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<p>Maja,</p>
<p> The air coupling option simply allows air to pass directly from
one zone to another. As with many things in Type56 you can choose
to specify a constant amount, a scheduled amount, or an input
amount that will come from some other model or from an equation.
The question, of course, is how to know how much air will flow
from one node to another. In very simple HVAC systems you might
know; if you have a VENTILATION supply in one zone and you know
that the only return is in a neighboring zone then it is a fairly
simple matter of setting the quantity of air that passes between
the two nodes. In more complex systems you need to couple the
Type56 thermal model of the building with an airflow model that
will estimate the internodal air transfers. There are two options.
One is TRNFLow, which is a commercially available add-on to
Trnsys. It uses the same TRNBuild interface but allows you to
define airflow links between airnodes. It uses an engine called
COMIS to determine air flow rates. The other alternative is to use
CONTAM/Type97. Type97 is a standard component and the CONTAM
interface is freely available
(<a class="moz-txt-link-freetext" href="https://www.nist.gov/services-resources/software/contam">https://www.nist.gov/services-resources/software/contam</a>). The
disadvantage is that you'll need to reenter a good bit of building
information into the CONTAM interface. There is an example of a
building coupled with a CONTAM airflow model in the
.\Trnsys18\Examples\ directory if you want to have a look.</p>
<p>kind regards,</p>
<p> David</p>
<p> <br>
</p>
<div class="moz-cite-prefix">On 04/05/2022 06:42, Maja Danovska via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAD-EhmOkuH2oVztF7mUKtjTnLiPQ__osD8ENpzAQ9FcQuu7O+Q@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Dear Users,
<div><br>
</div>
<div>I would like someone to explain to me better the AIR
COUPLING option in every single thermal zone, when it should
be used, and how... </div>
<div><br>
</div>
<div>I have a geometrical model of a library which was divided
into different thermal zones, some of them with real
boundaries (i.e., walls), others with virtual surfaces or
maybe modelled with a ceiling but in reality there you have
stairs, so the volumes are connected. This is just an example.
Where should I use the air coupling?</div>
<div><br>
</div>
<div>Thanks in advance.</div>
<div><br>
</div>
<div>Kind regards<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr"><b>Maja Danovska</b>
<div><b><br>
</b>
<div>Research Fellow</div>
<div><span style="color:rgb(34,34,34)">Dep. of Civil,
Environmental and Mechanical Engineering</span><br
style="color:rgb(34,34,34)">
<span style="color:rgb(34,34,34)">University of Trento</span><br>
</div>
<div><span style="color:rgb(34,34,34)">via Mesiano, 77 -
38123 - Trento - ITALY</span><span
style="color:rgb(34,34,34)"><br>
</span></div>
<div><span style="color:rgb(34,34,34)"><br>
</span></div>
<div><span style="color:rgb(34,34,34)"><a
href="mailto:maja.danovska@unitn.it"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">maja.danovska@unitn.it</a> </span></div>
<div><span style="color:rgb(34,34,34)">+393403391289</span></div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
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</blockquote>
<pre class="moz-signature" 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 class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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