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The Fan is electronic cooling machine. This is usually fixed on wall and mostly available in three or four plates. This is good alternative of air conditioning. But where the temperature is goes high this machine is not much useful in comparison of another cooling machine. A fan is a device used to induce airflow and generally made from broad, flat surfaces which revolve or oscillate.
Generally three types of fan are available such as:
• Table fan: A table fan generally rest on a table and also movable means to say that we can put it anywhere in a room according to our desired. a table is also change the direction automatically flowing air in whole room .table fan also available according to the room size.
• Ceiling fan: A fan suspended from the ceiling of a room is a ceiling fan. For in-depth discussion of ceiling fans.
• Solar powered fan: Electric fans used for ventilation may be powered by solar panels instead of mains current. This is an attractive option because once the capital costs of the solar panel have been covered, the resulting electricity is free. In addition, electricity is always available when the sun is shining and the fan needs to run.
Fans produce air flows with high volume and low pressure. Fans are also useful for providing large quantities of air in any direction; The Fans are also suited for many applications such as winnowing grain or blowing a fire, cooling and ventilation purposes, and in conjunction with a heat source for heating and drying. A fan blade will often rotate when exposed to an air stream, and devices that take advantage of this, such as anemometers and wind turbines often have designs similar to that of a fan.
Table fan include the fan blade, base, armature and lead wires, motor, blade guard, motor housing, oscillator gearbox, and oscillator shaft. The oscillator is a type of mechanism that motions the fan plate from side to side. The axle comes out on both ends of the motor, one end of the axle is attached to the blade and the other is attached to the oscillator gearbox. The motor case joins to the gearbox to contain the rotor and stator. The oscillator shaft combines to the weighted base and the gearbox. A motor housing covers the oscillator mechanism. The blade guard joins to the motor case for safety.
There are various applications of fan which include ornamental decorations, temperature control, cooling purpose, personal wind-generation, ventilation, winnowing removing dust drying and to provide draft for a fire and also for dryer purpose.
So we can say that the fan is not only a cooling machine it is also use for various purpose and nowadays there is no good option of fan.
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