AIR-CONDITIONING DEVICE, MANAGEMENT DEVICE, AND REFRIGERANT CONNECTION PIPE

WIPO Patent Application WO/2020/067428

A1

The objective of the present invention is to determine, with a high degree of accuracy, whether the amount of refrigerant in a refrigerant circuit is appropriate. An air-conditioning device (10) has a refrigerant circuit (11) in which a plurality of indoor units (40, 50, 60) respectively having indoor heat exchangers (42, 52, 62) and indoor expansion valves (41, 51, 61), and an outdoor unit (20) having an outdoor expansion valve (38), are connected by means of liquid refrigerant connection piping (71). In addition, this air-conditioning device (10) controls the operation and stopping of the indoor units (40, 50, 60) individually. The air-conditioning device (10) is equipped with a control unit (80) and a determination unit (90). The control unit (80) controls the degree of opening of the indoor expansion valves (41, 51, 61) and the degree of opening of the outdoor expansion valve (38) when at least one of the indoor heat exchangers (42, 52, 62) functions as a radiator. The determination unit (90) determines whether the amount of refrigerant in the refrigerant circuit (11) is appropriate on the basis of an amount of change corresponding to a change in the state of the refrigerant between the indoor expansion valves (41, 51, 61) and the outdoor expansion valve (38).

HIKAWA TAKESHI
KASAHARA SHINICHI
YOSHIMI MANABU

PCT/JP2019/038176

April 02, 2020

September 27, 2019

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DAIKIN IND LTD (JP)

F25B49/02; F24F11/36; F24F140/20

WO2007049372A1	2007-05-03
WO2011161720A1	2011-12-29

JPH1183250A	1999-03-26
JP2012032108A	2012-02-16
JP2009210142A	2009-09-17
JP2008164265A	2008-07-17
JP2014115011A	2014-06-26
JP5164527B2	2013-03-21

See also references of EP 3859247A4

SHINJYU GLOBAL IP (JP)

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