Closed circui cooling tower
In closed circuit cooling towers, there is no direct contact between the cooling of the water (or water-glycol mixture) and the air. If the water to be cooled cannot come into contact with the air (eg in the food industry) a heat exchanger should be used. The heat exchanger separates the water to be cooled from the “evaporation” cooling water of the cooling tower. This avoids contact of the water you want to cool with the air. It is not necessary to use antifreeze in open circuit cooling towers, but it is possible to use antifreeze in closed cooling towers. The cooling water is circulated in the cooling tower by a built-in pump.