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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>How about adding a removable lite of glass from the interior at
vision areas? Removable to allow cleaning in between lites should there be any
incidental scumming over time. Inner lite can be kept in place with a 2 piece
stop and perimeter gaskets. The new inner glass lite can be coated with a solar
control pyrolytic low-e coating (Pilkington has one). Work can be done at night
to limit tenant disruption. <o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>David De Rose, M.A.Sc., P.Eng., BSSO<o:p></o:p></span></b></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:9.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Halsall Associates <br>
</span></b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Tel: 416.644.0341 </span><span style='font-size:8.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>•</span><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Toll
Free: 1.888.425.7255 </span><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>•</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <a href="http://www.halsall.com/"><span style='color:blue'>www.halsall.com</span></a><br>
</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:black'>Vancouver • Calgary • Sudbury • Burlington • Toronto •
Ottawa • Dubai<br>
</span><b><i><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";
color:#1C467A'>Best Workplaces in Canada, Five Consecutive Years: 2007 - 2011</span></i></b><i><span
style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:#1C467A'><br>
</span></i><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#7F7F7F'>__________________________<br>
</span><b><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";
color:black'>A Parsons Brinckerhoff Company</span></b><b><span
style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span></b><span
lang=EN-US style='font-size:6.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Adam
Jackaway<br>
<b>Sent:</b> October 6, 2011 4:42 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Curtain wall retrofit options<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>Hi folks,<o:p></o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>I'm currently involved with a
prospective project to retrofit an existing urban office building in a robust
four-season climate. The building is roughly 60 floors, circa early 1960's,
with an original single pane, non-thermally-broken aluminum curtain wall, and
anodized aluminum spandrel panels. We don't have exact glazing specs yet, but
COG is likely in the range of: SHGC=0.43, Tvis=0.53, Uval=1.00<o:p></o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>Here's the question: If you
wanted to retrofit the facade to improve overall building energy / occupant comfort
(heating, cooling, solar control, daylighting, MRT adjacent to glazing,
etc.), <u>but were required to retain the original glazing (for
architectural considerations, or due to impracticality of complete facade
removal with existing tenants)</u>, what options might you pursue? Additional
potential constraints of note (still to be determined) may include: mullion
depth limitations, structural facade load limits. Also worth noting that the
building's rectangular plan features a SW-facing long-axis orientation, so
spring-through-fall cooling loads are likely to be enormous. Finally, if a
second skin solution is to be pursued, we're also keen to keep an eye on
condensation issues.<o:p></o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>What's the latest, greatest
thinking in this arena? Suggestions / comments much appreciated....<o:p></o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>cheers,<o:p></o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal style='background:white'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>Adam<o:p></o:p></span></p>
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