Question-and-Answer Resource for the Building Energy Modeling Community
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Personally, I'd combine the two systems into one and model one system with one zone for the dining area. The systems are likely similar, and are serving the same type of area. You'd just have to make sure your fan power is where it is expected to be. I suppose it depends on how complex and accurate your model needs to be.
It seems like a lot of work to try to separate out each RTU into each zone, when in reality the air in that dining area will be constantly mixing, as there is a lot of air movement in a dining room.
