[TRNSYS-users] HELP: Error creating the wall transfer coefficients

[Matt Duffy]

Marshall,
I am not quite sure without having a look at your file. Would you please
be able to send me your *.bui?

Thanks,

Matt



----- Original Message -----
From: "Marshall L Sweet/sweetml/O/VCU" <sweetml at vcu.edu>
Sent: Tue, July 14, 2009 11:10
Subject:[TRNSYS-users] HELP: Error creating the wall transfer coefficients


TRNSYS Users,

I am using TRNBuild to create a type 56 building model.  When I save the
building I
get the following error message:

Error creating the wall transfer 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.

Upon checking the INF file the error is occurring at the end of the file
reading:

UNABLE TO FIND A ROOT AFTER INDICATION THAT A ROOT EXISTED

 CHECK THE WALL TYPE AFTER THE LAST CALCULATED WALL
 OFTEN THE WALL CAPACITY IS TO SMALL TO CALCULATE A TRANSFER FUNCTION !

 CHECK ALSO YOUR TIMEBASE !

The wall type after the last calculated wall is a ceiling consisting of
two layers
(wall_board and R-13 insulation).  I have used this exact same wall type
in other
models and it has worked fine.  The coefficients (A, B, C, and D) of the
transfer
function for this specific wall type are identical in both models.  The
timebase is
also the same.  The capacity is different but I have increased the
capacity and I am
still getting the same error.

What is going on here?  Where exactly is the capacity?  What is meant by
"unable to
find a root after indication that a root existed?"

Thanks in advance,

Marshall_______________________________________________
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----- End of original message -----