2007-07-03 23:41:36 · 19 answers · asked by Silkie1 4 in Science & Mathematics ➔ Physics
Yes they do!
The heat generated due to the friction within the motor is marginal. Practically- we can forget this source of heat.
The heat generated due to the friction of fan blades on air is also insignificant. Ignore this as well.
The hot air always has low density and thereby goes up to the roof of the room. When the room temperature raises due to the atmospheric heat the hot air always will be near the roof.
If the fan used is a sealing type (roof mounted) then this just blow the hot air present at the top portion of the room to the bottom and adds the "experience of hot desert wind".
On the other hand if the fan is a table top model and kept near a window it will blow in a compratively cool air.
2007-07-04 01:21:59 · answer #1 · answered by <B-NOY><% 2 · 0⤊ 0⤋
The fans' motors generate heat. There is a net influx of heat converted from electricity into the system.
I remember an old tale of an owner of a bar in the Virgin Islands. Every morning the owner would receive a block of ice, and would lug it over to a shelf below the window, He would drape a clean towel over it, and for the entire business day, a pair of big fans would blow outside air over the ice block, providing cooled air to the customers. The towel provided a "wicking" action to improve evaporation. The water drained into a pan with a hose to the outside.
2007-07-04 03:58:57 · answer #2 · answered by science_joe_2000 4 · 0⤊ 0⤋
Best thing to do on a hot day is take a plastic bottle and fill it with water, place it in front of the fan and whilst the fan is on and the water defrosting, it will spread some nice cooling evaporated air into the room.
2007-07-03 23:46:51 · answer #3 · answered by politicsguy 5 · 1⤊ 0⤋
No.
The cooling effect you feel from a fan comes from the forced air movement causing the sweat on your skin to evaporate quicker. It's mostly the evaporation of the sweat that cools your skin and makes you feel cooler, however there is some forced cooling by direct heat transfer to the air (heat energy can only transfer to something cooler than the source.)
A fan's motor could cause a slight temperature rise in the room, but only if its temperature is higher than the temperature of the surrounding air.
2007-07-05 01:07:52 · answer #4 · answered by Timbo 3 · 0⤊ 0⤋
Yes, due to the heat of the motor and the friction between the air and the fan blades, but that is more than off-set by the cooling effect of the air flowing around us and removing the body heat through dispersion and evaporative cooling of the sweat.
2007-07-03 23:54:39 · answer #5 · answered by Swamy 7 · 0⤊ 0⤋
They could actually warm it up a little but the moving air helps evaporate the perspiration which cools you off more than the fans would heat it up.
2007-07-03 23:50:55 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Yes fans produce small amounts of heat in two ways, firstly by friction in the air and secondly because their motors also generate heat.
A fan cools you though by circulating the air and accelerating perspiration thus cooling your body.
2007-07-04 00:00:57 · answer #7 · answered by DAW 1 · 1⤊ 0⤋
They move air around, giving the illusion of cooling us off. However, the "cooling" in fact, comes from our own bodies' sweat production. The sweat is a reaction to the heat generated by the moving air.
2007-07-04 07:56:35 · answer #8 · answered by peskylisa 5 · 0⤊ 0⤋
id say they just move the hot air around the room
2007-07-03 23:52:24 · answer #9 · answered by Anonymous · 0⤊ 0⤋
No I think they just circulate the warm air
2007-07-03 23:55:00 · answer #10 · answered by K8 3 · 0⤊ 0⤋