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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=631285613-21092004>Dear
Isabelle,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=631285613-21092004></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=631285613-21092004>Many
thanks for your immediate reply!</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=631285613-21092004>I am
afraid I described the slab profile slightly confusing.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=631285613-21092004>The
ceiling surface area of the coffered ceiling slab is the same for both
cases and approximately 1/3 larger than the floor area.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=631285613-21092004>Case
1, is define by pipe work embedded in the <FONT face="Times New Roman"
color=#000000 size=3>horizontal ceiling and coffer, and
</FONT></SPAN></FONT></DIV>
<DIV><SPAN class=631285613-21092004>Case 2, by <FONT face=Arial color=#0000ff
size=2>pipe work embedded in the </FONT><FONT face="Times New Roman"
color=#000000 size=3>horizontal ceiling only.</FONT></SPAN></DIV>
<DIV><SPAN class=631285613-21092004></SPAN> </DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial size=2>Meaning for the
cooling case is the mean surface temperature for case 1 lower as for case 2 due
to the thermal resistance of the concrete. </FONT></SPAN></DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial size=2>My worry is
the impact of the slope of the coffer on the radiant heat exchange and
subsequently on the overall transfer coefficient.</FONT></SPAN></DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial size=2>Due you have any
thoughts?</FONT></SPAN></DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial
size=2>Thanks!</FONT></SPAN></DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=631285613-21092004><FONT face=Arial
size=2>Christian</FONT></SPAN></DIV>
<DIV><SPAN class=631285613-21092004></SPAN> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Ursprüngliche Nachricht-----<BR><B>Von:</B> Isabelle BRUYERE
[mailto:bruyere@arch.ucl.ac.be]<BR><B>Gesendet:</B> 21 September 2004
14:52<BR><B>An:</B> Christian Struck<BR><B>Betreff:</B> Re: [TRNSYS-users]
coffered thermally activated slab representation<BR><BR></FONT></DIV>Dear
Christian,<BR><BR>Wouldn't it be sufficient to change the slab surface in the
various solutions ? Case 2 , the slab surface is the same as the floor one,
case one, it is more important.<BR><BR>Just an idea ...<BR><BR>Good
work,<BR><BR>Isabelle<BR><BR><BR>A 14:41 21/09/2004 +0100, vous avez écrit
:<BR>
<BLOCKQUOTE class=cite cite="" type="cite">Dear TRNSYS user,<BR><BR>I am
about to model a coffered ceiling slab with embedded pipe work in<BR>TRNSYS
15. What I am querying before I start the modelling process in PREBID<BR>is
how I would represent the coffer with embedded pipe work! To my
current<BR>understanding it is only possible to represent ceilings a s flat
slabs.<BR>However the coffer increases the heat exchanging surface area and
thereby<BR>results in an increased heat exchange coefficient between ceiling
soffit and<BR>room, dominated by the radiant component. <BR><BR>Could you
please point me towards a solution that represents the physics<BR>close
enough to analyse the heat transfer with:<BR><BR>Case 1, pipe work embedded
in the horizontal ceiling and coffer (with the<BR>coil inside the
coffer following the slope of the coffer)<BR>Case 2, pipe work
embedded in horizontal slab only<BR><BR>Many thanks for your effort in
advance!<BR><BR>Best Regards,<BR><BR>Christian<BR><BR><BR><BR>This message
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<P></X-SIGSEP><FONT color=#808080><B>Isabelle
Bruyère<X-TAB> </X-TAB><X-TAB> </X-TAB><X-TAB> </X-TAB><X-TAB> </X-TAB><X-TAB> </X-TAB><X-TAB> </X-TAB><BR></B>Université
Catholique de Louvain
<X-TAB> </X-TAB><X-TAB> </X-TAB><X-TAB> </X-TAB>Place
du Levant, 1 à 1348 Louvain-la-Neuve<BR>Unité d'architecture - Architecture et
Climat<X-TAB> </X-TAB><X-TAB> </X-TAB>Tél
: 010/47 21 38 - Fax : 010/47 21 50<BR>
<DIV align=center><A href="http://www-climat.arch.ucl.ac.be/"
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