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<p>Marco,</p>
<p> We did indeed change the behavior of Type11 with Trnsys17 back
to what it had been long ago. The issue at hand is that when there
is no flow through the diverter, what should the output values be
set to (specifically the outlet temperatures)? Some claim that the
output value should be set to the input value when there is no
flow. Others would prefer the last calculated value of the output
to be held until flow starts. This causes issues if controls are
based on the outlet conditions of the diverters. There is not
really a correct answer; it is just a matter of the assumption
that you wish to make when writing the model. Our reasoning was
that the temperature of the diverter should go to the inlet
temperature so that there is not a temperature difference across
the diverter under no-flow. </p>
<p> If you are seeing a dramatic change in energy between the two
versions, that is an indication that your controls are not
operating the same between the two. Usually, systems that exhibit
this behavior are systems that are low on thermal capacitance
(i.e. there aren't enough pipes modeled in the various hydronics).
Low- or no-capacitance hydronic loops react unrealistically
quickly to control decisions and can become unstable. I would be
curious to know whether you see the same energy differences
between the v16 and v17 simulation if you add piping to your flow
network.</p>
Kind regards,
<p> David<br>
<br>
</p>
<div class="moz-cite-prefix">On 4/30/2013 10:48, Marco Noro wrote:<br>
</div>
<blockquote cite="mid:002a01ce45ba$35de0760$a19a1620$@noro@unipd.it"
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<p class="MsoNormal"><span lang="EN-US">Dear Trnsys-users,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have opened a .tpf
project that I had built and run in Trnsys 16 with the new
release Trnsys 17.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With my great surprise,
the energy balances (it is a solar cooling plant) of the
same project with the two Trnsys releases are very very
different.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I realized that the mass
flows are different, and in particular I think that type 11
behaves in a different way in trnsys 16 and 17.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The problem is that in
my project a have a lot of diverter, mixer, ecc., so: how
can I solve this problem? That is, the same project should
behave in the same way!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I add that the problem
could be also (or) in type 2 behaviour in the two trnsys
releases…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you for your
cooperation!<o:p></o:p></span></p>
<p class="MsoNormal">Best regards<o:p></o:p></p>
<p class="MsoNormal">Marco Noro<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0">***************************************</span></i><i><span
style="font-family:"Cambria","serif";color:#0070C0"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span
style="font-family:"Cambria","serif";color:#0070C0">Marco
Noro, PhD<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Cambria","serif";color:#0070C0"
lang="EN-US">Assistant Professor in Applied Physics<o:p></o:p></span></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0"
lang="EN-US">Department of Management and Engineering
(DTG) - University of Padova<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0">stradella
San Nicola, 3 - 36100 Vicenza (VI) - Italy<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0">tel.
+390444 998704 - fax +390444 998884<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0">e-mail
</span></i><span
style="font-family:"Cambria","serif";color:#0070C0"><a
moz-do-not-send="true" href="mailto:marco.noro@unipd.it"><span
style="color:blue">marco.noro@unipd.it</span></a></span><u><span
style="font-family:"Cambria","serif";color:#002060"><o:p></o:p></span></u></p>
<p class="MsoNormal"><span
style="font-family:"Cambria","serif";color:#002060">
<u><a moz-do-not-send="true"
href="mailto:noro@gest.unipd.it"><span
style="color:blue">noro@gest.unipd.it</span></a><o:p></o:p></u></span></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0">PEC</span></i>
<u><span
style="font-family:"Cambria","serif";color:blue"
lang="EN"><a moz-do-not-send="true"
href="mailto:marco.noro-7002@postacertificata.gov.it"><span
style="color:blue" lang="IT">marco.noro-7002@postacertificata.gov.it</span></a></span></u><span
style="font-family:"Verdana","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#4F81BD">web
</span></i><u><span
style="font-family:"Cambria","serif";color:#002060"><a
moz-do-not-send="true"
href="http://sites.google.com/site/marconoro03/"><span
style="color:blue">http://sites.google.com/site/marconoro03/</span></a><o:p></o:p></span></u></p>
<p class="MsoNormal"><i><span
style="font-family:"Cambria","serif";color:#0070C0">skype
</span></i><span
style="font-family:"Cambria","serif";color:blue">nereo3</span><span
style="font-family:"Cambria","serif";color:#002060"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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<pre wrap="">_______________________________________________
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</pre>
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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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