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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Leticia<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I note you are going to be attending the DesignBuilder webinar I’m
giving soon, so hopefully I’ll be able to cover things in that which will
allow you to see how this could to some extent be carried out in DesignBuilder
E+ and CFD.<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I would however note, the issue of flow instability will be
difficult to correctly establish and model in many tools. Further, as
you will need to consider the effects of buoyancy combined with wind effects on
chimneys, I’m not certain that the algorithms used in the E+ will be able
to deal with this sufficiently accurately to allow comparison with the test
cell. Perhaps others on this list might be able to provide further
insight on this, but things that spring to mind include unsteady flow effects and
discharge coefficient variation. At the very least your modelling will
require careful application of appropriate wind surface coefficient values in
the E+ model but I won’t go into too much here as it will bore everyone
else rigid. It is possible to get reasonable comparison as is pointed out
in the following IJoV paper, but I think you may be forced down the route of
complex turbulence modelling to get good accuracy of your CFD which may force
you down an alternative software route. That being the case, it
will still be worth carrying out the E+ model and getting some boundary
conditions that puts your CFD simulations in the right area first off and hence
should increase the accuracy of them or at least allow them to get somewhere
near a reasonable solution. You might want to check out FDS which will
allow you to carry out transient LES turbulence models which I think will be
better for your research. <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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’ll try and get an electronic copy of my PhD thesis
together for you and you might also wish to check out the links to following
papers that might help you:<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a
href="http://www.ijovent.org.uk/IJV%20Vol%204/IJV%20V4%20No%204/IJV%20Abstract%20Vol%204%20No4%20Paper%204.htm">http://www.ijovent.org.uk/IJV%20Vol%204/IJV%20V4%20No%204/IJV%20Abstract%20Vol%204%20No4%20Paper%204.htm</a><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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a href="http://bse.sagepub.com/cgi/content/abstract/20/3/131">http://bse.sagepub.com/cgi/content/abstract/20/3/131</a>
(CIBSE BSERT paper based on early portion of my research)<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a
href="http://linkinghub.elsevier.com/retrieve/pii/S0167610599001361">http://linkinghub.elsevier.com/retrieve/pii/S0167610599001361</a><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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","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'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Paul<o:p></o:p></span></p>
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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><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Dr Paul Carey</span><span style='font-size:10.5pt;font-family:
Consolas;color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>BSc (Hons) PhD FRSA<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Zero Energy Design Ltd</span><span style='font-size:10.5pt;
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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>Leticia
Neves<br>
<b>Sent:</b> 09 December 2009 19:03<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] help in PhD research - solar chimney simulation<o:p></o:p></span></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>Hi,<o:p></o:p></p>
</div>
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<p class=MsoNormal> <o:p></o:p></p>
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<div>
<p class=MsoNormal>My PhD research is about the use of a tilted
solar chimney to enhance natural ventilation by stack effect, in
Brazil.<o:p></o:p></p>
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<div>
<p class=MsoNormal>I have built a test cell (picture attached) and I want to do
computer simulations of the solar chimney I proposed, in order to do some
parametric analysis and to verify the performance in several locations through
the country.<o:p></o:p></p>
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<div>
<p class=MsoNormal>I tried to use EnergyPlus but it wasn't very successfull.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I need a suggestion of sotware that is suitable for what I
need. Does anyone have an indication?<o:p></o:p></p>
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<div>
<p class=MsoNormal>In case of using TRNSYS, it is possible to do this kind of
simulation with the demo version, or do I have to have the TRNFlow module? (not
available at demo version)<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Thanks.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Leticia<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
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