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Carbon dioxide (CO 2 ) can reduce cognitive abilities at higher concentrations. CO 2  can be used as a proxy for gas transport in an indoor environment and as an index to determine Indoor Air Quality (IAQ). In the present work, CO 2  transport inside a real university classroom has been analysed experimentally and numerically. The main novelty is related to the experimental characterization of the airflow, boundary conditions for swirl diffusers and CO 2  transport occurring in an actual university classroom equipped with a Turbulent Mixing Airflow (TMA) system. The numerical methodology, validated against the experimental measurements performed by the authors, has been used to identify the most suitable turbulence model for both thermo-fluid dynamic and CO 2  transport simulations. Three different RANS k-ε turbulence models have been compared: the Standard k-ε, the RNG k-ε and the Realizable k-ε. Moreover, the evacuation time and the effects of turbulent diffusivity have been analysed.

Experimental and numerical analysis of CO 2 transport inside a university classroom: effects of turbulent models