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<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>Dear Francisco,</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff><FONT
size=2 face=Arial>yes, if a window is closed the parameters "for closed
opening"</FONT> <FONT size=2 face=Arial> do apply.
</FONT></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>However, no flow occurs, when the window is horizontal and the
zone has one window only.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>The reason for this is that all cracks are at the same height
and a crack has a one directional flow only.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>For a vertical window the cracks are placed in different
heights and a flow may occur</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>Concerning the convergence problems. I assume a few not
converged time steps don't influence your results of yearly simulation
significantly.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>However, I would recommend to always check whether high flows
are realistic.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>Best regards,</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010><FONT color=#0000ff
size=2 face=Arial>Marion</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=023142910-24092010> </SPAN>
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<DIV align=left><FONT size=2><SPAN
style="FONT-FAMILY: arial; COLOR: rgb(0,90,0); FONT-WEIGHT: bold">Dipl.-Ing.
Marion Hiller </SPAN><BR style="COLOR: rgb(0,153,0); FONT-WEIGHT: bold">
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<FONT size=2 face=Tahoma><B>Von:</B> frodriguezpc@labein.es
[mailto:frodriguezpc@labein.es] <BR>
<B>Gesendet:</B> Mittwoch, 22. September
2010 14:25<BR>
<B>An:</B> trnsys-users@cae.wisc.edu<BR>
<B>Betreff:</B> Re:
[TRNSYS-users] TRNFLOW convergence problems<BR>
</FONT><BR>
</DIV>
<DIV></DIV>
<P>
<BR>
<FONT size=2 face=sans-serif>Dear Marion,</FONT> <BR>
<BR>
<FONT size=2
face=sans-serif>many thanks for your answer. You are right, this morning I run a
shorter simulation and saw the problem was related to a sudden increase of
airflow caused by a window opening schedule. I run another simulation with
closed windows and it converged, but I realised I have no flow from
infiltration. I thought this was provided by the "for closed opening" parameters
in the Large Opening Type Manager. Any suggestion about that?</FONT>
<BR>
<BR>
<FONT size=2 face=sans-serif>Also, I modified my window schedule by
increasing by 0.02 the opening factor each minute and using a short (0.0125)
timestep. My simulation does not stop, but I still get some convergence
problems, probably due to very large flows in the kitchen, which also has
stack ventilation... Could some unrealistick stack parameter be the
cause?</FONT> <BR>
<BR>
<FONT size=2 face=sans-serif>Best regards,</FONT>
<BR>
<BR>
<FONT size=2 face=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>
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