Could someone let me know the main difference between simple and complex model when carrying out a Heat Loss calculation?
I can see complex model does not let you chose between setting the air or resultant temp (fixed on resultant) - but the fabric loss comes out slightly higher in complex model than when selecting resultant temp with a simple model.
The manuals would be the best resource if you wished to dig further into these calculations methods, some info from this can be found below:
There you will also find all the formulae used, eg:
Shane Regan | Principle Building Performance Support Engineer