【空调风、水系统设计案例综述2700字】

空调风、水系统设计案例综述1风管系统水力计算本次我采用假定流速法来计算整个商场的风管系统：首先确定风量与风速，用此为依据，计算出管路的阻力与尺寸，并计算各环路的不平衡率，做出调整。以一层左侧风管水力计算为例，其风管布置见5-1图所示：图5-1一层左侧风管系统图本设计中采用的是假定流速法，选择镀锌薄钢板作为风管材料，风管断面为矩形。表5-1风管内的空气流速风管分类住宅公共建筑干管3.4~4.56.05.0~6.58.0支管3.05.03.0~4.56.5从支管上接出的风管2.54.03.0~3.56.0表5-2有消声要求风道内的空气流速室内允许噪声级dB（A）主管风速支管风速25~353~4≤235~504~72~350~656~93~5表5-3建筑物内允许的噪声级房间名称室内允许噪声级dB（A声级）高要求标准低限标准多人办公室≤40≤45普通会议室≤40≤45餐厅≤45≤55走廊≤50≤60员工休息室≤40≤45商场≤50≤55计算机房≤45阅览室≤40（1）最不利环路阻力计算根据标准层空调新风系统管道布置示意图，首先进行管段编号，最左端为新风机组，不利环路假设由1-2-3-4-8构成，采用假定流速法计算，公式为Rm=λ已知各管段对应的风量，根据表5-1、5-2和表5-3来假定各管段的流速，再根据各管段的流速和风量，利用矩形风管参数表来查得风管的使用规格和它相对应的摩擦阻力，根据式ν=L3600a+b一层左侧水力计算见表5-4、5-5：表5-4一层左侧水力计算表编号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续表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最不利环路水力计算表最不利阻力(Pa)92编号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经计算，最不利环路总阻力为92Pa，由1-2-3-4-5-7构成。（2）各分支环路的阻力平衡计算考虑到每个环路末端都有风机盘管阻力损失为10-30kpa,计算得出新风管道系统各分支环路与最不利环路的不平衡率计算结果见表5-6：表5-6其他环路阻力损失及不平衡率管段编号环路构成总阻力不平衡率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%由计算结果可见，各环路与最不利环路之间的压力损失差不超过15%，满足一般平衡条件。2空调水系统设计计算本设计采用双管制同程式系统。采用假定流量法，空调冷水供回水温度为7/12℃。水系统的水力计算使用控制比摩阻的方法，根据每个管段的负荷确定每一管段的流量，按照各管段的流量和比摩阻，确定每一管段的管径。四层水管布置见图5-2：图5-2一层水系统图其具体步骤如下：(1)绘制一层的水管平面布置图，给各管段编号；(2)选定整个系统中最不利的环路；(3)确定合理的水流速度；(4)根据负荷确定各管段的流量；其中流量的计算公式如下： G=0.86×Q（tG—水流量，kg/hQ—计算管段的空调冷负荷,W△t—冷水供回水温差，△t=5℃。(5)根据流量和比摩阻，确定各计算管段的管径。空调供回水管道比摩阻的范围为100~300Pa/m，在该范围内选取合适的比摩阻。(6)根据管段长度和比摩阻确定各管段的沿程阻力损失；其中摩擦阻力损失的计算公式为：∆Pm比摩阻：Rm=(7)确定各管件和阀门的局部阻力系数，计算出局部阻力；∆以VG1管段为例，VG1对应的管长为L=3m,冷负荷为Q=448.23kw。根据公式G=0.86×Q（t查规范得该管段最佳管径D=125mm,流速υ=0.96m/s,比摩阻为223Pa/m,因此这一管段的沿程阻力损失ΔPVG1管段计算得到的的局部阻力系数Σξ=1.5，它的局部阻力损失∆Pj因此VG1管段的总阻力损失∆P=其他管段跟VG1管段相同，计算结果见表5-6：表5-6四层的水管水力计算表最不利阻力(Pa)88322最不利环路立管1楼层1编号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%续表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%最不利环路阻力(Pa)83196最有利环路阻力53501编号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%续表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