Air conditioning and refrigeration systems utilizing a cryogen

Details Air conditioning and refrigeration systems utilizing a cryogen Air conditioning and refrigeration systems utilizing a cryogen

F - Mech Eng,Light,Heat,Weapons

25

B

F25B 19/00 (2006.01) B60H 1/32 (2006.01) F24F 3/06 (2006.01) F25D 29/00 (2006.01) F24F 1/00 (2006.01)

Patent

CA 2115809

ABSTRACT OF THE DISCLOSURE A refrigeration system which controls the tempera- ture of a conditioned space to a predetermined temperature range adjacent to a selected set point temperature SP via a cooling cycle which includes evaporation a cryogen, such as CO2 or N2, in a heat exchanger. In an apparatus embodi- ment, a controller determines a desired evaporation vapor pressure value EPX of the cryogen as a function of the selected set point temperature SP, and then controls the evaporation pressure EP in the heat exchanger means as a function of the determined desired evaporating vapor pressure value. The controller further determines a desired superheat value SHX of the cryogen exiting the heat exchanger means as a function of the selected set point temperature SP, and controls the mass flow rate of liquid cryogen evaporating in the heat exchanger as a function of the determined desired superheat value. A method embodi- ment includes the steps of providing a desired evaporation vapor pressure value EPX of the cryogen as a function of the selected set point temperature SP, controlling the evaporation pressure in the heat exchanger means as a function of the desired evaporation vapor pressure value, providing a desired superheat value SHX of the cryogen exiting the heat exchanger means as a function of the selected set point temperature SP, and controlling the mass flow rate of liquid cryogen from the cryogenic cooling means to the heat exchanger means as a function of the desired superheat value.

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