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Do you have evidence that it is a problem? What is the
temperature differential between the floor and the peak of the
roof? For my house (well insulated and well sealed), I have never
seen more than a 5 degree difference. At that point I would be
wasting more energy running a fan, than I would gain.<br>
<br>
The math looks like (for my situation): 16 by 8 triangle peak, 32
feet long = 2048 ft^3 of air space * 0.018 BTU/ft^3-degree = 37
BTU / degree * 5 degrees delta = 184 BTUs. With a 100 cfm fan we
move that every 20 minutes. If the heat magically regenerates, we
are still only getting 553 BTUs/hour. A 100 cfm fan might use 100
Watts or 341 BTUs per hour to do that work (plus transmission
losses). <br>
<br>
This would increase the average temperature of the AIR (only) in
the house by 0.6 degrees. Including thermal mass would make it
unnoticeable.<br>
<br>
<br>
Thank You Kindly,<br>
<br>
Corwyn / Topher Belknap<br>
<br>
<br>
On 10/23/2013 9:33 AM, Sacie Lambertson wrote:<br>
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<blockquote
cite="mid:CAM6L0t5AnZikdCOkDRN60pPvJ7oL3fsuHOmjsgaMPPDaA6jx9A@mail.gmail.com"
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<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small">All,
currently in Vermont; staying in a lovely house with a big
30'x30', tall 25'+ living room converted from a barn. In
addition to a radiant heated concrete floor, a new pellet
stove that blows heat into the space has recently been
installed. About a third of the room is divided by a loft
space that forms an extension to the larger room underneath
and a bed room above. The very high ceiling for the entire
space is contiguous.<br>
<br>
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<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small">How to
bring the rising warm air down to the occupied space below?<br>
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<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small">
<br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small">The
space is well insulated but at the same time it has many
windows, at least ten. It would not be practical nor would it
look good to install a beam across the space from which a fan
could be hung. I don't think one can hang a large fan on what
would have to be at least a 15 foot single pole.<br>
<br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small">Ideas/suggestions/solutions
for a good way to distribute the warm air would be
appreciated. When winter hits this part of the world, the
bedroom space will be overly warm while those sitting below
will be uncomfortably cold.<br>
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<br>
<br>
<pre class="moz-signature" cols="72">--
Topher Belknap
Green Fret Consulting
Kermit didn't know the half of it...
<a class="moz-txt-link-freetext" href="http://www.GreenFret.com/">http://www.GreenFret.com/</a>
<a class="moz-txt-link-abbreviated" href="mailto:topher@greenfret.com">topher@greenfret.com</a>
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