摘要
确定正压送风系统的分析工况,最关键是确定楼梯间及其前室的同时开门数。以公式计算疏散层数为n时开启门个数不超过m的概率,折算疏散时的开门数;计算开门角度的概率,折算出计算所用的开门角度;考虑开门数和开门角度评估正压送风系统。给出计算自然排烟条件下所需通风面积的公式,若实际通风面积小于公式计算所得的所需通风面积,则必须采取机械排烟。临界门洞风速以公式计算得出,加压区域正压范围根据规范选取。
The most important thing to conllrm rne anaiy^l~ scene of positive pressure mechanical air supply system is to confirm the number of opened door of staircase and atria. The probability that less than rn doors opened in n floors was calculated by formula to compute the number of opened door in evacuation. The probability of opened angle of door was calculated to compute the opened angle of door for formula. The positive pressure air supply system was evaluated consider of number and opened angel of opened door. The formula for calculate the vent area under the condition of natural smoke exhaust was put forward. Mechanical smoke exhaust must be used if the practical vent area is smaller than the needed vent area by calculated. The critical vent gas speed was calculated by formula and the pressure in pressed area was taken according the code.
出处
《消防科学与技术》
CAS
北大核心
2009年第8期580-584,共5页
Fire Science and Technology
关键词
建筑防火
性能化设计
烟气控制
安全评估
building fire prevention
performance-based design
smoke control
safety evaluation
