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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello,<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'>When performing energy modeling to determine compliance with
the Canadian Energy Code (MNECB), penetrations through the building envelope
must be taken into account when calculating wall R-values if their area exceeds
2% of envelope area. I’m working on a LEED project and trying to calculate
the wall R-value of a Hotel taking into account heat losses from the balconies which
are extensions of the floor slab (balcony penetrations exceed 2% of envelope
area).<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'>I realize this is a rather complex heat transfer problem but
hope there may be an easy approximation. My first thought was to treat
them like a parallel path heat transfer problem: 1/Req = %slab/Rslab +
%wall/Rwall but I’m thinking that may not be fair (perhaps this would be
used if you had concrete studs in the wall). My other thought is to treat
the slab penetrations as a separate wall type (uninsulated concrete wall) –
this would have a reduced affect on the overall wall R-value. <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'>Does anyone have thoughts on this?<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'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Aaron<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 style='margin-left:27.0pt'><strong><b><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Aaron Smith, </span></font></b></strong><em><i><font
color=gray face="Times New Roman"><span style='color:gray'>P.Eng</span></font> </i></em><o:p></o:p></p>
<p class=MsoNormal style='margin-left:27.0pt'><i><font size=2 color=gray
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:gray;
font-style:italic'>LEED® AP BD+C,</span></font></i><i><font size=1
color=gray face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:gray;font-style:italic'> M-ASHRAE, Mechanical Engineer</span></font></i><o:p></o:p></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'><img width=170 height=35 id="_x0000_i1025"
src="cid:image001.jpg@01CC2CE0.93702B00" border=0></span></font><o:p></o:p></p>
<p class=MsoNormal style='text-indent:27.0pt'><font size=1 color=gray
face=Verdana><span lang=FR style='font-size:9.0pt;font-family:Verdana;
color:gray'>t: (902) 422-7393</span></font><span lang=FR><o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:27.0pt'><font size=1 color=gray
face=Verdana><span lang=FR style='font-size:9.0pt;font-family:Verdana;
color:gray'>f: (902) 423-4945</span></font><span lang=FR><o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:27.0pt'><font size=1 color=gray
face=Verdana><span lang=FR style='font-size:9.0pt;font-family:Verdana;
color:gray'>e:</span></font><font size=1 face=Verdana><span lang=FR
style='font-size:9.0pt;font-family:Verdana'> </span></font><font size=1
face=Verdana><span style='font-size:9.0pt;font-family:Verdana'><a
href="mailto:asmith@mreng.ca"><span lang=FR>asmith@mreng.ca</span></a></span></font><span
lang=FR><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=FR
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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