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In a counterflow design the air flow
is directly opposite of the water flow (see diagram
below). Air flow first enters an open area beneath
the fill media and is then drawn up vertically. The
water is sprayed through pressurized nozzles and
flows downward through the fill, opposite to the air
flow.
Common to both designs:
The interaction of the air and water flow allow a
partial equalization and evaporation of water.
The air, now saturated with water vapor, is
discharged from the cooling tower.
A collection or cold water basin is used to contain
the water after its interaction with the air flow.
Both crossflow and counterflow designs can be used
in natural draft and mechanical draft cooling
towers.
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