冷却水冷冻水计算方法及设计

1、某建筑建筑面积为4000m,选用冷水机组一台,制冷量为455KW.冷凝器侧水阻力为4.9104Pa,进、出冷凝器的水温分别为32和37,水处理器的阻力为2.0104Pa,冷却水管总长48m,冷却塔盛水池到喷嘴的高差为2.5m,确定各管段的管径和水泵的选择参数.冷却水循环管路,由于管径没有沿程变化,认为是一个计算管段,则计算管段的冷却水流量为q=Q/(c*(t2-t1)=1.3*455/(4.1868*1000*(37-32)=28.25Kg/s=102.3m3/h1.3是安全系数根据冷却水流量102.3m3/h,查表流量与管径关系可以按水流速推荐值或根据流量来选择管径(其实是同样的数据：不过是

2、把推荐流速算成流量而已),选用管道公称直径DN150mm(开式系统),管道水流速为v=q/(d/2)*(d/2)=102.3/3600/(3.14*(0.15/2)*(0.15/2)=1.61m/s查表冷却水可得到管道比摩阻为187Pa/m左右则沿程阻力损失为：187*48=9103Pa弯头、止回阀、闸阀等管件等的局部阻力系数总和为12.46则总局部阻力为：12.46*(v2/2)=12.46*(994.1*1.612/2)=1.61*104Pa设备总阻力损失包括冷凝器阻力损失和水处理器阻力损失,为P=4.9*104+2.0*104=6.9*104Pa(题目中有数据)冷却塔喷雾所需压力p0=4

3、.9104Pa(可参考样本)冷却水提升高度为2.5m,所需的提升压力为ph=2.5m9807N/m3=2.45104Pa故冷却水泵的扬程为P=16.76104Pa=17.1m水柱选用水泵,流量和扬程皆考虑10%的余量;则选用水泵的参数为流量1.1102.3m3/h=112.5m3/h,扬程1.117.1m=18.81mH2O.根据冷却水流量102.3m3/h,查表流量与管径关系可以按水流速推荐值或根据流量来选择管径(其实是同样的数据：不过是把推荐流速算成流量而已),选用管道冷却水管不同流量、不同管径、不同流速的沿程比摩阻DN50DN70内径53 mm68m3/hPa/mm/sm3/hPa/mm

4、/sm3/h3.6270.20.468.0592.50.6216.093.82780.488.55104.30.6517.14.0286.20.519.05116.70.6918.14.53108.60.579.55129.80.7319.115.03133.60.6310.06143.60.7720.115.53161.20.711.06173.30.8521.126.03191.30.7612.07205.80.9222.136.542240.8213.07241123.137.04259.30.8914.08279.11.0824.147.54297.20.9515.09319.91.1

5、525.148.05337.61.0116.09363.51.2326.158.55380.61.0817.1409.91.3127.159.05426.21.1418.1459.11.3928.169.55474.41.219.11511.11.4629.1710.06525.21.2720.11565.91.5430.17DN150DN20015620789.51143.71.28135.7775.11.12241.3892.53153.51.33140.880.71.16261.4996.551671.39150.8692.51.25281.61100.57181.11.44160.92

6、105.11.33301.72105.6199.51.52170.97118.61.41321.83110.63218.81.59181.03132.81.5341.95115.662391.66191.09147.91.58362.06120.692601.73201.15163.71.66382.18125.722821.8221.26197.81.83402.29130.75304.91.88241.38235.21.99422.41135.77328.61.95261.49275.72.16442.52140.8353.32.02281.61319.62.33462.64150.864

7、05.22.17301.72366.62.49482.75160.92460.72.31321.83416.82.66502.87170.97519.82.45341.95470.32.82522.98注:表中冷却水温度为34.5(32+37)/2),密度994.3kg/m3,运动粘滞系数0.73510-6m2/s,管壁绝对粗糙度0.5mm.DN80DN100DN12580.5106131Pa/mm/sm3/hPa/mm/s1510.8835.2169.51.1156.32142.61.16170.20.9336.21179.21.1459.34158.11.22190.60.9937.211

8、89.21.1762.36174.51.29212.11.0438.22199.51.265.37191.61.35234.71.139.222101.2468.39209.51.41258.51.1540.23220.81.2771.41228.31.47283.51.2142.24243.21.3374.42247.81.53309.61.2644.25266.71.3977.44268.21.6336.81.3246.26291.31.4680.46289.31.66365.21.3748.283171.5283.48311.21.72394.81.4350.29343.71.5886.

9、493341.78425.51.4853.3385.91.6889.51357.51.85457.31.5456.32430.51.7792.53381.91.91490.31.5959.34477.51.8796.55415.61.99524.51.6562.36433.61.96100.57450.72.07DN250DN300DN400259309408731.27502.87124.71.86834.7679.91.7785.51.38522.98134.81.94864.9385.81.8499.11.49543.1145.32.01895.191.81.9113.61.59563.

