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<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial>Dear Axel,</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial></FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial>the reason for this behaviour is the TIMEBASE definition required for
the TRANSFER FUNCTION CALCULATION.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial>If you decrease the TIMEBASE in the TRNBUILD -> PROJECT - >
OUTPUT window then these steps get away.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial>But you have to consider that the TIMEBASE has to be 1,2,... times of
the simulation time step and it can be that after changing the
value</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial>you get an error message that the coefficients for certain walls
couldn't be generated. Then you'll have to increase the timebase
again.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><SPAN class=390313112-20042011><FONT size=2
face=Arial>It is always recommended to keep the Timebase as close as possible to
the simulation time step.</FONT></SPAN>
</DIV>
<DIV dir=ltr align=left><FONT size=2 face=Arial></FONT>
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<DIV dir=ltr lang=de class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>Von:</B> Axel.Oliva@ise.fraunhofer.de
[mailto:Axel.Oliva@ise.fraunhofer.de] <BR>
<B>Gesendet:</B> Mittwoch, 20. April
2011 12:27<BR>
<B>An:</B> trnsys-users@cae.wisc.edu<BR>
<B>Betreff:</B>
[TRNSYS-users] building type 56: performance based on
time-step<BR>
</FONT><BR>
</DIV>
<DIV></DIV><FONT size=2 face=sans-serif>
<P>Dear TRNSYS users,</FONT> <BR>
<BR>
<FONT size=2 face=sans-serif>the building
type 56 is used to generate a load profile regarding to a constant room
temperature. I experienced a different behavior of cooling and heating demand
based on the time-step selected. It seems that the building type is
extrapolating its performance within one hour, when such a smaller time-step is
selected - and correction its state, based on one hour calculations.
</FONT><BR>
<BR>
<FONT size=2 face=sans-serif>All input values like irradiation on
all surfaces contribute as a continuous function. Details are shown in the
attached .pdf file. The same issue appears in TRNSYS versions of 16 and
17.</FONT> <BR>
<BR>
<FONT size=2 face=sans-serif>The same issue has already been
discussed without detailed answering: </FONT><A
href="https://mailman.cae.wisc.edu/pipermail/trnsys-users/2008/003893.html"><FONT
size=2
face=sans-serif>https://mailman.cae.wisc.edu/pipermail/trnsys-users/2008/003893.html</FONT></A>
<BR>
<BR>
<BR>
<FONT size=2 face=sans-serif>Tanks for help</FONT> <BR>
<FONT size=2
face=sans-serif>best regards,</FONT> <BR>
<BR>
<FONT size=2 face=sans-serif>Axel
Oliva</FONT> <BR>
<FONT size=2 face=sans-serif>--
<BR>
-----------------------------------------------------------------------------<BR>
Dipl.-Ing.
Axel Oliva<BR>
Division Solar Thermal and Optics<BR>
Fraunhofer Institute for
Solar Energy Systems ISE<BR>
Heidenhofstrasse 2, 79110 Freiburg,
Germany<BR>
Phone:+49(0)761/4588-5698
Fax:+49(0)761/4588-9950<BR>
axel.oliva@ise.fraunhofer.de<BR>
</FONT><A
href="http://www.ise.fraunhofer.de/"><FONT size=2
face=sans-serif>http://www.ise.fraunhofer.de</FONT></A><FONT size=2
face=sans-serif><BR>
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