Theatre study for a natural displacement vent system

[chrysospathis]

Hello,

I have to do an overheating study for an open space theatre that has three different levels of occupancy (two balconies). Specifically, there are approximately 250 people at ground floor level, 85 people at the first balcony and 55 people at the top balcony. The proposed system is a natural displacement ventilation system.

Outside air it will be supplied at low level but before that the supplied air will pass through a concrete 'labyrinth' (floor void) in order to be cooled down during periods of occupancy. The concrete elements will be cooled down during the night cooling mode. Furthermore, the air it will be extract at high level threw stack ventilation units.

So, I would like to ask for your help in order to find the best way to simulate that system.

What I was planning to do is to divide the room in 5 different levels:

Level 1 (Floor void): On this level I will supply the outside air.
Level 2,3 and 4: Occupied areas.
Level 5: Roof space (pitched roof).

In order the supplied air to be cooled down by the concrete elements inside the 'labyrinth' space what do I have to do? I was thinking to introduce auxiliary ventilation on that lower level and to introduce openings to the ceiling to let the air pass to the above occupied areas. Is this correct?

I have three different levels of occupancy in one open space. How do you recommend me to distribute my convective gains (people, equipment, lights) occurring in those three different levels?

Any advice or suggestion it will be more that helpful.