Abstract: A method for managing the operation of a refrigerated truck for transporting heat-sensitive products, of the indirect-injection type, in which the parameter ?T=Tair inlet?Tsetpoint(Tair inlet: temperature of the air coming into contact with the heat exchanger internal to the truck as a result of the action of the fan, Tsetpoint: temperature to be set in the chamber inside the truck) is determined in real time and in which if ?T is greater than an upper setpoint value ?Tsetpoint H, a rapid-pressurization (RMP) circuit is activated to vaporize some cryogen and thus increase the pressure in the head of gas above the reserve of cryogen of the truck.

Abstract: When a preset protection temperature is exceeded, an air conditioning device for a vehicle equipped with air conditioner inverter protection means works to lower the output of the air conditioner inverter. This lowers the output of the air conditioner inverter, whereby heat is released in decreased amounts from the coolant through a first heat exchanger suppressing a rise in the temperature of the EV cooling water.

Abstract: Methods and apparatus for controlling the air temperature of a conditioned space to a selected set point temperature, utilizing a supply of cryogen in liquid and vapor states. The two states are drawn from the supply and maintained in first and second separate, independent flow paths. The liquid cryogen provides a cooling mode for the conditioned space via a heat exchanger disposed in the first flow path, and the vaporized cryogen provides a cooling mode for the conditioned space via a heat exchanger disposed in the second flow path. Cryogen flowing in at least one of the flow paths is used to drive a vapor motor connected to a fan, with the fan moving air between the conditioned space and at least one of the heat exchangers. Heat is applied to the cryogen as required to hold the set point temperature, or to defrost a heat exchanger.

Abstract: Methods and apparatus for controlling a conditioned space to a predetermined set point temperature, utilizing a supply of cryogen. Cryogen is drawn from the supply in a flow path to provide a cooling mode via a heat exchanger disposed in the flow path. A vapor motor in the flow path, downstream from the heat exchanger, drives a fan which moves air between the conditioned space and the heat exchanger. Heat is applied to the cryogen downstream from the heat exchanger, after all cooling modes have been performed, to provide the desired fan horsepower, without interfering with a cooling cycle. A by-pass flow path selectively directs cryogen directly to the vapor motor, by-passing the heat exchanger, to provide air circulation in the conditioned space when the temperature of the conditioned space is satisfied.

Abstract: Methods and apparatus for controlling the temperature of a conditioned space, including a supply of cryogen, and a fluid flow path for the cryogen which includes a heat exchanger. A heater is disposed to heat cryogen in the flow path in response to predetermined conditions, and a cryogen pre-heater is disposed to aid the heater. In a first embodiment, the pre-heater is aided by directing warm cryogen in heat exchange relation with cryogen flowing through the pre-heater, with the warm cryogen being taken from a point downstream from the heat exchanger. In another embodiment, the heater generates heated gases as a by-product, with the pre-heater being aided by directing the heated gases in heat exchange relation with cryogen flowing through the pre-heater.

Abstract: Methods and apparatus for controlling the temperature of a conditioned space to a predetermined set point temperature, utilizing a supply of cryogen in liquid and vapor states. The two states are drawn from the supply in two separate flow paths. The liquid cryogen is vaporized in a heat exchanger, and the two flow paths are then combined. The combined cryogen is used to drive a vapor motor connected to a fan, with the fan moving air between the conditioned space and the heat exchanger. Heat is applied to the cryogen as required to hold the set point temperature or to defrost the heat exchanger. In a preferred embodiment, the cryogen is added to a first vessel at the pressure provided by ground support apparatus, and expanded into a second vessel as a function of system conditions, to provide the supply of cryogen in both the liquid and vapor states.

Abstract: A portable refrigeration machine includes a vertically oriented pressure vessel containing carbon dioxide in gaseous, liquid and/or solid states. A heat exchanger is secured to the lower external portion of the vessel and an outer housing surrounds the vessel to leave an annulus between the exterior wall of the vessel and the interior wall of the housing. A gas pressure operated fan is disposed beneath the heat exchanger and connected for operation by gas pressure from the vessel to rotate. The fan draws in air through appropriate lower inlet openings which air passes through the heat exchanger and annulus out outlet opening to thereby cool and circulate the air in a compartment within which the portable refrigeration machine is placed.