Let's explore the Exhibit Hall...
The exhibit hall is an open atrium with insulated walls and roof, a brick floor, two benches, and a human occupant resting on the bench (it's been a long day, and he's checking out the Mummy exhibit while the wife and kids visit the gift shop).
There is also a part for the air that fills the exhibit hall. (We created this in the BIM/CAD model, but it's just as easy to "cap" the openings and let Autodesk® CFD do the work for you.)
Ventilation air enters through a high-wall supply on the back wall and exits through a floor-level return, also on the back wall:
The back wall is an internal wall shared with another room that is not included in the model.
Temperature Swings...
Our exhibit hall is in a part of the country that is subject to some pretty severe temperature variations. In the summer, the high temperature reaches 100 °F, and in the winter, the low dips to 25°F. These outdoor temperature extremes define the two design days of the ventilation system. Obviously if the curators of the museum want to ensure good attendance, they have to keep the occupants comfortable throughout the year.
For the Summer scenario, the ventilation system supplies 64 °F cooling air to the hall; for Winter, the system supplies 85 °F heating air.