Abstract: A refrigerating apparatus, where refrigerant reaches a supercritical state in at least part of a refrigeration cycle, includes at least one expansion mechanism, an evaporator connected to the expansion mechanism, first and second sequential compression elements, a radiator connected to the discharge side of the second compression element, a first refrigerant pipe interconnecting the radiator and the expansion mechanism, a heat exchanger arranged to cause heat exchange between the first refrigerant pipe and another refrigerant pipe. Preferably, a heat exchanger switching mechanism is switchable so that refrigerant flows in the first refrigerant pipe through the first heat exchanger or in a heat exchange bypass pipe connected to the first refrigerant pipe.

Abstract: A refrigerating apparatus, where refrigerant reaches a supercritical state in at least part of a refrigeration cycle, includes at least one expansion mechanism, an evaporator connected to the expansion mechanism, first and second sequential compression elements, a radiator connected to the discharge side of the second compression element, a first refrigerant pipe interconnecting the radiator and the expansion mechanism, a heat exchanger arranged to cause heat exchange between the first refrigerant pipe and another refrigerant pipe. Preferably, a heat exchanger switching mechanism is switchable so that refrigerant flows in the first refrigerant pipe through the first heat exchanger or in a heat exchange bypass pipe connected to the first refrigerant pipe.

Abstract: A hot heat source heat exchanger (1) receives heat from a primary refrigerant circuit (A) to evaporate liquid refrigerant. The hot heat source heat exchanger (1) is connected to a cold heat source heat exchanger (2) through a gas flow pipe (4) and a liquid flow pipe (5). An indoor heat exchanger (3) is connected to the gas flow pipe (4) through a gas pipe (6) and connected to the liquid flow pipe (5) through a liquid pipe (7). Gas refrigerant evaporated in the hot heat source heat exchanger (1) flows into at least the cold heat source heat exchanger (2). In the cold heat source heat exchanger (2), the gas refrigerant is condensed and refrigerant flow with respect to the indoor heat exchanger (3) is changed in accordance with a cooling or a heating operation requested by the indoor heat exchanger. In the indoor heat exchanger (3), refrigerant is condensed or evaporated.

Abstract: An air conditioner outdoor unit is made to be compacted and achieve a reduced noise level and a reduced installation space. A U-shaped heat exchanger 3 is provided so that it encloses a cross flow fan 2. A heat exchange unit 1A including the cross flow fan 2 and the heat exchanger 3 is arranged in an upper position and a machine room unit 1B including a compressor 5 is arranged in a lower position so that they are integrated into one body with a casing 7 having an identical cross section shape. A fan motor 4 and a shut-off valve 21 are provided at the upper end of the casing 7, by which an outdoor unit having an upright thin slim structure including a top joint structure capable of arranging piping in the upper position is provided.