HEAT PUMP UNIT USING NON-AZEOTROPIC REFRIGERANT

PROBLEM TO BE SOLVED: To improve the performance and to prevent frosting or freezing near the inlet of an evaporator. SOLUTION: The air conditioning heat pump unit using non-azeotropic refrigerant as the refrigerant comprises a compressor 20, a four-way valve 33, indoor heat exchangers 42a to 42n, e...

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Bibliographische Detailangaben
Hauptverfasser:	KAWAI YASUNARI, KITAI AKIRA, KYOGOKU HAJIME
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS,e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USERAPPLICATIONS COMBINED HEATING AND REFRIGERATION SYSTEMS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING REFRIGERATION MACHINES, PLANTS OR SYSTEMS REFRIGERATION OR COOLING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve the performance and to prevent frosting or freezing near the inlet of an evaporator. SOLUTION: The air conditioning heat pump unit using non-azeotropic refrigerant as the refrigerant comprises a compressor 20, a four-way valve 33, indoor heat exchangers 42a to 42n, expansion valves 43a to 43n, and outdoor heat exchangers 47a, 47b, and executes the superheat control for so controlling the opening of the expansion valve as to enhance the compressor suction side refrigerant temperature to higher than the saturated vapor temperature of the refrigerant of a low-pressure side circuit. Simultaneously, the number of revolutions of the compressor is controlled in response to the pressure of high or low pressure side. Further, a double tube heat exchanger 34 is provided on the way of the low-pressure side circuit to heat the refrigerant of the low-pressure side circuit when the low-pressure side pressure is low.