Study on ventilation performance and indoor air quality of a portable classroom: field measurement and numerical simulation.

This paper describes an investigation into the ventilation performance and the indoor air quality of a portable classroom. Both field measurements and numerical simulations based on CFD (Computational Fluid Dynamics) technology were used. Field measurements in an unoccupied classroom used smoke to visualize the flow pattern, and hot-film probes to quantitatively measure air velocity. These field measurements provided the boundary conditions for CFD simulations and the experimental data to examine the accuracy of the CFD simulations. A CFD simulation of the unoccupied classroom showed good agreement with the field measurements. Additional CFD simulations were then conducted to predict the flow patterns and the distributions of the age of air and C02 concentration that would occur in the occupied classroom. The results indicated that the air environment in the portable classroom needed to be improved.