Electric fan | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-19

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Fan_(machine)


00:02:07 1 History
00:04:11 1.1 Steam
00:05:07 1.2 Electrical
00:07:55 2 Types
00:09:20 2.1 Axial-flow
00:13:02 2.2 Centrifugal
00:14:06 2.3 Cross-flow fan
00:18:15 2.4 Bladeless Indirect viscous-shear fan
00:19:16 3 Uncommon types of fans
00:19:26 3.1 Bellows
00:21:19 3.2 Coandă effect
00:22:25 3.3 Convective
00:23:49 3.4 Electrostatic
00:24:34 4 Noise
00:24:59 5 Fan motor drive methods
00:27:03 6 Solar powered fan
00:28:25 7 See also



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SUMMARY
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A fan is a powered machine used to create flow within a fluid, typically a gas such as air.
A fan consists of a rotating arrangement of vanes or blades which act on the air. The rotating assembly of blades and hub is known as an impeller, a rotor, or a runner. Usually, it is contained within some form of housing or case. This may direct the airflow or increase safety by preventing objects from contacting the fan blades. Most fans are powered by electric motors, but other sources of power may be used, including hydraulic motors, handcranks, internal combustion engines, and solar power.
Mechanically, a fan can be any revolving vane or vanes used for producing currents of air. Fans produce air flows with high volume and low pressure (although higher than ambient pressure), as opposed to compressors which produce high pressures at a comparatively low volume. A fan blade will often rotate when exposed to an air fluid stream, and devices that take advantage of this, such as anemometers and wind turbines, often have designs similar to that of a fan.

Typical applications include climate control and personal thermal comfort (e.g., an electric table or floor fan), vehicle engine cooling systems (e.g., in front of a radiator), machinery cooling systems (e.g., inside computers and audio power amplifiers), ventilation, fume extraction, winnowing (e.g., separating chaff of cereal grains), removing dust (e.g. sucking as in a vacuum cleaner), drying (usually in combination with a heat source) and to provide draft for a fire.
While fans are often used to cool people, they do not actually cool air (if anything, electric fans warm it slightly due to the warming of their motors), but work by evaporative cooling of sweat and increased heat convection into the surrounding air due to the airflow from the fans. Thus, fans may become ineffective at cooling the body if the surrounding air is near body temperature and contains high humidity. During periods of very high heat and humidity, governments actually advise against the use of fans.