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Air quality does much to people's health. Based on measured air flow rates, effects of different ventilation and extraction conditions, including velocity, temperature of ceiling ventilation, longitudinal ventilation and extraction on air quality at subway station platform are simulated by CFD, then strategies to optimize this air quality can be (1) decrease ventilation temperature, (2) increase ventilation...
When longitudinal ventilation is activated in subway station platform fire, smoke-control effectiveness depends on ventilation effectiveness. With the ventilation motion analyzed, its time at staircase is decreased and ventilation effectiveness gets better all along platform. In case of 30 MW fire with 80 m3/s smoke volume flow rate, longitudinal ventilation of bigger than 1.5 m/s freshens platform...
Smoke-control of subway fire is always in a developing stage. In Airpak model of a subway platform, 30 MW fire is reconstructed, then along with 2 m3/(minldrm2) extraction level, 1.0~4.0 m/s longitudinal ventilation is activated to control its smoke back-layer. When ventilation velocity is not less than 2.0 m/s, temperature, mass rate of smoke and air quality stratify upstream fire source, and they...
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