fanpower needed to cool house overnight
For example: 2 story house, 20' x 30' with 8' ceilings. A 16 in. 3 spd
fan from Graingers (~3000 cfm on hi speed) is mounted in the trap door to the attic with a venting window in the attic open. This has proved effective. Having the fan in the attic is responsible for the quick cooling to some degree; hot air tends to rise and a fan pushing out a window moves it less directly. Hul In alt.building.construction Lacustral wrote: I'd 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'm not sure how much CFM is needed. I don't want a big powerful whole house fan because I'd 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'm 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 |
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