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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dear all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>I have an atrium with
temperature controlled (on/off) natural ventilation in TRNSYS with TRNFLOW. I
use a 3stage room thermostat type 8b to control ventilation openings at the roof
and on the 1st floor. The control signal of the type 8 gives stranges results
though and tends to oscillate for no appearant reason. When I use Powells
method, the signal is okay but somewhere halfway the simulation (begin of
summer), I get error 206 at multiple times:<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><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='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>TRNSYS ERROR # 206<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>THE SOLUTION CAN NOT BE
FOUND AT TIME 2532.62<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>Finally resulting in<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>TRNSYS ERROR # 204<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>THE NUMBER OF
UNSUCCESSFUL TIMESTES EXCEEDS LIMITS<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>Does anyone have an
idea what can be wrong? Decreasing the timestep has no effect; application of a
deadband also does not help; the errors occur earlier in the simulation when I
use a larger deadband...<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>Kind regards<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Courier><span
lang=EN-GB style='font-size:10.0pt;font-family:Courier'>Stefan de Kool<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=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 style='font-size:10.0pt;
font-family:Arial'>Cauberg-Huygen Raadgevende Ingenieurs</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Lokatie Rotterdam<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><img width=211 height=32 id="_x0000_i1025"
src="cid:image002.gif@01C646B9.20400B40"><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>
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