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<p class=MsoNormal><span style='color:#1F497D'>Hi Ben,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Vikram makes a good point below –
you should check first check to make sure results and expectations are
reasonable.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Regarding your original
question: in your parametric runs you can set frame width to zero: window/basic
specification/frame width. In that way, when you enter your full frame U-factor
and full frame SHGC (actually I think you need to enter this as SC) you will no
longer have to worry about the U-factor of the base-case frames in your
parametric run. There is a lot of concern about putting in one value for
U-factor and one value for SHGC. So the alternative is what Carol suggested: to
import the window into eQUEST after creating it in WINDOW5 (LBNL’s free
window tool). The problem with that is that I don’t believe that eQUEST
imports frame data. So you would need to import the glass, determine the improved
frame U-factor (probably around U-1.0 for TB aluminum) and set your parametric
run with 2 components: 1 to change the glass, and 2 to change the frame conductance.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Hope this helps!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Alex<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;color:#262F13'>Alex Krickx<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:gray'>Building Energy
Specialist<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;color:#1F497D'><img width=121
height=42 id="Picture_x0020_1" src="cid:image001.jpg@01CB437B.E3F62970"
alt="email_sig"></span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#1F497D'>1250 Elko Dr,
Sunnyvale, CA 94089<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#1F497D'>(t) 408.541.8124<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:gray'><o:p> </o:p></span></p>
<p class=MsoNormal><b><i><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>Warning:</span></i></b><i><span style='font-size:7.5pt;
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to notify us immediately by reply e-mail and delete the original message
immediately.</span></i><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Sami,
Vikram<br>
<b>Sent:</b> Tuesday, August 24, 2010 9:53 AM<br>
<b>To:</b> Ben Pressman; equest-users@lists.onebuilding.org<br>
<b>Cc:</b> Justin Murray<br>
<b>Subject:</b> Re: [Equest-users] window replacement<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoPlainText>Ben,<o:p></o:p></p>
<p class=MsoPlainText>I would first go back to your base model and examine what
percentage of the building load is actually coming from the glass. Your LS-C
reports will give you your peak load components, and LS-F will give you your
Monthly load components - a better indicator of overall energy usage. <o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Keep in mind this doesn't factor in ventilation loads.
You will need to look at the SS-D report to get an overall picture of the loads
your system sees, and work backwards from that to get a picture of what the
ventilation component is. So for example - if your LS-C shows a peak cooling
load of 1000kBTU/hr and your SS-D Shows 1500 kBTU/hr, then your ventilation
loads will be 500 kBTU/hr. <b><span style='color:red'>[eQUEST users - please
correct me if I'm wrong here]<o:p></o:p></span></b></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>So if your glass conductance + Solar is 15% f the overall
load, then a 5% savings is pretty significant, however, if its 50% of the load,
then there might be a problem with your model. <o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Hope this helps<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray'>Vikram Sami</span></b><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>, LEED AP<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray'>Sustainable Design Analyst<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray'>1382 Peachtree St. NE, Atlanta, GA
30309<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray'>t: 404-443-7462
f: </span><span lang=ES style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:gray'>404.892.5823 </span><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray'> e:
vikram.sami@perkinswill.com </span><a
href="http://www.perkinswill.com/"><span style='font-size:9.0pt;font-family:
"Arial","sans-serif";color:gray;text-decoration:none'>www.perkinswill.com</span></a><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:3.0pt;text-autospace:none'><b><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Perkins+Will.</span></b><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> </span><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425'>Ideas +
buildings that honor the broader goals of society</span><span style='font-size:
9.0pt;font-family:"Arial","sans-serif";color:green'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoPlainText>-----Original Message-----<br>
From: equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] On Behalf Of Ben Pressman<br>
Sent: Tuesday, August 24, 2010 12:21 PM<br>
To: equest-users@lists.onebuilding.org<br>
Cc: Justin Murray<br>
Subject: [Equest-users] window replacement<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText> Thanks, Carol, for your quick response. I think my
question might have <o:p></o:p></p>
<p class=MsoPlainText>been too specific. My baseline model agrees to within 5%
of the actual <o:p></o:p></p>
<p class=MsoPlainText>gas and electric bills for the building. The exterior
walls, especially <o:p></o:p></p>
<p class=MsoPlainText>north and south elevations, are about 30% windows by
area. By replacing <o:p></o:p></p>
<p class=MsoPlainText>single-paned windows with double-paned, modern windows, I
am expecting <o:p></o:p></p>
<p class=MsoPlainText>about a 23% reduction in energy usage based on simple
heat equation <o:p></o:p></p>
<p class=MsoPlainText>estimations. eQuest is only returning a 5% savings. I
suspect I am not <o:p></o:p></p>
<p class=MsoPlainText>defining the replacement windows correctly, but it seems
there must also <o:p></o:p></p>
<p class=MsoPlainText>be a problem with how eQuest is calculating my heating
loads through the <o:p></o:p></p>
<p class=MsoPlainText>windows. I specified the windows' estimated percent wall
area, and also <o:p></o:p></p>
<p class=MsoPlainText>drew custom windows everywhere to match what the actual
building looks <o:p></o:p></p>
<p class=MsoPlainText>like. What is the best way to approach solving this
problem?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Thanks again,<o:p></o:p></p>
<p class=MsoPlainText>Ben<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>_______________________________________________<o:p></o:p></p>
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