Supercritical refrigerating cycle system

A supercritical refrigerating cycle system, comprising:

• a variable capacity compressor having a refrigerant delivery capacity corresponding to a compressor intake pressure;
• a heat exchanger for cooling a refrigerant delivered by the variable capacity compressor, the heat exchanger having an internal pressure exceeding a critical pressure of the refrigerant;
• a valve disposed on the outlet side of the heat exchanger and having a controllable aperture;
• an evaporator for evaporating refrigerant flowing out from the valve;
• a refrigerant temperature detector for detecting a temperature of the refrigerant on the outlet side of the heat exchanger;
• determining means for determining whether or not the refrigerant delivery capacity of the variable capacity compressor has changed;
• and
• control means for electrically controlling the aperture of the valve,
• wherein when it is determined by the determining means that the refrigerant delivery capacity has not changed, the control means controls the aperture of the valve based on a preset first program in correspondence with the temperature detected by the refrigerant temperature detector, and when it is determined by the determining means that the refrigerant delivery capacity has changed, the control means controls the aperture of the valve based on a second program that suppresses influence of the valve on the compressor.