To defrost an outdoor heat exchanger in a refrigerating apparatus performing multiple-stage compression while allowing an indoor heat exchanger to function as a radiator.
An air conditioning apparatus 10 includes a four-stage compressor 20, a fourth heat exchanger 44 that functions as a radiator during a cooling operation and functions as an evaporator during a heating operation, and first to third heat exchangers 41-43 that function as a radiator which cools an intermediate pressure refrigerant inhaled into high-stage compression parts 22-24 during the cooling operation and functions as an evaporator during the heating operation. One of first to fourth heat exchangers 41-44 functions as a radiator during a defrosting operation, the other heat exchangers function as evaporators, and an indoor heat exchanger 12a functions as a radiator.
OKAMOTO TETSUYA
YO KUNITADA
KOSHO KAZUHIRO
