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DJman

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Posts: 19
Reply with quote  #1 
Hello all again.

It's been 3 years since I posted here https://simplysolar.supporttopics.com/post/new-to-hot-air-systembuild-questions-7077368?trail=10

but after the conversation we had there I decided  not to go with solar hot air then.

Now I want to rethink that, with your help.

My house see's sun only in the roof because I have big trees near the house.And the only way to drive the air ducts to the house is the fireplace chimney.(which we do not use)

Is it going to work if I build a 6x2 foot collector (I already have this size glass and wood panels) and drive the 40 foot air duct in to the house(the first 10 foots will be on the outside and the rest on the chimney)

stmbtwle

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Reply with quote  #2 
A 2x6 collector isn't very big and you're going to lose a lot in a 40' duct (and then there's the return run to be considered too).  Others may disagree but my personal opinion is it isn't going to be worth the effort. 

If you can make a MUCH bigger collector it might work.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gbwillson

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Reply with quote  #3 
DJman-

I was thinking the collector was far too small for anything but a very small room as well. And unless you seal your 40' duct run well, any energy savings might well go up the chimney.(Sorry, I couldn't help myself) Willie suggested making a collector much larger, which I think is the right thing to do if you plan to use this to heat the lowest floor. But if you do go big, say 64sf or larger, you have to move a lot of air, which means using larger ducts. You'll need to fit two insulated ducts inside the chimney, and 4" ducts would be far too small. Moving air through 40' of ducting isn't much of a problem. One of my collectors has a total duct run of about 35'+ with no problems.

In any case, building a larger collector isn't any harder than a small one, it just costs more in materials. But if you are going to go through the trouble of the building and ducting, you might as well make it worth the time and effort. And being on the roof you will either have to haul it up on the roof, or build it up there. 

Greg in MN
SolarInterested

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Reply with quote  #4 
In reviewing your first thread (link) you had decided to switch over to a hydronic system. All the same arguments still apply.

Hot water will flow downhill with much smaller piping.

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stmbtwle

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Reply with quote  #5 
A water line would be easier to insulate, too.  Look into an ARETHA. Almost as easy to build as a hot air collector, definitely easier (and probably cheaper) than a water-tube collector.


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
DJman

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Posts: 19
Reply with quote  #6 
Thank you all (AGAIN) for your info and support. A water line I think is the must go.
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