It feels almost intuitive that the moving air would help keep you cool. After all, that's what a breeze does and, in a pinch, waving a folder in front of your face on a hot day will provide a little relief.
But since temperature is a feature of the molecular properties of a substance, the air itself isn't made any cooler by movement—it just makes us feel cooler when it blows by.
On a hot day—or on a not so hot day if it's "wind chill" you're talking about—moving air helps your body with the cooling off process. Humans lose heat —a necessity for thermoregulation—through conduction, radiation, convection, and evaporation. Instead, the fan cools the occupants in it. The breeze from a properly sized and placed ceiling fan cools occupants by disrupting the stagnant layer of air that surrounds the body, preventing heat loss. Heat loss cooling can come in two forms: cool air passing over the skin removes heat via convection and relatively dry air passing over the skin increases the rate of perspiration evaporation.
Learn more about evaporative cooling. Because a ceiling fan cools occupants but not spaces, it makes sense to turn off a fan in an empty room, unless air circulation is required for reasons other than comfort. They do this by relying on size rather than speed. While spinning at a low speed the in to ft diameter fans move large amounts of air, efficiently providing that cooling breeze.
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