introduction of fans and blowers

7/25/2019 Introduction of Fans and Blowers

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Introduction of Fans and Blowers

Fans and Blowers use air for ventilation and

industrial process requirements. It generates

pressure to move air through ducts, dampers and

other components of the fan system.

Dierence of Fans and blowers

Fan is mechanical device is used to create a

continuous ow of air through the system. In any

cooling system which uses gas such as air as itsmain uid, fan is a compulsory unit for the system.

hen higher pressure is required, blowers are used

instead of fans.

!"#$ dierentiated fans blowers and air

compressor by getting the speci%c ration of

discharging pressure over suction pressure.

Fan &aws

'here are several fan laws that shows the

relationship between pressure, capacity, speed,

and power. "ome of the most useful fan laws are(

).*apacity directly proportional to speed+.ressure directly proportional to speed+

-.ower directly proportional to speed-


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*entrifugal Fan

!lso nown as squirrel cage for it resembles to ane/ercise cage of a squirrel. It produces air ow in

radial0 or perpendicular 1 direction relative to the

shaft. *entrifugal Fans are used in many industrial

processes and in air pollution control system.

*entrifugal fans are used in many industrial

processes because they are able to produce large

increases in air pressure. 'hey are often used in

grain drying and greenhouse ventilation. 'hese are

also common in air pollution control system as well

as 23!*.

!le/ander "abluov, )4-+ a 5ussian &ieutenant

6eneral discovered and contributed a lot to the

invention of centrifugal Fan.

!ir compressor

is anything that increases the amount of air that is

contained within a particular space. By pacing inthe air, the air pressure is increased.

2istory


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'he %rst air compressor was not a machine but it

was our lungs. 7ur ancestors made use of their

lungs by creating %re through blowing.

!s people began to melt metals a more powerful

compressor was required.

$gyptians and "umerian metallurgist %rst used

wind, then blowpipes for their wor. 'he %rst

mechanical compressor, was the hand0operated

bellows. !fter )899B.*. more e:cient foot bellows

came into use.

*tesibius. Discovered the elasticity of air and

invention of several devices using compressed air,

including force pumps and an air0powered catapult.

2eron designed and automatic temple door

opener, which used heat and pneumatics to open aset of temple doors.

In );


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severely limited the utility of these primitive

devices. ith the industrial revolution, the

mechanical compressor was born.

Due to the poor e:ciency of the early a/ial

compressors, papers in )>+9?s said that a practical

@et engine would be impossible to construct.

'hings changed after !lan !rnold 6ri:n published

a seminal paper noting that the reason because of

the e/isting compressors used at blades and were

essentially ying stalled.

Flying stalledA reduction in the life coe:cient

generated by a foil as angle of attac increases.

2e showed that the use of airfoils instead of at

blades would increase e:ciency to the point where

a practical @et was a possibility.

!ir *ompressor

Is a device that converts power using an electric

motor, diesel or gasoline engine, etc.C into

potential energy stored in pressuried air.

introduction of fans and blowers

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