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<DIV dir=ltr align=left><SPAN class=956290614-18042007><FONT face=Arial
color=#0000ff size=2>also see the envelope section of the 90.1 users manual,
there they talk about the difference between center of glass and frame,
etc...</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV align=left>
<P style="MARGIN: 0in 0in 0pt" align=left><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>Leonard Sciarra, AIA, LEED ap<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>312.577.6580 (Dir)</FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>G E N S L E R | Architecture & Design Worldwide</FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>30 West Monroe Street<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>Chicago IL, 60603<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>312.456.0123<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>leonard_sciarra@gensler.com <o:p></o:p></FONT></SPAN></P></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Annalisa
Simonella<BR><B>Sent:</B> Wednesday, April 18, 2007 3:37 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] glass
u-vals<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hi
Aaron,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I hope it
helps.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Best
regards,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Annalisa.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P><FONT face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">Annalisa
Simonella</SPAN></FONT><FONT color=navy><SPAN lang=EN-US style="COLOR: navy">
</SPAN><o:p></o:p></FONT></P>
<P><FONT face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=1><SPAN
lang=EN-US style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">13 Fitzroy
Street</SPAN></FONT></st1:Street><FONT color=navy><SPAN style="COLOR: navy">
<BR></SPAN></FONT><st1:City w:st="on"><FONT face=Arial color=navy size=1><SPAN
lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">London</SPAN></FONT></st1:City><FONT
face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial"> <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 face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">T +44 (0)207 75
54593</SPAN></FONT><FONT color=navy><SPAN style="COLOR: navy">
<BR></SPAN></FONT><FONT face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">F +44 (0)207 75
53626</SPAN></FONT><FONT color=navy><SPAN style="COLOR: navy">
<BR></SPAN></FONT><FONT face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial"><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 face=Arial
color=navy size=1><SPAN lang=EN-US
style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: Arial"><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 style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN lang=EN-US style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN lang=EN-US
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN lang=EN-US
style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; 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 face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><EM><I><FONT face="Bookman Old Style" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Bookman Old Style'">Aaron
Dahlstrom</SPAN></FONT></I></EM><o:p></o:p></P>
<P class=MsoNormal><FONT face="Century Gothic" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Century Gothic'">AKF Engineers,
LLP<BR></SPAN></FONT><st1:Street w:st="on"><st1:address w:st="on"><FONT
face="Century Gothic" size=1><U1:STREET u2:st="on"><U1:ADDRESS u2:st="on"><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 'Century Gothic'">1500 Walnut Street, Suite
1400</SPAN></FONT></st1:address></st1:Street><FONT face="Century Gothic"
size=1><SPAN
style="FONT-SIZE: 9pt; 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 face="Century Gothic" size=2><SPAN
style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">==================<o:p></o:p></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">You received this e-mail because you are subscribed <o:p></o:p></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">to the BLDG-SIM@GARD.COM mailing list. To unsubscribe <o:p></o:p></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">from this mailing list send a blank message to <o:p></o:p></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">BLDG-SIM-UNSUBSCRIBE@GARD.COM<o:p></o:p></SPAN></FONT></PRE></DIV><PRE>____________________________________________________________
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