| 摘要 |
PROBLEM TO BE SOLVED: To provide the controller of a freezing cycle which can reduce the cost of the freezing cycle and the total weight by avoiding the use of high heat-resistant material, can minimize the deterioration of cooling performance, and can enhance the reliability on the aging of seal material or a pipe. SOLUTION: This controller has a freezing cycle 1 which is equipped with at least a compressor 2 which can change the discharge capacity by adjusting the quantity of control to be inputted, from outside, and also can boost a refrigerant to a supercritical region, a radiator 3 which cools a refrigerant compressed with the compressor 2, an expander 5 which depressurizes the refrigerant cooled by the radiator 3, an evaporator 6 which evaporates the refrigerant depressurized with the expander 5, and an internal heat exchanger 4 which heat- exchanges the refrigerant having flown out of the evaporator 5 and the high- pressure refrigerant before reaching the expander 5. In the case where it is judged that the temperature of the refrigerant having flown out of the compressor 2 is higher than the prescribed temperature, this changes the quantity of control of the compressor 2 is changed so as to suppress the discharge capacity. |
