![]() Instead, a stream of running water was used, in conjunction with a turbine, to drive a system of belts which would turn the blades of two-blade fan units. At that time, they were not powered by any form of electric motor. The first rotary ceiling fans appeared in the early 1860s and 1870s in the United States. In comparison to a rotating fan, it creates a gentle breeze rather than an airflow.Ĭeiling fan originally installed in the dining room of the house in Perry's Camp, turned by the water wheel Originally operated manually by a cord and nowadays powered electrically using a belt-driven system, these punkahs move air by going to and fro. These were cut from an Indian palmyra leaf which forms its rather large blade, moving slowly in a pendular manner. Punkah style ceiling fans are based on the earliest form of a fan, which was first invented in India around 500 BC. Many ceiling fan units also double as light fixtures, eliminating the need for separate overhead lights in a room. This can affect both thermostat readings and occupants' comfort, thereby improving the energy efficiency of climate control. In the winter, fans move warmer air, which naturally rises, back down to occupants. Fans use significantly less power than air conditioning as cooling air is thermodynamically expensive. Fans add a small amount of heat to the room mainly due to waste heat from the motor, and partially due to friction. Fans do not reduce air temperature or relative humidity, unlike air-conditioning equipment but create a cooling effect by helping to evaporate sweat and increase heat exchange via convection. ![]() They cool people effectively by increasing air speed. A ceiling fan is a fan mounted on the ceiling of a room or space, usually electrically powered, that uses hub-mounted rotating blades to circulate air. ![]()
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