Refrigeration trailer
First Claim
1. A control system for a cryogenic refrigeration system in which liquid CO2, 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 CO2 flowing through the evaporator from air flowing adjacent thereto, comprising:
- (a) flow control means between the evaporator and the fluid driven motor;
(b) temperature sensing means generating a signal indicating the temperature of CO2 delivered to the fluid driven motor; and
(c) a heater between the evaporator and the fluid driven motor and associated with said flow control means and said temperature sensing means, said heater maintaining entropy of CO2 flowing to said fluid driven motor to permit isentropic expansion of the CO2 through the motor while preventing transformation of the CO2 to a solid state.
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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.
72 Citations
11 Claims
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1. A control system for a cryogenic refrigeration system in which liquid CO2, 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 CO2 flowing through the evaporator from air flowing adjacent thereto, comprising:
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(a) flow control means between the evaporator and the fluid driven motor; (b) temperature sensing means generating a signal indicating the temperature of CO2 delivered to the fluid driven motor; and (c) a heater between the evaporator and the fluid driven motor and associated with said flow control means and said temperature sensing means, said heater maintaining entropy of CO2 flowing to said fluid driven motor to permit isentropic expansion of the CO2 through the motor while preventing transformation of the CO2 to a solid state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control system for a cryogenic refrigeration system in which liquid CO2, 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 CO2 flowing through the primary evaporator from air flowing adjacent thereto, comprising:
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(a) flow control means between the primary and secondary evaporators; (b) temperature sensing means generating a signal indicating the temperature of CO2 delivered to the secondary evaporator; and (c) heater means between the primary and secondary evaporators and associated with said flow control means and said temperature sensing means, said heater means maintaining the heat capacity of CO2 flowing to said secondary evaporator to permit isentropic expansion of the CO2 through the secondary evaporator while preventing transformation of the CO2 to a solid state. - View Dependent Claims (8, 9, 10, 11)
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Specification