|
Lacustral wrote:
> I would like to use an exhaust fan (fan from a ceiling grille to outside) to
> run overnight in the summer, with the windows open, so that my house is cool
> in the morning. I am not sure how much CFM is needed. I do not want a big
> powerful whole house fan because I would like it to be quiet. Just a small
> fan that keeps running overnight.
>
> If you're using a fan for that purpose, can you tell me how much CFM gets
> your house down to the temperature of the outside air, and how many cubic
> feet of airspace you're ventilating, and how long does it take to cool
> the house down to the outside temperature?
>
> Just trying to get a ballpark idea.
>
> (I could calculate the cubic feet of airspace in my house, divide by CFM
> of a fan, and come up with a guess, but I am sure it's not that simple -
> the hot stuff in the house is heating up the air, fans aren't completely
> efficient about clearing out the inside air, etc.)
>
> Thanks
> Laura
Like some of the other comments regarding exchanging air not affecting
the overall temperature of the house, I'd also add that a simple
fresh air exchanger won't do the trick either. We have a very good
system tied into our regular household ductwork (a $2,000 RUUD system
not to control air temp as much as humidity and getting fresh air into
our 'super tight' panelhome). Running the furnace fan 100% and the
fresh air exchanger on high over night with the outside temp in the low
60's doesn't bring the air temp in the home down a degree. The heat
build up in the structure itself does not dissipate easily.
Mike
http://home.earthlink.net/~mikefrandson/NewHouseRelease.htm
|
|
Re: fanpower needed to cool house overnight
