[TRNSYS-users] TRNBuild Error
jimanas at aix.meng.auth.gr
Fri Nov 25 06:23:05 PST 2005
I would like to model very thick walls. In the case I am working I have
walls around 6m! For this case, TRNSYS (i.e. TRNBuild) cannot calculate
the transfer coefficients. I have created new walls with 40cm thickness
and keeping the U-value constant by changing the thermal conductivity.
When I save the project, the following message is shown:
Error creating the wall transfer function coefficient:
Stability criteria not fullfield
Check layer definition (thickness, ratio of conductivity/density)
Please check the INF-file for further information
When I check the INF-file the same message is shown: Stability criteria
I have changed the TIMEBASE from 1 to 2 but the problem still remained.
The same was when I set TIMEBASE=3 or 4 or 5 or 6. Only when the
TIMEBASE is 7 the problem is solved but then the following message is shown:
Error creating the wall transfet function coefficients:
Unable to find a root after indication that a root exists.
Maybe the timebase is too small.
Please, check the INF-file for further information
If I set the TIMEBASE around 100 the above message still remain.
What can I do to work around this problem?
Dipl. Mechanical Engineer
Laboratory of Heat Transfer and
Aristotle University Thessaloniki
Box 483 54124 Thessaloniki, GREECE
Tel: + 30 2310 996048
Fax: + 30 2310 996012
e-mail: jimanas at aix.meng.auth.gr
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