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Bastien,<br>
When you segment an active layer, the segments are in series, not
in parallel so I would think that the first segment would have the
highest effective cooling power (biggest difference between water
and air temperature) and that the cooling powers should drop off
asymptotically (a lot at first, then less and less with each
additional segment). <br>
<br>
As for whether QCOMI is the correct ntype to watch, I am less
sure. My understanding is the QCOMI is the energy that crosses the
inside surface boundary. As a result, it is going to have other
effects besides the cooling floor. For example convection on the
inside surface, radiation exchange on the inside surface, energy
that was already stored in the floor (not so important in your case
since you are looking at steady-state operation), interactions with
whatever you have beyond the active layer such as a BOUNDARY
temperature or another zone. Still, if you want to see the cooling
effect of the floor on the room (taking into account all those other
factors), QCOMI is probably a good place to start.<br>
Best,<br>
David<br>
<br>
<br>
On 11/14/2011 09:40, Bastien GARBAY wrote:
<blockquote
cite="mid:4DB7DCF5A0B00C469B2EA4CCC226CC507A1C5B@enertech-ms01.enertech.local"
type="cite">
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<div><font face="Arial" size="2">
<div><font face="Arial" size="2"><span
class="107373814-14112011">Dear TrnSys users,</span></font></div>
<div><font face="Arial" size="2"><span
class="107373814-14112011">I'm trying to model a cooling
floor under TrnBuild. I use an active layer with a
constant input temperature (17°C). I would like to model
the effect of a constant fluid flow on the building
temperature and on the effective cooling power of the
floor. In order to allow for my constant flow (3.8
kg/h.m²), I use the automatic segmentation of the active
layer. My model runs all right.</span></font></div>
<div><font face="Arial" size="2"><span
class="107373814-14112011">In order to assess the
cooling power of the floor, I use the surface output
n°19 "QCOMI". This output is calculated for each
segment. My problem is that when I compare the QCOMI for
each segment, they are really diffrenet. I would have
expected similar results.</span></font></div>
<div><font face="Arial" size="2"><span
class="107373814-14112011">- Is my model allright to
model a cooling floor ? </span></font></div>
<div><font face="Arial" size="2"><span
class="107373814-14112011">- Is QCOMI the correct output
to assess the effective cooling power of the floor ?</span></font></div>
<div><font face="Arial" size="2"><span
class="107373814-14112011">- If both previous answers
are yes, would have any idea of why such a difference
between the QCOMI of each segment ?</span></font></div>
<div><font face="Arial" size="2"><span
class="107373814-14112011">Thank you for your help !</span></font></div>
</font></div>
<div> </div>
<div align="left"><font face="Arial" size="2"><strong>Bastien
GARBAY</strong></font></div>
<span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
<div align="left"><em><strong>Cabinet SIDLER / ENERTECH<br>
Quartier Bourgounion<br>
F-26160 FELINES SUR RIMANDOULE<br>
tel-fax : +33 (0)4 75 90 18 54<br>
Courriel : </strong></em><a moz-do-not-send="true"
href="mailto:garbay@enertech.fr"><em><strong>garbay@enertech.fr</strong></em></a><span
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><br>
<em><strong>Site : </strong></em><a moz-do-not-send="true"
title="http://www.enertech.fr/"
href="http://www.enertech.fr/"><em><strong>www.enertech.fr</strong></em></a><br>
</span></div>
</span>
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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
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