Answer Posted / alok prabhu

Natural draught cooling towers use very tall concrete
chimneys to introduce air through the media.Due to large
size of these towers they are generally used for flow rates
above 45,000m^3/hr.These types are used only by utility
power stations.It is used where WET BULB TEMP is
low.Temperature difference achieved is 6-8deg C.

Induced draught/Mechanical draught cooling towers used
large fans to force air through circulating water.The water
falls downwards over fill surfaces which helps increase
contact time between water and air.cooling rate depends
upon fan diameter and speed of operation.It is used where
WBT is more.Used for critical applications.Temp difference
achieved can be 2-15deg C.When fan is switched off it works
as a natural draught cooling tower.

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