<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Lynn<DIV>The Therm software publicly available from the Windows & Daylighting group at LBNL allows a 2D finite element analysis of frames / thermal bridging. I have used this to look at aluminium and concrete thermal bridging to arrive at "effective" insulation values. I use this information to adjust inputs on other programs such as DOE-22 to reduce insulation thicknesses etc. Not sure what version Therm is up to but it is industry recognised for this type of analysis and allows a range of boundary conditions to be defined (heat flux, convection, long wave radiation etc).</DIV><DIV>Regards,</DIV><DIV>Graham<BR><DIV><DIV>On 20/02/2007, at 12:17 PM, Lynn Qualmann wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"> <DIV><FONT face="Arial" size="2"><SPAN class="788410901-20022007">I am modeling a proposed building with rectangular concrete pillars that thermally bridge the building shell with neither interior nor exterior insulation. The exterior portion of the pillars extend about 1.5' beyond the building's skin and are 1.5' wide. There are enough of them that they shouldn't be ignored, but I haven't found any good references on how to model them. I am assuming either an adjustment to the exposed area of the pillar or an adjustment to the material characteristics is in order. I don't want to make this into a research project, so I'm wondering if there are any good rules of thumb out there. Anyone?</SPAN></FONT></DIV> <DIV><FONT face="Arial" size="2"><SPAN class="788410901-20022007"></SPAN></FONT> </DIV> <DIV><FONT face="Arial" size="2"><SPAN class="788410901-20022007">Thanks in advance for any ideas.</SPAN></FONT></DIV> <DIV><FONT face="Arial" size="2"><SPAN class="788410901-20022007"></SPAN></FONT> </DIV> <DIV><FONT face="Arial" size="2"><SPAN class="788410901-20022007"><P><B><FONT face="Arial" size="2">R. Lynn Qualmann, P.E.</FONT></B> <BR><I><FONT face="Arial" size="2">SBW Consulting, Inc.</FONT></I> <BR><FONT face="Arial" size="2">2820 Northup Way #230</FONT> <BR><FONT face="Arial" size="2">Bellevue, WA 98004</FONT> <BR><FONT face="Arial" size="2">Phone: (425) 827-0330</FONT> <BR><FONT face="Arial" size="2">Fax: (425) 822-8119</FONT> <BR><FONT face="Arial" size="2">e-mail: <A href="mailto:rlq@sbwconsulting.com">rlq@sbwconsulting.com</A></FONT> </P></SPAN></FONT></DIV><PRE>
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