Temperature distribution horizontal cross section of a ventilated brick veneer-wall

[Katinka Rossebø]

Hello,

I’m looking for some guidance regarding modelling walls that are ventilated. In particular brick veneer-facades.

Attached are to models and results of the same horisontal section of an interior concrete wall that is leaping into the outer wall that has a ventilated brick veneer. (The dark blue area is a steel bracket that is supposed to bear the load of the brick veneer). As this steel element goes continuously thtrough all the wall insulation I wanted to check the potential thermal bridge.

However, the resulting temperature distributions differs between the two models, and I would like to know if I have made any mistakes in my assumptions? Or maybe just how you would recommend doing it?

Model no. 1- excl. the brick veneer accodring to ISO6946:2017 6.9.4 using Rse = Rsi = 0,13. (assuming well ventilated)

Model no 2- all layers modelled, including the air layer of 25 mm, using standard Rse = 0,04. (NB! modelled the air layer as the picture below)

Thank you in advance!

Katinka