某二氧化碳灭火系统设计说明

1、名称,符号,单位,最大防护一区,最小防护二区,防护三区,计算公式和说明一、设计用量计算,防护区长度,L,m,40,10,10,全淹没时f1%;当f1%时，防护区宽度,B,m,24.2,10,10,应进行灭火剂流失补偿。防护区高度,H,m,0.21,3,3,防护区开口总面积,A0,0,0,0,可燃物灭火设计浓度如下：防护区内非、难燃烧体总体积,Vg,m3,0,0,0,1、图书、档案、文物：10%防护区容积,Vv,m3,203.28,300,300,2、变压、配电室、发电机房：8.3%防护区净容积,V,m3,203.28,300,300,3、通讯机房、计算机房：8%防护区总面积,Av,m3,196

2、2.964,320,320,4、A类表面火：7.5%开口总面积,A0,折算面积,A,1962.964,320,320,面积系数,K1,kg/,0.2,0.2,0.2,体积系数,K2,kg/m3,0.7,0.7,0.7,物质系数,Kb,1.5,2,2.25,防护区灭火（或惰化）设计用量,W1,kg,802.333,548.000,616.500,海拔高度m与K值：1000时K1.130二、贮存钢瓶个数估算,单个钢瓶容积,Vb,L,70,70,70,Vb钢瓶容积有40、70、90三种。钢瓶中灭火剂充装比,kg/L,0.6,0.6,0.6,灭火剂充装比1.11kg/L。钢瓶个数,n1,套,20,14

3、,15,1、最大保护高度5m；最小保护高度0.3m。四、设定喷头数量和布置,2、当保护高度1.5m时，保护直径10m,保护面积单个喷头保护面积,S,m2,24,49；两喷嘴距离为14m。均衡系统喷头数量,n2,个,41,3、当保护高度1.5m时，保护直径7m,保护面积,24；两喷嘴距离为9.5m。五、设定灭火剂喷射时间,t,min,1,t喷射时间。通讯机房、计算机房为t8s；其它防护,区，t10s。六、计算管道平均设计流量,主管平均流量,QA,kg/s,802.333,主管上主支管总数量,NB,根,2,主支管平均流量,QB,kg/s,401.167,主支管上支管总数量,NC,根,1,支管平均流

4、量,QC,kg/s,401.167,支管上分配管总数量,ND,个,1,分配管平均流量,QD,kg/s,401.167,分配管上喷嘴数量,ni,个,1,单个喷嘴平均流量,Qi,kg/s,401.167,七、初定集流管和管网中管径,集流管或主管管径,DA,mm,56.651,主支管管径,DB,mm,40.058,支管管径,DC,mm,40.058,分配管管径,DD,mm,40.058,八、选定额定公称压力,P0,Mpa,5.17,20时，系统管网压力P04.3MPa；无管网P0=2.6MPa。九、求系统内容积,集流管内容积,V2,m3,0.020164833,主管长度,LA,m,4.5,主管内容积

5、,VA,m 3,0.011342718,各主支管长度,LB,m,1.5,各主支管内总容积,VB,m3,0.003780906,各支管长度,LC,m,各支管内总容积,VC,m3,0,各分配管长度,LD,m,各分配管内总容积,VD,m3,0,系统内总管道容积,Vp,m3,4.523945739,十、喷放“过程中点”系统内压力计算,各钢瓶内喷射前气相总容积,V0,m3,802.9850746,系统内喷放中点压力,Pm,Mpa,3.799482995,十一、查表计算管路阻力损失,主管道当量长度之和,LAA,Mpa,6.7,主管道总阻力损失,PA,MPa,0.07705,主管道阻力损失系数,PA/LA

6、,Mpa/m,0.0115,主支管阻力损失系数,PB/LB,Mpa/m,0.0115,主支管当量长度之和,LBB,m ,4.7,主支管总阻力损失,PB,Mpa,0.05405,支管阻力损失系数,PC/LC,Mpa/m,支管当量长度之和,LCC,m,支管总阻力损失,PC ,Mpa,0,分配管阻力损失系数,PD/LD,Mpa/m,分配管当量长度之和,LDD,m,分配管阻力损失,PD ,Mpa,0,集流管选择阀阻力损失系数,PE/LE,Mpa/m,0.0115,集流管选择阀当量长度之和,LE,m,4,集流管选择阀阻力损失,PE,Mpa,0.046,系统内总管路阻力损失之和,P,Mpa,0.1771,

7、系统内管道当量长度之和,LAE,m,15.4,十二、管路高程压力损失计算,喷嘴与集流管高度之差,h,m,-4,系统高程压力损失,Ph,Mpa,-0.0272,当喷嘴高于集流管高度时，Ph为负值，反之为正值十三、（查表法）喷嘴处工作压力值,Pc1,Mpa,3.595182995,Pc应同时符合以下规定：1、一般，0.8MPa,最小0.5MPa,2、PcPm/2(Mpa,绝压）。十四、理论计算管路损失,管道阻力损失系数中值,K4,Mpa/m,0.0115,管道阻力损失系数小值,K3,Mpa/m,0.003,管道阻力损失系数大值,K5,Mpa/m,0.02,管道损失中值,P4,Mpa ,0.1771

8、,管道损失最小值,P3,Mpa,0.0462,管道损失最大值,P5,Mpa,0.308,十五、(计算法)喷嘴处压力中值,PC4,Mpa,3.595182995,喷嘴处压力最小值,PC3,Mpa,3.726082995,喷嘴处压力最大值,PC5,MPa,3.464282995,十六、喷嘴孔口面积计算,喷头最小孔口面积（查图法）,FC1,cm2,44.31591404,喷头最大孔口面积（查图法）,FC2,cm2,53.17909685,喷头中值孔口面积（计算法）,FC4,cm2,qc值查图5.2.102得，Pc4.2或2.5MPa曲线qc喷头小值孔口面积（计算法）,FC3,cm2,喷头大值孔口面积（计算法）,FC5,cm2,十七、选定喷嘴型号,十八、从喷嘴处倒推计算各管道管径,单个喷头孔口面积,FC,cm2,53.17909685,分配管管径,DD,mm,9.736190169,支管管径,DC,mm,40.05828753,主