Refrigeration – Storage of solidified or liquified gas – Liquified gas transferred as liquid
Patent
1993-02-16
1994-02-22
Wayner, William E.
Refrigeration
Storage of solidified or liquified gas
Liquified gas transferred as liquid
62217, 62223, F17C 904
Patent
active
052877051
ABSTRACT:
A refrigeration system which controls the temperature 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 CO.sub.2 or N.sub.2, in a heat exchanger. In an apparatus embodiment, 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 embodiment 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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Roehrich Roland L.
Viegas Herman H.
Moran M. J.
Thermo King Corporation
Wayner William E.
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