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工作介质DN15~20DN25~32DN40DN50~80DN100~150DN≥200DN15~20DN25~32DN40DN50~80DN100~150DN≥200DN32~40DN50~100DN≥150利用时不利用时从受压容器中排出从无压容器中排出利用时不利用时水泵进口管水泵出口管水泵进口管水泵出口管Dn=594.5*(GU/W)1/2=91.642471450.154150499Dn管子的内径mm91.64247145G介质的质量流量t/h3601.5~3.01.5~3.00.75~1.01.5~2.01.0~2.00.5~1.01.0~2.02.0~3.08015~304030~4030~400.5~1.01~20.5~3.00.2~0.525~3530~4010~1515~2020~2525~35蒸汽管道mm流速ω(m/s)40~6030~5020~40≤1010~1515~20DN＜100过热蒸汽低压高压饱和蒸汽一、锅炉房内及热网管道常用流速表管道种类及条件DN＞200DN100~20020~25给水水泵进口管水泵出口管余压凝结水管P＞0.7*105Pa自流凝结水管凝结水二次蒸汽乏汽废气热网循环水供\回水管二次蒸汽管排气管二、管径计算锻锤废气管给水总管活塞式水泵离心式15~3060U介质比容m3/Kg0.198019802ρ密度Kg/m35.05W介质的流速m/s25Dn=18.8*(Q/W)1/2=145.62417387.745966692Dn管子的内径mm145.6241738W介质的流速m/s2Q介质的容积流量m3/h120绝对大气压饱和温度105Pat(℃)密度(kg/m3)热焓(kJ/kg)密度(kg/m3)11000.582674.89582119.61.112706.19453132.91.622724.593441432.1242737.89255151.112.622747.99166158.083.1112756.29107164.173.627639048169.614.0852768.48989174.534.5682773.189310179.045.051277788911183.25.5312780.688412187.086.0132783.988013190.716.4942786.887514194.136.9742789.387215197.367.4522791.486816200.437.932792.9865Δχ=0.012(tR-ta)lmm=57.96mmtR热媒温度℃179L计算管道的直线长度m300.012钢管的线膨胀系数mm/m*℃管道安装时的温度(一般按-5℃);当管道架空时,室内架空安装应采用室内供暖计算温度,室外架空安装应采用室外供暖计算温度.ta18供暖管道的伸缩计算Δχ水在饱和压力下干饱和蒸汽热水管道mm三、水和蒸汽的热力学性质汽化潜热热焓(kJ/kg)(kJ/kg)415.42259.4502.22203.9558.42165.8601.62136.2636.82111667.12088.7691.22069.3717.52050.6739.12034759.22018.5777.62003794.51989810.71976826.21963.1840.21950.5854.31939水在饱和压力下1kcal=4.187kJ