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Christian,<br>
It sounds as though the connection from Type80 to Type56 is
correct (in TRNBuild, you indicate that the outside convection
coefficient for a wall should be an INPUT and you give the input a
name such as HBACK3, then you connect some model to the new Type56
input). You might need to have a look at the inputs to Type80,
however. Type80 takes the surface temperature and the surrounding
air temperature and computes a convective energy transfer
coefficient so you would need to go back in to TRNBuild and add an
output for the outside surface temperature of your wall, then pass
the new Type56 output to Type80. You can repeat the process with
multiple instances of Type80, one for each of your different
surfaces.<br>
<br>
A word of caution, however! Type80 computes a convection
coefficient based on that natural convection dominates. On outside
surfaces, forced convection from the wind almost always dominates
the heat transfer. You might be better served finding a correlation
that computes a forced convection coefficient instead.<br>
Best,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/23/2013 06:52, Brembilla Christian
wrote:<br>
</div>
<blockquote
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<div style="direction: ltr;font-family: Tahoma;color:
#000000;font-size: 10pt;">Dear All,
<div><br>
</div>
<div>I have a problem with TYPE 80. I would like to see the <i>convective
coefficient</i> <i>for</i> <b>back side</b> of surface
change in time. </div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">I tried to set TYPE 80, I
started in TRNBuild and I chose the INPUT <i>keyword </i>,
HBACK3, then in Simulation studio I connected TYPE 80 <i>Convective
coefficient for back side of surface </i>with TYPE 56
HBACK3, and them I plot it.</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">When I run the simulation
the convective coefficientfor <b>back side</b> starts from 0
and it remains always constant at a about 9.5. I done the
same thing with VERTICAL and the result does not change.</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div>I can set the <i style="font-size: 10pt;">convective
coefficient</i><span style="font-size: 10pt;"> </span><i
style="font-size: 10pt;">for</i><span style="font-size:
10pt;"> </span><b style="font-size: 10pt;">front side </b><span
style="font-size: 10pt;">of surface with TRNBuild chosing
internal calculation.</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">Questions:</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">-someone could explain me
how to use INPUT especially the difference between HBACK3
and VERTICAL.</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">-how select a proper
surface, for instance I would like to see the convective
coefficient for the surface facing to the south, for the
surface facing to the north and so on.</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">Regards</span></div>
<div><span style="font-size: 10pt;"><br>
</span></div>
<div><span style="font-size: 10pt;">Christian</span></div>
</div>
<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>
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