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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Is there a library of baseline windows available? Perhaps one
that may compare a performance window to an ASHRAE standard. This sounds like
something that would be very useful. Instead of using inaccurate baseline
models for government incentive programs and LEED certifications. <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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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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"'> D. Charlie Curcija
[mailto:curcija@ecs.umass.edu] <br>
<b>Sent:</b> Wednesday, April 25, 2007 9:22 AM<br>
<b>To:</b> kkyte@robsonwoese.com; BLDG-SIM@gard.com<br>
<b>Subject:</b> RE: [BLDG-SIM] Simplied windows and glass libraries<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:blue'>Kevin,</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:blue'>The
best way to accurately model windows is with WINDOW and THERM software
(windows.lbl.gov). These tools are also used for NFRC (National
Fenestration Rating Council) certifications. However, you will need all
of the details of frame and glazing design to be able to utilize these
tools. WINDOW program is used to model glazing system and THERM program
is used to model frame and edge of glass sections. The whole product is
then assembled again in WINDOW program, so WINDOW has dual role. While
WINDOW program is easy to learn and can be accomplished in half a day, THERM
program requires 2-3 days of training for novice users. Several
companies offer training and our company (<a
href="http://www.designbuildersoftware.com">www.designbuildersoftware.com</a>)
is one of them. WINDOW program creates DOE2 report file, which can be
used with DOE 2.2 to assign windows. That provides the most accurate way
to model windows energy performance in a building.</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:blue'>If
you don't have all of the details and wish to get estimated performance, you
can use one of the predefined windows in DOE 2.2, closest to what you
have. You should not use simplified way (i.e., by assigning simple
U-factor, SHGC and VT as single number), because that produces gross
errors. EnergyPlus program, which is newer generation energy
simulation engine from DOE does not even have an option to specify windows and
doors that way. You have to have WINDOW EnergyPlus report file
(equivalent to DOE2 report file) or use one of predefined windows in
EnergyPlus. Our tool DesignBuilder uses EnergyPlus simulation engine, so
you can try it out.</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:blue'>If
you have further questions, you can contact us directly.</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:blue'>Regards,</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:blue'>Charlie
Curcija</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
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<p class=MsoNormal style='margin-bottom:12.0pt'><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@gard.com
[mailto:BLDG-SIM@gard.com] <b>On Behalf Of </b>Kevin J. Kyte<br>
<b>Sent:</b> Tuesday, April 24, 2007 11:05 AM<br>
<b>To:</b> BLDG-SIM@gard.com<br>
<b>Subject:</b> [BLDG-SIM] Simplied windows and glass libraries</span><o:p></o:p></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'>Can
anyone offer advice on the most accurate route to model window performance?<o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'>There
are discrepancies between modeling glazing from doe library and then modeling
those values in simplified mode.<o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'>Is
this steady state vs. transient heat transfer? I am not familiar and I could
use a lesson in thermo.<o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'>Is
this discussed in the Engineer’s Manual? How about if I used Window5? Will I
be able to import Window files into Doe2.2?<o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'> <o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'> <o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'> <o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'>I
would be grateful of any assistance.<o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle22><span style='font-size:10.0pt'> <o:p></o:p></span></span></p>
<p class=MsoAutoSig><span
class=EmailStyle22><span style='font-size:10.0pt'>Kevin</span></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:.5in;margin-bottom:
12.0pt;margin-left:1.0in'><span
style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:.5in;margin-bottom:
0in;margin-left:1.0in;margin-bottom:.0001pt'><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:black'> </span><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p>
<pre style='margin-left:.5in'><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>==================<o:p></o:p></pre><pre>You received this e-mail because you are subscribed <o:p></o:p></pre><pre>to the BLDG-SIM@GARD.COM mailing list. To unsubscribe <o:p></o:p></pre><pre>from this mailing list send a blank message to <o:p></o:p></pre><pre>BLDG-SIM-UNSUBSCRIBE@GARD.COM<o:p></o:p></pre></div>
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