I know EE4 is a dated software, none-the- less I am trying to model a displacement ventilation system in a school and not sure exactly the best practice. Does anyone have any rules-of-thumb regarding the appropriate design fan power de-rating for systems using displacement ventilation?
There may not be a lot of EE4 users on the forum yet. Can you clarify what the constraints are in EE4?
In other programs it might be possible to create an occupied zone and an unoccupied zone that allows temperature stratification to take place, where otherwise the program assumes a "well mixed zone" as we say. Then, some portion of the heat gain from occupants or equipment might be assumed to be going directly to the unoccupied zone.
Another common issue in the simulation is that you need to account for an accurate air supply and return pressure drop. Also the supply air temperature may be warmer than other conventional VAV systems allowing efficiencies back at the cooling equipment.
If this will be an underfloor system, one of the construction issues is the air-tightness of the plenum and ability to deliver to all portions of the floorplate, and from occupants obstructing their vents...this is difficult to account for.
Hopefully this helps you find a workaround. If not, let us know what the specific constraints are in EE4 and maybe someone will have an idea for you.
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@DanielH I am combining "displacement" and "ventilation" into a single tag, "displacement-ventilation".