front wall to form a cargo compartment;
wheels outside of said cargo compartment below said floor;
a source of liquefied carbon dioxide;
means securing said source of carbon dioxide below said floor;
evaporator means in said cargo compartment in heat exchange relation with air in said compartment, said evaporator means having an inlet and an outlet;
means connecting said inlet of said evaporator means and said source of liquid carbon dioxide;
heat exchanger means;
means connecting said heat exchanger means with said outlet of said evaporator means;
a pneumatically operated motor having inlet and exhaust ports;
fan means in said compartment driven by said motor, said fan means being arranged to cause air in said compartment to circulate over surfaces of said evaporator means, said heat exchanger means delivering carbon dioxide vapor from said evaporator means to said inlet port of said motor in a temperature range to prevent solidification of carbon dioxide depressurized in said motor enroute to said exhaust port. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
- a pair of side walls;
Specification