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<p>Dr Belmonte,</p>
<p> It is quite common and intentional that components would be
called more than once at a single timestep. The TRNSYS engine
iterates through the components until it gets a converged solution
at each timestep from all the components in the system. If the
system is a pass-through (i.e. the working fluid goes once through
the system and there are no fluid loops anywhere in the system
then I would not expect to see iterations but as soon as there is
a feedback loop you should get iteration. <br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 04/03/2017 06:09, Miguel Angel Reyes
via TRNSYS-users wrote:<br>
</div>
<blockquote cite="mid:003301d2ac6a$b7998c50$26cca4f0$@imdea.org"
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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"><span lang="EN-US">I’m modelling a system
using a network of heat exchangers for heat recovery
purposes (see attached picture). <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Heat exchanger
calculations seems to be repeated many times for a given
time-step and their temperatures re-calculated within the
same time-step while other components on that model are not
updated until the next time step (as it should be). Problem
observed at the exchanger is leading to wrong temperature
calculations. From our understanding types should be only be
called once every time-step, furthermore heat exchangers
network should be re-calculated taking the temperature from
connecting models. Is there any option or any idea to bring
light on this problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Kinds regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="ES">---------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">Dr. Miguel Ángel Reyes
Belmonte<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">IMDEA ENERGY Institute<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">Avda. Ramón de la Sagra, 3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">Parque Tecnológico de
Móstoles<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">E-28935 Móstoles, Madrid,
Spain<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Telf.: +34 91 737 1150<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">e-mail: </span><span
lang="ES"><a moz-do-not-send="true"
href="mailto:miguelangel.reyes@imdea.org"><span
lang="EN-US">miguelangel.reyes@imdea.org</span></a></span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">web: </span><span
lang="ES"><a moz-do-not-send="true"
href="http://www.energy.imdea.org"><span lang="EN-US">http://www.energy.imdea.org</span></a></span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES"><a moz-do-not-send="true"
href="https://es.linkedin.com/pub/miguel-angel-reyes/7b/347/b77"><span
lang="EN-US">https://es.linkedin.com/pub/miguel-angel-reyes/7b/347/b77</span></a></span><span
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#494A4C;background:white" lang="ES">orcid.org/0000-0002-9666-2388</span><span
lang="ES"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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<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>
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