自動(dòng)噴淋系統(tǒng)計(jì)算

1、自動(dòng)噴淋系統(tǒng)計(jì)算1、設(shè)計(jì)數(shù)據(jù)設(shè)計(jì)噴水強(qiáng)度qp=6L/minm2,計(jì)算作用面積160m2,最不利點(diǎn)噴頭出口壓力p=50kpa.。室內(nèi)最高溫度40C,采用68c溫級(jí)玻璃球吊頂型(或邊墻型)d=15閉式噴頭。一個(gè)噴頭的最大保護(hù)面積為12.5m2。布置在電梯前的走廊上。在走廊上單排設(shè)置噴頭，其實(shí)際的作用面積為22.5m2公稱(chēng)直徑(mm)控制的標(biāo)準(zhǔn)噴頭數(shù)(只)輕危險(xiǎn)級(jí)中危險(xiǎn)級(jí)25113233405450108651812804832100一64輕危險(xiǎn)級(jí)、中級(jí)場(chǎng)所中配水支管配水管到控制在標(biāo)準(zhǔn)噴頭數(shù)表2-42、流量計(jì)算(1)理論設(shè)計(jì)流量:2八6L/min*m160,Q16L/s60(2)一個(gè)放火分區(qū)的實(shí)際作

2、用面積的計(jì)流量:一2一一6L/min*m22.5,=2.25L/s603、噴頭布置的間距計(jì)算：(1)一個(gè)噴頭最大保護(hù)半徑，A=12.5m2R=2.5=1.9m,3.14(2)走廊最寬為1.5m,所以b=0.75m噴頭的最大間距為：S=2R2-b2=21.92-0.752=3.4m(3)噴頭的個(gè)數(shù)：L16.2n=5個(gè)S3.44、水力計(jì)算最不利層自噴各支管段的計(jì)算根據(jù)圖2-2d1-一e最不利層噴頭計(jì)算圖圖22(1)各支管段的流量計(jì)算：a處的噴頭出水量qa=kJHa=0.133J50=0.94L/S;a-b管采用DN=25mm,A=0.436722ha-b=10ALqa)=100.43673.40.

3、94=13.1KpaHb=Ha+ha-b=50+13.1=63.1Kpab處的噴頭出水量qb=k3Hb=0.133y'637=1.06L/S;qb-c=qa+qb=0.94+1.06=2.00L/Sb-c管采用DN=32mm,A=0.093862_一_2hb-c=10ALqbq=100.093863.42.00=12.76KpaHc=Hb+Hb-c=63.1+12.76=75.86Kpac處的噴頭出水量qc=k.Hc=0.133.75.86=1.16L/S;其它噴頭都以上面一樣算，為了計(jì)算簡(jiǎn)便以表格的形式。計(jì)算結(jié)果在下表2-518層自噴系統(tǒng)最不利點(diǎn)管段水力計(jì)算表表2-5節(jié)點(diǎn)編號(hào)管段編號(hào)

4、口貝頭流里系數(shù)K噴頭處水壓(Kpa)噴頭出水流量(L/s)管段流量(L/s)流量系數(shù)Kc流速v(m/s)管徑(mm)管道比阻A管長(zhǎng)(m)管道沿程水頭損失hf(Kpa)a0.13350.000.94ab0.941.8831.770250.436703.4013.10b0.13363.101.06bc2.001.0502.096320.093863.4012.76c0.13375.861.16cd3.151.0503.313320.093863.4033.40d0.133109.261.39de4.550.8003.636400.044533.4031.34e0.133140.601.58e16.

5、130.4702.881500.011080.903.751144.35E94.350(2)首層自噴系統(tǒng)支管水力計(jì)算計(jì)算根據(jù)圖2-2,結(jié)果在表2-6abj：r.c4-6e_Ld丁.7一593、一"2、女、bJ-Q、-L1-3-2首層噴頭計(jì)算圖圖2-2首層自噴系統(tǒng)支管水力計(jì)算表表2-6節(jié)點(diǎn)編號(hào)管段編號(hào)口貝頭流里系數(shù)K噴頭處水壓(Kpa)噴頭出水流量(L/s)管段流量(L/s)流量系數(shù)Kc流速v(m/s)管徑(mm)管道比阻A管長(zhǎng)(m)管道沿程水頭損失hf(Kpa)a0.13350.000.94ab0.941.8831.770250.436703.4013.10b0.13363.101.

