[TRNSYS-users] Modelisation of atrium with TRNSYS 3D

[Noé STEMART (INSA)]

Dear Trnsys users, 

I am trying to modelise thermal stratification with TRNBuild (type 56), in high volumes (like an atrium for example). To simulate this phenomena, I'm using the plugin TRNSYS 3D on sketchup to modelize a stack of zones (transformed in TRNBuild on a stack of airnodes) by assigning "VirtualSurface" to the surface between the 2 zones. This one is delated when the 3D construction is imported in TRNBuild. A simple example I’m using is a building with two levels of 5 meters each, without windows. 

I would like to know how to study stratification in TRNSYS 18. 

Will stratification be calculated automatically ?
Or do I have to put an air coupling between airnodes (which input with which equation ?) ?
Or do I change something in "Radiation modes of thermal zone" or "Geometry modes" in TRNBuild ?

Regarding radiation, will having 3 or more airnodes in the zone be problematic ?

Thanks a lot for your help,
Best regards

Noé