Water-cooled chillers are almost always located inside of a building and remove heat from the chilled water by exhausting the heat to a second, isolated water line called the condenser water line. The condenser water return (CDWR) is pumped to a cooling tower. The cooling tower is almost always located outside of a building and removes heat from the condenser water by evaporating some of the condenser water into the atmosphere. As some of the condenser water evaporates, heat is removed from the condenser water, and the condenser water supply (CDWS) flows back to the chiller, where it is transferred heat from the chilled water line, and the process repeats.