How does an electric fan give a cooling effect on a hot day?

Answer 1

On a hot day, the room temperature (T=34 deg C) is reasonably high, so that both the processes of loss of heat by body (T=37 deg C) to ambient through natural convection (air is a poor conductor) and radiation are minimal. As a result, heat generated within the body gets blocked and that causes discomfort.

At such a juncture, the drier wind, circulated by fan around the body, initiates forced convection and starts evaporating the tiny droplets of sweat formed on the body contours. This evaporation, liquid water changing into vapors, takes place at the constant temperature, wherein phase change is taking place. The process forces the body to supply the latent heat of vaporisation. Thus, outer surface of body, upon immediate loss of huge heat, cools perceptibly. > Comfort is achieved

Answer 2

an electic fan could just mix the air. so if we are in a hot day the air is also hot.... a person can easily answer that an electric fan could not produce cool air. in the other hand an electic fan uses electric energy and produses kinetic energy in order to spin the whell. so a part o the kinetic energy will became thermic energy so that the fan makes the air warmer......!!!!!!!!
it seems to be strainge how a fan can give a cooling effect on a hot day....but the answer is that when a day is hot litlle drops of water came out of our scin. these drops can became vapor when the air is hot enough and also when the air that is close to the drops have very few vapor water. so when the fan works it send new air with few vapon water over our scen. when a drop of water became vapor ''steals'' thermic energy from our scin!
so we fell that its cooling!!!!

Answer 3

Ordinarily, the air around our bodies moves or circulates very slowly, to the extent that we are mostly unaware of its existence, except on breezy days when its cooling effect is noticed. An electric fan generates streams of air which are directed towards our bodies. By so doing, the air streams act as a sort of heat-exchanger, replacing the hot air around our bodies with a cooler one from the surrounding. This sort of arrangement works well as long as the air temperature itself is not excessively high. At temperatures in excess of 40 deg C for example, one might find it better not to use a fan at all, since the air blown on you by the fan is itself uncomfortably hot.

Answer 4

Wind Chill Factor. That and it helps the sweat evaporate off you faster causing a cooling effect.

Answer 5

Evaporation of water is hastened by movement of surrounding air.
when an electric fan is switched on, it gives a blast of air.
this air movement increases the rate of evaporation of sweat from our body.
The sweat absorbs heat from our body to evaporate, thus giving us a cooling effect.

Answer 6

By circulating the air around us causing us to loose body heat, the faster the air around our body is circulated the greater the heat loss.