<span class="Apple-style-span" style="border-collapse: collapse; font-family: arial, sans-serif; font-size: 13px; ">Srishti,</span><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><br>
</span></font></div><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"> Try to found a topic named "Double Facades" on bldg-sim list. I asked the same question some time ago. The major problem in this cases ,is the heat loss by convection inside de facade, because otherwise it will percfectly work as a thin zone.</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><br></span></font></div><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"> I found something on google, someone asking for an energyplus's developer:</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><br></span></font></div><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><div>
<i>I'm simulating an office with a double skin façade using the "exterior vented natural cavity." </i></div><div><i>The façade is naturally ventilated and has Venetian blinds in the gap. The blinds are exposed to solar </i></div>
<div><i>radiation and, during the day, they can reach very high temperatures which may affect the temperature of the air in the gap and/or the performance of the glass façade. Does EnergyPlus take into </i></div><div><i>account these two effects? </i></div>
<div><i>Answer </i></div><div><i>The exterior vented natural cavity model is for *opaque* surfaces only and does not apply to glazing </i></div><div><i>systems. There is a model for blinds in the window gap that takes those two things into account, but I </i></div>
<div><i>am not sure if it works together with the air flow window model.</i></div><div><i><br></i></div><div>Please let me know if you do some progress. I'm from Brazil and our climate conditions are very similar.</div>
<div><br></div><div>Good Luck,</div><div><br></div><div>Francisco Massucci</div></span></font><br><div class="gmail_quote">On Tue, May 10, 2011 at 5:10 AM, Chris Yates <span dir="ltr"><<a href="mailto:chris.malcolm.yates@gmail.com">chris.malcolm.yates@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">
Srishti,<br>
I have no experience of the Therm/ LBNL Window link that you speak
of but as long as you're happy with working within the limitations
of the E+ shading calculation you should be fine. I'm not sure of
the latest E+ but the main historical limitation I'm aware of is
that solar gain to a zone is absorbed by the floor (with some
specific exceptions). This is expedient for most simulation tasks
but will not suffice if you wish to model solar penetrating through
subsequent zones (within a double sheet facade, where the cavity is
modelled as a zone for example). The E+ documentation is extensive
and covers this in detail.<br>
There are a number of options for the type of solar calc undertaken.
There are also options for convection coefficient. You may find both
of these affect results and simulation time.<br>
Good luck<br>
Chris<div><div></div><div class="h5"><br>
<br>
On 10/05/2011 06:58, srishti srivastava wrote:
<blockquote type="cite">
<pre>Dear Friends,
I am Srishti Srivastava from India. My research topic is related to
evaluation of different types of facades in Indian context with
special reference to the modern glazed facades.
I am trying to simulate a building with curtain wall in Energy Plus. I
know of one way of doing it through Window and Therm software from
LBNL, although there are few issues in that. Is there any alternative
way to simulate curtain wall in Energy Plus.
Does anyone have a prior experience of simulating curtain wall in
Energy Plus. Can anyone help me in simulating a curtain wall in Energy
Plus.
Thanks in advance.
Srishti Srivastava,
India.
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<br>
</div></div><div>-- <br>
<div>
<p>Chris Yates <span style="color:rgb(79, 98, 40)">C Eng
MCIBSE</span></p>
<p><i>Building Physics Consultant</i></p>
<p>Tel:<span> </span>+447960731576</p>
<p>Email: <a href="mailto:chris.malcolm.yates@gmail.com" target="_blank">chris.malcolm.yates@gmail.com</a></p>
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