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fanpower needed to cool house overnight
-- Phil Scott Ideas are bullet proof. "Lacustral" wrote in message ... 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.) One air change an hour would do it... 3 air changes an hour would do it by midnight. so if the house is 1500 sq ft with an 8' ceiling the volume is maybe 12,000 cubic feet...divide by 60 to get CFM for one air change..thats 200 cfm... a very small fan, you can do a well by leaving a few windows open... 600 cfm is more like it, most attic fans will fit that bill. you could mount it on the room and fit a vent though a hallway ceiling so it pulls the house air out first, then the attic air cooling both of those spaces. Phil Scott Thanks Laura |
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