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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Somebody already pointed out, but to clarify, THERM program does
excellent job at modeling 2-D heat transfer in building envelopes. It was
originally developed for modeling fenestration systems (windows, doors, etc.),
but it can be used for any other façade element, since they are generally
simpler than intricate details of window frames. The benefits of using THERM
are numerous, but to cite few most important ones:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Free with simple registration (don’t be fooled by the fact
that it is free to the public, because substantial funding went into its
development by US DOE)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has automated mesher and error estimator/mesh refinement with no
user intervention (fully automated quality mesh generation)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has powerful drawing capabilities and import from dxf and
scanned drawings<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has extensive library of building materials (users can add their
own, but the built in library is impressive)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has built in correlations for convective heat transfer in
building cavities<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has library of default boundary conditions appropriate for
buildings (user can add their own too)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In addition to 2-D conduction heat transfer model, has detailed
radiation model using grey body radiation enclosure algorithms for both
cavitie4s and indoor/outdoor boundaries<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Calculates U-factors based on indoor-outdoor temperature
difference.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has powerful output capabilities (color flooded plots of
temperatures, heat fluxes, mesh display among other things)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Charlie<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>DesignBuilder Software<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Scott
Schuetter<br>
<b>Sent:</b> Tuesday, January 19, 2010 3:04 PM<br>
<b>To:</b> Josh K<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] FEA heat-transfer analysis of envelope designs<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Josh,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>I don’t have any experience with Elmer or GiD, but I do have
some experience with ANSYS. When we ran into parts with large aspect ratios, we
would try and use 2-D or 1-D elements. The drywall and studs will predominantly
conduct heat in one direction anyways. You can check this with a quick Biot
number calculation. So, if GiD has these type of elements available I would try
using them in concert with your 3-D elements.<o:p></o:p></span></p>
<div>
<p><span style='font-size:10.0pt;color:navy'>Scott Schuetter</span><br>
<span style='font-size:10.0pt;color:navy'>Energy Center of Wisconsin<br>
PH: 608-238-8276 x149<br>
FX: 608-238-0523</span><span style='color:navy'> </span><o:p></o:p></p>
</div>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Josh K
[mailto:jeemang@gmail.com] <br>
<b>Sent:</b> Monday, January 18, 2010 5:53 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] FEA heat-transfer analysis of envelope designs</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi all;<br>
<br>
I'm interested in using FEA to model the heat-transfer characteristics of
several building envelope designs. I'm attempting to use Elmer (<a
href="http://www.csc.fi/english/pages/elmer">http://www.csc.fi/english/pages/elmer</a>)
to do this. Because Elmer doesn't do anything more than very simple mesh
creation, I'm using GiD (<a href="http://gid.cimne.upc.es/">http://gid.cimne.upc.es/</a>)
to attempt to mesh my wall section.<br>
<br>
However, I'm having some serious problems creating a mesh. I'm not overly
experienced in mesh creation, but I have a feeling this stems from the
ridiculous aspect ratio of several parts of the assembly (ie, a 11' x 6' x
5/8" sheet of drywall) and the relatively minuscule thickness
(~1/16") of the steel studs and z-girts that are in the construction.<br>
<br>
I'm wondering if anyone has conducted any such analysis before and could offer
some meshing tips. Alternatively, can anyone recommend a resource I could
consult?<br>
<br>
Many thanks,<br>
<br>
Josh<br clear=all>
<br>
-- <br>
Josh Kjenner, P.Eng., LEED AP<br>
Manasc Isaac Architects Ltd.<br>
10225 100 Avenue :: Edmonton, AB T5J 0A1<br>
780.429.3977<o:p></o:p></p>
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