Air velocities in the occupied zone were measured in a full-size, slot-outlet and slot-inlet ventilated (SOSIV), unoccupied room. The measurements were taken at different room heights with two outlet/inlet locations, five levels of outlet jet momentum, with and without floor heating. The near floor air flow in the SOSIV room possesses velocity and turbulence profiles similar to those of a fully developed wall jet. The velocity and turbulence profiles measured at the room's mid-length are similar, with each representing the mirror image of the other. A full model was proposed to predict the floor-level air velocity in the SOSIV room. For a given room aspect ratio and a given outlet-inlet location, the floor-level air velocity can be uniquely determined by the jet momentum ratio under isothermal conditions and is determined by both the jet momentum ratio and the thermal buoyancy under nonisothermal conditions. The outlet and inlet locations and the room aspect ratio can significantly affect the floor-level air velocity. The results can be applied to industrial plants and agricultural buildings.

KEYWORDS: year 1996, air flow, air flow rate, air distribution, measuring, calculating, floors, thermal comfort, vents, air inlets, turbulent flow, air movement, draughts