The heart of an evaporative cooling tower is ites fill-a packing of sort designed to provide the necessary contact area and contact time between air and water. If the fill is in good condition and clean, the tower will supply coo water in the amount and at the temperature that it was designed to provide; if the fill is damaged or plugged,or some of it is missing, the tower will not produce adequate cooling water.

There are three basic types of fill: splash, film, and hybrid. All are designed to efficiently mix air and water to facilitate the cooling of the water by evaporation.

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