最新关于地下室通风排烟.doc

关于地下室通风排烟
of rural drinking water sources, protection of drinking water sources in rural areas by the end of thm
摩擦阻力pa
①
38400
1600*400




②
33600
1600*400




③
28800
1250*400




④
24000
1250*400




⑤
19200
1000*400




⑥
14400
800*400




⑦
9600
630*400




⑧
4800
630*250





最不利环路阻力降：
△P= [△P1＋……＋△P8]*(1+K)+
=*(1+)
=248Pa
其中：△P1-8—各管段摩擦阻力
K—局部阻力与摩擦阻力的比值，
P—最不利回路阻力降，Pa
〔五〕 排风机选择计算
漏风量取8％，压力损失附加10％
L＝38400*＝41472m3/h
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
H＝248*＝273Pa
选择风量41472 m3/h，风压273 Pa排风机两台
排烟系统
〔一〕方案
车库设机械排烟系统，排烟风机的排烟量按换气次数6次/h计算确定。
进风系统采用自然补风方式，补风量为排烟量的50％。
〔二〕风量计算
车库：体积V＝12800m3 换气次数n=6
排烟量L＝12800*6＝76800 m3 补风量L＝38400 m3
相关计算同通风系统计算，选择两台排烟量41472 m3/h，风压273 Pa排烟风机。
主要技术措施
选用两台消防通风〔两用〕离心风机，平时排风，火灾排烟。
排烟管道上的排烟防火阀当管内烟气的温度到达2800C时，排烟防火阀自动关闭，并发出关闭电信号，同时与风机联锁。
按防烟分区划分通风排烟系统。当某一防烟分区发生火灾时，该分区正常运转，而其它防烟分区的排烟防火阀自动关闭。防排烟系统由消防控制中心集中控制。
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural