Airflow Network Duct Autosizing
Autosize the ducts in AirflowNetwork based on Manual D. Automatically sizing ducts for desired flow rates will simplify specification of more complex models. NREL residential has a Manual J OpenStudio measure, so this could be done in OpenStudio, but the current feeling is that it’d be better in EnergyPlus
As someone who works daily with duct hydraulics and simmulations thereof and an experienced e+ user, I know that both the former and the latter are "expert" areas. e+ cannot simulate all the duct configurations, componants and interactions nessesary and would have to re-invent the simple "loop" architecture that it currently uses AND become a network solver similar to EPANET Basic Hydrulics 03 | Solution of the Gradient Method.
It's doable, but a hell of a project.