Patent ID: 7581409
Filing Date: 2009-09-01
Classification: F25B,Y02B,Y10S

Abstract:
1. A method for cooling one or more parts of a building or processes comprising the steps of: providing a compressor, a condenser having an inlet and an outlet, a receiver, a liquid refrigerant pump, an expansion device, an evaporator, the evaporator being surrounded by a chiller barrel having a cooled water return and a chilled water supply line, and refrigerant line means interconnecting the compressor, condenser, expansion device and evaporator in series, in a closed loop for circulating refrigerant therethrough; providing a plurality of condenser fans; providing a condenser inlet refrigerant temperature sensor at the condenser inlet and a condenser outlet temperature sensor at the condenser outlet; providing a line for the refrigerant to bypass the compressor; providing a line for the refrigerant to bypass the expansion device; monitoring the coolant requirements of the building to determine when free cooling is appropriate; bypassing the compressor; bypassing the expansion device; soft starting the liquid refrigerant pump; and increasing or decreasing the speed of the condenser fans to maintain a specific condenser output temperature.