A chiller is a refrigerated recirculating liquid cooling system consisting of a compressor, condenser, evaporator, pump and temperature controller. The chiller recirculates temperature-controlled fluid to the application to remove heat. The heat is picked up by the recirculating fluid and is returned to the chiller. The chiller cools the fluid to the setpoint specified by the user and then is recirculated back to the application.
Hot-gas bypass can provide stable fluid temperatures without increasing power consumption. Extremely cold liquid refrigerant cools the recirculating fluid via a coil in the fluid reservoir or through a heat exchanger. As the refrigerant removes heat from the recirculating fluid, it changes state to a hot gas. If the fluid requires more cooling, the hot gas is sent to the compressor and condenser to return to a cold liquid state. If the fluid must be heated, the hot gas is routed back directly to the coil or heat exchanger by a solenoid. Running the compressor continually ensures the chiller will be more reliable and have a longer life.