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<p class="MsoNormal">Hi David,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Great! Thanks heaps.<o:p></o:p></p>
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<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060">Regards,<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060">Mostafa</span></b><span lang="EN-AU" style="font-size:10.0pt;color:#002060"><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"><b>From:</b> David BRADLEY <d.bradley@tess-inc.com> <br>
<b>Sent:</b> Saturday, 12 June 2021 12:33 AM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org><br>
<b>Cc:</b> Seyedmostafa Mousavi <sm.mousavi@unimelb.edu.au><br>
<b>Subject:</b> [EXT] Re: [TRNSYS-users] How to model a cavity zone under a building<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:red">External email: </span></b><span style="color:red">Please exercise caution<o:p></o:p></span></p>
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<p>Seyedmostafa,<o:p></o:p></p>
<p> You're on the right track. At least your method is the same that I used when I was modeling a similar situation. In my case there was a thin vinyl skirt around the building so I used its thermal resistance for my massless walls. I think the way to assess
the infiltration into the cavity is to couple the Type56 thermal model either with CONTAM (using Type97 or Type98) or with TRNFlow. Both are designed to estimate airflow between pressure nodes in buildings.<o:p></o:p></p>
<p>kind regards,<o:p></o:p></p>
<p> David<o:p></o:p></p>
<p><o:p> </o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">On 06/11/2021 05:06, Seyedmostafa Mousavi via TRNSYS-users wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Hope you are very well.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I’m modelling a cabin in SketchUp using the TRNSYS3D plugin. In the real cabin structure, several steel posts were used to elevate the cabin and separate its floor from the ground. The air easily flows in this cavity under the cabin, see
<b>Fig. 1</b>. To model the cavity, I’ve considered a bottom zone in which the walls were defined as
<i>Massless Layers</i> with R-value of 0.044 h m^2 K/ kJ (equal to the air gap), see
<b>Fig. 2</b>.<o:p></o:p></p>
<p class="MsoNormal">However, I’m not sure if this modelling process is correct. Do we have any option in TRNSYS to consider such cavity under buildings?<o:p></o:p></p>
<p class="MsoNormal">BTW, if this model is correct, how should I calculate the infiltration rate for the cavity section? Any idea is highly appreciated.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks a lot for your help.<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060">Warmly,</span></b><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060">Seyedmostafa Mousavi</span></b><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-AU" style="font-size:10.0pt;color:#002060">The University of Melbourne, Victoria 3010 Australia</span><span lang="EN-AU">
</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-AU" style="font-size:10.0pt;color:#002060">E:
</span></b><span lang="EN-AU" style="font-size:10.0pt;color:#002060"><a href="mailto:sm.mousavi@unimelb.edu.au">sm.mousavi@unimelb.edu.au</a>
</span><o:p></o:p></p>
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<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>TRNSYS-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><o:p></o:p></pre>
<pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></pre>
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<pre>-- <o:p></o:p></pre>
<pre>***************************<o:p></o:p></pre>
<pre>David BRADLEY<o:p></o:p></pre>
<pre>Principal<o:p></o:p></pre>
<pre>Thermal Energy Systems Specialists, LLC<o:p></o:p></pre>
<pre>3 North Pinckney Street - suite 202<o:p></o:p></pre>
<pre>Madison, WI 53703 USA<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>P:+1.608.274.2577<o:p></o:p></pre>
<pre><a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a href="http://www.tess-inc.com">http://www.tess-inc.com</a><o:p></o:p></pre>
<pre><a href="http://www.trnsys.com">http://www.trnsys.com</a><o:p></o:p></pre>
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