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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'>Are you using a thermostate
or an equation to control the cooling? You should use an thermostate. An
equation gives a zero or an one, so it can go off/on/off/on and your program crashes
(on because it reaches setpoint and then off because wanted temperature is
reached) A thermostate has a dead band and it chooses on/off after 5
iterations. It is less accurate but your program runs.<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 style='font-size:
10.0pt;font-family:Arial;color:navy'>Good luck <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>
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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'>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 9:42<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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<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 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'>It crashes even at n=7 timestep... I am pretty sure it
has to do with this temparature thing. A check to my lst file shows this clear
pattern with lack of convergence in al the external temperature peaks, so I
turned off cooling and the result is I get convergence thanks to interior
temperatures going above exterior at most of the previous conflict timesteps...
still there are a couple times of year where I still get higher ext. temps, and
convergence problems show</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>
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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 09:18</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'>"frodriguezpc@labein.es"
<frodriguezpc@labein.es></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'>"<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
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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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<br>
<br>
</span></font><font size=2 color=navy face=Arial><span 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.</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>
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<o:p></o:p></p>
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