| 摘要 |
PURPOSE:To circulate refrigerant obtained by a compressor to an indoor unit via an electronic expansion valve. CONSTITUTION:Refrigerant is circulated between an outdoor unit and an indoor unit via an electronic expansion valve. A temperature difference between a suction tube temperature of a compressor of an outdoor unit and an evaporating temperature is calculated by a first calculator 3 at each predetermined time, a time change rate of the calculated difference is calculated by a second calculator 5 based on the difference. On the other hand, a difference between a predetermined control temperature and its calculated difference is calculated by a third calculator 7, and the change rate and a difference between the predetermined control temperature and its calculated temperature difference are input to a controller 8. The controller 8 fuzzy-calculates an output control value (increased or decreased value) for varying an opening of the valve according to a predetermined control rule and a membership function. In this calculation, the greater the time change rate of the temperature difference is in a positive direction and the greater the predetermined control temperature and its calculated temperature difference are in a negative direction, the more the valve is opened. Further, the greater the change rate of the difference is in a negative direction and the greater the difference between the predetermined control temperature and the calculated temperature difference are in a positive direction, the more the valve is opened.
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