| 摘要 |
PROBLEM TO BE SOLVED: To prevent a decrease in a refrigerating capacity when a rotational speed of a compressor is decelerated. SOLUTION: When a rotational speed of a compressor 1 is decelerated so that a pressure of a low pressure side becomes a prescribed value or more, an opening of a pressure control valve 3 is reduced to enhance an output side refrigerant pressure of a radiator 2 to higher than a prescribed pressure decided by an optimum control lineηmax, and the opening of the valve 5 is reduced to increase a heating degree to larger than a prescribed value. Thus, since a specific enthalpy difference of an evaporator 6 can be increased, even when the rotational speed to the compressor 1 is decelerated, it can prevent a refrigerating capacity from being largely lowered.
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