A study on next generation zone smoke transport model and basis of practical usage

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This study aims at improvement of the prediction methods of fire and smoke spread in buildings in connection with evacuation of occupants and activity of fire-fighters. To include wide range of fire and smoke phenomena, model scale experiments were carried out on smoke movement through horizontal ceiling vent. The onset condition of bi-directional flow was formulated. In the bi-directional regime, experimental formula was proposed for mass flow rates of air and smoke. To simulate the burning behavior of combustibles in a room, polyurethane block was burnt adjacent to wall surfaces, where they receive thermal feedback from walls. As to the sight blockage and decrease of floor luminance, the behavior of light scattering by smoke particles were measured and formulated. While the zone model is being improved, these newly developed sub-models are being implemented so that the prediction could be more realistic.