Hello All,
I am modelling a MAU system providing the ventilation air to
the ~ 300 heat pumps located through out a 14 -storied building. The MAU has
a cooling coil and a heating coil and so It initially tempers the outside
air. The MAU air is even more tempered by heat pumps to maintain the space
temperatures in the zones.

How can I model this system - combination of a MAU unit and heat pumps?.
This is a case of cascading HVAC systems. Any comments/help on this
modelling case would be appreciated.

Thanks,
Kazim