PAGEI某三層建筑的排煙系統(tǒng)設(shè)計計算案例目錄TOC\o"1-3"\h\u2873某三層建筑的排煙系統(tǒng)設(shè)計計算案例 1264371.1排煙方式的確定 1303431.2機械排煙系統(tǒng)中排煙口的布置及尺寸確定 16103031.3機械排煙系統(tǒng)中管道的布置及尺寸確定 18224191.4防煙分區(qū)阻力計算 2049461.4.1沿程阻力計算 20320801.4.2最不利管路阻力計算 21144171.4.3排煙風(fēng)機的選取 211.1排煙方式的確定根據(jù)規(guī)范《建筑防煙排煙系統(tǒng)技術(shù)標(biāo)準GB51251-2017》，決定建筑內(nèi)是采用機械排煙還是自然排煙可以根據(jù)室內(nèi)可開啟的外窗面積，當(dāng)可開窗面積不小于房間面積的2％時，可以采用自然排煙。首先劃分防火分區(qū)，各層防煙分區(qū)的設(shè)置情況見圖3-1至3-5。圖31商場地下一層防火分區(qū)設(shè)置情況圖32商場一層防火分區(qū)設(shè)置情況圖33商場二層防火分區(qū)設(shè)置情況圖34商場三層防火分區(qū)設(shè)置情況圖35酒店標(biāo)準層防火分區(qū)設(shè)置情況根據(jù)防火分區(qū)劃分防煙分區(qū)，各防煙分區(qū)的排煙方式見下表3-1至表3-5，各層防煙分區(qū)的設(shè)置情況見圖3-6至圖3-10。表3-1負一層防煙分區(qū)層數(shù)防煙分區(qū)面積/m2通風(fēng)面積/m2排煙方式-1-1-14120機械排煙-1-1-2600無-1-1-3300自然排煙-1-1-46280機械排煙-1-1-55040機械排煙-1-1-6320自然排煙表3-2一層防煙分區(qū)層數(shù)防煙分區(qū)面積/m2通風(fēng)面積/m2排煙方式11-139731.5機械排煙11-29880機械排煙11-38410機械排煙11-410000機械排煙11-59600機械排煙11-69600機械排煙11-79864.5機械排煙11-89600機械排煙11-96580機械排煙11-106990機械排煙11-113110機械排煙11-121260機械排煙11-132465.4無11-14405.4自然排煙11-15325.4自然排煙11-16380自然排煙11-17444.5自然排煙11-18-1365.4自然排煙11-18-2760無11-19-1360無11-19-2240自然排煙11-20300無11-21480無11-22445.4自然排煙11-23325.4自然排煙表3-3二層防煙分區(qū)層數(shù)防煙分區(qū)面積/m2通風(fēng)面積/m2排煙方式22-152631.5機械排煙22-28980機械排煙22-39690機械排煙22-49360機械排煙22-57680機械排煙22-67680機械排煙22-78084.5機械排煙22-89920機械排煙22-96260機械排煙22-107400機械排煙22-113110機械排煙22-121440機械排煙22-137925.4機械排煙22-14405.4自然排煙22-15325.4自然排煙22-16380自然排煙22-17444.5自然排煙22-18-1365.4自然排煙22-18-2760無22-19-1360無22-19-2240自然排煙22-20302.7無22-21480無22-22440自然排煙22-232460無22-24320自然排煙表3-4三層防煙分區(qū)劃分層數(shù)防煙分區(qū)面積/m2通風(fēng)面積/m2排煙方式33-15460機械排煙33-27924.5機械排煙33-38400機械排煙33-44560機械排煙33-59530機械排煙33-67580機械排煙33-76530機械排煙33-87510機械排煙33-97620機械排煙33-105760機械排煙33-118160機械排煙33-125660機械排煙33-133110機械排煙33-141440機械排煙33-15320自然排煙33-16380自然排煙33-17444.5自然排煙33-18-1360自然排煙33-18-2760無33-19-1360無33-19-2240自然排煙33-20302.7無33-21480無33-22440自然排煙33-232460無33-24400自然排煙33-25320自然排煙表3-5酒店標(biāo)準層（4-15）防煙分區(qū)防煙分區(qū)面積/m2通風(fēng)面積/m2排煙方式備注標(biāo)準層-11002.16機械排煙注[1]標(biāo)準層-227829.16自然排煙標(biāo)準層-314016.2自然排煙標(biāo)準層-4606.48自然排煙標(biāo)準層-5566.48自然排煙標(biāo)準層-6302.7自然排煙注[1]：因最不利點距排煙口水平距離大于30m，排煙方式使用機械排煙。圖36商場地下一層防煙分區(qū)設(shè)置情況圖37商場一層防煙分區(qū)設(shè)置情況圖38商場二層防煙分區(qū)設(shè)置情況圖39商場三層防煙分區(qū)設(shè)置情況圖310酒店標(biāo)準層防煙分區(qū)設(shè)置情況1.2機械排煙系統(tǒng)中排煙口的布置及尺寸確定排煙系統(tǒng)中，對于排煙口尺寸的確定通常使用公式（3-1）進行計算：F(3-1)式中：v——單位時間內(nèi)單位面積的防煙分區(qū)的排煙量（v=60m3/(m2·h)）F——單個防煙分區(qū)的地面面積，m2Wy——實際煙氣排出速度，m/s，規(guī)范要求金屬風(fēng)道≤10m/s下面以一層防煙分區(qū)1-1的計算過程為例：①排煙口的尺寸確定防煙分區(qū)1-1的面積為397m2，代入公式得到F排煙口尺寸選擇型號為1000mm×250mm。