Abstract
This study presents a numerical analysis of how changing door size and forced ventilation flowrate affect fire suppression using water mist. Sensitivity analysis was conducted to determine the optimal grid size for FDS (Fire Dynamics Simulator), and optimal values of input parameters for CFAST were determined by comparing heat release rate (HRR) curves obtained using CFAST with those using FDS. A newly-defined time average HRR was used to synchronize the time interval of the simulation output data frames for FDS and CFAST. The FDS simulation results showed that increasing the door aspect ratio (AR) for the same opening ratio (OR) is a more beneficial way of lowering the maximum temperature and suppressing the fire early. In addition, lower levels of forced ventilation flowrate delayed the fire suppression more than natural ventilation, whereas forced ventilation with an increased flowrate of 2 m3/s suppressed the fire more quickly than natural ventilation.
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