Effects of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber for ventilation duct systems

Plenum chambers are common devices used for flow and pressure equalization in ventilation air conditioning systems. Aiming reducing energy consumption improving performance, the optimal cross-sectional aspect ratio ( W/H ) length L of single-path unlined rectangular plenum chamber is obtained through authors’ preliminary research. In this study, based on analysis interior characteristics chamber, it shown that traditional configuration commonly engineering not an ideal structure can achieve uniform distribution. The multi-orifice plate proposed to add inside improve uniformity. Under two typical design schemes =1/1 5/1, effect with different geometric parameters distribution investigated, installation position aperture rate orifice proposed. optimized designed be 30% both configurations. When =1/1, recommended install at y/L =0.1, as =5/1, =0.3 preferred. Besides, fluid equalizing verified under four ducts specifications engineering.