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Dan:<br><br>
Sorry for the delay in responding to your question--I've been out of
town. EnergyPlus does have the capability to model radiant systems
directly without the "dummy zone" technique that you are forced
to use with other programs. Papers on the model have been published
in a variety of places (including ASHRAE). You can find some of
those technical papers as well as program documentation on the radiant
system model via the Documentation link from the EnergyPlus web site
(<a href="http://www.energyplus.gov/" eudora="autourl">www.energyplus.gov</a>).<br><br>
I hope this information helps.<br><br>
Rick Strand<br><br>
<br>
At 11:29 AM 6/29/2005, you wrote:<br><br>
<blockquote type=cite class=cite cite><font face="Times New Roman, Times" size=2>What
is the best way to model a radiant cooling (thermo-active slab) system
for a commercial building?<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2> <br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2>In the past I have
attempted to mimic this system with Equest by using a fan coil system,
eliminating fan energy, and then handling OA requirements in a “dummy”
zone. Please let me know if you have any suggestions and/or papers
that discuss modeling radiant cooling using this technique or any other
technique (EnergyPlus?).<br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2> <br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2>Also, does anyone have
experience or comments on TAS? The software’s web site claims to be
capable of modeling radiant cooling however when I reviewed some
literature on the subject it appeared to be a bit limited. For
example, a major drawback to modeling radiant cooling in TAS is the
temperature or operation of the radiant cavity cannot be controlled by
the space temperature. Therefore the operation has to be controlled by
on/off schedule in the equipment schedule. This seems a bit
questionable when analyzing annual energy use but maybe this is the best
approach available. It seems, at a minimum, it would be a good way
to check peak cooling loads against the previously discussed Equest
mimic. <br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2> <br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2>Anyway… thanks in
advance for the help.<br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2> <br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2>Dan Sobrinski<br>
</font><font face="arial" size=2><br>
</font><font face="Times New Roman, Times" size=2>Econergy<br>
</font><br><br>
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