Patent ID: 6959558
Filing Date: 2005-11-01
Classification: F25B

Abstract:
1. A method for regulating coolant fluid flow in a condenser of a vapor compression refrigeration system including a compressor, the method comprising: providing a controller; receiving signals at the controller representative of a monitored discharge pressure in a discharge line of the compressor; and using the controller to provide a control signal to an actuator that controls a flow control valve that, in turn, controls coolant fluid flow into the system, the control signal being responsive at least in part to a difference between a set point pressure and the monitored discharge pressure, wherein using the controller to provide a control signal to the actuator comprises: if the controller is in a hold position state, if the monitored discharge pressure minus the set point pressure is above a pre-selected value, and if the monitored discharge pressure is not decreasing, then entering an opening valve state; and if the controller is in the hold position state, if the monitored discharge pressure minus the set point pressure is below a pre-selected value and if the monitored discharge pressure is not increasing, then entering a closing valve state.