<div dir="ltr"><div dir="ltr">Thanks for the answer, in my case I know the ventilation cross flow induced by the stack effect and I suppose that this flow cross all the zone. </div><div dir="ltr"><br></div><div dir="ltr">Do I need to delete the horizontal air nodes adjacent surface (surface inside the radiation zone) to get just one radiation zone ? </div><div dir="ltr"><br></div><div>If we know the flow between airnodes, is it better to put it via coupling between zones pop up ? <br><img src="cid:ii_lcusilpg3" alt="image.png" width="542" height="320"><br> or through surface definition, adjacent coupling air flow (if the adjacent surfaces are not deleted) ? </div><div><br></div><div><img src="cid:ii_lcusjctx4" alt="image.png" width="496" height="129"><br></div><div><br></div><div>Thanks a lot.</div><div><br></div><div>Regards,</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 13 janv. 2023 à 16:56, David BRADLEY <<a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Loïc,</p>
<p> The best way to address airflow within a building is to couple
your Type56 simulation either with TRNFlow or CONTAM (Type97). The
basic idea is that you build a parallel model to your Type56
containing information about the airflow openings between the
airnodes (a radiation zone can contain multiple airnodes,
especially where there is an atrium like you have described).
TRNFlow or CONTAM then take the air node temperatures as well as
the wind speed and geometry of the building and determine the
amount of air flow that results between the air nodes. Large
horizontal openings are challenging because both TRNFlow and
CONTAM treat air flow through a horizontal opening as
unidirectional. Still, it is by far the most rigorous way of
treating the situation.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div>On 1/13/2023 8:29 AM, Loic Tachon via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Dear Trnsys community,
<div><br>
</div>
<div>I want to simulate the stack effect in a high room with
high thermal gain.</div>
<div><br>
</div>
<div>For this, I have 1 zone and 5 thermal air nodes in the z
direction to get the temperature at several heights. <br clear="all">
<div><img src="cid:185ac1a8350cb971f161" alt="image.png" width="243" height="480"><br>
</div>
<div>How can I do this and avoid that TRNSYS see ceiling
between the zone ? Do I need to delete the horizontal
surface for zone 2-3-4 ? Or do I put mass less horizontal
surface ?</div>
<div><br>
</div>
<div>As Well, how do I do the cross flow ventilation ? Do I
use the couple mass flow between zones ?</div>
<div><img src="cid:185ac1a8350cb971f162" alt="image.png" width="542" height="323"><br>
</div>
<div><br>
</div>
<div> or I put a coupling air flow (same that natural
ventilation mass flow) for the horizontal surface ?</div>
<div><img src="cid:185ac1a8350cb971f163" alt="image.png" width="503" height="137"><br>
</div>
<div><br>
</div>
<div>Thanks a lot. </div>
<div><br>
</div>
<div>Best regards,</div>
<div><br>
</div>
-- <br>
<div dir="ltr">
<div dir="ltr"><font style="font-size:12.8px" color="#000000"><b>Dr. Loïc Tachon </b></font>
<div style="font-size:12.8px">
<div><font color="#000000">(+33) 6 7440-0536 (France)</font></div>
<div><br>
</div>
</div>
<div><font color="#e69138"><b><br>
</b></font></div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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</pre>
</blockquote>
<pre cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>
<a href="http://www.tess-inc.com" target="_blank">http://www.tess-inc.com</a>
<a href="http://www.trnsys.com" target="_blank">http://www.trnsys.com</a></pre>
</div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><font style="font-size:12.8px" color="#000000"><b>Dr. Loïc Tachon </b></font><div style="font-size:12.8px"><div><font color="#000000">(+33) 6 7440-0536 (France)</font></div><div><br></div></div><div><font color="#e69138"><b><br></b></font></div></div></div></div>