负担多个防烟分区的机械排烟系统优化设计

Optimal design for mechanical smoke exhaust system of multiple smoke prevention zones

通过分析GB 51251-2017《建筑防烟排烟系统技术标准》第4.6.4的条文说明,发现按照此方法确定的风量设置风管及风口的尺寸,在实际运行中会超速不满足规范要求,通过分析风机性能与管网特性曲线,可通过设置调节阀使每个支路所组成的排烟系统的管网阻力与风机性能曲线适配,在不增加风管及风口尺寸的情况下满足规范要求。

By analyzing the provisions of 4.6.4 of GB 51251-2017 "Technical standard for smoke management systems in building", it is found that air duct and the size of the air setting according to the air volume determined by this method will exceed the speed in actual operation and will not meet the specification requirements. By analyzing the fan performance and the pipe network characteristic curve, setting the control valve makes the pipe network resistance of the smoke exhaust system composed of each branch match the performance curve of the fan, which can meet the specification requirements without increasing the size of the air duct and the size of the air.