=1×0.25=0.25m2依據(jù)額定尺寸計算數(shù)量：0.66因此選用此型號排煙口數(shù)量為3個。②實際風(fēng)速核算u其他各分區(qū)計算過程同理，數(shù)據(jù)見下表3-6至表3-10。表3-6負一層防煙分區(qū)（機械排煙）排煙口數(shù)量及風(fēng)速防煙分區(qū)面積/m2排煙口額定截面積/m2排煙口尺寸/mm×mm額定數(shù)量/個實際數(shù)量/個預(yù)設(shè)風(fēng)速/m·s-1-1-14120.691000×2502.7539.16-1-46281.051000×2504.1958.37-1-55040.841000×2501.3648.40表3-7一層防煙分區(qū)（機械排煙）排煙口數(shù)量及風(fēng)速防煙分區(qū)面積/m2排煙口額定截面積/m2排煙口尺寸/mm×mm額定數(shù)量/個實際數(shù)量/個預(yù)設(shè)風(fēng)速/m·s-11-13970.661000×2502.6538.821-29881.651000×2506.5979.411-38411.401000×2505.6169.341-410001.671000×2506.6779.521-59601.601000×2506.4079.141-69601.601000×2506.4079.141-79861.641000×2506.5779.391-89601.601000×2506.4079.141-96581.101000×2504.3958.771-106991.171000×2504.6659.321-113110.52800×2502.5938.641-121260.211000×2500.8418.40表3-8二層防煙分區(qū)（機械排煙）排煙口數(shù)量及風(fēng)速防煙分區(qū)面積/m2排煙口額定截面積/m2排煙口尺寸/mm×mm額定數(shù)量/個實際數(shù)量/個預(yù)設(shè)風(fēng)速/m·s-12-15260.881000×2501.5148.772-28981.501000×2505.9969.982-39691.621000×2506.4679.232-49361.561000×2506.2478.912-57681.281000×2505.1268.532-67681.281000×2505.1268.532-78081.351000×2505.3968.982-89921.651000×2506.6179.452-96261.041000×2504.1758.352-107401.231000×2504.9359.872-113110.52800×2502.5938.642-121440.241000×2500.9619.602-137921.321000×2505.2868.80表3-9四層防煙分區(qū)（機械排煙）排煙口數(shù)量及風(fēng)速防煙分區(qū)面積/m2排煙口額定截面積/m2排煙口尺寸/mm×mm額定數(shù)量/個實際數(shù)量/個預(yù)設(shè)風(fēng)速/m·s-13-15460.911000×2501.6449.103-27921.321000×2505.2868.803-38401.401000×2505.6069.333-44560.76800×2501.8049.503-59531.591000×2506.3579.083-67581.261000×2505.0568.423-76531.091000×2504.3558.713-87511.251000×2505.0168.343-97621.271000×2505.0868.473-105760.961000×2501.8449.603-118161.361000×2505.4469.073-125660.941000×2501.7749.433-133110.52800×2502.5938.643-141440.241000×2500.9619.60表3-10酒店標(biāo)準層防煙分區(qū)（機械排煙）排煙口數(shù)量及風(fēng)速防煙分區(qū)面積/m2排煙口額定截面積/m2排煙口尺寸/mm×mm額定數(shù)量/個實際數(shù)量/個預(yù)設(shè)風(fēng)速/m·s-1標(biāo)準層-11000.17400×2502.438.33注：其中規(guī)范規(guī)定，走道設(shè)計排煙量不應(yīng)小于13000m3/h。所以標(biāo)準層-1（走道）排煙量為13000m3/h。1.3機械排煙系統(tǒng)中管道的布置及尺寸確定若某一排煙管道只負責(zé)1個防煙分區(qū)，則每平方米應(yīng)至少滿足60m3/h的排煙量需求。以一層防煙分區(qū)1-1為例，排煙量為：V=60×397=23820m3/h排煙管道截面積：S額定=則管道規(guī)格可選擇1250×630。S=1.25×0.63=0.79m2管道實際風(fēng)速（金屬管道風(fēng)速≤20m/s）：v若某一排煙管道負責(zé)2個及以上防煙分區(qū)，則每平方米應(yīng)至少滿足120m3/h的排煙量需求。其他各分區(qū)數(shù)據(jù)見下表3-11至表3-15。