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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Graham,<o:p></o:p></span></font></p>
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10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Sorry if I wasn’t clear. The <b><u><span
style='font-weight:bold'>concrete</span></u></b> has a corrugated exterior finish,
there is no metal layer. It’s a solid (with metal rebar embedded) concrete
wall.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steven<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Graham Carter
& Megan Lyall [mailto:hamnmegs@ozemail.com.au] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, January 28, 2008 12:22
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Steven Savich<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">bldg-sim@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Exterior
wall heat transfer in eQuest</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>This is an interesting one. I gave it some thought a few years
back when I came across precast concrete blades projecting outside (shades),
but directly exposed to the outside. I thought of using Therm to estimate
the effective U-Value of the wall for winter heat loss purposes but didn't take
it any further at the time.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>The air gap between the corrugated metal and concrete provides a
relatively significant level of insulation. If your effective exterior
surface area is say 1.3 of your projected surface area what you would ideally
be able to do is raise your external heat transfer coefficient by the same or
similar factor. I don't know of a way to do this in DOE-2.2 other than
modify surface roughness, but you could play with the cavity air-gap insulation
value to derate the assembly but then this value does not vary with wind speed
... . This would approximate only the modified convection effects.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>As for solar radiation it should be similar as the corrugation would
self shade and thus the wall always sees the projected area normal to the sun
... . As for long wave radiative heat transfer you could max out the
emissivity but this only gives you a 10-15% max increase given what the
unmodified emissivity likely is. Could you play with sky-view factors (I think
you can vary them in 2.2) to increase the amount of sky a surface sees to
account for the extended surface area .... ?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Good luck I would be interested if any of the forum participants have
come across refereed papers in this area. In parts of <st1:country-region
w:st="on"><st1:place w:st="on">Australia</st1:place></st1:country-region> the
cold bridging created by a concrete blade or an aluminium curtainwall fin can
be significant. The latter is disturbingly common on non-thermally broken
curtainwall suites. I reckon the benefits of the shading could be
outweighed by the unaccounted penalties ...<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Regards,<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Graham <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On 29/01/2008, at 4:42 AM, Steven Savich wrote:<o:p></o:p></span></font></p>
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<br>
<o:p></o:p></span></font></p>
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</xml><![endif]-->Hello all,<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I’m about to
start working on a model for an existing classroom building. The exterior
walls are uninsulated concrete with a “corrugated” exterior surface that would
appear to me to greatly increase the effective surface area for winter heat
loss/summer heat gain. Any thoughts about how to approach modeling with
this in eQuest?<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks,<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Steven<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
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Savich</span></font><u1:p></u1:p><o:p></o:p></p>
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size=2 face="Bookman Old Style"><span style='font-size:10.0pt;font-family:"Bookman Old Style"'>Systems
West Engineers</span></font><u1:p></u1:p><o:p></o:p></p>
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