Impact of the Inlet Flow Angle and Outlet Placement on the Indoor Air Quality

This study aims to optimize the influence of the inlet inclination angle on the Indoor Air Quality (IAQ), heat, and temperature distribution in mixed convection within a two-dimensional square cavity filled with an air-CO₂ mixture. The air-CO₂ mixture enters the cavity through two inlet openings positioned at the top wall, which is set at the ambient temperature (T_C). Three values of the Reynolds numbers, ranging from 1000 to 2000, are considered, while the Prandtl number is kept constant (Pr = 0.71). The temperature distribution and streamlines are shown for Rayleigh number (Ra) equal to 10⁴, three inlet inclination angles ϕ (0, π/6 and π/4) and three CO₂ concentrations values (1500, 2500, 3500 ppm) applied at both hot vertical walls (maintained at a constant temperature T_H). A finite volume method is used under the assumption of two-dimensional laminar flow to solve the Navier-Stokes and energy equations. The results indicate that inlet inclination angle has an impact on the indoor air quality (IAQ), which, in turn, affects the heat transfer distribution and thermal comfort within the cavity.