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<p>Antoine,</p>
<p> Thanks for sharing your solution. I would be quite grateful if
you would be willing to share the code. We have run into a fixed a
lot of these kinds or errors. Many times the iteration will solve
to within the original (tighter) tolerances if the initial guess
values are reset but some of those routines leave the last guess
values behind and so they are used as a starting point for the
beginning of the next iteration. Unfortunately our solution does
not work in every case so we implement fixes as we find problems.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 10/09/2019 02:56, LECONTE Antoine
219492 via TRNSYS-users wrote:<br>
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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is my recent experience that I think
can be useful for some of you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>Problem</u> : When simulating the
operation of an Air to Water Heat pump (Type 941 from TESS
lib), the simulation starts normally and then freezes few
hours later without letting any message (no warnings, nothing
in the log or lst file). Whereas the HP operation conditions
are quite usual and there is no sudden events at the
problematic simulation time.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>Reason</u> : Actually, Type941 calls the
TRNSYS “Moist Air properties” functions to have the states of
air at different points of the HP. The air can be close to the
saturation pressure. When close to those nonlinear conditions,
the implemented solver in this function (secant method) can
turn around the solution without reaching the required
tolerance (being still very close). In this case, the
calculations can’t go out of this iterative solver. The
simulation is stuck.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>Possible solution</u> : I have modified
the code of the “Moist Air properties” to gradually raise the
tolerance when there is too much iteration in this kind of
solver. So that a solution can be found at each time and
avoiding such a problem. I can share my modified code if
needed.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="FR">------------------------------------------------------------------------------------------</span><span
style="color:#1F497D" lang="FR"><o:p></o:p></span></p>
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<p class="MsoNormal"
style="line-height:120%;text-autospace:none"><b><span
style="font-size:10.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#1F497D">Antoine
LECONTE</span></b><b><span
style="font-size:10.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#1F497D"><o:p></o:p></span></b></p>
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style="line-height:120%;text-autospace:none"><b><span
style="font-size:10.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888">Research
Engineer<o:p></o:p></span></b></p>
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style="line-height:120%;text-autospace:none"><i><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888">National
Institute of Solar Energy
<o:p></o:p></span></i></p>
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style="line-height:120%;text-autospace:none"><b><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888">CEA/LITEN
- Department of Solar Energy</span></b><b><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#1F497D"><o:p></o:p></span></b></p>
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style="line-height:120%;text-autospace:none"><b><span
style="font-size:10.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888">Building
and Thermal Systems<o:p></o:p></span></b></p>
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style="line-height:120%;text-autospace:none"><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888"
lang="FR">Commissariat à l’énergie atomique et aux
énergies alternatives<o:p></o:p></span></p>
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style="line-height:120%;text-autospace:none"><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888"
lang="FR">Bât. HELIOS, 50 avenue du Lac Léman
</span><b><span
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style="line-height:120%;text-autospace:none"><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#888888"
lang="FR">T. +33 (0)4 79 79 21 38
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lang="FR">antoine.leconte@cea.fr</span></a></span><span
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lang="FR">;
</span><span
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href="http://www.ines-solaire.org/"
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lang="FR">www.ines-solaire.org</span></a></span><span
style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:black"
lang="FR">;
</span><span
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href="liten.cea.fr" moz-do-not-send="true"><span
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style="font-size:8.0pt;line-height:120%;font-family:"Arial",sans-serif;color:black">
</span><span
style="font-size:10.0pt;line-height:120%;font-family:"Arial",sans-serif;color:#E60019"
lang="FR"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D" lang="FR">------------------------------------------------------------------------------------------</span><span
style="color:#1F497D" lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
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