Open Circuit Cooling Tower is a heat exchanger that uses direct contact between air and water to cool water. In the open circuit cooling tower, the incoming water (requiring cooling) is pumped to the upper part of the cooling tower and enters the tower from there. The nozzles distribute this water on the packings of the cooling tower, and the water flows as a thin and uniform layer on the packings, and this increases its contact surface (heat exchange) with the air.

The fan also circulates atmospheric air on the packings. The incoming air cools the water in two different ways; Part of the heat is removed as a result of air convection (contact between hot water and colder air), but the majority of cooling occurs due to the evaporation of part of the water entering the system. In this way, water can be cooled down to a lower temperature than the ambient temperature. After the water falls from the packings, the cooled water accumulates in the tower pan and finally returns to the system cycle. The air, which is saturated with moisture, leaves the upper part of the cooling tower. The drip catcher installed on top of the nozzles also prevents water drops from leaving the cooling tower.

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