表3-11負一層防煙分區(qū)管道尺寸及風(fēng)速防煙分區(qū)面積/m2額定截面積/m2選用面積/m2實際管道風(fēng)速/m·s-1選用的管道規(guī)格/mm×mm備注-1-14120.690.798.721250×630最大1-1-46280.700.7911.291250×630最大2-1-55040.650.7910.671250×630注：“最大-序號”表示為管道負責(zé)的面積最大的防煙分區(qū)表3-12一層防煙分區(qū)管道尺寸及風(fēng)速防煙分區(qū)面積/m2額定截面積/m2選用面積/m2實際管道風(fēng)速/m·s-1選用的管道規(guī)格/mm×mm備注1-13970.660.798.401250×630最大11-29880.821.0116.301600×6301-38410.700.7917.801250×6301-410000.831.0116.501600×630最大21-59600.801.0115.841600×6301-69600.801.0115.841600×6301-79860.821.0116.271600×630最大31-89600.801.0115.841600×630最大41-96580.550.7911.931250×6301-106990.580.7914.791250×6301-113110.520.796.581250×6301-121260.210.268.08800×320注：“最大-序號”表示為管道負責(zé)的面積最大的防煙分區(qū)表3-13二層防煙分區(qū)管道尺寸及風(fēng)速防煙分區(qū)面積/m2額定截面積/m2選用面積/m2實際管道風(fēng)速/m·s-1選用的管道規(guī)格/mm×mm備注2-15260.440.7911.101250×630最大12-28980.750.7919.011250×6302-39690.811.0115.991600×630最大22-49360.780.7919.811250×6302-57680.640.7916.251250×6302-67680.640.7916.251250×6302-78080.670.7917.101250×630最大32-89920.831.0116.371600×630最大42-96260.520.7911.251250×6302-107400.620.7915.661250×6302-113110.260.3216.201000×3202-121440.120.1615.00500×3202-137920.660.7916.761250×630注：“最大-序號”表示為管道負責(zé)的面積最大的防煙分區(qū)表3-14三層防煙分區(qū)管道尺寸及風(fēng)速防煙分區(qū)面積/m2額定截面積/m2選用面積/m2實際管道風(fēng)速/m·s-1選用的管道規(guī)格/mm×mm備注3-15460.460.7911.521250×630最大13-27920.660.7916.761250×6303-38400.701.0111.861600×630最大23-44560.380.5015.201000×5003-59530.790.8019.851600×500最大33-67580.630.7916.041250×6303-76530.540.7911.821250×6303-87510.630.7915.891250×6303-97620.640.7916.131250×6303-105760.480.5019.201250×6303-118160.680.7912.151250×630最大43-125660.470.7911.941250×6303-133110.260.3216.201000×3203-141440.120.1615.00500×320注：“最大-序號”表示為管道負責(zé)的面積最大的防煙分區(qū)表3-15酒店標(biāo)準層（4-15）防煙分區(qū)管道尺寸及風(fēng)速防煙分區(qū)面積/m2額定截面積/m2選用面積/m2實際管道風(fēng)速/m·s-1選用的管道規(guī)格/mm×mm備注標(biāo)準層-11000.080.218.06500×400最大1其中規(guī)范規(guī)定，走道設(shè)計排煙量不應(yīng)小于13000m3/h。所以標(biāo)準層-1（走道）排煙量為13000m3/h。注：“最大-序號”表示為管道負責(zé)的面積最大的防煙分區(qū)1.4防煙分區(qū)阻力計算以防煙分區(qū)1-1為例1.4.1沿程阻力計算管道規(guī)格選取1250mm×630mm，則當(dāng)量直徑為：d=管道長度31.4m，氣體密度取1.29kg/m3，風(fēng)道摩擦阻力系數(shù)取0.03，則沿程阻力：?局部阻力計算:局部阻力系數(shù)ξ：三通ξ1四通ξ290°直角ξ3漸擴管ξ4防火閥ξ5?其他各分區(qū)數(shù)據(jù)見表3-16至表3-19。1.4.2最不利管路阻力計算對排煙風(fēng)機1-FJ1計算，最不利管道的沿程阻力和局部阻力之和為65.25Pa。最大流量取QP其他各分區(qū)數(shù)據(jù)見表3-16至表3-19。1.4.3排煙風(fēng)機的選取查詢相關(guān)書籍后，風(fēng)機選取為HTF-18型。所選風(fēng)機型號對應(yīng)的參數(shù)見表3-20。最后各樓層計算最不利管路后的結(jié)果及風(fēng)機選型見表3-21。