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<p class=MsoNormal>Hi all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a question about how to accurately model U-factors in
windows. As thermal resistance (or I guess heat transfer coefficient as we’re
talking about U-factors, not R-values) varies with temperature, a window will
have a different U-factors in typical summer and winter conditions (I believe
the environmental conditions are specified by NFRC).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My question is: given a window with a U-0.19 in winter and
U-0.20 in summer, what is the best way to model this? Is it best to average the
two numbers? Or pick the winter U-factor as it will be more accurate while modeling
winter months (where the difference between inside and outside temperature can
be on the order of 70°F as compared to the temperature difference in summer that
is only 30°F or so)?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If a window is imported from, WINDOW5 does eQUEST actually
calculate the U-factor at every temperature/temperature difference? And if so,
is it worth trying to create this file to import to eQUEST?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m using eQUEST, but maybe this topic applies to all
energy modeling software (and should be sent around the Building-Sim List Serv).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I appreciate any and all thoughts.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Kind regards,<o:p></o:p></p>
<p class=MsoNormal>Alex Krickx<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></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@01CAA4C6.62740150"
alt="email_sig"></span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:9.0pt'>1250 Elko Dr, Sunnyvale, CA
94089<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt'>(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"'>Warning:</span></i></b><i><span
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