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Luis,<br>
I think the idea is that Type56 is calculating the effects of what
happens in the zone being modeled. The front side of the wall is
inside the zone so Type56 is going to calculate the air temperature,
the wall surface temperature, and (if you allow it to) the
convection coefficient between the air and wall. If you are trying
to model a surface in your zone that is always at some known
temperature then I think you are correct that the best way to model
it would be to specify a back-side temperature in direct contact
with a low-mass "wall." I would allow Type56 to calculate the
convection coefficient between your surface and the zone air
temperature since this convection coefficient is dependent on both
the magnitude and the "direction" of the temperature difference.<br>
Best,<br>
David<br>
<br>
<br>
On 8/2/2011 03:47, Claros Marfil, Luis Jesus wrote:
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"
lang="EN-US">Hi Trnsys Users,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"
lang="EN-US">I would like to know if it is possible
to define a
boundary value for the FRONT SIDE of a wall
directly. In page 6-103 (Type 56 - TRNSYS
16 Manual) it is said that : ”<i><span
style="font-style: italic;">Normally,
the boundary condition is the temperature of a
node connected to the back
surface of the wall through a pure resistance.
It is possible to specify the
surface temperature of the outside by setting
the back side heat transfer
coefficient of the WALL TYPE to a very small
value (less than 0.001 kJ/h/m2).</span></i>
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"
lang="EN-US">So, I understand that if a coefficient
with a value
of 0,001 kJ/h/m2 or lower is used, the boundary
temperature corresponds to the
back side, and the only way I find to “transform”
this back side
temperature into a front side temperature is using a
very-low resistance (massless
layer) by using a high convective heat transfer
coefficient in the front side. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"
lang="EN-US">Any idea would be highly appreciated.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"
lang="EN-US">Thanks,</span></font><span lang="EN-US"> <o:p></o:p></span></p>
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face="Verdana" size="1"><span
style="font-size: 8.5pt; font-family:
Verdana; color: black; font-weight:
bold;" lang="EN-US">Luis J. Claros
Marfil<o:p></o:p></span></font></b></a></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
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>
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