<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Daniel, <br>
</p>
<p>Usually the way we have done this is to use two BOUNDARY surfaces
in the Type56 model. Thes boundary surfaces pass there QCOMO
values (outputs from Type56) to our model. Our model computes the
temperature of the layer in between the two BOUNDARY surfaces and
passes that back to Type56. <br>
</p>
<p>It is not uncommon to need a time delay component (such as Type93
or Type661) to delay the temperature that is passed back to
Type56. Something similar may be needed in your case. If you do
use the time delay then I'd advise keeping your time step short so
that the interaction is still occurring on a realistic time basis.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 07/11/2018 20:18, Weber Daniel via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:349D77A0543D2E449434718A111E5F1D5E5CEA46@MBX13.d.ethz.ch">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<style type="text/css" id="owaParaStyle"></style>
<div style="direction: ltr;font-family: Tahoma;color:
#000000;font-size: 10pt;">Dear TRNSYS users,
<div><br>
</div>
<div>I am modelling a 3D multizone building with Type 56. My
building has exotic TABS which cannot be defined with the
standard TRNSYS model, therefore I am modelling them in MATLAB
with an adjusted RC model.</div>
<div>My TABS lay between the first and second level (in the
floor of the second level/ceiling of first level). Thus, there
is one heat flux going into each room (above and below). I
tried to input my heat flux from the TABS MATLAB model as a
heat gain to the inside surface of the floor of the second
level and to the ceiling of the first level. These two
surfaces are modelled as massless layers with a maximum R
value, to prevent any heat flux going through, as all heat
flux calculations going through these layers are calculated in
my MATLAB model. I have attached a picture showing the setup.</div>
<div><br>
</div>
<div>Unfortunately I am getting covergence errors in the first
time step.</div>
<div><br>
</div>
<div>I don't want to input my heat fluxes directly to the air
node, as I would like to take advantage of TRNSYS
sophisticated radiative and convective heat transfer
calculations. Additonally, I think this wouldn't be precise as
the surface temperature of my TABS surfaces are greatly
affected by its heat flux.</div>
<div><br>
</div>
<div>Any suggestions what the problem could be or how else I
could implement this?</div>
<div><br>
</div>
<div>Thank you for your helps and best regards,</div>
<div><br>
</div>
<div>Daniel Weber</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a>
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<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>
</body>
</html>