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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’ve had some looks, nothing too deep, but I don’t
think I’ve ever seen a reference to edge-of-glass (EOG) performance, only
COG and frame conductance… And I would also guess that when looking at
COG values of U-0.3 (typical double pane low-E) and frame value U-1 (TB aluminum)
that the edge of glass performance is not that good and would noticeably affect
building energy use. <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'>I don’t know of any way of taking this into account. One
option would be to figure out the area-weighted average conductance of the COG
and EOG (1 U-factor that takes both components into account), the problem is
that in order to input that into eQUEST, you would need to do it as a “simplified
input” which I know people on this list-serv dislike doing.<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'>I can’t think of another way to account for EOG
performance.<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'>Alex <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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Carol
Gardner<br>
<b>Sent:</b> Thursday, September 16, 2010 4:21 PM<br>
<b>To:</b> STEVE SAMENSKI<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Modeling Windows: Center of Glass vs
Assembly<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Happy reading. I'm not sure
exactly how eQUEST handles all of this but I would assume, oooh, dangerous,
that if you put in your glass type carefully and take care to specify the width
and type of frame you have, all of which are in the Wizards, you should be
good. You could test the output by comparing it to a Win5 calculation of your
COG U value and frame, or just import the Win5 data into the model.<br>
<br>
Carol<o:p></o:p></p>
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<p class=MsoNormal>On Thu, Sep 16, 2010 at 2:38 PM, STEVE SAMENSKI <<a
href="mailto:steve@thespinnakergroupinc.com">steve@thespinnakergroupinc.com</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Arial","sans-serif"'>Does
anyone know definitively if eQuest calculates window assembly U-values based on
user input?<br>
<br>
As many have pointed out, the USGBC is now being careful about the distinction
between center-of-glass U values and assembly U values. I’ve been
entering center-of-glass U-values and precise window geometry, counting on
eQuest to do the heavy lifting for me. Report LV-D says “U-VALUE
INCLUDES OUTSIDE AIR FILM; WINDOW INCLUDES FRAME, IF DEFINED”. However,
combing through several posts to this forum, some say eQuest doesn’t
really calculate an assembly’s U-value, because it ignores the
edge-of-glass effects due to the frame. (Not to be confused with the
thermal conductance of the frame itself, which I’m sure eQuest uses in
its calcs.) I’m hoping that one of the programmers can answer this,
or maybe someone who got the story from a programmer.<br>
<br>
I plan to read the ASHRAE Fundamentals Chapter on Fenestration this weekend.
Wish me luck.<br>
</span><span style='font-size:9.0pt;font-family:"Verdana","sans-serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Steve Samenski, PE, LEED AP, BEMP<br>
Vice President - Sustainable Technologies<br>
The Spinnaker Group, Inc.<br>
<a href="http://equest-diary.livejournal.com/" target="_blank">http://equest-diary.livejournal.com/</a><br>
<a href="http://www.thespinnakergroupinc.com" target="_blank">www.thespinnakergroupinc.com</a>
<</span><u><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'><a href="http://www.thespinnakergroupinc.com" target="_blank">http://www.thespinnakergroupinc.com</a></span></u><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>> <br>
</span><b><i><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#76923C'>Become the solution... Join the USGBC!</span></i></b><o:p></o:p></p>
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<p class=MsoNormal><br>
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<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
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