6、06bc2.001.0502.096320.093863.4012.76c0.13375.861.16cd3.151.0503.313320.093863.4033.40d0.133109.261.39de4.550.8003.636400.044533.6033.19e0.133142.451.59e66.140.4702.886500.011080.502.106144.55E94.55010.13350.000.94120.941.8831.770250.436703.0011.5820.13361.581.04231.981.0502.083320.093863.0011.0430.1

7、3372.621.13343.111.0503.266320.093860.302.7040.13375.32453.110.8002.488320.044533.4030.8650.133106.18566.800.4703.196500.011082.1010.766116.94E66.940由上面結(jié)果得知首層最不利點(diǎn)在a處;144.55q56=6.8、116.947.56L/Sq總=6.14+7.56=13.7L/s壓力為：144.55Kpa(3)立管計(jì)算:立管為了配水的均勻,一律采用管徑DN=125mm,A=0.00008623;計(jì)算圖為2-363.3061.30.-水泵一二25823

8、222134567891Ck,1112.1315161718M1.我山2619圖2-322Dh1-2=10ALqe4=100.000086233.06.13=0.097Kpaq2=q1<=6.13H2=H1+h1-2+hz=144.35+0.097+30=174.397Kpa174.397=6.74L/s144.32)q2-3=q1+q2=6.13+6.74=12.87K/s2_2h2-3=10ALq2g=100.000086233.012.87=0.43KpaH3=H2+h2-3+hz=397+0.43+30=204.83KpaDQ3=q2204.83=7.3L/s174.397Q3-

9、4=q1+q2+q3=6.13+6.74+7.3=20.17L/s小q3420.17=-L-=1.26Q16在設(shè)計(jì)范圍(1.151.30)之間，所以系統(tǒng)的設(shè)計(jì)流量為：Qs=20.17L/s計(jì)算達(dá)到了設(shè)計(jì)的系統(tǒng)流量就以設(shè)計(jì)流量來(lái)推算下層的壓力。計(jì)算各層壓力Hi=Hi30Kpa計(jì)算結(jié)果在表反映表2-7自動(dòng)噴水滅火系統(tǒng)立管計(jì)算表2-7節(jié)點(diǎn)編號(hào)管段編號(hào)管比阻A性(m)管徑(mm)高差(m)管段流量(L/s)管道沿程水頭損失hf(Kpa)節(jié)點(diǎn)壓力(Kpa)1144.301-20.000086233.00125.003.006.130.102174.40230.000086233.00125.003.00

10、12.870.433204.83340.000086233.00125.003.0020.171.054235.88450.000086233.00125.003.0020.171.055266.93560.000086233.00125.003.0020.171.056297.98670.000086233.00125.003.0020.171.057329.04780.000086233.00125.003.0020.171.058360.09890.000086233.00125.003.0020.171.059391.149100.000086233.00125.003.0020.17

11、1.0510422.1910110.000086233.00125.003.0020.171.0511453.2511120.000086233.00125.003.0020.171.0512484.3012130.000086233.00125.003.0020.171.0513515.3513140.000086233.00125.003.0020.171.0514546.4014150.000086233.00125.003.0020.171.0515577.4515160.000086233.00125.003.0020.171.0516608.5116170.000086233.00

12、125.003.0020.171.0517639.5617180.000086233.00125.003.0020.171.0518670.6118190.000086235.00125.005.0020.171.7519672.3756.0020.1718.07(3)總橫管的計(jì)算計(jì)算過(guò)程和立管的計(jì)算一樣計(jì)算圖2-3。管徑都和立管一樣采用DN=125mm。結(jié)果在表2-8總橫管水力計(jì)算表表2-8節(jié)點(diǎn)編號(hào)管段編號(hào)管比阻A性(m)管徑(mm)高差(m)管段流量(L/s)管道沿程水頭損失hf(Kpa)節(jié)點(diǎn)壓力(Kpa)19672.3719200.0000862326.50125.0020.179.30

13、20681.6720210.0000862320.50125.0020.177.1921688.8621220.0000862326.50125.0020.179.3022698.1522230.0000862326.70125.0020.179.3723707.5223240.0000862326.50125.0020.179.3024716.8224250.0000862314.50125.0020.175.0925721.9025260.000086238.60125.008.6020.173.0226733.52£149.8020.1752.555、流速的校核：橫支管的校核在

14、表格立管核總橫管都采用DN=125mm的管，而且流量Q=20.17L/S,Kc=0.075v=Kc*q=0.07520.17=1.51m/s經(jīng)過(guò)計(jì)算校核全部管段的流速都少于5m/s,符合設(shè)計(jì)要求，不需要就行管段的調(diào)整。1、自動(dòng)滅火系統(tǒng)的減壓計(jì)算：經(jīng)過(guò)上面的水力計(jì)算，算出各層消火栓的實(shí)際壓力。六樓以下的節(jié)點(diǎn)實(shí)際壓力超過(guò)了0.5Mpa的要求，必須要采取減壓措施。每一條立管上節(jié)點(diǎn)的布置相同，數(shù)量相同；所以計(jì)算最不利立管來(lái)代表其它立管。減壓方式是采用減壓閥。由于計(jì)算資料的不全，沒(méi)有減壓閥的型號(hào)和技術(shù)參數(shù)表，計(jì)算過(guò)程只計(jì)算到減壓閥所需要的參數(shù)。減壓閥的選擇要根據(jù)廠家提節(jié)點(diǎn)編號(hào)節(jié)點(diǎn)所在層節(jié)點(diǎn)壓力(Kpa)

