地下汽车库排烟量计算探讨

Discussion on Calculation of Smoke Exhaust of Underground Garage

根据《建筑防烟排烟系统技术标准》(GB 51251-2017)计算汽车库设计排烟量,并将结果与《汽车库、修车库、停车场设计防火规范》(GB 50067-2014)表8.2.5规定的排烟风机的排烟量进行比较,结果表明:当燃料面距地面1 m、车库净高不大于4.18 m时,表8.2.5规定的排烟风机风量满足GB 51251-2017中设计排烟量的要求。另以广州地区设置充电设施车库的某住宅项目典型防火分区排烟系统为例,计算该车库排烟系统漏风量,漏风率约5.5%。

According to《Technical standard for smoke management systems in buildings》(GB 51251-2017), the design smoke exhaust of underground garage is calculated, and results are compared with the smoke exhaust fan given in table 8.2.5 of《Code for fire protection design of garage, motor repair shop and parking area》(GB 50067-2014),The results showed that: when the fuel surface is 1 m above the ground and the clearance height of the garage is less than 4.18 m, the smoke exhaust fan shown in the table 8.2.5 meets the design smoke exhaust required in GB 51251-2017. In addition, a case is presented to analyze the air leakage rate of the smoke exhaust system of a typical fire compartment of a residential project with charging facility garage in Guangzhou, and the air leakage rate is about 5.5 %.