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

Thanks, I found the ‚problem wall’. It was a double glazing with an air layer. After changing the construction also the error with PREBID was solved.

Regards, Nikolai

Nikolai Artmann

3-Plan Haustechnik AG, Winterthur
Telefon 052 / 234 70 66
Telefax 052 / 234 70 60
e-Mail: nikolai.artmann@3-plan.ch

Von: Marshall L Sweet/sweetml/O/VCU [mailto:sweetml@vcu.edu]
Gesendet: Donnerstag, 16. Juli 2009 17:08
An: trnsys-users@cae.wisc.edu
Betreff: Re: [TRNSYS-users] [SPAM] - HELP: Error creating the wall transfer coefficients - E-Mail in Betreffzeile gefunden

I have figured out a partial solution. The wall that is causing the error is never listed in the INF file. Thus look to see what walls a transfer coefficient were found. Whatever wall is not in the INF file but is used in your type 56 is the 'problem' wall. I removed the 'problem' wall completely and used a different but similar wall. I also noticed that if the problem wall had a low capacity, and had a boundary condition then that error would occur.

And yes, the error regarding the wrong version of PREBID is related to this error.

Let me know of any solutions you come up with.

Thanks,
Marshall

-----"Nikolai Artmann" wrote: -----

To: "Marshall L Sweet/sweetml/O/VCU" <sweetml@vcu.edu>, <trnsys-users@cae.wisc.edu>
From: "Nikolai Artmann" <nikolai.artmann@3-plan.ch>
Date: 07/16/2009 04:13AM
Subject: AW: [SPAM] - [TRNSYS-users] HELP: Error creating the wall transfer coefficients - E-Mail in Betreffzeile gefunden

Hello Marshall

I am getting the same error message. Have you found a solution for this?

Also, there are no inputs or outputs to/from Type 56.

When I try to update the building variable list, I get the following message:

This INF file seems to be created with a wrong version of PREBID.

Is this related to the problem with the wall transfer coefficients?

Thanks, Nikolai

Nikolai Artmann

3-Plan Haustechnik AG, Winterthur
Telefon 052 / 234 70 66
Telefax 052 / 234 70 60
e-Mail: nikolai.artmann@3-plan.ch

Von: Marshall L Sweet/sweetml/O/VCU [mailto:sweetml@vcu.edu]
Gesendet: Dienstag, 14. Juli 2009 18:11
An: trnsys-users@cae.wisc.edu
Betreff: [SPAM] - [TRNSYS-users] HELP: Error creating the wall transfer coefficients - E-Mail in Betreffzeile gefunden

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