保温层厚度的计算方法.xls

保温层厚度的计算方法.xls

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管管道道保保温温层层厚厚度度的的计计算算方方法法（三三种种方方法法）

（一）.通过控制保温层外表面温度的方法计算管道内介质的温度t=95输入主保温层外表面温度tw1=34.66保温层平均温度tp=64.83保温材料在tp温度下的导热系数W/m1=0.048输入管道外径mdw=0.219输入管道周围空气温度tk=28输入管道外的风速m/s=4输入保温层表面到周围空气的放热系数W/（m2k）h=25.53设管道主保温层外径为d1:

d1/dwln（d1/dw）=0.1556令d1/dwln（d1/dw）=xlnx查表得：

xlnx=0.1556输入x=1.147输入则保温层厚度为:

m=0.0161

（二）.通过控制最大热损失的方法计算管道内介质的温度t=95输入保温层平均温度tp=70输入保温材料的导热系数W/m1=0.048输入管道外径mdw=0.219输入管道周围空气温度tk=28输入保温层表面到周围空气的放热系数W/（m2k）h=0.034单位表面允许最大散热量qq=93设管道主保温层外径为d1:

d1=0.3527则保温层厚度为:

m=0.0668注:

当预先定出管道或设备的表面最大允许散热损失时,其保温层的经济厚度为:

1=0.0037（三）.通过控制温度降时的保温层厚度计算管道内的介质流量kg/hG=35输入介质平均比热kj/（kg）C=896输入介质始端温度t1=95输入介质终端温度t2=70输入管道输送长度mL=1000输入平面保温层到周围空气的放热系数W/（m2k）h1=0.344输入管道支吊架局部保温系数K1=1.2输入当（t1-tk）/（t2-tk）2时TRUE设管道主保温层外径为d1:

d1=0.2290则保温层厚度为:

m=0.0050当（t1-tk）/（t2-tk）2时FALSE设管道主保温层外径为d1:

d1=0.2227则保温层厚度为:

m=0.0018（四）.直埋管道的保温层厚度计算土壤的导热系数W/mt=1.74土壤层温度tt=5埋管深度mh=1.2设管道主保温层外径为d1:

d1=0.0442则保温层厚度为:

m=-0.0874备注tw1=33.4+0.028（t50）（或者根据工艺要求直接输入）tp=（t+tw1）/2h=11.63+6.950.5d1/dwln（d1/dw）=21（t-tw1）/hdw（tw1-tk）见后面附表1见后面附表1=（d1-dw）/2=（x-1）dw/2此计算方法计算保温层厚度时,外表面温度未知,平均温度查附表2查附表3查附表4ln（d1/dw）=23.141（t-tk）/qh1=2.69dw1.211.35tw11.73/q1.5室内取0.086,室外取0.344吊架室内1.10,室外1.15;支架室内1.15,室外1.20当（t1-tk）/（t2-tk）2时,用下面公式计算：

