Refrigerant circulating arrangement

The degree (SH) of superheat of a refrigerant in evaporators (12 and 22) is sensed. The opening of expansion valves (11 and 21) is controlled so that the sensed each degree of superheat (SH) may equal a first preset value (SHs). The deviation ( DELTA SH) of the sensed each degree of superheat (SH) f...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHINOBU FUJITA, TAKAYUKI KAMBE, TOORU KUBO
Format:	Patent
Sprache:	eng
Schlagworte:	AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING BLASTING COMBINED HEATING AND REFRIGERATION SYSTEMS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING RANGES REFRIGERATION MACHINES, PLANTS OR SYSTEMS REFRIGERATION OR COOLING VENTILATING WEAPONS
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Beschreibung
Zusammenfassung:	The degree (SH) of superheat of a refrigerant in evaporators (12 and 22) is sensed. The opening of expansion valves (11 and 21) is controlled so that the sensed each degree of superheat (SH) may equal a first preset value (SHs). The deviation ( DELTA SH) of the sensed each degree of superheat (SH) from the first preset value (SHs) is sensed, and the maximum value ( DELTA SHmax) of the deviations sensed is sensed one after another. When the latest maximum value ( DELTA SHmax(n)) sensed is decreased blow the preceding maximum value ( DELTA SHmax(n-1)) sensed, the amount of change is sensed. It is judged whether or not the amount of change D sensed is 2 DEG C or lower and the latest maximum value ( DELTA SHmax(n)) is 1 DEG C or higher. When the conditions in this judgment are met twice consecutively, the opening control value for the expansion valves (11 and 21) is corrected in a decreasing direction.