REFRIGERATION AIR CONDITIONING DEVICE

摘要

A sufficient heating capacity can be displayed even in cold districts with atmospheric temperatures of -10°C or less by improving the heating capacity in the refrigerant air conditioner much more than that of conventional gas injection cycles. In a refrigerant air conditioner having circularly connected a compressor 3, a room heat exchanger 6, a first pressure reducing device 11, and an outdoor heat exchanger 12, for supplying hot heat from the room heat exchanger, the refrigerant air conditioner includes a first internal heat exchanger 9 for exchanging heat of refrigerant between the room heat exchanger and the first pressure reducing device with heat of refrigerant between the outdoor heat exchanger and the compressor; an injection circuit 13 for bypassing part of the refrigerant between the room heat exchanger and the first pressure reducing device so as to inject it into a compression chamber within the compressor; a pressure reducing device for injection 14 provided along the injection circuit; and a second internal heat exchanger 10 for exchanging heat of refrigerant reduced in pressure by the pressure reducing device for injection with heat of the refrigerant between the room heat exchanger and the first pressure reducing device.