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<DIV><FONT size=2 face=Arial><SPAN
class=701111515-03122009>Hello!</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=701111515-03122009></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>At the moment I'm
simulating a 5-zone-model of a Building.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>Two of the rooms are
equipped with in sum three heating-grids (modelled through active layers) (more
heating grids will be required in future)</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>The timestep is 0.25
hours.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>The
inlet-temperature of the active layers is controlled by an
iterative-feedback-controller in that way, that the average between the inlet-
and the outlet-temperature is equal to the surface-temperature of the wall
containing the active-layer.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>Simulation only one
room with only one active-layer of this kind the simulation worked
perfectly.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>When I transferred
the described system to the five-zone-model I got the following error
approximately at hour 90:</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009>"<SPAN
class=627083913-26112009>(TYPE56) Convergence of COMIS-TRNSYS not attained
within 50max. number of internal iterations!"</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>(Respectively the error that this warning occurred to
often).</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009></SPAN></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>Varying the Tolerances, the timestep and the maximum
number of iterations in the SimulationStudio didn't solve the
Problem.</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>A reduction of the TimeBase is not possible due to the
stability-criteria of the BuildingType is no longer
fulfilled.</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009></SPAN></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>My conclusion (?) is that the maximal number of
iterations within TYPE56 is independent from maximal number of iterations in the
TRNSYS-Deck and this number is' maximum 50.</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>That this might not be sufficient for a case as complex
as the case at hand seems reasonable.</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009></SPAN></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>Is there a possibility to increase the maximum number
of iterations within Type56 eg. are there any further
suggestions?</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009></SPAN></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>Thank You!</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009>With kind regards,</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=701111515-03122009><SPAN
class=627083913-26112009> Matthias
Kersken</SPAN></SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV class=Section1>
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style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">---</SPAN></P>
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style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 3pt; PADDING-LEFT: 3pt; PADDING-RIGHT: 3pt; BACKGROUND: white; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 3pt; mso-border-alt: solid windowtext .5pt">
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style="MARGIN: 0cm 0cm 4.5pt; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><B><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Dipl.-Ing. Matthias
Kersken<BR></SPAN></B><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Wissenschaftlicher
Mitarbeiter / Abteilung Energiesysteme<o:p></o:p></SPAN></P>
<P
style="MARGIN: 9pt 0cm 0pt; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Fraunhofer-Institut für
Bauphysik <BR>Institutsteil Holzkirchen</SPAN><o:p></o:p></P>
<P
style="MARGIN: 0cm 0cm 0pt; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Fraunhoferstraße
10<BR>83626 Valley</SPAN><o:p></o:p></P>
<P
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style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">eMail: <A
href="mailto:Matthias.Kersken@ibp.fraunhofer.de">Matthias.Kersken@ibp.fraunhofer.de</A><BR>Telefon
08024 / 643-204<BR>Telefax 08024 / 643-366<BR><A
href="http://www.ibp.fraunhofer.de/">www.ibp.fraunhofer.de</A></SPAN><o:p></o:p></P></TD></TR></TBODY></TABLE>
<P
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<P
style="MARGIN: 0cm 0cm 4.5pt; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><B><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB>Dipl.-Ing. Matthias Kersken<BR></SPAN></B><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB>Research Associate / Department Energy Systems
</SPAN><SPAN style="mso-ansi-language: EN-GB"
lang=EN-GB><o:p></o:p></SPAN></P>
<P
style="MARGIN: 9pt 0cm 0pt; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB>Fraunhofer Institute for Building Physics <BR>Branch
Holzkirchen</SPAN><SPAN style="mso-ansi-language: EN-GB"
lang=EN-GB><o:p></o:p></SPAN></P>
<P
style="MARGIN: 0cm 0cm 0pt; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><SPAN
class=SpellE><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB>Fraunhoferstraße</SPAN></SPAN><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB> 10<BR>D-83626 Valley</SPAN><SPAN
style="mso-ansi-language: EN-GB" lang=EN-GB><o:p></o:p></SPAN></P>
<P
style="MARGIN: 4.5pt 0cm; mso-element: frame; mso-element-frame-hspace: 2.25pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-left: -9.0pt; mso-height-rule: exactly"><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB>eMail: </SPAN><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"><A
href="mailto:Matthias.Kersken@ibp.fraunhofer.de"><SPAN
style="mso-ansi-language: EN-GB"
lang=EN-GB>Matthias.Kersken@ibp.fraunhofer.de</SPAN></A></SPAN><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-ansi-language: EN-GB"
lang=EN-GB><BR>Phone +49 8024 / 643-204<BR>Fax +49 8024 /
643-366<BR></SPAN><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"><A
href="http://www.ibp.fraunhofer.de/"><SPAN
style="mso-ansi-language: EN-GB"
lang=EN-GB>www.ibp.fraunhofer.de</SPAN></A></SPAN><SPAN
style="mso-ansi-language: EN-GB"
lang=EN-GB><o:p></o:p></SPAN></P></TD></TR></TBODY></TABLE>
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lang=EN-GB><o:p> </o:p></SPAN></P>
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lang=EN-GB> <o:p></o:p></SPAN></P>
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lang=EN-GB><o:p> </o:p></SPAN></P>
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lang=EN-GB><o:p> </o:p></SPAN></P>
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