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依据《建筑防烟排烟系统技术规范》(送审稿),分别采用规范推荐的公式法和风速法计算仓库的自然排烟口面积,并对排烟口面积进行了比较分析。通过CFAST软件模拟自然排烟效果,根据烟气层高度和温度,综合分析评价不同计算方法的合理性。结果表明:采用公式法计算得到的自然排烟口面积小于风速法,但模拟结果显示其烟气层高度比采用风速法计算时要高,烟气层温度仅高于后者10~40℃。
According to the Technical Specifications for Building Smoke Suppression and Smoke Exhaust System (draft for review), the area of the natural exhaust port of the warehouse was calculated by the formula method and the wind speed method respectively recommended by the standard, and the comparative analysis of the exhaust port area was carried out. By CFAST simulation of natural smoke exhaust effect, according to the height and temperature of flue gas layer, a comprehensive analysis to evaluate the reasonableness of different calculation methods. The results show that the natural outlet area calculated by the formula method is smaller than the wind speed method. However, the simulation results show that the height of the flue gas layer is higher than that calculated by the wind velocity method, and the flue gas layer temperature is only 10-40 ℃ higher than the latter.