Patent ID: 6276152
Filing Date: 2001-08-21
Classification: F25B,F25D,F28B,F28F,G05D

Abstract:
A chiller system including a chilled fluid loop where the temperature of the fluid is controlled by varying the capacity of a chiller comprising:a variable capacity chiller including an evaporator;a chilled fluid loop in heat transfer relation with the evaporator;a sensor measuring the leaving fluid temperature of the evaporator;a sensor measuring the entering fluid temperature of the evaporator;a mechanism for providing a desired leaving fluid temperature;a pump controlling the rate of fluid flow in the fluid loop; anda controller operably controlling the chiller capacity and the variable flow rate of the pump, the controller being connected to the setpoint mechanism and the entering and leaving fluid temperature sensors;wherein the controller includes a feedback loop controlling chiller capacity in response to leaving fluid temperature and wherein the controller includes a feed forward loop controlling chiller capacity in response to entering fluid temperature.