Mold Simulator - Tutorial 2


Wall/window thermal bridge analysis



Linear thermal transmittance of a wall/window thermal bridge will be computed in the next paragraphs. example7.mos example file will be used in order to understand fundamental aspects of this analysis.


1- Introduction

We suppose to already have thermal transmittance (Uf) of window and also linear thermal transmittance (ψ) of frame/glazing's thermal bridge.

These values have previuosly been computed using the methods stated in EN ISO 10077-2.


Uf = 1.087 W/m²K


2- Section elements

Please open file “example7.mos”, located in documentation's “samples” folder.




Note three section elements; from left to right:




3- Boundary conditions




Since norm ISO 13788 specifies different surface resistances, depending on whether we're analyzing walls or windows, it's necessary to use four different boundary conditions: internal/external window and internal/external wall.

In this situation “internal window” and “internal wall” are part of the same environment, the same for “external window” and “external wall”. To make sure that Mold Simulator identifies just two environments, boundary grouping must be by temperature and “internal window” and “internal wall” must have identical temperatures, the same for “external window” and “external wall”.

We're now ready to perform simulation and obtain thermal bridge's ψ value.