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Salim,<br>
I do not think it is possible to set the initial wall surface
temperature different from the zone air temperature. What I would
recommend that you do is set up a month-long period at the start of
your simulation during which your zone is subject to constant
conditions (ambient temperature = 30C, no solar, no gains, etc.). This
will get rid of all the initial transient behavior of the zone. You
would then step change to your new fixed ambient temperature (and
whatever other conditions you care about) and look at the wall energy
transfer.<br>
Regards,<br>
David<br>
<br>
<br>
On 10/8/2010 03:37, salim mokraoui wrote:
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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’m trying to solve a heat
transfer problem
through a finite thickness wall using Type 56 model (one uniform zone).
I want
to calculate the energy flux from air node (fixed temperature) to
inside surface
and that from outside surface to outdoor (fixed temperature) as well
as inside
and outside surface temperatures. The aim is to compare Trnsys solution
with
another method. I could find significant results but I have some
problems with
initialization. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
lang="EN-US"><span style="">1.<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
</span></span></span><!--[endif]--><span lang="EN-US">I don’t know
how to give
initial temperatures for the wall different form that of the zone
(Trnsys uses
the same initial temperature of walls than the zone )<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
lang="EN-US"><span style="">2.<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
</span></span></span><!--[endif]--><span lang="EN-US">If I set the
initial temperature
to 30 °C (for the zone and walls) and 0 °C for ambient outdoor, the
energy flux
from outside surface to outdoor starts from zero, which is not true.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Have you any suggestion to
solve these two
problems ?<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">With best regards.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Salim MOKRAOUI<o:p></o:p></p>
<p class="MsoNormal">Faculté des sciences de Nancy - LERMAB<o:p></o:p></p>
<p class="MsoNormal">BP 239<o:p></o:p></p>
<p class="MsoNormal">54506 Vandoeuvre.<o:p></o:p></p>
<p class="MsoNormal">Tél 03 83 68 48 47 - mél
<a class="moz-txt-link-abbreviated" href="mailto:salim.mokraoui@lermab.uhp-nancy.fr">salim.mokraoui@lermab.uhp-nancy.fr</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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David BRADLEY
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