Question-and-Answer Resource for the Building Energy Modeling Community
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I'm wondering if you could approximate this with a VAV AHU with series fan powered boxes. That also can have return air (in the case of SFP boxes it is local plenum air) used for reheating the cooled air from the cooling coil. You would just need to think through what you would need to hard code to make it work like you want.
For example, if your system is constant volume and only has two fans but more than two zones, you would need to set the main primary fan to have zero power and a minimum flow fraction of 1.0 and spread the SA1 fan power evenly between your interior zone SFP terminals and SA2 fan power evenly between your exterior zone SFP terminals.
