Development of a scaled model for the experimental study of air flow patterns in a conditioned indoor space

ABSTRACT A laboratory model of a real warehouse was designed and operated to study the flow patterns generated by its conditioning systems when operated in isothermal conditions. The systems includes a central distribution located near the roof, composed by a long horizontal cylindrical duct with many small holes on its two sides to distribute the fluid, and four outlets at the lower corners of the square floor. The model is scaled down 1:10, and water is used as model fluid to respect the fluid-dynamic similitude. Laser Sheet Visualizations and Particle Image Velocimetry are successfully implemented to describe qualitatively and quantitatively the flow pattern. The velocity maps show that the two lateral jets merge in one central jet directed downward, and two large counter-rotating vortices are formed on its sides. The flow has a strong 3D structure, and often an asymmetry can be present among the two sides of the ambient. The processing of the velocity data allows to calculate many useful parameters. The velocity distribution histograms are used to describe the ability of the system in keeping the air movement and mixing in the whole ambient, and to evaluate the comfort in the occupied zones. The induction coefficient, obtained by the integration of the velocity, is calculated at different vertical distances from the distributor. The developed systems shows big potential in the parametric study of conditioning systems, thanks to its small dimensions, lower costs, easier and faster parameter change when compared to a real scale indoor space.