Isothermal Modeling of Perforated Duct Diffusers (PDD)

In this study, a numerical model has been developed to characterize a room air distribution using the perforated duct diffusers (PDDs). The study is limited to the isothermal mode with no consideration of buoyancy forces, wall radiations, convection flows, etc. The numerical simulations have been compared against experimental measurements (not shown here), and the most proper index was used to indicate ventilation performance. The CFD simulations were performed by using the commercial ANSYS Fluent software. The results indicate an improvement in the air distribution inside the room using PDD. Furthermore, by analyzing different comfort indices such as terminal velocities, the discomfort zones have been determined in the occupant zone. Keywords-isothermal; numerical modeling; perforated duct diffuser; air ventilation; air distribution pattern.