[TRNSYS-users] HELP using TESS ground coupling library type 701 a

[Marshall L Sweet/sweetml/O/VCU <sweetml@vcu.edu>]

TRNSYS users,

I am trying to model a crawlspace that has a dirt floor underneath a home in type 56.  I am now trying to use the Tess Ground Coupling Library type 701a to model my basement.

I have created the one wall type with layers for the four sides and defined them as BOUNDARY walls.  I have also created a wall for the floor that has one layer (sand_gravel since it was the closest thing I could find in the American library) which is .01 meters thick and also defined as a BOUNDARY.  When I try to save the .bui file in TRNBLD I get an error "error creating wall transfer function coefficients."  I need to not have this error so I can look at the .inf file to see the U values that need to be entered into the parameters for type 701.  Why am I getting this error for any wall I have defined as BOUNDARY?  I have been following the .pdf description file of type 701 but I can't figure out how to use this type.

Also, what is the different between the first U value listed in the .inf file and the second U-wert value?  I know that the units between the two U values differ, and the U-wert value is the total U value given within TRNBLD.  When I convert the U-wert value to the same units as the first U value listed, I get different values.

Thanks,

Marshall