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The accepted workaround is to add another wall type that is
comprised of 12" of just concrete (U = 5.5 W/sq-m C) and has a
height equal to your slab thickness -- say 6". So the area would be
the wall length x the slab thickness.<br>
<br>
Not sure if this is clear -- it is better described on page 7-9 of
the EE4 modelling guide.<br>
<br>
Brian<br>
<br>
On 6/17/2011 10:20 AM, Aaron Smith wrote:
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<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Hello,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; 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: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; 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: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; 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: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Thanks,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Aaron<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-left: 27pt;"><strong><b><font
size="3" face="Times New Roman"><span style="font-size:
12pt;">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: 27pt;"><i><font
size="2" color="gray" face="Verdana"><span
style="font-size: 10pt; 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: 9pt; 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: 9pt; font-family: Verdana;"><img
id="_x0000_i1025"
src="cid:part1.07010305.03030200@greensim.com"
border="0" height="35" width="170"></span></font><o:p></o:p></p>
<p class="MsoNormal" style="text-indent: 27pt;"><font size="1"
color="gray" face="Verdana"><span style="font-size: 9pt;
font-family: Verdana; color: gray;" lang="FR">t: (902)
422-7393</span></font><span lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent: 27pt;"><font size="1"
color="gray" face="Verdana"><span style="font-size: 9pt;
font-family: Verdana; color: gray;" lang="FR">f: (902)
423-4945</span></font><span lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent: 27pt;"><font size="1"
color="gray" face="Verdana"><span style="font-size: 9pt;
font-family: Verdana; color: gray;" lang="FR">e:</span></font><font
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font-family: Verdana;" lang="FR"> </span></font><font
size="1" face="Verdana"><span style="font-size: 9pt;
font-family: Verdana;"><a moz-do-not-send="true"
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
style="font-size: 12pt;" lang="FR"> <o:p></o:p></span></font></p>
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