On the transition from displacement to mixing ventilation with a localized heat source

For that study, the authors have investigated the steady state natural ventilation of a room heated at the base and consisting of two vents at different levels. In order to establish appropriate ventilation strategies for a room, they explored how the air flow rate and the internal temperature relative to the exterior vary as a function of the vent areas, the heat load and the vents position. It appears that the appropriate ventilation for a room in winter conditions is mixing ventilation, whereas displacement ventilation is more suitable for warmer external exposures.