Pollutant and heat removal of a small fire in a cinema hall by different ventilation systems.

This paper investigates the effects of chair burning on the concentration of toxic gases and heat exhaust in a cinema hall. Different ventilation systems, including displacement ventilation (DV), impingement jets ventilation (IJV), stratum ventilation (SV), and hybrid ventilation (combination of displacement and stratum ventilation) were considered in this study. Large Eddy Simulation (LES) of the turbulent flows was performed using Pyrosim software. Concentrations of the toxic gases (CO and CO2) and the heat generated by the fire in the exit doors have been discussed in detail. Concentrations of the generated toxic gases from the fire in all three systems were within the permissible safe ranges. However, among the tested systems, displacement ventilation and impingement jet had better results. Displacement ventilation could decrease the concentrations of soot by 31%, CO by 16%, and CO2 by 11% rather than stratum ventilation. The maximum concentrations of CO and CO2 were 6.35 ppm and 335 ppm, respectively, in the displacement ventilation system. For the stratum ventilation, the concentrations of CO and CO2 were reported 7.5 ppm and 370 ppm, respectively. Using the displacement and the impingement jet ventilation systems, the heat exhaust from door #1 and door #2 are, respectively, 66.6%, and 96% lower than those obtained by the stratum ventilation system. [ABSTRACT FROM AUTHOR]