表3-16負一層防煙分區(qū)阻力計算防煙分區(qū)風(fēng)速/m·s-1管道尺寸/mm×mm當(dāng)量直徑/m管段長度/m沿程阻力/Pa90°彎頭/Pa三通/Pa四通/Pa漸擴管/Pa防火閥/Pa局部阻力/Pa總阻力/Pa-1-18.721250×6300.8431.455.152.720007.4110.1365.27-1-411.291250×6300.8451.5218.256.3111.710017.2135.23251.49-1-510.671250×6300.8452.5138.054.070.580011.0915.74151.79表3-16一層防煙分區(qū)阻力計算防煙分區(qū)風(fēng)速/m·s-1管道尺寸/mm×mm當(dāng)量直徑/m管段長度/m沿程阻力/Pa90°彎頭/Pa三通/Pa四通/Pa漸擴管/Pa防火閥/Pa局部阻力/Pa總阻力/Pa1-18.41250×6300.8431.451.172.524.68006.8814.0865.251-216.31600×6300.9087.8499.30052.874.07025.8982.82582.131-317.81250×6300.8481.7597.89042.0321.01030.8891.92691.811-416.51600×6300.9051.8311.51019.450026.5345.98359.481-515.841600×6300.9069370.56031.281.84024.4561.57432.131-615.841600×6300.9056.5301.43016.6416.64024.4557.73361.161-716.271600×6300.9056.5320.12018.910025.8044.70364.831-815.841600×6300.9065.6352.308.96016.64024.4550.05402.351-911.931250×6300.8447.4212.441.47015.84018.9138.21250.661-1014.791250×6300.8481.7422.8811.7214.5117.86021.3265.40488.281-116.581250×6300.8456.556.5002.872.870.114.2210.0766.571-128.08800×3200.461335.9204.33006.3610.6946.62表3-17二層防煙分區(qū)阻力計算防煙分區(qū)風(fēng)速/m·s-1管道尺寸/mm×mm當(dāng)量直徑/m管段長度/m沿程阻力/Pa90°彎頭/Pa三通/Pa四通/Pa漸擴管/Pa防火閥/Pa局部阻力/Pa總阻力/Pa2-111.11250×6300.8431.489.366.608.1700012.0126.78116.142-219.011250×6300.8489742.87071.915.53035.22112.65855.522-315.991600×6300.9081.7447.11031.9216.96024.9275.79522.902-419.811250×6300.8451.8487.65028.030038.2466.27551.932-516.251250×6300.8469420.84035.034.04025.7364.80485.642-616.251250×6300.8456.5344.60017.5117.51025.7360.76405.362-717.11250×6300.8458391.72020.890028.5049.38441.102-816.371600×6300.9065.6376.279.57017.77026.1151.46429.732-911.251250×6300.8447.4192.211.14014.33017.1134.58226.782-1015.661250×6300.8481.7474.1011.1416.2720.02021.9071.32547.422-1116.21000×3200.4858607.484.6917.4117.411.3425.5766.41671.892-1215500×3200.3913145.03014.920021.9336.85181.882-1316.761250×6300.8488570.945.0221.500027.3751.89624.82表3-18三層防煙分區(qū)阻力計算防煙分區(qū)風(fēng)速/m·s-1管道尺寸/mm×mm當(dāng)量直徑/m管段長度/m沿程阻力/Pa90°彎頭/Pa三通/Pa四通/Pa漸擴管/Pa防火閥/Pa局部阻力/Pa總阻力/Pa3-111.521250×6300.8437.8115.872.378.800012.9324.10139.973-216.761250×6300.8486.8561.155.022.874.30027.3739.55602.713-311.861600×6300.9090.2370.881.4338.2212.74018.7271.12441.993-415.21000×5000.6764429.184.1345.9715.32022.5187.94517.123-519.851600×5000.9057.3481.25080.410038.40118.81602.063-616.041250×6300.8454320.8901.3117.06025.0741.45364.343-711.821250×6300.8461.1269.54011.640018.6132.25301.793-815.891250×6300.8478.5457.80019.320024.6141.93501.733-916.131250×6300.8454.1325.114.651.3317.26025.3548.58371.693-1019.21250×6300.8461.5521.6419.7505.64035.9261.31584.963-1112.151250×6300.8479.9272.435.2720.349.79014.3949.78322.223-1211.941250×6300.8479.2260.795.0910.189.46011.8938.