A numerical study of indoor air quality in a ventilated room using different strategies of ventilation

Abstract

-This study aimed to numerically investigate the air flow and contaminant dispersion in a ventilated room. The URANS equations supplemented with energy and concentration equations are solved using the scStream code. We are targeting primarily the ventilation effectiveness (εc) and the index of indoor air quality (IIAQ). Different displacement and mixing ventilation modes are investigated in isothermal conditions. The ventilation flow rate is 50 m 3 .h −1 Here, our ultimate aim is to suggest an effective ventilation that can ensure a good indoor air quality. The RN G k − ε model was adopted to handle the turbulence. CFD simulations were systematically checked, whenever possible, through available results. The simulation results indicate that the ventilation effectiveness to remove a contaminant and the index of indoor air quality are substantially influenced by the ventilation mode and the location of inlet and outlet air. From this study, it appears that the air flow and contaminant dispersion in a ventilated room can be typically predicted or evaluated by computer simulations.

Numerical simulation of the CO2 diffusion effect on low turbulent mixed convection in a ventilated room heated by the bottom

“…To check and validate our approach, the ventilated cavity under thermal buoyancy force and low-turbulent regime reported by [18] was solved. To avoid overloading the text, note that the verification and validation processes have already been presented in previous work [21][22][23][24], with satisfactory results. Likewise, the check process was completed via the problem addressed by Ampofo and Karayiannis [25].…”

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

“…It neglects the infiltration of air. The effect heat load is due to nature and forced convection currents after calculating the no-parameter Richardson number [20]. Rig characteristics were chosen per Table 10, and [21].…”

Cooling load for the design of air terminals in a general non-uniform indoor environment oriented to local requirements

“…In the steady-state CFD simulation with Airpak 3.0 software, Boussinesq approximation was used to model the buoyancy force. The RNG κ-ε turbulence model, which is widely used in mixing ventilation [44][45] , underfloor air distribution [46][47] and displacement ventilation [48][49] , was employed to consider the turbulent flow.…”