Patent ID: 6449969
Filing Date: 2002-09-17
Classification: F24F,F25B,F25D

Abstract:
A control method for controlling a coolant circulation system including a coolant circuit and a refrigerating or refrigerating/heating machine in which a portion of the coolant circuit passes through the refrigerating or refrigerating/heating machine and includes a coolant inlet and a coolant outlet provided at opposite ends thereof, with the output of the refrigerating or refrigerating/heating machine being controlled on the basis of a temperature of the coolant at either one of the coolant inlet or the coolant outlet of the coolant circuit, the control method comprising:controlling a flow rate of coolant flowing in the coolant circuit on the basis of a coolant temperature at the coolant inlet, wherein the output of the refrigerating or refrigerating/heating machine is controlled so that the temperature of coolant at the coolant outlet is maintained substantially constant, and during an intermediate-high cooling load operation, the flow rate of coolant is controlled so that the temperature of coolant at the coolant inlet is maintained substantially constant, whereas during a low cooling load operation, the flow rate of coolant is controlled to be maintained at a predetermined value.