摘要
机械加压送风是建筑物疏散通道最常见的防烟方法,机械加压送风量最常用的计算方法是压差法和风速法。通过具体的工程计算,对机械加压送风量的门洞风速计算方法进行研究,分析背压系数、门洞风速取值不同时送风量的变化情况,并把计算结果和同等情况下的规范规定值相比较。研究发现,参数取值的变化对风速法计算送风量的结果影响很大,计算结果的范围比同等条件下《高层民用建筑设计防火规范》的取值范围宽很多。在背压系数较小或门洞风速较大时,风速法计算风量多大于规范规定风量,此时进行机械加压送风量计算可直接采用风速法计算得到。
Mechanical air supply method is the most common smoke proof method used in stairwell to control the spread of smoke.Pressure difference method and wind speed law are commonly used in engineering design calculation of mechanical smoke control volume flow rate.The wind speed method was studied by specific engineering calculation.Then the changes of mechanical smoke control volume flow rate under different back pressure coefficient and doorway wind speed were analyzed and the results were compared with the regulation provision of same conditions.Results showed that the changes of parameter values affect the calculation results of volume flow rate significantly and the value range obtained from wind speed method is wider than codes provision.When the value of back pressure coefficient is smaller or the value of doorway wind speed is larger,the mechanical smoke control volume flow rate provided by wind speed method is always greater than regulation provision.So,wind speed method can be applied when calculating mechanical smoke control volume flow rate.
出处
《消防科学与技术》
CAS
北大核心
2010年第11期958-961,共4页
Fire Science and Technology
基金
中国科学技术大学火灾科学国家重点实验室开放课题"高层建筑机械加压送风计算方法的理论与实验研究"(HZ20009-KF09)
关键词
机械排烟
安全疏散
加压送风量
风速法
mechanical smoke control
evacuation
mechanical smoke control volume flow rate
wind speed method
