Fans for electronics
Introduction
A fan is a fluid machine or, more precisely, a device that transmits energy to generate the necessary pressure with which a continuous flow of air is maintained in different parts. It is used for very diverse uses such as: ventilation of environments, cooling of machines or objects or to move gases, mainly air, through a network of ducts. In its most common version, a fan is a device that absorbs mechanical energy and transfers it to a gas, providing it with a pressure increase of no more than 10 kPa "Pascal (unit)") (approximately 1000 mm c. a.), which results in a very small variation in the specific volume and therefore could be considered a hydraulic machine.
The conventional fan consists of a series of rotating blades that act on the air and disperse it in a certain medium.
Generally, the blades/rotor/propeller, essential in fans, are contained within some type of structure or box. This allows them to direct the air in the desired direction and also makes it safer, as it prevents objects from coming into contact with the blades.
History
The oldest fans, of which there is reference, were manual, in principle with a fixed handle, like the flabellum, which appears in Egyptian culture, at least since the 19th dynasty, to later pass on to Ancient Greece, in which it had the shape of a palmette, as it appears in paintings on ceramic vessels. Also from Ancient Rome there are paintings in which slaves are represented handling the flabellum.
Also managed by slaves, but with a certain mechanism, is the "abano", which was a frame with thick fabric that was hung from the ceiling and moved by a system of ropes and pulleys, which the Arabs already used at the beginning of the 7th century. It is also found in India and the Middle East under the name punkah, it was a fan that was hung from the ceiling and covered by a fabric frame, which worked when the servants or “punkawallahs” operated through ropes pulled by the servants or punkawallahs. And they are therefore the first semi-mechanical fans.[1][2][3].
In China, the origin of the rigid fan dates back to , with Emperor Hsiem Yuan"), and the oldest written reference () mentions two feather fans offered to Emperor Tchao Wong"), of the Zhou dynasty.
In 1836, Omar-Rajeen Jumala") created the first mechanical fan, it consisted of large metal or wooden blades driven by water wheels and in principle its use was intended for factories and coal mines. But the similar fan or precursor of the one we know today as such appears in 1886, and is an invention by the American Schuyler Skaats Wheeler, which was marketed by his company Crocker & Wheeler"), installed in New York. It was small in size and designed to be placed on a table. Almost simultaneously, a roof version created by engineer Philip Diehl appeared in Germany").[1][4][3].