ln（d1/dw）=23.141（tp-tk）LK1/GC（t1-t2）h1=（d1-dw）/2当（t1-tk）/（t2-tk）2时，用下面公式计算：

ln（d1/dw）=23.141（t2-tk）LK1/GC（t1-tk）h1=（d1-dw）/2一般可取1.74W/m管管道道保保温温层层厚厚度度的的计计算算方方法法（三三种种方方法法）一般可取5lnd1=1（tw1-tt）ln（dw）+1（t-tw1）ln（4h）/t（tw1-tt）+1（t-tw1）=（d1-dw）/2x与与xlnx函函数数表表（当当x=15时时的的xlnx）值值xxlnxxxlnxxxlnxxxlnxx10.0001.420.4992.141.632.863.0023.581.0050.0051.430.5122.151.6482.873.0213.591.010.010051.440.5262.161.6652.883.0453.61.0150.015151.450.5392.171.6812.893.0653.611.020.02021.460.5522.181.6992.93.0853.621.0250.2531.470.5652.191.722.913.1043.631.030.03041.480.582.21.7352.923.133.641.0350.03561.490.5942.211.7562.933.153.651.040.04071.50.6072.221.7712.943.173.661.0450.0461.510.6222.231.7912.953.193.671.050.05121.520.6372.241.8052.963.213.681.0550.05651.530.652.251.8252.973.243.691.060.06171.540.6652.261.8412.983.253.71.0650.0671.550.6792.271.8612.993.273.711.070.07241.560.6952.281.8833.293.721.0750.07771.570.7082.291.8993.013.313.731.080.08311.580.7222.31.923.023.343.741.0850.08851.590.7372.311.9353.033.363.751.090.09461.60.7512.321.9553.043.383.761.0950.09941.610.7652.331.973.053.43.771.10.10481.620.7822.341.993.063.423.781.1050.111.630.7992.352.0073.073.443.791.110.11621.640.8152.362.0273.083.463.81.1150.121.1.650.8272.372.0423.093.483.811.120.127.1.660.8422.382.0623.13.53.821.1250.13271.670.8562.392.083.113.533.831.130.1381.680.8722.42.13.123.553.841.1350.1431.690.8892.412.123.133.573.851.140.14921.70.9022.422.143.143.593.861.1450.15451.710.9162.432.163.153.613.871.150.16071.720.9322.442.183.163.643.881.1550.16651.730.9492.452.1953.173.663.891.160.17211.740.9652.462.2173.183.683.91.1650.17721.750.982.472.2333.193.73.911.170.18461.760.9942.482.2553.23.723.921.1750.1891.771.0112.492.273.213.743.931.180.1951.781.0292.52.293.223.763.941.1850.2011.791.042.512.313.233.783.951.190.2071.81.0592.522.3283.243.813.961.1950.2131.811.0812.532.3443.253.833.971.20.2181.821.0892.542.373.263.853.981.2050.251.831.1082.552.3853.273.883.991.210.231.841.1212.562.4053.283.941.2150.2361.851.1382.572.4253.293.924.011.220.2421.861.1522.582.4443.33.944.021.2250.2451.871.1692.592.4623.313.964.031.230.25451.881.1852.62.483.323.984.041.2350.2611.891.2052.612.5033.3344.051.240.2661.91.222.622.5213.344.034.061.2450.2721.911.2342.632.543.354.054.071.250.2791.921.2512.642.563.364.074.081.2550.2851.931.272.652.583.374.094.091.260.2911.941.2882.662.63.384.124.11.2650.2981.951.3022.672.623.394.144.111.270.341.961.3182.682.643.44.164.121.2750.3091.971.3352.692.663.414.184.131.280.3161.981.3512.72.683.424.24.141.2850.3221.991.3692.712.73.434.234.151.290.32821.3862.722.723.444.254.161.2950.3342.011.4012.732.743.454.274.171.30.342.021.4192.742.763.464.34.181.310.3542.031.4392.752.783.474.324.191.320.3672.041.4552.762.83.484.344.21.330.382.051.4712.772.823.494.364.211.340.3892.061.4882.782.843.54.384.221.350.4052.071.5072.792.863.514.44.231.360.4172.081.522.82.883.524.424.241.370.4322.091.5422.812.9013.534.454.251.380.4452.11.5592.822.9213.544.474.261.390.4572.111.5792.832.943.554.54.271.40.472.121.5922.842.9613.564.524.281.410.4852.131.612.852.983.574.554.29xlnxxxlnx4.574.36.274.594.316.294.624.326.324.644.336.354.664.346.384.684.356.44.714.366.424.734.376.444.754.386.464.774.396.484.84.46.524.824.416.544.844.426.574.864.436.64.884.446.624.914.456.644.934.466.674.964.476.74.984.486.7254.496.745.034.56.775.054.516.795.074.526.815.094.536.835.124.546.865.154.556.95.174.566.925.194.576.945.214.586.975.244.596.995.264.67.025.284.617.055.314.627.075.334.637.15.354.647.1253.74.657.145.44.667.165.434.677.195.454.687.215.474.697.245.54.77.265.534.717.285.554.727.325.574.737.355.64.747.385.624.757.45.644.767.425.664.777.455.684.787.475.714.797.55.744.87.525.764.817.555.784.827.585.814.837.65.834.847.635.854.857.655.884.867.685.914.877.75.934.887.735.954.897.765.984.97.786.01