Generally, cooling towers fall under one of two categories:
Counterflow Cooling Towers
In counterflow cooling towers, air enters through the open area below the exchange surface and is drawn up vertically. Air travels vertically across the infill, opposite to the downward motion of the water. Hot Water is sprayed through the water distribution nozzles and flows downward through the infill, opposite to the air flow.
Crossflow Cooling Towers
In counterflow cooling towers, air enters through one or more vertical faces of the cooling tower, and it moves horizontally through the infill sheets. Hot water distributed over the tower by means of orifices in the hot water basin floor. The hot water flow down to the heat exchange surfaces by gravity and the air pass through the water flow into an open plenum chamber.
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