<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p>Med. Omar FANNAN,</p>
<p> This list is intended as a place in which users can assist
other users although it is often used as a starting point for
technical support. If you have specific technical support
questions you should email them to the distributor from whom you
(or your institution) purchased TRNSYS. If you aren't sure who to
contact then please send me an email directly (i.e. not to this
list) and include the information from your user17 (which can be
opened with a text editor). <br>
</p>
<p> The list and description of TRNSYS access functions such as
getIsConvergenceReached() can be found in the 07ProgrammersGuide
manual in the ..\Trnsys17\Documentation\ folder.</p>
<p> Convergence can be impacted by component order. You can change
the component order by clicking on the "control cards" tool in the
left hand toolbar (where you set the simulation start and stop
times) and then switching to the component order tab.</p>
<p> Convergence problems can be hard to track down because there
can be many causes. Here are a few hints about them. <br>
</p>
<p>- make sure that your timestep is not too long. TRNSYS can only
make one control decision per timestep. If you are using a long
timestep and are using a controller model to control a system that
has a time constant shorter than your timestep you are going to
run into convergence problems. Time steps should typically be on
the order of 1 to 5 minutes.<br>
</p>
<p>- make sure you have enough thermal capacitance in your system.
This is basically the same as the above point; thermal capacitance
increases the time constant of the system and causes it to respond
more slowly (and more realistically) to control state changes.</p>
<p>- you can look in the *.lst and *.log files to find out which
components are failing to converge.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 06/20/2016 05:12, Med. Omar FANNAN
via TRNSYS-users wrote:<br>
</div>
<blockquote
cite="mid:CAAiekUMXXe_LrtJp-uk_0BatA2zi+X4qtmVf7n1anvc_D4h8Uw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Greetings,</div>
<div><br>
</div>
<div>First of all, I really don't know if I'm posting in the
right section, but it never hurts to try.</div>
<div><br>
</div>
<div>I'm only just starting to use TRNSYS, so excuse my
questions if they seem silly :</div>
<div>Is there a listing of intrinsic TRNSYS routines (like
getIsConvergenceReached and such?)</div>
<div>How can I resolve convergence problems?</div>
<div>Is the order of execution of the UNITS important?</div>
<div><br>
</div>
<div>Thank's in advance,</div>
<div><br>
</div>
<div>Med. Omar FANNAN (AKA MOF)</div>
<div><br>
</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>