VENTILATION SYSTEMS ENHANCEMENT IN SEMICONFINED AND CONFINED ROOMS USING STRAIGHT LOBED GRILLES

Abstract

This study presents a numerical investigation of flow behavior of a turbulent impinging jet in semiconfined and confined rooms using computing code ANSYS computational fluid dynamics. The lobed grille is proposed as a novel air diffuser design in order to develop air distribution inside the room. A comparison of the different types of diffuser geometry (elliptical, rectangular, and lobed grids) is carried out. Different discharge heights (0.3 m, 0.6 m, and 0.9 m) are taken into account. The effect of jet designs on thermal confort is investigated also. The validation results show a good agreement with the experimental data found in the literature. The flow behavior and thermal characteristics of the three designs are presented. The results show that lobed grilles enhance the ventilation systems for both semiconfined and confined rooms.