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Fans and Blowers

The document defines fans, blowers, and exhausters, highlighting their functions in moving gas and air under pressure. It includes illustrative problems related to calculating static air power, motor size, horsepower, brake power, and adjustments for changes in air delivery requirements. Additionally, it presents an assignment involving the performance rating of a fan under varying conditions.

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Kyla Acs
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126 views10 pages

Fans and Blowers

The document defines fans, blowers, and exhausters, highlighting their functions in moving gas and air under pressure. It includes illustrative problems related to calculating static air power, motor size, horsepower, brake power, and adjustments for changes in air delivery requirements. Additionally, it presents an assignment involving the performance rating of a fan under varying conditions.

Uploaded by

Kyla Acs
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Fans and Blowers

DEFINITION:

❖ A fan is a machine used to apply power to a gas to increase its energy


content thereby causing it to flow or move.

❖ A blower is a fan used to force air under pressure which means resistance
to gas flow is imposed upon discharge.

❖ An exhauster is a fan used to withdraw air under pressure which means


resistance to gas flow is imposed upon suction.
Illustrative Problems
1.A fan is designed to deliver 900 m³/hr with a
static pressure of 5 cm of water column on full
delivery. What is the static air power in watts?
2.An induced draft fan is used to extract 270,000
m³ of flue gas per hour from a boiler furnace.
The fan is to deliver at a total pressure of 250
mm water gage. Determine the size of the
electric motor in kW if a mechanical efficiency
of 55% is considered.
3. What horsepower is supplied to air moving at 30
fpm through a circular duct with a radius of one
foot under a pressure of 6 in water gage?
4. An industrial fan operating at a standard
conditions of 1 atm, 21.1°C develops a power
output of 0.1 MW at a head of 200 mm water gage.
Calculate for the brake power in kW if the fan is
operated in an environment of 97 kPa, 27°C at the
same speed.
5. A fan used to provide ventilation in a tunnel
requires a 3-kW electric motor to deliver 360
m³/min at a static pressure of 300 mm of water
when operated at a speed of 500 rpm. It was later
found that the air to be delivered needs to be
increased to 420 m³/min. If the fan size remains
constant, account for the pressure in meters of
water.
Assignment No. 3
A manufacturer rates his fan at 11.25 cm of water
static pressure for 170 m³/min of 21°C air, 1,500
rpm, 760 mm Hg barometric pressure, and 71%
static efficiency. What will be the flow, static
pressure, and shaft hp at 1,800 rpm, 93°C, and 660
mm Hg barometric pressure?

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