15、本層實(shí)際所壓力(Kpa)富余壓力(Kpa)備注136515.35144.3371.05根據(jù)廠家提供實(shí)際型號(hào)參數(shù)來(lái)選擇具體要減壓多少，但是不能減到比0.25Mpa少。145546.40144.3402.10154577.45144.3433.15163608.51144.3464.21172639.56144.3495.26181670.61144.55526.06表2-9供的實(shí)際技術(shù)參數(shù)。減壓閥的計(jì)算參數(shù)在表2-9減壓計(jì)算表7、接合器的選擇水泵接合器一般流量為1015L/S,消火栓系統(tǒng)的設(shè)計(jì)秒流量為20.17L/S所以選用2個(gè)SSQB100型的水泵接合器，兩個(gè)DN100的水泵接合器共用一條DN

16、=125mm的管接到負(fù)一層的橫管(指高位水箱連接到報(bào)警閥前的管)8、自噴系統(tǒng)水泵的選擇與計(jì)算：管路總水頭損失為：Hw=(94.35+18.07+52.55)X1.2=197.96Kpa=19.8mH2O最不利噴頭處的水壓為：Hxh=5mH2O最不利噴頭到消防水池最低水位之差為：Hi=56-(-3.5)=59.5mH2O，水泵揚(yáng)程Hp=19.8+5+59.5=84.3mH20水泵出水流量：Qx=20.17L/s由計(jì)算水泵揚(yáng)程和流量選用消防專(zhuān)用自動(dòng)恒壓泵組HXF1/202型。(q=20L/s,H=100m)9、消防水池容積計(jì)算：消防水池調(diào)節(jié)容積由消火栓系統(tǒng)設(shè)計(jì)秒流量和自噴系統(tǒng)設(shè)計(jì)秒流量確定。消火栓

17、系統(tǒng)部分容積：滿(mǎn)足2小時(shí)的滅火時(shí)間，設(shè)計(jì)秒流量為20L/S23600203=144m20L/S1000自噴系統(tǒng)部分容積：滿(mǎn)足1小時(shí)的滅火時(shí)間，設(shè)計(jì)秒流量為、，1360020.00”3V2二=72m1.01.2m/s。1000V=Vi+V2=144+72.00=216m3因?yàn)樵O(shè)有吸水井，設(shè)0.5m的保護(hù)高度；所以水池的實(shí)際尺寸為8mX8mX3.5m(長(zhǎng)x寬x高)。10、消防泵組吸水總管的確定：為了供水的安全，設(shè)置兩條吸水總管；每一條吸水總管要求承擔(dān)泵組的總流量?？偭髁坑上鹚ū媒M和自動(dòng)噴淋泵組組成。吸水管內(nèi)的流速宜采用4*總=4消+q自=20.72+20.17=40.89L/s查鋼管水力計(jì)算取，

18、DN=250mmv=0.84m/s11、消防水池進(jìn)水管的確定：消防水池的總有效調(diào)節(jié)容積為216m3,充滿(mǎn)水池需要的時(shí)間取12小時(shí)。qV=空=18mhT12查鋼管水力計(jì)算取，DN=100mm12、消防高位水箱容積計(jì)算：v=0.65m/s消火栓系統(tǒng)部分容積:滿(mǎn)足10min的滅火時(shí)間，設(shè)計(jì)秒流量為20L/sV1106020-12m31000自噴系統(tǒng)部分容積:滿(mǎn)足10min的滅火時(shí)間，設(shè)計(jì)秒流量為20L/sV21060201000=12m3V=V1+V2=12+12=24m3高位水箱的實(shí)際尺寸為4mx3mx2m（長(zhǎng)X寬X高）13、不利噴頭的校核：高位水箱的水要經(jīng)過(guò)報(bào)警閥才進(jìn)入自噴系統(tǒng)，是為了使報(bào)警閥起作用。報(bào)警閥到高位水箱管段也才用DN=125mm的管，管長(zhǎng)130m,q0=1L/s。最不利噴頭到報(bào)警閥前的總水頭損失為：Hwi=19.8mH2O報(bào)警閥到高位水箱管段的總水頭損失：22Hw2=10ALq0=100.000086231301=0.11Kpa=0.011mH2O最不利噴頭與高位水箱的高差為：HZ=61.3-56=5.3m最不利噴頭處的壓力位：Hc=5mH2O需增壓的壓力：H=Hw1+HW2+Hc-Hz=19.8+0.011+5-5.3=19.51mH2O，水泵揚(yáng)程Hp=19