【空調風、水系統(tǒng)設計案例綜述2700字】

空調風、水系統(tǒng)設計案例綜述1風管系統(tǒng)水力計算本次我采用假定流速法來計算整個商場的風管系統(tǒng)：首先確定風量與風速，用此為依據(jù)，計算出管路的阻力與尺寸，并計算各環(huán)路的不平衡率，做出調整。以一層左側風管水力計算為例，其風管布置見5-1圖所示：圖5-1一層左側風管系統(tǒng)圖本設計中采用的是假定流速法，選擇鍍鋅薄鋼板作為風管材料，風管斷面為矩形。表5-1風管內的空氣流速風管分類住宅公共建筑干管3.4~4.56.05.0~6.58.0支管3.05.03.0~4.56.5從支管上接出的風管2.54.03.0~3.56.0表5-2有消聲要求風道內的空氣流速室內允許噪聲級dB（A）主管風速支管風速25~353~4≤235~504~72~350~656~93~5表5-3建筑物內允許的噪聲級房間名稱室內允許噪聲級dB（A聲級）高要求標準低限標準多人辦公室≤40≤45普通會議室≤40≤45餐廳≤45≤55走廊≤50≤60員工休息室≤40≤45商場≤50≤55計算機房≤45閱覽室≤40（1）最不利環(huán)路阻力計算根據(jù)標準層空調新風系統(tǒng)管道布置示意圖，首先進行管段編號，最左端為新風機組，不利環(huán)路假設由1-2-3-4-8構成，采用假定流速法計算，公式為Rm=λ已知各管段對應的風量，根據(jù)表5-1、5-2和表5-3來假定各管段的流速，再根據(jù)各管段的流速和風量，利用矩形風管參數(shù)表來查得風管的使用規(guī)格和它相對應的摩擦阻力，根據(jù)式ν=L3600a+b一層左側水力計算見表5-4、5-5：表5-4一層左側水力計算表編號G(m^3/h)L(m)D/W(mm)H(mm)υ(m/s)ΔPy(Pa)ΔPj(Pa)ΔP(Pa)12325.20.635003505.050.5313.8614.422073.611.314002205.6313.422.6616.0931382.47.114002004.87.371.869.234691.26.66400120513.43215.435345.64.24160200511.551.0112.566172.80.721602003.331.118.0219.117172.80.451602003.330.6923.8624.558345.63.481602003.23.374.758.139172.80.11602003.330.1518.4918.6410172.80.51602003.330.7621.4622.2211345.63.771602003.23.653.126.7712172.80.11602003.330.1518.4918.6413172.80.361602003.330.5621.4622.0114345.63.451602003.23.343.126.4615172.80.11602003.330.1518.4918.6416172.80.361602003.330.5621.4622.0117345.63.831602003.23.7219.3823.1續(xù)表18172.80.11602003.330.1518.4918.6419172.80.361602003.330.5621.4622.0120345.63.451602003.23.3419.3822.7221172.80.111602003.330.1718.4918.6622172.80.361602003.330.5621.4622.0123201.65.221602503.8910.5719.1329.7124201.60.711602503.891.4524.726.1525503.41602500.960.560.531.0926250.841602500.480.040.410.4627250.211602000.480.010.560.57表5-5最不利環(huán)路水力計算表最不利阻力(Pa)92編號G(m^3/h)L(m)D/W(mm)H(mm)υ(m/s)ΔPy(Pa)ΔPj(Pa)ΔP(Pa)12325.20.635003505.050.5313.8614.422073.611.314002205.6313.422.6616.0931382.47.114002004.87.371.869.234691.26.66400120513.43215.435345.64.24160200511.551.0112.567172.80.451602003.330.6923.8624.55經(jīng)計算，最不利環(huán)路總阻力為92Pa，由1-2-3-4-5-7構成。（2）各分支環(huán)路的阻力平衡計算考慮到每個環(huán)路末端都有風機盤管阻力損失為10-30kpa,計算得出新風管道系統(tǒng)各分支環(huán)路與最不利環(huán)路的不平衡率計算結果見表5-6：表5-6其他環(huán)路阻力損失及不平衡率管段編號環(huán)路構成總阻力不平衡率11-23-2489.472.8%21-2-17-18102.231.11%31-2-17-19105.67.0%41-2-3-11-1295.133.4%51-2-3-11-1398.57.06%61-2-3-4-5-687.594.8%71-2-3-4-5-793.031.11%81-25-2784.48.3%91-25-2679.413.7%101-2-20-2183.210.96%111-2-20-2279.151.4%121-3-14-1584.937.6%131-3-14-1688.34%141-4-8-983.739%151-4-8-1087.315.1%由計算結果可見，各環(huán)路與最不利環(huán)路之間的壓力損失差不超過15%，滿足一般平衡條件。2空調水系統(tǒng)設計計算本設計采用雙管制同程式系統(tǒng)。采用假定流量法，空調冷水供回水溫度為7/12℃。水系統(tǒng)的水力計算使用控制比摩阻的方法，根據(jù)每個管段的負荷確定每一管段的流量，按照各管段的流量和比摩阻，確定每一管段的管徑。四層水管布置見圖5-2：圖5-2一層水系統(tǒng)圖其具體步驟如下：(1)繪制一層的水管平面布置圖，給各管段編號；(2)選定整個系統(tǒng)中最不利的環(huán)路；(3)確定合理的水流速度；(4)根據(jù)負荷確定各管段的流量；其中流量的計算公式如下： G=0.86×Q（tG—水流量，kg/hQ—計算管段的空調冷負荷,W△t—冷水供回水溫差，△t=5℃。(5)根據(jù)流量和比摩阻，確定各計算管段的管徑。空調供回水管道比摩阻的范圍為100~300Pa/m，在該范圍內選取合適的比摩阻。(6)根據(jù)管段長度和比摩阻確定各管段的沿程阻力損失；其中摩擦阻力損失的計算公式為：?Pm比摩阻：Rm=(7)確定各管件和閥門的局部阻力系數(shù)，計算出局部阻力；?以VG1管段為例，VG1對應的管長為L=3m,冷負荷為Q=448.23kw。