[Greenbuilding] Speed of ceiling fan

Sacie Lambertson sacie.lambertson at gmail.com
Wed Aug 31 12:53:49 CDT 2011


Thanks Joe,  here in NE KS our humidity can be pretty high too and the nice
breezes we get much of the time do indeed make a whale of a difference.

I continue to be interested in the velocity of the average ceiling fan,
however show it may be.

Sacie

On Wed, Aug 31, 2011 at 9:44 AM, Joe Killian <kaa-ajk at sonic.net> wrote:

> **
>   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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