[Greenbuilding] Speed of ceiling fan
Joe Killian
kaa-ajk at sonic.net
Wed Aug 31 09:44:02 CDT 2011
Having designed and tested fan cooling for my company's central
office equipment (think telephone & internet), I know that 20 watts will
barely get me to the neighborhood of 200 feet per minute in a small
portion of a guided box. And that's quite a wind. I can't imagine a
ceiling fan getting anywhere close to 200 feet per minute.
Also I would point out that the sensible cooling effect of a
wind/breeze is a very strong function of the humidity - just ask all
those folk who weathered the recent heat waves how much a wind helped
when the humidity was upwards from 90%.
Joe
On 8/31/2011 6:55 AM, Sacie Lambertson wrote:
> John, honing in on that last bit regarding the fan moving at 200 mph
> over a body, what is the speed of a ceiling fan--at the low, middle
> and high speed? Just curious.
>
> We use fans a whole lot in our open high ceiling house, both in the
> summer and in the winter. In the latter case, the ceiling fans seem
> to help distribute heat from a stove source. Last year when there was
> some discussion on this list about the efficacy of this method of
> distribution, I tried unsuccessfully to measure the effects. Surely
> the greater warmth I feel down below is not my imagination?
>
> Thanks, Sacie
>
>
> John wrote:
> /
> A fan, using say 20 Watts blowing air at 200 feet per minute
> over a persons body, would make a house at 80 F feel like it is
> 72F to a person lightly dressed.
> /
> /
> /
>
>
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