Chillers effectively remove heat from a liquid by means of vapor-compression. In short, chillers are a machine used to cool something. Chillers refer to the use of a cold cabinet or a refrigerator which keeps stored food a few degrees above freezing. Chillers also is in reference to air conditioning systems wherein chilled water is distributed to heat exchangers to cool the air in respective spaces, and then re-circulated back to the chiller to be cooled again. Chillers are used extensively in almost all industries, commercial and household residences.