Which is the best component to use to account for fritted glazing in a simple shoebox energy model?
I’ve create the geometry for the ceramic fritting which are enlarged dots modelled as coplanar to the glazing surface.
Hi @Rob,
My suggestion is to simply adjust the material properties based on your expectation of the frit. I’m sure you can find some research on the topic, but if I have to guess, I imagine frit won’t change the U value by much. I suspect the main change would be blocking/diffusing direct radiation, which you should be able to represent by changing the SHGC value.
Hope it helps!
Thanks Mustapha, that’s very helpful.
Additionally, I’ve looked further into the relationship between fritting and SHGC. The frit colour has a significant influence on SHGC in addition to the density, and it seems acceptable to translate these frit properties to SHGC/g-values which some manufacturers can do on request. So for energy modelling there is no need to model fritting as you suggested.
Some time ago it happened to me too, I solved it with genbsdf and window, then using the complex fenestration states in EnergyPlus. If it’s not all over the glass or it’s patterned (as in my case) then for me you have to do more precise modeling, otherwise you might as well vary the SHGC/g values.