[TRNSYS-users] Editing Surface Values in .b17 Building File

[Marion Hiller]

Daniel,

In general it is not recommended to edit the b17.
However, if you edit something manually it is mandatory to check if TRNBuild completely "understands" your changes.

The following is recommended:


  *   Open the edited b17 file in TRNBuild
-> TRNbuild does some checking like for adjacent surfaces an equal area check  and a front/back check
  However, TRNBuild doesn't prompt an error in general if a syntax error exists.
  If TRNBuild doesn't "understand" something it ignores it and uses a default value instead.
  Therefore, double check the differences by comparing the input b17 file with a saved b17 file from TRNBuild.

  *   In TRNBuild set the zone geometry mode to "MANUAL" because the vertices and polygons doesn't match to the surfaces areas
-> This will remove the  3D information and makes clear that there is no 3D data available.

  *   Remove all existing shading / insolation matrices (*.SHM and *.ISM) for these zones. They are no longer valid.

Kind regards,

Marion


Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> Im Auftrag von David BRADLEY via TRNSYS-users
Gesendet: Donnerstag, 9. August 2018 18:57
An: TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc: David BRADLEY <d.bradley at tess-inc.com>; Weber Daniel <webedani at student.ethz.ch>
Betreff: Re: [TRNSYS-users] Editing Surface Values in .b17 Building File


Daniel,

 You are brave! I edit lots of things by hand in the *.b17 (and *.b18) file but I have never tried to touch the geometry! I think you'll be okay provided that you are not trying to generate a shading mask and providing that none of your zones use the detailed radiation models.

kind regards,

 David



On 08/08/2018 18:56, Weber Daniel via TRNSYS-users wrote:
Dear TRNSYS users,

I am modelling a multizone 3D building with Type 56 and tried my luck with directly editing the .b17 building file. I have adjusted surface areas of walls, windows and roofs as well as changed wall types from external to adjacent with their corresponding surfaces.

It works fine as the simulation runs smoothly, but I am wondering about the last part of the building file where it says "_EXTENSION_BuildingGeometry_START_". It seems that all vertex points of each wall, window and roof are stored here. As I edited surface areas of walls but not their vertex points in that file, the vertex points resulting area isn't the same as the changed area of the walls.

Is that somehow going to affect my simulation in any way? For what part of the simulation are the vertex points necessary? Is it not advised to edit the .b17 at all manually?

All input is greatly appreciated.

Best regards,

Daniel Weber


PS: Any input to my question about the topic "Surface Gain Inside - Pane Temp Error" in the archive would be welcomed too, where I'm struggling to implement a heat gain input to an inside surface.




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