To save energy by always maintaining a high coefficient of performance in a refrigerating cycle device with a refrigerant operated at a supercritical pressure on a high-pressure side.
This refrigerating cycle device comprises a memory 10a holding a relation between the outlet pipe temperature of a high-pressure side heat exchanger (outdoor heat exchanger 2 in cooling, indoor heat exchanger 6 in heating) and a high-pressure range in which the coefficient of the performance of a refrigerating cycle is maximized, pipe temperature detectors 20 to 23 detecting the outlet pipe temperature of the high-pressure side heat exchanger or the temperatures of pipes starting at a compressor 1 to the high-pressure side heat exchanger, and a controller 10 controlling, in a high-pressure range, the opening of an electronic expansion valve, the rotational speed of the compressor 1, and the rotational speed of an indoor fan 7 or an outdoor fan 3 based on the pipe temperatures detected by the pipe temperature detectors 20 to 23 and the optimum relation in the memory.
|JP58000030||OPERATION CONTROL FOR VARIABLE CAPACITY COMPRESSOR IN COOLING APPARATUS|
|JP06002933||CONTROLLER FOR AIR CONDITIONER|
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