Regarding the airflow in input, I believe with Ideal Air Loads the most appropriate input would be the Outdoor Inlet Flow rate, for a theoretical balanced system that only handles outdoor air supply and zone extract.
So shouldn’t be as I previously thought:
Internal Supply fan + Outdoor Supply fan*2
otherwise this would give the power of three systems running in parallel for AC supply, Outdoor Air
Very interesting, that makes sense to me.
I feel like I’m missing something obvious here, but can you explain why you take the average of the Supply and Extract fans (multiply by 0.5), and not the sum?
S