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Didier,<br>
We do this quite often using the GenOpt/TRNSYS coupling called
TRNOpt (the TESS Optimization Library) for parameters that are not
contained in the *.b17. What we typically do is use a Type9 to read
the measured inlet and outlet conditions. The measured inlet
conditions are used as the driving force for other TRNSYS models
(flow rates, temperatures, etc.). The ojective function is as you
suggest; the difference between the the simulated and measured
results. Sometimes we use a function that only looks at the
difference when the system is on (pumps are active). Sometimes, we
define the objective function so that the difference between
integrated results is minimized. It is also very important to keep
the parameter identification as simple as possible by looking at
individual pieces of a system (such as identifying the best fit heat
exchanger effectiveness) and then building the whole system model
from the calibrated pieces. If the parameter identification is being
done on too complicated a system then there are often too many
variables that affect the performance.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 6/26/2013 03:42, Gossard, Didier
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">I want to <span style="font-size:11.5pt">find
parameter values (like interior/exterior convective
coefficients, thermal conductivities for instance) that make
the model calculated by TRNSYS (actually a multizonal
building with Type 56) most closely to measured data. This
is the well-known problem called “parameter identification”.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt">Does someone
know tools developed under TRNSYS environment (a type ?)that
can perform parameter identification ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt">Initially, I
wanted to do it by coupling GenOpt and TRNSYS, but it is a
tough solution (particularly, defining the objective
function based on the difference between model results and
measured data to minimize is difficult).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt">Best
regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt">Didier
GOSSARD.</span><o:p></o:p></p>
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<br>
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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
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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