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- The fluid to be cooled (usually water) flows through the
tubes of the coil without coming into direct contact with
the external air, preventing dirt or pollution from entering
the primary water circuit. The heat is transmitted from
the fluid through the tube walls to the water, which is
being continuously sprayed over the coil.
- The fan situated at the top of the tower intakes air
in counterflow to the water, thereby evaporating a small
part of the re-circulating water, drawing off the necessary
heat for evaporation and releasing it into the atmosphere.
The rest of the water is re-circulated with a spray water
pump from the basin to the spray nozzles. (Secondary circuits).
A small quantity of heat is transmitted by convection to
the external air, just as for an air cooler.
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