管道保温层厚度的计算方法(三种方法).xls

管道保温层厚度的计算方法(三种方法).xls

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管管道道保保溫溫層層厚厚度度的的計計算算方方法法（三三種種方方法法）

（一）.透過控制保溫層外表面溫度的方法計算管道內介質的溫度t=95輸入主保溫層外表面溫度tw1=34.66保溫層平均溫度tp=64.83保溫材料在tp溫度下的導熱系數W/m1=0.048輸入管道外徑mdw=0.219輸入管道周遭空氣溫度tk=28輸入管道外的風速m/s=4輸入保溫層表面到周遭空氣的放熱系數W/（m2k）h=25.53設管道主保溫層外徑為d1:

d1/dwln（d1/dw）=0.1556令d1/dwln（d1/dw）=xlnx查表得xlnx=0.1556輸入x=1.147輸入則保溫層厚度為:

m=0.0161

（二）.透過控制最大熱損失的方法計算管道內介質的溫度t=95輸入保溫層平均溫度tp=70輸入保溫材料的導熱系數W/m1=0.048輸入管道外徑mdw=0.219輸入管道周遭空氣溫度tk=28輸入保溫層表面到周遭空氣的放熱系數W/（m2k）h=0.034單位表面允許最大散熱量qq=93設管道主保溫層外徑為d1:

d1=0.3527則保溫層厚度為:

m=0.0668注:

當預先定出管道或設備的表面最大允許散熱損失時,其保溫層的經濟厚度為:

1=0.0037（三）.透過控制溫度降時的保溫層厚度計算管道內的介質流量kg/hG=35輸入介質平均比熱kj/（kg）C=896輸入介質始端溫度t1=95輸入介質終端溫度t2=70輸入管道輸送長度mL=1000輸入平面保溫層到周遭空氣的放熱系數W/（m2k）h1=0.344輸入管道支吊架局部保溫系數K1=1.2輸入當（t1-tk）/（t2-tk）2時TRUE設管道主保溫層外徑為d1:

d1=0.2290則保溫層厚度為:

m=0.0050當（t1-tk）/（t2-tk）2時FALSE設管道主保溫層外徑為d1:

d1=0.2227則保溫層厚度為:

m=0.0018（四）.直埋管道的保溫層厚度計算土壤的導熱系數W/mt=1.74土壤層溫度tt=5埋管深度mh=1.2設管道主保溫層外徑為d1:

d1=0.0442則保溫層厚度為:

