Abstract: An air conditioner includes an air conditioning unit installed in a cabin, and a supply unit supplying air conditioned by the air conditioning unit to the cabin. The air conditioning unit includes a refrigeration cycle device having a compressor, a radiator, a decompression device, and an evaporator. One of the radiator and the evaporator functions as a use-side heat exchanger that generates conditioned air by heat exchange between refrigerant and air. The refrigeration cycle device has a high-pressure protection device that discharges the refrigerant to the outside when the pressure of the refrigerant flowing through a passage, which is defined from a refrigerant discharge side of the compressor to a refrigerant inlet side of the decompression device, exceeds a predetermined reference pressure. The high-pressure protection device is configured to discharge the refrigerant to the outside through an outside communication portion communicated with the outside of the cabin.

Abstract: An air conditioner includes an air conditioning unit installed in a cabin, and a supply unit supplying air conditioned by the air conditioning unit to the cabin. The air conditioning unit includes a refrigeration cycle device having a compressor, a radiator, a decompression device, and an evaporator. One of the radiator and the evaporator functions as a use-side heat exchanger that generates conditioned air by heat exchange between refrigerant and air. The refrigeration cycle device has a high-pressure protection device that discharges the refrigerant to the outside when the pressure of the refrigerant flowing through a passage, which is defined from a refrigerant discharge side of the compressor to a refrigerant inlet side of the decompression device, exceeds a predetermined reference pressure. The high-pressure protection device is configured to discharge the refrigerant to the outside through an outside communication portion communicated with the outside of the cabin.

Abstract: The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1). [ Formula ? ? 1 ] ? 0.10 ? ( N E M E · W E ) ( N P M P · W P ) ? 1.

Abstract: The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1). [ Formula ? ? 1 ] ? 0.10 ? ( N E M E · W E ) ( N P M P · W P ) ? 1.