8) Table Fan

TABLE FAN

A fan is a machine used to create flow within a fluid, typically a gas such as air.The fan consists of a rotating arrangement of vanes or blades which act on the fluid. 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. Fans are necessary in most of all applications which include heat rejection process. The radiator fan for example removes heat from the cross flow heat exchanger. 

"The word fan comes from Middle English, winnowing fan, from Old English fann and from Latin vannus".

The Motor in fan is supplied with power which turns the rotor connected with blades. The rotation of the blades causes the change in kinetic energy of fluid. There are many types of fan :

1) Axial fan

2) Centrifugal fan

3) Cross flow fan

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.

MODELED BY AMAL NAMBIAR

MODELED IN CREO AND RENDERED IN KEYSHOT

FAN FACTS :

• Although fans move air, they don’t actually change the temperature of the air. Just like a breeze outside on a hot day – ceiling fans move air in a way that helps people feel cooler.

• The punkah fan was used in India about 500 BCE. It was a handheld fan made from bamboo strips or other plant fibre, that could be rotated or fanned to move air. 
• Between the years 1882 and 1886, New Orleans, LA resident Schuyler Skaats Wheeler invented a fan powered by electricity