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[EnergyPlus_Support] Mechanical ventilation for passive dwellings

In accordance to passive house and belgian standards, the mechanical ventilation is done as follows:
- a MV group with heat exchanger
- blows the (eventually preheated) air in "dry" rooms (sleeping and living rooms, offices, ...)
- takes it back from the "wet" or more polluted rooms (kitchen, bathrooms, storage rooms, ...)
- in between, the air moves by various openings, hallways, staircaises, ...

We often need to split those areas in several zones, meaning that some have an air inlet only while other have an outlet only.

Since both flows cross each other in the heat exchanger, they have to belong to the same HVAC Airloop.  The problem here is that every zone must have one inlet and one outlet.  I tought using a return plenum (a zone indeed) but only one can be used in the airloop and I have several "wet" zones.
                                |...
in---| > |--supply fan--splitter|--z1--|
     |   |                      |--z2--|--z4----|
     |HEX|                      |--z3--|        |
     |   |                                      |
out--| < |--return fan--mixer|------------------|
                             |...

The air can be moved from one zone to another using either (cross)mixing either the airflow network, I guess.

Did anyone model this ?  Do you have some suggestions ?  Any clue ?  I did not reach any efficient or fully working model yet...

Thanks in advance ...



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