I only had about another 45 minutes before I had to leave last night. So, in just under 2 hours of blowing the attic air down, it brought the temp up from 68.5 to around 71.5. Not too shabby if I do say so. Well worth looking into IF the temperature gets high enough in winter.
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I did this again last night. I wasn't very sunny yesterday, but the attic was still 72 and the upstairs was 66. So, I wanted to see what a 6 degree difference would do to me. ~2 hrs later the upstairs was 67.5 and attic was ~70. With so little temperature differential I didn't think there was much benefit, but I was happy to see the temp go up 1.5 degrees.
So, going forward I'm thinking of improving the setup. I think the next easy step would be to move the fan into the attic and set it on top of the cutoff chimney. I recently bought a remote outlet control for another project, but I'm thinking it would be perfect here for manual control. When I notice its warm up there, I flick it on and have warm air blowing down into my kitchen. Of course I'll need to unblock the previously blocked hole. Ideas, thoughts? |
Is there an all-season attic-vent-fan product on the market with bi-directional fans,
that's insulated, with a flap that shuts during winter nights.?. It would be nice to clear out indoor hot air in the summer and suck down warm air on days like this.. |
Sorry, I haven't responded to a bunch of posts here.
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There is insulation above the door when its all closed up. |
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Anyone have any ideas on what products could be used like this? I'd imagine a bi-directional flapper door wouldn't be the easiest thing to come by. |
It's 70 outdoors, 72 in my PC room right now (good solar), 66 in the basement and about 89 in the attic.
I have the pull-down door open about 8", so it doesn't get real hot up there.. Mainly, I want fresh dry air circulating in the basement. (for now). When that pull-down door is sealed in the winter, it gets pretty warm up there.. Sun hitting any part of the roof will help keep the snow melting.. From the peak down. I think my summer setup is okay, but I'll have to see if I can use some of that attic heat for winter space heating. |
Use an arduino or other microprocessor: When the attic is greater than 72 degrees and the house is less than 70 degrees, turn the fan on.
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Yeah, thats probably the way I'll go eventually if all the manual testing works out.
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So, I checked my chimney the other day. The opening is actually about half the size of my box fan. So, I'm thinking it would be a good idea to find some other fan for it. So, I'd imagine a squirrel cage fan would probably work better for this application since they're normally used for hvac stuff. I'm guessing because of their ability to create a higher pressure differential? Does anyone have any suggestions?
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If you're going to use a squirrel cage fan, you can run it down the chimney since the discharge area is typically a lot smaller than a box fan. And it does produce a higher pressure differential than an axial fan.
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