根據(jù)公式G=0.86×Q（t查規(guī)范得該管段最佳管徑D=125mm,流速υ=0.96m/s,比摩阻為223Pa/m,因此這一管段的沿程阻力損失ΔPVG1管段計算得到的的局部阻力系數(shù)Σξ=1.5，它的局部阻力損失?Pj因此VG1管段的總阻力損失?P=其他管段跟VG1管段相同，計算結果見表5-6：表5-6四層的水管水力計算表最不利阻力(Pa)88322最不利環(huán)路立管1樓層1編號Q(W)G(kg/h)L(m)D(mm)υ(m/s)R(Pa/m)ΣξΔPy(Pa)ΔPj(Pa)ΔP(Pa)不平衡率VG144823077095.5631251.59223.011.5669189625650.00%VH144823077095.5631251.59223.011.5669189425630.00%E171300022366.91320.65214.229148049293507730.00%FG420460035191.22.71001.13151.870.1410644740.00%FG321760037427.22.71001.2171.080.1462725340.30%FG223060039663.21.141001.27191.431.5218121514320.00%FG144823077095.568.831251.59223.012.221968441963880.00%FH143900067084.32500.84208.270.1900369350.00%FH135970010268.42.7650.79131.490.1355313860.00%FH128040013828.84.44651.06232.880.110355610910.00%FH1190750156090.06800.84119.940.1735420.90%FH1010110017389.22.64800.94147.570.1390444340.00%FH911145019169.40.06801.03178.020.11053640.80%FH812180020949.64.2801.13211.30.1887649511.70%FH7142500245102.7801.32286.330.1773878600.00%FH616320028070.48.961000.998.240.1880419200.00%FH517070029360.42.861000.94107.1040%續(xù)表FH4179000307880.071000.99117.34381464147114.70%FH223060039663.239.621001.27191.433.6375854049116330.00%FH144823077095.568.661251.59223.010.721930252544560.00%VG144823077095.5631251.59223.011.5669189425630.00%VH144823077095.5631251.59223.011.5669189425630.00%E171300022366.91320.65214.229148049293507730.00%FG420460035191.22.71001.13151.870.1410644740.00%FG321760037427.22.71001.2171.080.1462725340.30%FG223060039663.21.141001.27191.431.5218121514320.00%FG144823077095.568.831251.59223.012.221968441963880.00%FH143900067084.32500.84208.270.1900369350.00%FH135970010268.42.7650.79131.490.1355313860.00%FH128040013828.84.44651.06232.880.110355610910.00%FH1190750156090.06800.84119.940.1735420.90%FH1010110017389.22.64800.94147.570.1390444340.00%最不利環(huán)路阻力(Pa)83196最有利環(huán)路阻力53501編號Q(W)G(kg/h)L(m)D(mm)υ(m/s)R(Pa/m)ΣξΔPy(Pa)ΔPj(Pa)ΔP(Pa)不平衡率FG144823077095.568.831251.59223.012.221968441963880.00%FG223060039663.21.141001.27191.431.5218121514320.00%FG321760037427.22.71001.2171.080.1462725340.30%FG420460035191.22.71001.13151.870.1410644740.00%FG519160032955.24.321001.06133.79030%FG617090029394.82.71000.94107.340.1290443340.10%FG715020025834.44.441000.8383.770.1372344074.40%FG813985024054.20.06801.3276.10.116841000.00%FG9129500222742.64801.2237.890.1629727010.10%FG1011915020493.80.06801.11202.510.11161730.00%FG1110880018713.64.2801.01169.960.1714517650.00%FG128810015153.22.7800.82113.320.1306333391.20%FG136740011592.88.96650.89165.880.1148639152515.80%FG145990010302.82.86650.79132.330.1379314100.00%F20.14650.6899.560.11423370.00%FG16207003560.40.06400.7523100%續(xù)表F40.06400.7523100%F40.06400.7523100%FG19207003560.40.06400.7523100%FG2021763037432.361.861001.2171.131.5319108214013.80%FG2120463035196.363.171001.13151.910.1481645450.50%FG2219163032960.364.281001.06133.83030%FG2318128031180.160.241001120.240.12950790.00%FG2416828028944.162.591000.93104.20.12704331315.70%FG2515793027163.960.41000.8792.240.13738750.00%FG2614493024927.963.42801.34295.880.110119011010.00%FG2713193022691.960.18801.22246.610.1457511912.80%FG2812158020911.762.7801.13210.570.1569646320.00%FG2911123019131.560.32801.03177.350.157531100.00%FG309823016895.564.18800.91139.62020%FG318788015115.360.1800.82112.780.11233450.80%FG327753013335.162.6651.02217.120.1564526160.00%FG33671801