What is meant by induced draft in cooling tower? (Diagram, Schematic,operation principle of cooling tower)

What is meant by induced draft in cooling tower?


Induced draft means we create (induce) some pressure draft (difference) using I.D Fans (Induced draft Fans) on the top Cooling tower.

Here we use a high efficiency fans to suck the air from the bottom of the cooling tower and it discharges air to atmosphere at high velocities. Typical Induced Draft cooling tower is as shown in the figure.

During this movement of air from bottom to the top of cooling tower water comes in contact with air in counter current direction and cooling of water takes place by means of evaporation cooling.

“By using any of the cooling towers we can cool the water up to its wet bulb temperature of the environment.”

Typical Induced draft cooling tower is as shown in the figure:

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