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<font face="Times New Roman, Times, serif">The ideal overhang depends
on your latitude. It is an easy and standard passive solar calculation</font>.
You can google calculators based on your zip. Your window shade can be
designed to exclude the summer sun and allow the winter sun to enter.
Depending on your results you might want to adjust your window sill
height. If your building has fans on 24 hours a day you may not see a
big winter benefit due to the heat loss at night without insulating
curtains. If your fans only run during occupied times you might think
you have a benefit but is is only because eQuest is not calculating the
heat loss when the fans are off. At the end of the day, you have a
chunk of wall at R-2. It is actually a little worse than this, the
glass is radiating heat outside at a higher rate than an insulated wall
would as well. This is also why there is such a game being played with
the low E coatings, you can adjust the selectivity of incoming and out
going radiation depending on where you are and what you are trying to
accomplish. One of the glass manufacturers has what is called
"Canadian low E", it maximizes incoming radiation and minimizes out
going, no good in Miami though, you want to minimize incoming and
maximize outgoing(maybe). I don't think eQuest is totally "tuned" in
this area from some of the observations others have made concerning
glass and shading.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
On 08/07/2010 05:18 PM, Sami, Vikram wrote:
<blockquote
cite="mid:5CFB01489F62D143B61289AF32DC98B1031D193110@chi01exmb.perkinswill.net"
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<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I'm
not sure thats a surprising result. Depending on your window height,
you might be over shading your window and reducing some of the passive
solar heat gain in winter. I don't see how the shades will help in
winter - they will reduce the heat gain.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">The
trick is always to balance out when your summer benefits outweigh your
winter penalty. This is why we model - to optimize these aspects.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style=""><b><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">Vikram
Sami</span></b><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">,
LEED AP<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">Sustainable
Design Analyst<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">1382
Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">t:
404-443-7462 f:
</span><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;"
lang="ES">404.892.5823 </span><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">
e: <a class="moz-txt-link-abbreviated" href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a>
</span><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><a
moz-do-not-send="true" href="http://www.perkinswill.com/"><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray; text-decoration: none;">www.perkinswill.com</span></a></span><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom: 3pt;"><b><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">Perkins+Will.</span></b><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: gray;">
</span><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: rgb(173, 212, 37);">Ideas
+ buildings that honor the broader goals of society</span><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: green;"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Bosch, Crina<br>
<b>Sent:</b> Thursday, July 08, 2010 4:44 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Window shade<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";" lang="RO">I
have a residential building that needs to be modeled with window
shading on the south side. When I input the shading 24” to each window
on the south side of the building my heating during winter and the
pumps results every month are increased and the shading doesn’t help at
all. This doesn’t make any sense to me. In the winter time on the south
side during summer the shading should help after theory. In the winter
should help too because the sun will heat the windows and heat up the
spaces. <o:p>
</o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";" lang="RO">Any
help would be appreciated.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";" lang="RO">Thank
you.
<o:p></o:p></span></p>
<div>
<p style="margin-bottom: 12pt;"><span
style="font-size: 10pt; font-family: "Arial","sans-serif";">Crina Bosch</span><o:p></o:p></p>
<p> <o:p></o:p></p>
</div>
<p class="MsoNormal"><span lang="RO"><o:p> </o:p></span></p>
</div>
<br>
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