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Marcello,<br>
To my knowledge there is not a way to precondition the walls. I
would expect that with such thick walls you would need to run the
building for at least a 6 month period (if not a 1 year period) in
order to get rid of all the initial value transients. If it makes
you feel any better to know that you are not alone in your misery of
waiting for a slow simulation, I often have models that run more
slowly than 1 month per 40 minutes! Some ground coupling simulations
run at near real-time!<br>
kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/05/2015 08:06,
<a class="moz-txt-link-abbreviated" href="mailto:marcello.caciolo@cofelyaxima-gdfsuez.com">marcello.caciolo@cofelyaxima-gdfsuez.com</a> wrote:<br>
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<p class="MsoNormal">Dear Trnsys users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I am currently working
on a very massive building, with many zones and very with
high thermal inertia (concrete wall from 60 to 120 cm of
thickness). The model takes 40 minutes to calculate 1 month.
<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 observe than after one
month, final temperatures in zones are still very depending
on initial temperatures. For this reason, I tried to adjust
initial temperature to be nearer to expected final
temperatures (in the order of 35-40°C). <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">However, in the first
part of the simulation, temperatures drop quickly to
25-30°C, depending on the zone. This is quite surprising,
considering that there are no heat losses and there are heat
gains. The only explication I found is that surface
temperatures are not initialized to initial temperature of
the zone, and thermal mass takes time to warm up.<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">Do you know if there is
a way to force surface temperatures to zone temperatures at
the beginning of a simulation ?<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">Thank you ! <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">Best
regards, <o:p>
</o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-family:"Tahoma","sans-serif";color:#58595B">Marcello
Caciolo</span></b><span
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
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