passive solar sanity check [RE-wrenches]

Bill Brooks bill at brooksolar.com
Tue May 17 10:11:02 PDT 2005


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Kurt,

You should check out the fact sheets at North Carolina Solar Center (my old
stomping grounds) www.ncsc.ncsu.edu. From their passive solar design
checklist:

--Size south-facing windows and thermal mass
appropriately.
--Suntempered homes with no internal solar thermal
mass should have south facing windows with a glass
area of no more than 7 percent of the floor area .
--Direct gain systems can have south-facing window
glass area which is 7-12 percent of the floor
area. Every 1 square foot of south-facing glass over
the 7 percent suntempering allowance must be accompanied
by 5-6 square feet of 4-inch-thick masonry.

Bill.

-----Original Message-----
From: Kurt Albershardt [mailto:info at es-ee.com] 
Sent: Monday, May 16, 2005 8:24 PM
To: RE-wrenches at topica.com
Subject: passive solar sanity check [RE-wrenches]


I've got a client with a project located in north central California and
with decent southern exposure.  Her architect (who lacks both the software
and the experience to do overhang calculations) and her contractor are
telling her that it's probably not worth increasing the window area on the
south face because of increased nighttime heat losses.  These are the same
people who put a 7 foot overhang on the south windows.

Is there some simple formula to help sort this out, or at least a guideline
that will show the effects of increasing window area with different
U-values?  The architect is donating his time to a nonprofit and the budget
just isn't there to pay for a professional study, unless she can show them
something to change their minds.


--TIA

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