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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>You could try even
smaller time-steps, I’ve models with timestep: 0,03125 (n=5), 0,015625 (n=6)
and even 0.0078125 (n=7). It just takes a while before it’s finished
calculating.<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>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Kind regards,<o:p></o:p></span></font></p>
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<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>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Mariëlle <o:p></o:p></span></font></p>
<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><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'>
frodriguezpc@labein.es [mailto:frodriguezpc@labein.es] <br>
<b><span style='font-weight:bold'>Verzonden:</span></b> maandag 27 september
2010 9:11<br>
<b><span style='font-weight:bold'>Aan:</span></b> Mariëlle Nuchelmans<br>
<b><span style='font-weight:bold'>CC:</span></b> <st1:PersonName w:st="on">trnsys-users@cae.wisc.edu</st1:PersonName><br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> Re: [TRNSYS-users]
digging into trnflow convergence problems</span></font><o:p></o:p></p>
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12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'>Thanks Mariëlle,</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>I
have unsuccessfully tried several timesteps, from 0.0125 of an hour, to 0,1 and
even one hour, which are obviously too large. The only way I can get the
simulation finished is to input very large limit velues for warning and
errors...</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>I
am curious about this thing with interior and exterior temperatures, and was
wondering if some conclusions about stack performance could be extracted from
this...</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Thanks,</span></font>
<br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Francisco
Rodríguez Pérez-Curiel<br>
<br>
TECNALIA-Construcción<br>
Parque Tecnológico, Edificio 700. E-48160 Derio (Bizkaia) (SPAIN)<br>
Tel. +34 94 607 33 00, Fax. +34 94 607 33 49<br>
francisco.rodriguez@tecnalia.com,<br>
www.tecnalia.com<br>
<br>
**************** AVISO LEGAL **************** DISCLAIMER
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<br>
<o:p></o:p></p>
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<p class=MsoNormal><b><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif;font-weight:bold'>Mariëlle Nuchelmans
<M.Nuchelmans@chri.nl></span></font></b><font size=1 face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif'> </span></font><o:p></o:p></p>
<p><font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:
sans-serif'>27/09/2010 08:08</span></font> <o:p></o:p></p>
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<p class=MsoNormal align=right style='text-align:right'><font size=1
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<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif'>"frodriguezpc@labein.es"
<frodriguezpc@labein.es>, "<st1:PersonName w:st="on">trnsys-users@cae.wisc.edu</st1:PersonName>"
<<st1:PersonName w:st="on">trnsys-users@cae.wisc.edu</st1:PersonName>></span></font>
<o:p></o:p></p>
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<p class=MsoNormal align=right style='text-align:right'><font size=1
face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>cc</span></font><o:p></o:p></p>
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<p class=MsoNormal align=right style='text-align:right'><font size=1
face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>Asunto</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif'>RE: [TRNSYS-users] digging into trnflow
convergence problems</span></font><o:p></o:p></p>
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style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
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<br>
<br>
</span></font><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:navy'>Maybe you have already tried it, but you can make
your simulation time step smaller (in steps of 1/(2^n))</span></font> <br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> </span></font> <br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Kind regards,</span></font> <br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> </span></font> <br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Mariëlle </span></font><br>
<br>
<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'> frodriguezpc@labein.es
[mailto:frodriguezpc@labein.es] <b><span style='font-weight:bold'><br>
Verzonden:</span></b> maandag 27 september 2010 6:24<b><span style='font-weight:
bold'><br>
Aan:</span></b> <st1:PersonName w:st="on">trnsys-users@cae.wisc.edu</st1:PersonName><b><span
style='font-weight:bold'><br>
Onderwerp:</span></b> [TRNSYS-users] digging into trnflow convergence problems</span></font>
<br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
Dear all:</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
I am working on a trnflow simulation (an apartment with passive stack
exhausts), and having some convergence problems. After looking at it I have
found these problems occur whenever the outside temperature gets significantly
higher than the interior temperature, as you can see in the attached image. Any
suggestion on how to deal with this?</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
Thanks,</span></font> <br>
<br>
<img width=600 height=360 id="_x0000_i1025"
src="cid:image001.gif@01CB5E26.68D7EA60"><br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
Francisco Rodríguez Pérez-Curiel<br>
<br>
TECNALIA-Construcción<br>
Parque Tecnológico, Edificio 700. E-48160 Derio (Bizkaia) (SPAIN)<br>
Tel. +34 94 607 33 00, Fax. +34 94 607 33 49<br>
francisco.rodriguez@tecnalia.com,<br>
www.tecnalia.com<br>
<br>
**************** AVISO LEGAL **************** DISCLAIMER
******************<br>
Este mensaje es personal y confidencial y su uso no autorizado está prohibido
legalmente. Si usted no es el destinatario, proceda a borrarlo, sin reenviarlo
ni conservarlo.<br>
This message is personal and confidential, unauthorised use is legally
prohibited. If you are not the intended recipient, delete it without resending
or backing it.<br>
**************************************************************************************</span></font>
<o:p></o:p></p>
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