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Alessandro,<br>
Yes, the component order can have an impact on the simulation's
convergence although it is rare in my experience. The TRNSYS kernel
calls the components in the order in which they appear in the input
file. The kernel also determines that convergence has not been
reached after 30 iterations in a timestep (although you can change
the 30-iteration limit if you wish). If you have components in an
illogical order, it may take the system more iterations to solve
than if you have the components in a logical order. If you have got
a complex system anyway (where multiple iterations are needed in
order to solve) then an non-ideal component order can push you over
the iteration limit.<br>
I try to adjust the component order so that the components appear
in "flow order" - in other words so that the components are called
in the same order in which liquid flows through them. Of course
there are often loops so you have to decide a component that will be
first in the list. Since pumps set the flow for all downstream
components, they are a good choice. <br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/15/2013 06:44, Bellini Alessandro
wrote:<br>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222;background:white">Dear
TRNSYS Users,</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222">I
have some convergence problems running a Complex Solar
Thermal System (30 active components) when I made
parametrical analysis.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222">The
model stop at certain time of simulation without giving
error in the .LST file and "freezing the screen".<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222">I
have enough thermal capacity (pipes and storages) in every
circuit so I try to solve the problem changing the
"components order" in the "Global Info" and for some cases
this solution works well.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222">Have
anybody found the same problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222">I
would like to know if there are rules to follow in
the "components order" definition or where I can find some
information about it?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222">Thanks
for the support<o:p></o:p></span></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Trebuchet
MS","sans-serif"">Alessandro Bellini</span><span
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MS","sans-serif""><o:p></o:p></span></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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