When I’m sweating away on a Wattbike, the fan I use helps evaporate the sweat from my skin. Evaporation is endothermic, removing heat from the body. So I hate to break it to you, the fan keeps me cool(er), lowering my body temperature.🤔
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And even if you're not sweating, all surfaces have an insulating boundary layer of air. Remove that layer and the surface approaches ambient. For people, the boundary layer is particularly thick around their head. A fan blowing on your face, head, neck definitely cools you unless ambient is over 95F
aug 4, 2025, 10:09 pm • 14 0 • view
This is why fans are useful for cooling cars and computers etc., which typically don’t sweat at all
aug 5, 2025, 4:44 am • 1 0 • view
✔️
aug 5, 2025, 1:07 pm • 0 0 • view
Endo- or Exo- ?
aug 9, 2025, 2:55 pm • 0 0 • view
I think it depends on perspective; endothermic from the perspective of your body, as evaporation requires & consumes heat & therefore cools the skin & body. From the perspective of surrounding air, exothermic, as the surrounding air is heated as a result. 🤷♂️
aug 9, 2025, 8:34 pm • 0 0 • view
Yup, just came to say that—if you are sweating how would a fan not cool you down?
aug 4, 2025, 9:44 pm • 37 0 • view
There is also a layer of insulation formed by the evaporated moisture. It keeps your body insulated and prevents heat loss, keeping you hot. Wind removes that layer of insulation. We ALL feel it. Yes, blankets negate that, but the general idea that fans don’t help you cool off is ridiculous.
aug 4, 2025, 10:27 pm • 4 0 • view
Yeah been on a bike and having fan on is one best examples of how it actually does work
aug 4, 2025, 10:06 pm • 1 0 • view
If you read the article, you come to this conclusion: "The actual story is that fans cool you down if you can sweat; old people sweat less so fans don’t cool them down. By making them more comfortable, fans actually make old people more susceptible to heat exhaustion. "
aug 4, 2025, 10:11 pm • 15 0 • view
They mention wetting yourself in the first paragraph of the article. Sweat is wet. Do they covered that. What they are talking about is a dry heat or not sweating enough. Often ppl with heat strokes stop sweating.
aug 5, 2025, 12:02 am • 2 0 • view