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<p>Karol,</p>
<p> As far as I am aware TRNSYS has no knowledge of that is going on
in Excel. Trnsys calls Excel, waits for Excel to return something
and then proceeds on with calling the next component. If the
system of Trnsys components did not converge then Trnsys iterates
again and calls Excel again. I think that means that it an onion
type of coupling.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 03/02/2018 07:42, Karol Bandurski
via TRNSYS-users wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">Dear All,<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">I am considering to
couple TRNSYS and Excel model. My excel model is based on
“circular reference” so to calculate excel make some
iteration.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">1)<span
style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]--><span
lang="EN-US">Does TRNSYS respect it? I mean: does TRNSYS
will wait with the next time step or iteration on excel
calculation or TRNSYS take what is in given moment written
in excel (even if iteration is running)?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">2)<span
style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]--><span
lang="EN-US">Does TRNSYS – Excel coupling is onion or
ping-pong type? I mean: does TRNSYS – excel data exchange is
each iteration or each time step? <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">Regards,<br>
Karol<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">--------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Karol BANDURSKI M. Sc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Faculty of Civil and Environemntal Engeneering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Division of Heating, Air Conditioning and Air
Protection<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Poznan University of Technology<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><a
href="https://www.researchgate.net/profile/Karol_Bandurski"
moz-do-not-send="true">https://www.researchgate.net/profile/Karol_Bandurski</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:PL"><a
href="http://www.put.poznan.pl/%7Ekarol.bandurski"
moz-do-not-send="true"><span lang="EN-US">www.put.poznan.pl/~karol.bandurski</span></a></span><span
style="color:#1F497D;mso-fareast-language:PL" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><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
Madison, WI 53703 USA
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F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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