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FORCED
DRAUGHT
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INDUCED
DRAUGHT
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Apparent
Wet Bulb of area Increases:
This is because of the fact that the warm and moist air
surrounding the Cooling Tower has the tendency to get sucked
in because of the suction of fan. This increases the apparent
wet bulb temperature, and the Cooling Tower ceases to give
the desired Approach. |
No
Such thing happens in this case. The air that is thrown
out from the top of the Cooling Tower has no chance of getting
back into the Cooling Tower. The push of the fan adds to
the upward thrust of the warm air. |
It
can only be square or rectangular shaped:
A Forced draught Cooling Tower always has a fan on the side.
Due to this the Cooling Tower cannot be bottle shaped. Further,
due to this characteristic the water distribution system
cannot be that of a sprinkler form. This results in inefficient
water distribution. |
The induced draught can be square as well as round. The
distribution systems is that of a sprinkler which is considered
to be the most efficient water distribution system. |
Noise
Level:
The noise level in a forced draught Cooling Tower is very
high. This is because of the placement of the motor. Since
it is placed on the side of the Cooling Tower, it comes
with the level of the observer |
Noise level is very low, because the fan and motor are placed
on the top of the Cooling Tower. They are not in level with
the observer |
Convertibility:
A forced draught Cooling Tower cannot be a cross flow type
model. |
An induced draught can be either cross flow or counter flow.
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Maintenance:
It is difficult to maintain this type of a Cooling Tower.
Because of the inaccessibility of this fills. |
The parts of this type of cooling Tower are easily accessible
and there is no problem in their maintenance
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