Air conditioning and refrigeration systems utilizing a cryogen

A refrigeration system (10) which controls the temperature of a conditioned space (12) 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 (44). In an apparatus embodim...

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Bibliographische Detailangaben
Hauptverfasser:	VIEGAS, HERMAN HERMOGIO, ROEHRICH, ROLAND LOUIS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING,OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODSSPACES OF VEHICLES BLASTING COLD ROOMS COMBINED HEATING AND REFRIGERATION SYSTEMS COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS HEAT PUMP SYSTEMS HEATING ICE-BOXES LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING PERFORMING OPERATIONS RANGES REFRIGERATION MACHINES, PLANTS OR SYSTEMS REFRIGERATION OR COOLING REFRIGERATORS TRANSPORTING VEHICLES IN GENERAL VENTILATING WEAPONS
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Beschreibung
Zusammenfassung:	A refrigeration system (10) which controls the temperature of a conditioned space (12) 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 (44). In an apparatus embodiment, a controller (66) determines a desired evaporation vapor pressure value (EPX) of the cryogen as a function of the selected set point temperature (SP), and then controls (EPV) 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 (FCV) 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 (178,179) a desired evaporation vapor pressure value (EPX) of the cryogen as a function of the selected set point temperature (SP), controlling (180-196) the evaporation pressure in the heat exchanger means as a function of the desired evaporation vapor pressure value, providing (208,179) 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 (202-216) 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.