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Hi<br>
<br>
Using En+ for DS may lead to unrealistic results. A student of mine
made is MSc comparing En+ results to the monitoring results of a
naturally ventilated DSF test cell and the air gap air
temperature/ventilation flow was significantly out of reality
(unfortunately it's in portuguese). Similar results obtained by Kim et
all may be found at <a class="moz-txt-link-freetext"
href="http://www.iaqvec2010.org">http://www.iaqvec2010.org</a>
.<br>
You can check at IEA Annex 44 (<a class="moz-txt-link-freetext"
href="http://www.ecbcs.org/annexes/annex44.htm#p">http://www.ecbcs.org/annexes/annex44.htm#p</a>.)
what is available and a set of pros and cons, but DSF is not an easy
task to properly model. <br>
<br>
R B wrote:
<blockquote
cite="mid:AANLkTinY7XC_D4-WDwEee-1ZnqrHijgsu1oLK07aqZqR@mail.gmail.com"
type="cite">
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Maybe modelling the cavity as sunspace might work - it will not take
care of the cavity ventilation part but will probably work for the
solar radiation part (not sure if sunspace allows for daylighting - you
will have to check on that.)<br>
Another option would be to use EnergyPlus - I think it has an example
file for double facade.<br>
<br>
-Rohini<br>
<br>
<div>On Thu, Nov 11, 2010 at 8:58 AM, Sami, Vikram <span><<a
moz-do-not-send="true" href="mailto:Vikram.Sami@perkinswill.com">Vikram.Sami@perkinswill.com</a>></span>
wrote:<br>
<blockquote>
<div lang="EN-US">
<div>
<p>We are doing a project in a pretty cold climate. The project
design has a really big glass façade facing south. One of the ideas to
reduce
conductive heat loss is to create a double skin façade on the south
side.</p>
<p> </p>
<p>Now I realize that this is going to take a fair amount of
analysis work to design it properly. What I was wondering is if there
is a
quick analysis tool/methodology to tell if this is even feasible to go
into
more detailed analysis. </p>
<p> </p>
<p>Any help would be much appreciated</p>
<p> </p>
<p><b><span>Vikram Sami</span></b><span>, LEED AP</span></p>
<p><span>Sustainable Design Analyst</span></p>
<p><span>1382 Peachtree St. NE, Atlanta, GA
30309</span></p>
<p><span>t: 404-443-7462 f: </span><span lang="ES">404.892.5823 </span><span>
e:
<a moz-do-not-send="true" href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a>
</span><a moz-do-not-send="true" href="http://www.perkinswill.com/"><span>www.perkinswill.com</span></a><span></span></p>
<p><b><span>Perkins+Will.</span></b><span> </span><span>Ideas +
buildings that honor the broader goals of society</span><span></span></p>
<p><b><span><img moz-do-not-send="true" alt="75logo_only.gif"></span></b><span>Years
of Design Innovation</span><b><span></span></b></p>
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<br>
<br>
<br>
-- <br>
--------------------------------------------------------------------------------<br>
Rohini Brahme, Ph.D. LEED AP<br>
Building energy analysis, tool development, and training<br>
Dallas/Fort Worth, TX<br>
<br>
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