<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<title>Message</title>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="State"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="place"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="Street"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PostalCode"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="City"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="address"/>
<!--[if !mso]>
<style>
st1\:*{behavior:url(#default#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Bookman Old Style";
panose-1:2 5 6 4 5 5 5 2 2 4;}
@font-face
{font-family:"Century Gothic";
panose-1:2 11 5 2 2 2 2 2 2 4;}
@font-face
{font-family:"\@SimSun";
panose-1:2 1 6 0 3 1 1 1 1 1;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:blue;
text-decoration:underline;}
p
{mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman";}
pre
{margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:Arial;
color:navy;}
@page Section1
{size:21.0cm 841.95pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-GB link=blue vlink=blue>
<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Aaron,<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'>The overall U-value is usually
significantly higher than the centre-pane U-value. In order to estimate the
overall U-value of curtain walls or windows you need to include the frames
U-values and the edge effects and the additional effect of point thermal
bridges if present (structural connections through the facade or window).<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'>You may find some guidance in the NFRC standards
<a href="http://www.nfrc.org/technicaldocs.aspx">http://www.nfrc.org/technicaldocs.aspx</a>
and you may use the software THERM (downloadable from the LBNL website <a
href="http://windows.lbl.gov/software/">http://windows.lbl.gov/software/</a> )
to calculate the U-value + edge effects of frames. <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'>You may also find some guidance in the EN
ISO 10077-1 and EN ISO 10077-2 which define a different method from the NFRC
one, also the first one gives simplified method and includes a table with pre-calculated
linear thermal transmittances (edge effect).<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'>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'>Best regards,<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'>Annalisa.<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>
<div>
<p><font size=1 color=navy face=Arial><span lang=EN-US style='font-size:7.5pt;
font-family:Arial;color:navy'>Annalisa Simonella</span></font><font color=navy><span
lang=EN-US style='color:navy'> </span><o:p></o:p></font></p>
<p><font size=1 color=navy face=Arial><span lang=EN-US style='font-size:7.5pt;
font-family:Arial;color:navy'>Arup<b><span style='font-weight:bold'>FacadeEngineering</span></b></span></font><font
color=navy><span style='color:navy'> <br>
</span></font><st1:address w:st="on"><st1:Street w:st="on"><font size=1
color=navy face=Arial><span lang=EN-US style='font-size:7.5pt;font-family:
Arial;color:navy'>13 Fitzroy Street</span></font></st1:Street><font
color=navy><span style='color:navy'> <br>
</span></font><st1:City w:st="on"><font size=1 color=navy face=Arial><span
lang=EN-US style='font-size:7.5pt;font-family:Arial;color:navy'>London</span></font></st1:City><font
size=1 color=navy face=Arial><span lang=EN-US style='font-size:7.5pt;
font-family:Arial;color:navy'> <st1:PostalCode w:st="on">W1T 4BQ</st1:PostalCode></span></font></st1:address><font
color=navy><span lang=EN-US style='color:navy'> </span><o:p></o:p></font></p>
<p><font size=1 color=navy face=Arial><span lang=EN-US style='font-size:7.5pt;
font-family:Arial;color:navy'>T +44 (0)207 75 54593</span></font><font
color=navy><span style='color:navy'> <br>
</span></font><font size=1 color=navy face=Arial><span lang=EN-US
style='font-size:7.5pt;font-family:Arial;color:navy'>F +44 (0)207 75 53626</span></font><font
color=navy><span style='color:navy'> <br>
</span></font><font size=1 color=navy face=Arial><span lang=EN-US
style='font-size:7.5pt;font-family:Arial;color:navy'>M +44 (0)77 1781 4793</span></font><font
color=navy><span lang=EN-US style='color:navy'> </span><o:p></o:p></font></p>
<p><font size=1 color=navy face=Arial><span lang=EN-US style='font-size:7.5pt;
font-family:Arial;color:navy'><a href="mailto:annalisa.simonella@arup.com">mailto:annalisa.simonella@arup.com</a></span></font><font
color=navy><span style='color:navy'> <br>
</span></font><font size=1 color=navy face=Arial><span lang=EN-US
style='font-size:7.5pt;font-family:Arial;color:navy'><a
href="http://www.arup.com/facadeengineering/">http://www.arup.com/facadeengineering/</a></span></font><font
color=navy><span lang=EN-US style='color:navy'> </span></font><o:p></o:p></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US 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 lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
BLDG-SIM@gard.com [mailto:BLDG-SIM@gard.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Dahlstrom, Aaron<br>
<b><span style='font-weight:bold'>Sent:</span></b> 18 April 2007 04:24<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] glass u-vals</span></font><span
lang=EN-US><o:p></o:p></span></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>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ASHRAE 90.1 window U-vals are for the "assembly."</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Manufacturer's data for my project is for "center of
glass."</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is anyone familiar with a way to get from one to the other?</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have a frame type and u-value; however, Fund. Chap 31
seems to caution against doing hand calcs due to edge-of-glass effects.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><em><i><font size=3 face="Bookman Old Style"><span
style='font-size:12.0pt;font-family:"Bookman Old Style"'>Aaron Dahlstrom</span></font></i></em><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt;font-family:"Century Gothic"'>AKF Engineers, LLP<br>
</span></font><st1:Street w:st="on"><st1:address w:st="on"><font size=1
face="Century Gothic"><u1:Street u2:st="on"><u1:address u2:st="on"><span
style='font-size:9.0pt;font-family:"Century Gothic"'>1500 Walnut Street,
Suite 1400</span></font></st1:address></st1:Street><font size=1
face="Century Gothic"><span style='font-size:9.0pt;font-family:"Century Gothic"'><br>
<st1:place w:st="on"><st1:City w:st="on"></u1:address></u1:Street><u1:place u2:st="on"><u1:City u2:st="on">Philadelphia</st1:City></u1:City>,
<u1:State u2:st="on"><st1:State w:st="on">PA</u1:State></st1:State> <u1:PostalCode u2:st="on"><st1:PostalCode
w:st="on">19102</u1:PostalCode></st1:PostalCode></st1:place></u1:place> <br>
Phone: (215) 282-2169<br>
Fax: (215) 735-6706<br>
</span></font><font size=2 face="Century Gothic"><span style='font-size:10.0pt;
font-family:"Century Gothic"'><a href="http://www.akf-engineers.com/"><font
color=black><span style='color:black'>www.akf-engineers.com</span></font></a></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>
</div>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>==================<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>You received this e-mail because you are subscribed <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>to the BLDG-SIM@GARD.COM mailing list. To unsubscribe <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>from this mailing list send a blank message to <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>BLDG-SIM-UNSUBSCRIBE@GARD.COM<o:p></o:p></span></font></pre></div>
<pre>____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses
</pre><PRE>
===========================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></body>
</html>