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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dear Oliver,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>The cooling power also depends
on the room temperature. The quoted 40-60 W/m2 is usually specified at peak
cooling demand, usually at a roomtemperature of 25 or <st1:metricconverter
ProductID="26 C" w:st="on">26 C</st1:metricconverter>. If the room doesn’t
get that hot, the supplied cooling power is less. Usually, the aim of the concrete
cooling system is to condition the room (which is quite succesfull when <st1:metricconverter
ProductID="21 C" w:st="on">21 C</st1:metricconverter> room temperature is
achieved) and not to deliver a large cooling power. However, when a comparison with
other cooling systems is made, the maximum cooling power is sometimes used. In
my opinion, your modeling results show that for the specific project you don’t
need these large cooling powers.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards, Arie<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Van:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
trnsys-users-bounces@engr.wisc.edu [mailto:trnsys-users-bounces@engr.wisc.edu] <b><span
style='font-weight:bold'>Namens </span></b>Pol Olivier<br>
<b><span style='font-weight:bold'>Verzonden:</span></b> dinsdag 6 februari 2007
15:44<br>
<b><span style='font-weight:bold'>Aan:</span></b> trnsys-users@engr.wisc.edu<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> [TRNSYS-users] concrete
core cooling modelled with active layer</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Dear TRNSYS users,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I am modelling a concrete core cooling (activation of
storage mass of slabs) with an active layer (with TRNSYS 16.01).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Relevant data are:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>distance to edge of the
slab: 12cm<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>pipe spacing: 20cm<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>flow mass: 12kg/h.m²<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Temperature of supply air
into the rooms: <st1:metricconverter ProductID="19°C" w:st="on">19°C</st1:metricconverter><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>According to the definition of outputs for a surface,
the energy abstracted from the room into the slab should be QCOMI and QCOMO
(considering both l-wave radiation and convection).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>My results are:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo6'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>inlet temperature <st1:metricconverter
ProductID="19°C" w:st="on">19°C</st1:metricconverter>, QCOMImax=15W/m²<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo6'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>inlet temperature <st1:metricconverter
ProductID="17°C" w:st="on">17°C</st1:metricconverter>, QCOMImax=20W/m² (average
air temperature in summer: <st1:metricconverter ProductID="21°C" w:st="on">21°C</st1:metricconverter>)<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo6'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>inlet temperature <st1:metricconverter
ProductID="17°C" w:st="on">17°C</st1:metricconverter>, without cooling of
supply air, COMImax=25W/m² (average air temperature in summer: <st1:metricconverter
ProductID="22°C" w:st="on">22°C</st1:metricconverter>)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>The values I obtain for QCOMI and QCOMO are much
lower than the ones obtained in the practice (usually between 40 and 60W/m²).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I tried different variations (simulation time step,
distance to the edge of the slab, flow mass and auto-segmentation, internal
calculation of convective heat transfer coefficient, number of loops) without
success…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Are QCOMI and QCOMO the right outputs?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Thank you for your suggestions,<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Olivier Pol</span></font></st1:PersonName><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='line-height:15.0pt'><font size=1 color=black
face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial;
color:black;layout-grid-mode:line'>____________________________</span></font><font
size=1 color=black face=Arial><span lang=EN-GB style='font-size:9.0pt;
font-family:Arial;color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='line-height:15.0pt'><b><font size=1 color=maroon
face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial;
color:maroon;font-weight:bold'>arsenal research</span></font></b><b><font
size=1 face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial;
font-weight:bold'><o:p></o:p></span></font></b></p>
<h1 style='margin:0cm;margin-bottom:.0001pt;line-height:15.0pt'><b><font
size=1 color=maroon face=Arial><span lang=EN-GB style='font-size:9.0pt;
font-family:Arial;color:maroon;font-weight:normal'>Geschäftsfeld Nachhaltige
Energiesysteme / <br>
Business Field Sustainable Energy Systems</span></font></b><span
lang=EN-GB><o:p></o:p></span></h1>
<h1 style='margin:0cm;margin-bottom:.0001pt;line-height:15.0pt'><b><font
size=1 face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial;
font-weight:normal'>DI <st1:PersonName w:st="on">Olivier Pol</st1:PersonName></span></font></b><font
size=1 face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial'><o:p></o:p></span></font></h1>
<p class=MsoNormal style='line-height:15.0pt'><st1:country-region w:st="on"><font
size=1 face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial'>Austria</span></font></st1:country-region><font
size=1 face=Arial><span lang=EN-GB style='font-size:9.0pt;font-family:Arial'>,
1210 <st1:City w:st="on"><st1:place w:st="on">Vienna</st1:place></st1:City>,
Giefinggasse 2</span></font><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal style='line-height:15.0pt'><font size=1 face=Arial><span
lang=EN-GB style='font-size:9.0pt;font-family:Arial'>ph: +43 (0) 50550-6592, f:
+43 (0) 50550-6613</span></font><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal style='line-height:15.0pt'><font size=1 face=Arial><span
lang=EN-GB style='font-size:9.0pt;font-family:Arial'>mobile: +43 (0)664/ 62 07
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href="mailto:olivier.pol@arsenal.ac.at"><font size=1 face=Arial><span
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font-family:Arial;color:blue'><o:p></o:p></span></font></p>
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