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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>John,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>NFRC U factor is always calculated at the winter
condition. If you input the NFRC U factor, SHGC and VT, eQuest converts U
factor to Glass-Conduct and SHGC to Shading-Coeff.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>e.g if you input NFRC U-Factor as 0.4 and
SHGC as 0.2, VT as 0.3 (From the NFRC label), eQuest will convert the values as
follows: <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>"Window Type #1 GT" = GLASS-TYPE<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> TYPE
= SHADING-COEF<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> SHADING-COEF =
0.229885<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> GLASS-CONDUCT = 0.434216<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> VIS-TRANS
= 0.3<br>
<br>
</span></font><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It uses the formula from the table you
mentioned to convert the U-factor into conductance. I agree with you that there
is a difference in U factor input and eQuest and </span></font><font
color=navy><span style='color:navy'>the resultant window U-value in the LV-D
report. My recollection from my conversation with the developer is that there
was a bug in the reporting in LV-D though the program uses the accurate value
for the simulation.</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In this case, it assumes frame width as
0.0. You will notice it in your .inp file.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>"North Win (G.N3.E3.W2)" =
WINDOW <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> GLASS-TYPE
= "Window Type #1 GT"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <span style='background:red'>FRAME-WIDTH
= 0</span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
X
= 60.64<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
Y
= 3<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
HEIGHT = 5.22<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
WIDTH =
8.11057<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> FRAME-CONDUCT = 2.781<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I hope it helps..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mahabir<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 face="Book Antiqua"><span
style='font-size:10.0pt;font-family:"Book Antiqua"'>Mahabir Bhandari, Ph.D.<br>
Senior Energy Analyst<br>
Carli Inc.<br>
Tel: (413) 256 4647<br>
Fax: (413) 256 4823<o:p></o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 face="Book Antiqua"><span
style='font-size:10.0pt;font-family:"Book Antiqua"'> Web: </span></font><font
face="Book Antiqua"><span style='font-family:"Book Antiqua"'><a
href="http://www.fenestration.com"><font size=2><span style='font-size:10.0pt'>www.fenestration.com</span></font></a></span></font><font
size=2 face="Book Antiqua"><span style='font-size:10.0pt;font-family:"Book Antiqua"'><o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
<br>
<br>
<br>
</span><o:p></o:p></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> John Weale
[mailto:jweale@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, October 24, 2005
6:12 PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [bldg-sim] EQuest
handling of window conductance?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hello,<br>
<br>
I am doing some modeling with EQuest 3.55 and am trying to understand two
things: How to input an NFRC window U-value, and how the DOE2.2 engine deals
with window conductance. <br>
<br>
For inputting an NFRC window U-value, the help file offers Table 2.5 under
Glass Conductance to convert between "manufacturer's U-Value and DOE-2
glass conductance." However, the conversion is different between summer
and winter, and conductance is a single input, not a seasonal one. Is it
really a matter of doing a weighted average of the converted Summer and Winter
U-values? I am leaving the emissivity at its default 0.84.<br>
<br>
Once the conductance is fed in (1), the resultant window U-value in the LV-D
report does not match the conductance. I assume that Table 2.5 is intended to
add the air film, and I am not modeling any frame (2). Does DOE2.2/EQuest
assume a frame of some sort by default?<br>
<br>
Thank you for any insights,<br>
<br>
John Weale<br>
<br>
<br>
(1) "GLASS-0.470-0.563" = GLASS-TYPE <br>
TYPE =
SHADING-COEF<br>
SHADING-COEF = 0.5635<br>
GLASS-CONDUCT = 0.531<br>
<br>
(2) A typical window definition:<br>
"WINDOW3" =
WINDOW <br>
GLASS-TYPE =
"GLASS-0.470-0.563"<br>
SHADING-SCHEDULE = "DEFAULT-SHADE"<br>
MULTIPLIER = 1<br>
HEIGHT
= 13.86<br>
WIDTH = 13.86<br>
MAX-SOLAR-SCH = "SHADE-CTRL"<br>
..<o:p></o:p></span></font></p>
</div>
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