| 摘要 |
PROBLEM TO BE SOLVED: To estimate a value of one temperature sensor of a compressor from a detected temperature value from the other temperature sensor located at either an inlet or an outlet of the compressor and from pressure values from pressure sensors at the inlet and the outlet of the compressor. SOLUTION: A temperature computing means 41 which computes a signal from a temperature sensor provided in the vicinity of either an inlet or an outlet of a compressor, a pressure computing means 42 which computes signals from pressure sensors provided in the vicinities of the inlet and the outlet of the compressor respectively, a refrigerant circulation amount computing means 43 which computes the amount of circulation of a refrigerant from a pressure value of the pressure computing means and an alternative temperature computing means 46 or 49 which computes the enthalpy of the compressor 1 on the basis of the amount of circulation of the refrigerant computed by the refrigerant circulation amount computing means 43 and computes an outlet temperature when an inlet temperature is known or the inlet temperature when the outlet temperature is known, are provided. Thereby the inlet and outlet temperatures of the compressor are detected by one temperature sensor and reduction of the cost is enabled. |
