At what speed do the fans operate?
Fans are used to circulate air in rooms and buildings; to cool engines and transmissions; to cool and dry people or products; to remove dust and pollutants from the air; to move light materials; for forced draft in steam boilers; and in heating, ventilation, and air conditioning systems.
A fan consists of radial blades mounted on a central rotating hub. The rotating assembly of blades and hub is known as an impeller; and it may or may not be enclosed in a main body. Fans may be driven by an electric motor, an internal combustion engine, a steam turbine, a gas turbine, or other motive power.
Closed fans can be classified as centrifugal or axial fans.
With centrifugal fans, air is drawn through an inlet pipe into the center of the impeller, or eye, which forces it radially outward into a coil, or spiral casing, from which it flows toward the discharge pipe.
In an axial fan, the air rotates essentially without changing its distance from the axis of rotation. There is no centrifugal effect. The guide vanes, or stator blades, serve to streamline the airflow and improve efficiency.
In general, an axial fan is suitable for relatively large flow rates with relatively small pressure gain, while a centrifugal fan is suitable for small flow rates and large pressure gain.
In reality, the pressure in the fan is small compared to the pressure developed in the compressor. The capacity of the fans ranges from 100 to 500,000 cubic meters per minute (3 to 14,000 cubic meters per minute).
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