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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Steve, I do not know if you subscribe to the bldg-sim list serve, but would you be able to shed any light on this?</FONT></DIV>
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<DIV style="MARGIN: 0in 0in 0pt" align=left><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>Leonard Sciarra, AIA, LEED ap</FONT></SPAN></DIV>
<DIV style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>312.577.6580 (Dir)</FONT></SPAN></DIV>
<DIV style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>G E N S L E R | Architecture & Design Worldwide</FONT></SPAN></DIV>
<DIV style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>30 West Monroe Street</FONT></SPAN></DIV>
<DIV style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>Chicago IL, 60603</FONT></SPAN></DIV>
<DIV style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>312.456.0123</FONT></SPAN></DIV>
<DIV style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><FONT size=2>leonard_sciarra@gensler.com </FONT></SPAN></DIV></DIV></FONT></DIV></DIV>
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<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com on behalf of Kevin Burke<BR><B>Sent:</B> Wed 8/22/2007 10:11 AM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Stack Effect Calculations<BR></FONT><BR></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Dear All,</SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I’m currently looking at problems which may arise due to stack effect in a high rise mixed use building in London. Although most tall buildings these days have relatively good air tightness the proposed building will have the possibility of air penetrating the office façades from about 20m to 100m (70ft to 330ft) and again where there is apartments from 180m to 230m (600ft to 760ft). It is also possible that significant infiltration will occur at the top of the building. A number of lift shafts and stairwells under worst case situations allow this air to travel the full or close to the full height of the building. </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I have found a number of papers which discuss this topic but I haven’t come across a means of quickly estimating worst case scenario pressure differences for individual lift shaft or stairwells. Does anyone know of a calculation tool or similar which could do this. I have downloaded a program called COMTAMW. Does anyone know if this is a useful programme for proposed buildings where all the parameters are not know and may have to be estimated?</SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Kind Regards,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Kevin Burke</SPAN></FONT></P>
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<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN lang=EN-GB></SPAN></FONT> </P></DIV><PRE>____________________________________________________________
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