In most process cooling applications, apumping system circulates cool water or a water/glycol solution from thechiller to the process. This cool fluid removes heat from the process and thewarm fluid returns to the chiller. The process water is the means by which heattransfers from the process to the chiller.
Process chillers contain a chemicalcompound, called a refrigerant. There are many types of refrigerant andapplications depending on the temperatures required but they all work on thebasic principle of compression and phase-change of the refrigerant from aliquid to a gas and back to a liquid. This process of heating and cooling therefrigerant and changing it from a gas to a liquid and back again is therefrigeration cycle.
The refrigeration cycle starts with alow-pressure liquid/gas mix entering the evaporator. In the evaporator, heatfrom the process water or water/glycol solution boils the refrigerant, whichchanges it from a low-pressure liquid to a low-pressure gas. The low-pressuregas enters the compressor where it is compressed to high-pressure gas. Thehigh-pressure gas enters the condenser & condenser water removes heat tocool it to a high-pressure liquid. The high-pressure liquid travels to theexpansion valve, which controls how much liquid refrigerant enters theevaporator, thereby beginning the refrigeration cycle again.
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