10、21156.22.09925.2798.11.97129.21.7583.32167.52.16955.45104.52.03145.71.8603.44179.22.24985.62111.22.1163.21.91623.55191.22.311015.79118.12.16181.82.02643.67203.72.391045.96125.12.22201.32.12663.78216.62.461076.13132.42.29221.82.23683.9229.82.531106.31139.92.35243.32.33704.01243.52.611136.48147.62.422

11、65.82.44724.13257.52.681166.65155.52.48289.32.55744.242722.761196.82163.62.54313.82.65764.36286.82.831226.99171.92.61339.32.76784.473022.911257.17180.42.67冷却水管不同流量、不同管径、不同流速的沿程比摩阻注:表中冷却水温度为34.5(32+37)/2),密度994.3kg/m3,运动粘滞系数0.73510-6m2/s,管壁绝对粗糙度0.5mm.DN15DN20DN2715.820.3270.1354.80.190.2644.80.20.453

12、7.70.1462.70.20.2851.30.220.545.70.1571.20.210.358.20.240.5554.50.1680.10.230.3577.20.270.6640.1789.50.240.498.90.310.6574.20.1899.50.260.451230.350.785.10.19109.90.270.5149.70.390.7596.80.2120.80.290.55178.90.430.8109.10.22144.10.310.6210.60.470.85122.20.24169.30.340.65244.80.510.91360.26196.50.370

13、.7281.50.551165.70.28225.60.40.75320.70.591.2233.70.3256.70.430.8362.30.631.43130.35342.80.50.85406.50.671.6403.60.4440.90.570.9453.10.711.8505.6DN50DN70DN80536880.53.662.80.45880.90.61161293.869.50.488.590.80.6517144.9476.50.59101.20.6918161.74.595.60.579.5112.20.7319179.55116.60.6310123.70.7720.01

14、198.15.5139.80.6911148.40.8421.01217.661650.7612175.30.9222.01238.16.5192.20.8213204.4123.01259.47221.50.8814235.71.0724.01281.77.5252.80.9515269.31.1525.01304.98286.11.01163051.2226.013298.5321.51.0717342.91.327.0135493591.1318383.11.3828.01379.99.5398.51.219425.51.4529.01406.7104401.2620.014701.53

15、16434.4DN150DN200DN25015620725989.02120.31.28135.0363.31.12240.0661.192.02128.31.32140.0467.91.16260.0771.496.02139.31.38150.0477.61.24280.0782.4100.03150.81.44160.0487.91.32300.0894.3105.03165.81.51170.0498.91.4320.08106.9110.03181.51.58180.05110.41.49340.09120.3115.03197.91.65190.05122.71.57360.09

16、134.5120.032151.72200.05135.61.65380.1149.4125.03232.81.79220.06163.21.82400.1165.2130.03251.31.87240.06193.41.98420.11181.7135.03270.51.94260.07226.22.15440.11199.1140.04290.42.01280.07261.52.31460.12217.2150.04332.32.15300.08299.42.48480.12236.1160.04377.12.3320.08339.82.64500.13255.8170.04424.72.

17、44340.09382.82.81520.13276.3注:表中冷冻水温度为9.5(7+12)/2),密度999.75kg/m3,运动粘滞系数1.32910-6m2/s,管壁绝对粗糙度0.2mm.DN32DN4035.8410.221410.281.649.70.340.241.257.50.331.861.80.380.271.476.60.39275.30.420.291.698.30.442.2900.460.321.8122.60.52.41060.510.34249.50.552.6123.30.550.362.2179.10.612.8141.80.590.392.4211.20.

18、663161.60.630.412.6245.90.723.2182.60.670.442.8283.20.783.4204.90.720.493323.10.833.6228.50.760.583.2365.60.893.8253.30.80.683.4410.60.944279.40.840.783.6458.314.5350.20.950.873.8508.51.055428.81.05DN100DN1251061310.8735.011431.156.011201.150.9336.01150.91.1359.01132.71.220.9837.01159.11.1762.02146.

19、11.281.0438.01167.51.265.02160.11.341.0939.01176.21.2368.02174.71.41.1540.011851.2671.021901.461.242.01203.31.3274.02205.91.531.2644.01222.51.3977.02222.41.591.3146.01242.51.4580.02239.61.651.3748.01263.41.5183.02257.41.711.4250.01285.21.5886.02275.81.771.4753.01319.41.6789.02294.91.841.5356.01355.6

20、1.7692.02314.61.91.5859.01393.71.8696.02341.81.981.6462.02433.71.95100.03370.22.06DN300DN3503093591.27500.13102.81.85600.1567.81.651.37520.131111.93620.1672.21.71.48540.14119.52640.1676.81.761.58560.14128.32.08660.1781.61.811.69580.15137.42.15680.1786.51.871.79600.15146.82.22700.1891.51.921.9620.161

21、56.52.3720.1896.71.982.01640.16166.62.37740.191022.032.11660.17176.92.45760.19107.52.092.22680.17187.62.52780.2113.12.142.32700.18198.62.59800.2118.82.22.43720.18209.92.67830.21127.72.282.53740.19221.52.74860.22136.92.362.64760.19233.42.82890.22146.42.442.74780.2245.62.89920.23156.32.53注:表中冷冻水温度为9.5(7+12)/2),密度999.75kg/m3,运动粘滞系数1.32910-6m2/s,管壁绝对粗糙度0.2mm.管内水流速推荐值m/s管径/mm15202532405065闭式系统 0.4-