A cooling tower is a heat rejection device, which extracts
waste heat to the atmosphere though the cooling of a water stream to a lower
temperature.
The type of heat rejection in a Cooling Towers in Pakistan is termed "evaporative" in that it allows
a small portion of the water being cooled to evaporate into a moving air stream
to provide significant cooling to the rest of that water stream hundreds of
thousands of gallons per minute supplied in pipes as much as 15 feet (about 5
meters) in diameter on a large power plant.
The generic term "Cooling towers" is used to describe both direct (open
circuit) and indirect (closed circuit) heat rejection equipment.
While most think of a "Cooling towers"
as an open direct contact heat rejection device, the indirect cooling tower,
sometimes referred to as a "closed circuit cooling tower" is
nonetheless also a cooling tower.
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