A basicchiller has two circuits: the water circuit, and the refrigeration circuit:
In the water circuit,a pump circulates water from tank to evaporator, which cools water bytransferring heat to a refrigerant, waterthen goes on to the process in a chiller or back to the tank in a packaged orcentral chiller.
In the refrigeration circuit, the evaporator boils theliquid refrigerant into a gas for cooling the water, the compressor increasesthe pressure of the refrigerant gas to a pressure (200 to 220 psi for freon 22)so that the condenser can condense the gas back to a liquid (remove the heatgained) using ambient air at 35C or cooling tower water at 30C.
In the caseof an industrial chiller, the principle is the same. Water is pumped to thechiller normally at 15C and cooled to 10C, when using water/glycol solution canbe cooled to -40C. The heat is removed from the condenser either by a coolingtower, or outdoor air for remote condenser and outdoor air cooled chillers, orby plant air for portable or indoor heat reclaim chillers.