AIR-CONDITIONING APPARATUS

摘要

This air-conditioning apparatus is provided with: a refrigeration cycle configured by connecting a compressor (10), a refrigerant flow passage switching apparatus (11), a first heat exchanger (12), a first choke apparatus (16), and a second heat exchanger (15) via a refrigerant pipe; an intake injection pipe (4c) for introducing a refrigerant to the intake side of the compressor (10); and a second choke apparatus (14b) provided to the intake injection pipe (4c). The air-conditioning apparatus is also provided with a third choke apparatus (14a). During heating operation in which the first heat exchanger (12) is supplied with the refrigerant of a low pressure to operate as an evaporator while the second heat exchanger (15) is supplied with the refrigerant of a high pressure to operate as a condenser, the third choke apparatus (14a) produces an intermediate pressure smaller than the high pressure and greater than the low pressure in a refrigerant flow passage from the second heat exchanger (15) to the first heat exchanger (12). The upstream side of the third choke apparatus (14a) and the upstream side of the second choke apparatus (14b) are connected, and, during the heating operation, the refrigerant of intermediate pressure is introduced to the intake side of the compressor (10) via the second choke apparatus (14b) and the intake injection pipe (4c).