[TRNSYS-users] Coldbridge effect and mixed geometry model

[hotline]

Dear Verdiana,


1)      To add a new wall and keeping the possibility of using the detailed radiation computation. You have to export the

TRNBuild model to an idf File and add the wall in SketchUp. Afterwards you can re-import and define

the wall as a coldbridge.



2)      The shm file is used, when it exists (and when it is named as your b17 file) , no matter if you choose the 3D Mode, the mixed mode or manual mode. You can check in the list file if the shm file is used, this message will occure.

*** Notice at time        :         0.000000

    Generated by Unit     :    14
    Generated by Type     :    56

    Message               : Shading mask file *.shm  for external windows exists and will be used.

The difference is that vfm and ism matrices can't be used in the mixed mode.

Regards
__________________________________________________________________________________________________

Jochen Lam
TRNSYS Software Team

Transsolar Energietechnik GmbH
Curiestraße 2
70563 Stuttgart
Fax:        +49 711 67976-11
Email:    jlam at transsolar.com<mailto:jlam at transsolar.com>
Web:      www.trnsys.de<http://www.trnsys.de>

Von: trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] Im Auftrag von Verdiana Russo
Gesendet: Montag, 10. März 2014 17:00
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] Coldbridge effect and mixed geometry model

Dear TRNSYS Users,

I have two questions about building simulation.


1)      I would like to introduce some coldbridge effects in a building model, created with Trnsys3D-SketchUp.

As I see, a way to do it is to add a new wall to the zone, and define it as Coldbridge.

To do this, the program asks me to change the geometry model from "3D" to "manual" or "mixed".

But in this way I lose the possibility to simulate with detailed internal and external radiation mode.



Do you know if there is another way to consider coldbridge effects, which functions with detailed radiation mode?

Is there anyone who tried to do it?



2)      In Volume 5 of the TRNsys Manual the difference between "3D", "manual" and "mixed" geometry mode is explained.

In "mixed" mode it says that only detailed external shading is considered.

As I understand from this, if I use this mode, I should need the shading matrix file to run the simulation and to consider external shading.

But I tried to run the simulation pulling out the .shm file from the folder where the .b17 file is, and the simulation runs without errors.

So I think that it does not need .shm file to function.

I pulled out the .ism, .shd too, and I see that it does not use them too.



So, my question is: how does "mixed" mode consider detailed external shading?


Thanks and best regards,

Verdiana Russo
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