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Time：2022-04-21Views：0
Mechanical fans originated in 1830. An American named James Byron was inspired by the structure of clocks and invented a mechanical fan that could be fixed on the ceiling and driven by a clockwork. The cool breeze brought by the rotating fan blades of this kind of fan makes people feel cool, but it is very troublesome to climb the ladder to wind up.
In 1872, a Frenchman named Joseph developed a mechanical fan started by a clockwork turbine and driven by a gear chain device. This fan is much more refined and easier to use than the mechanical fan invented by Byron.
In 1880, American Shule first installed the blades directly on the motor, and then connected it to the power supply. The blades turned rapidly, and gusts of cool wind came blowing. This was the world's first electric fan.
When the electric fan is working (assuming there is no heat transfer between the room and the outside world), the temperature in the room does not drop, but rises. Let's analyze the reason for the temperature increase: when the electric fan is working, since there is current passing through the coil of the electric fan, the wire has resistance, so it will inevitably generate heat and release heat to the outside, and the temperature will naturally rise. But why do people feel cool? Because there is a lot of sweat on the surface of the human body, when the electric fan works, the air in the room will flow, so it can promote the rapid evaporation of sweat, combined with "evaporation needs to absorb a lot of heat", so people will feel cool.
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