m=-0.0874備注tw1=33.4+0.028（t50）（或者根據工藝要求直接輸入）tp=（t+tw1）/2h=11.63+6.950.5d1/dwln（d1/dw）=21（t-tw1）/hdw（tw1-tk）見後面附表1見後面附表1=（d1-dw）/2=（x-1）dw/2此計算方法計算保溫層濃度時,外表面溫度未知,平均溫度查附表2查附表3查附表4ln（d1/dw）=23.141（t-tk）/qh1=2.69dw1.211.35tw11.73/q1.5室內取0.086,室外取0.344吊架室內1.10,室外1.15;支架室內1.15,室外1.20當（t1-tk）/（t2-tk）2時,用下面公式計算ln（d1/dw）=23.141（tp-tk）LK1/GC（t1-t2）h1=（d1-dw）/2當（t1-tk）/（t2-tk）2時，用下面公式計算ln（d1/dw）=23.141（t2-tk）LK1/GC（t1-tk）h1=（d1-dw）/2管管道道保保溫溫層層厚厚度度的的計計算算方方法法（三三種種方方法法）一般可取1.74W/m一般可取5lnd1=1（tw1-tt）ln（dw）+1（t-tw1）ln（4h）/t（tw1-tt）+1（t-tw1）=（d1-dw）/2xx與與xlnxxlnx函函數數表表（當當x=1x=155時時的的xlnx）xlnx）值值xxxlnxxlnxxxxlnxxlnxxxxlnxxlnxxxxlnxxlnxxx10.0001.420.4992.141.632.863.0023.581.0050.0051.430.5122.151.6482.873.0213.591.010.010051.440.5262.161.6652.883.0453.61.0150.015151.450.5392.171.6812.893.0653.611.020.02021.460.5522.181.6992.93.0853.621.0250.2531.470.5652.191.722.913.1043.631.030.03041.480.582.21.7352.923.133.641.0350.03561.490.5942.211.7562.933.153.651.040.04071.50.6072.221.7712.943.173.661.0450.0461.510.6222.231.7912.953.193.671.050.05121.520.6372.241.8052.963.213.681.0550.05651.530.652.251.8252.973.243.691.060.06171.540.6652.261.8412.983.253.71.0650.0671.550.6792.271.8612.993.273.711.070.07241.560.6952.281.8833.293.721.0750.07771.570.7082.291.8993.013.313.731.080.08311.580.7222.31.923.023.343.741.0850.08851.590.7372.311.9353.033.363.751.090.09461.60.7512.321.9553.043.383.761.0950.09941.610.7652.331.973.053.43.771.10.10481.620.7822.341.993.063.423.781.1050.111.630.7992.352.0073.073.443.791.110.11621.640.8152.362.0273.083.463.81.1150.121.1.650.8272.372.0423.093.483.811.120.127.1.660.8422.382.0623.13.53.821.1250.13271.670.8562.392.083.113.533.831.130.1381.680.8722.42.13.123.553.841.1350.1431.690.8892.412.123.133.573.851.140.14921.70.9022.422.143.143.593.861.1450.15451.710.9162.432.163.153.613.871.150.16071.720.9322.442.183.163.643.881.1550.16651.730.9492.452.1953.173.663.891.160.17211.740.9652.462.2173.183.683.91.1650.17721.750.982.472.2333.193.73.911.170.18461.760.9942.482.2553.23.723.921.1750.1891.771.0112.492.273.213.743.931.180.1951.781.0292.52.293.223.763.941.1850.2011.791.042.512.313.233.783.951.190.2071.81.0592.522.3283.243.813.961.1950.2131.811.0812.532.3443.253.833.971.20.2181.821.0892.542.373.263.853.981.2050.251.831.1082.552.3853.273.883.991.210.231.841.1212.562.4053.283.941.2150.2361.851.1382.572.4253.293.924.011.220.2421.861.1522.582.4443.33.944.021.2250.2451.871.1692.592.4623.313.964.031.230.25451.881.1852.62.483.323.984.041.2350.2611.891.2052.612.5033.3344.051.240.2661.91.222.622.5213.344.034.061.2450.2721.911.2342.632.543.354.054.071.250.2791.921.2512.642.563.364.074.081.2550.2851.931.272.652.583.374.094.091.260.2911.941.2882.662.63.384.124.11.2650.2981.951.3022.672.623.394.144.111.270.341.961.3182.682.643.44.164.121.2750.3091.971.3352.692.663.414.184.131.280.3161.981.3512.72.683.424.24.141.2850.3221.991.3692.712.73.434.234.151.290.32821.3862.722.723.444.254.161.2950.3342.011.4012.732.743.454.274.171.30.342.021.4192.742.763.464.34.181.310.3542.031.4392.752.783.474.324.191.320.3672.041.4552.762.83.484.344.21.330.382.051.4712.772.823.494.364.211.340.3892.061.4882.782.843.54.384.221.350.4052.071.5072.792.863.514.44.231.360.4172.081.522.82.883.524.424.241.370.4322.091.5422.812.9013.534.454.251.380.4452.11.5592.822.9213.544.474.261.390.4572.111.5792.832.943.554.54.271.40.472.121.5922.842.9613.564.524.281.410.4852.131.612.852.983.574.554.29xlnxxlnxxxxlnxxlnx4.574.36.274.594.316.294.624.326.324.644.336.354.664.346.384.684.356.44.714.366.424.734.376.444.754.386.464.774.396.484.84.46.524.824.416.544.844.426.574.864.436.64.884.446.624.914.456.644.934.466.674.964.476.74.984.486.7254.496.745.034.56.775.054.516.795.074.526.815.094.536.835.124.546.865.154.556.95.174.566.925.194.576.945.214.586.975.244.596.995.264.67.025.284.617.055.314.627.075.334.637.15.354.647.1253.74.657.145.44.667.165.434.677.195.454.687.215.474.697.245.54.77.265.534.717.285.554.727.325.574.737.355.64.747.385.624.757.45.644.767.425.664.777.455.684.787.475.714.797.55.744.87.525.764.817.555.784.827.585.814.837.65.834.847.635.854.857.655.884.867.685.914.877.75.934.887.735.954.897.765.984.97.786.014.917.86.034.927.836.054.937.856.074.947.866.14.957.96.134.967.926.154.977.956.174.9886.194.998.026.2258.056.25附附表表2:

2:

保保溫溫層層平平均均溫溫度度tptp周遭空氣溫度（）介質溫度10015020025030035040025709512515017520523015659012014517020022506080110135160190215-155575105130155185210附附表表3-1:

3-1:

季季節節運運行行工工況況允允許許最最大大散散熱熱損損失失設備、管道及附件外表面溫度50100150200250300允許最大散熱損失116163203244279308附附表表3-2:

3-2:

常常年年運運行行工工況況允允許許最最大大散散熱熱損損失失設備、管道及附件外表面溫度323（50）373（100）423（150）473（200）523（250）573（250）允許最大散熱損失5893116140163186附附表表4:

4:

保保溫溫層層表表面面熱熱阻阻公稱直徑（mm）室內室外介質溫度t（）介質溫度t（）100200300400500100200300圓筒面放熱阻力R2（m2K/w）250.3010.2580.2150.1980.1890.1030.0950.086320.2750.2320.1980.1630.1380.0950.0860.077400.2580.2150.1810.1550.1290.0860.0770.069500.1980.1630.1380.120.1030.0690.060.0521000.1550.1290.1120.0950.0770.0520.0430.0431250.1290.1120.0950.0770.0690.0430.0340.0341500.1030.0860.0770.0690.060.0340.0260.0262000.0860.0770.0690.060.0520.0340.0260.0262500.0770.0690.060.0520.0430.0260.0170.0173000.0690.060.0520.0430.0430.0260.0170.0173500.060.0520.0430.0430.0430.0170.0170.0174000.0520.0430.0430.0340.0340.0170.0170.0175000.0430.0340.0340.0340.0340.0170.0170.0176000.0360.0340.0320.030.0280.0140.0130.0137000.0330.0310.0290.0280.0260.0130.0120.0118000.0290.0280.0250.0250.0230.0110.010.019000.0260.0250.0250.0220.0220.010.0950.09510000.0230.0220.0220.0210.0210.0090.0860.08620000.0140.0130.0120.0110.010.0050.0040.004623（350）2094005000.0770.0770.0690.060.060.0520.0430.0430.0340.0340.0260.0260.0260.0260.0170.0170.0170.0170.0170.0170.0170.0170.0170.0170.0170.0170.0120.0110.010.010.0950.0950.0860.0860.0080.008介質溫度t（）0.0040.004