Air conditioning apparatus

An air conditioning apparatus comprising a control unit and a refrigerating cycle including an electric compressor that compresses gas refrigerant, a condenser that condenses high-pressure gas refrigerant by exchanging heat with outside air, an expansion valve that converts high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure liquid refrigerant, and an evaporator that vaporizes the low-temperature, low-pressure liquid refrigerant by exchanging heat with outside air, wherein

• the electric compressor is an inverter-integrated electric compressor that integrally includes a compressor, an electric motor that drives the compressor, and an inverter including a temperature detection unit that detects temperature in the vicinity of a semiconductor switching device as a inverter temperature,
• the control unit comprises:
• a storage part that stores
• a first information indicated a first high-low pressure characterized of the compressor according to a motive force of the compressor,
• a second information indicating a second high-low pressure characteristics of the compressor according to the inverter temperature,
• a third information indicating a third high-low pressure characteristics according to a discharge temperature of the compressor;
• and
• an arithmetic part configured to
• obtain, from the first information, the first high-low pressure characteristics of the compressor that corresponds to a current motive force,
• obtain, from the second information, the second high-low pressure characteristics of the compressor that corresponds to the inverter temperature detected by the temperature detection unit, and
• specify the combination of the high pressure and low pressure of the compressor and second high-low pressure characteristics of the compressor,
• specify the discharge temperature of the compressor that corresponds to the combination of the high pressure and low of the compressor fusing the third information,
• and estimate the discharge temperature of the compressor.