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Peter,<br>
<br>
I think this is a very unwise way to model complex fenestration,
because you'll be using the Simple Window Model in DOE-2, which
assumes that the angular<br>
variation of SHGC and temperature variation of U-factor are the same
as for single-pane clear glass. I haven't followed the development
of LBNL's Window (not Windows :-)) program for the past five years,
but the program used to produce a text "WINDOW 4" file that can be
read into DOE-2 or eQUEST. If this is still possible, I would
recommend using that method. There are still the questions of
venetian blind shading that is not dependent only on the angle of
incidence, but also the azimuth relative to the blinds (there must
be a technical term for this, but I don't know that off the cuff),
and if you want to change the angle of the venetian blinds depending
on season. I can think of ways of dealing with these issues, but it
would require writing a USER FUNCTION, which I don't think has been
implemented in DOE-2.2.<br>
<br>
Joe <br>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.whiteboxtechnologies.com">www.whiteboxtechnologies.com</a>
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<br>
On 12/22/2012 5:51 PM, Peter Baumstark wrote:
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cite="mid:1356227493.86472.YahooMailRC@web181505.mail.ne1.yahoo.com"
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<div>Ok. . . I have a situation where I'm modeling a facility
relative to ASHRAE 90.1 baseline. The customer is using dual
pane, low-e windows, with integrated venetian blinds between
the two panes of glass. One pane is low-e and the other is
clear. Air gap between the two (not Argon or anything like
that).<br>
<br>
I use the LBNL Windows tool, with blinds set at 45 deg, and
the blinds increase the window assembly U value and SHGC
significantly.<br>
<br>
So for performance relative to 90.1, would it be acceptable to
simply utilize the U & SHGC from with Windows tool? Are
there any restrictions on the angle of the blinds, or whether
the angle should be different for winter vs summer?<br>
<br>
I'd appreciate any guidance on how to best model this
scenario.<br>
<br>
Thank you,<br>
Pete Baumstark<br>
San Jose, CA<br>
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