| 摘要 |
PROBLEM TO BE SOLVED: To control suction moist with high controllability in using R32 as a refrigerant, in an air conditioning device having a refrigerant circuit that is provided with expansion valves at an upstream side and a downstream side of a receiver and injects a gas refrigerant from the receiver to a compressor.SOLUTION: In an air conditioning device 1, degassing control is executed to guide a gas refrigerant from a receiver 25 to a suction side of a compressor 21 through a receiver degassing pipe 30 by opening a receiver degassing valve 30a; upstream-side expansion valve supercooling degree control is executed to change openings of upstream-side expansion valves 24, 26 so that a supercooling degree of the refrigerant at outlets of radiators 23, 41 is kept at a target supercooling degree; and further downstream-side expansion valve suction moist control is executed to change openings of downstream-side expansion valves 26, 24 so that a dryness degree of the refrigerant is kept at a target dryness degree in a state that the refrigerant at the outlets of evaporators 41, 23 is moist. |
