管道熱損失的計(jì)算方法

架空管線供熱管道熱損失計(jì)算,,,,,,管道出水溫度計(jì)算架,,,,,,,

一、從熱媒到管內(nèi)壁的熱阻,,,,備注,,一、管道內(nèi)流體流量的計(jì)算,,,,備注,,,

從熱媒到管內(nèi)壁的放熱系數(shù)W/m2·℃,αn=,7000,輸入,,,管路的流速（m/s）,v=,0.8,輸入,,,,

管道內(nèi)徑m,dn=,0.05,輸入,,,管道內(nèi)徑（m）,dj=,0.05,輸入,,,,

從熱媒到管內(nèi)壁的熱阻m·℃/W,Rn=,0.000909918,,Rn=1/(3.14×αn×dn),,管道的流量（kg/s),q=,1.57,,q=dj*dj*3.14*v/4,,,

二、管壁的熱阻,,,,,,二、管內(nèi)流體流動時管道出水溫度的確定,,,,,,,

管材的導(dǎo)熱系數(shù)W/m·℃,λg=,50,輸入,,,水的進(jìn)口溫度（℃）,ti=,60,輸入,,,,

管道外徑m,dw=,0.06,輸入,,,管道的散熱量（J/s）,ΔQ=,3733.387763,輸入,,,,

管壁的熱阻m·℃/W,Rg=,0.000580642,,Rb=ln(dw/dn)/(2×3.14×λg),,管道的出口溫度（℃）,tc=,59.43111149,,ΔQ=4.18*1000*q*(ti-tc),,,

三、保溫材料的熱阻,,,,,,二、管內(nèi)流體靜止時管道出水溫度的確定,,,,,,,

保溫材料的導(dǎo)熱系數(shù)W/m·℃,λb=,0.03784,輸入,,,水的進(jìn)口溫度（℃）,ti=,60,輸入,,,,

保溫層外表面的直徑m,dz=,0.1,輸入,,,管道的散熱量（J/s）,ΔQ=,3733.387763,輸入,,,80641.17568,5.89051685

保溫材料的熱阻m·℃/W,Rb=,2.149621032,,Rb=ln(dz/dw)/(2×3.14×λb),,管道靜止時間（h）,T=,1,輸入,,,,

四、從管道保溫層外表面到周圍介質(zhì)的熱阻,,,,,,管道內(nèi)流體的容積（kg）,M=,294.375,,,,,

保溫層外表面附近空氣的流動速度m/s,v=,2,輸入,,,管道的出口溫度（℃）,tc=,49.07734053,,ΔQ=4.18*M*(ti-tc),,,

保溫層外表面對空氣的放熱系數(shù)W/m2·℃,αw=,20.01421356,,αw=11.6+7×v0.5,,,,,,,,,

從保溫層外表面到周圍介質(zhì)的熱阻m·℃/W,Rw=,0.159122584,,Rw=1/(3.14×dz×αw),,,,,,,,,

五、供熱管道的散熱損失,,,,,,,,,,,,,

管道中熱媒的溫度℃,t=,60,輸入,,,,,,,,,,

管道周圍環(huán)境(空氣)溫度℃,t0=,14,輸入,,,,,,,,,,

管道的長度m,L=,150,輸入,,,,,,,,,,

管道附件的散熱損失系數(shù),β=,0.25,輸入,主要是閥門、補(bǔ)嘗器、支座的損失地上敷設(shè)取0.25,,,,,,,,,

供熱管道的散熱損失W,ΔQ=,3733.387763,,ΔQ=(t-t0)×(1+β)×l/(Rn＋Rg+Rb+Rw),,,,,,,,,

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公稱直徑（mm）,外徑（mm）,普通鋼管,,加厚鋼管,,公稱,管系列,,,,,,

,,公稱壁厚（mm）,理論重量（kg/m）,公稱壁厚（mm）,,外徑,S5,S4,S3.2,S2.5,,,

6,10.2,2,0.4,2.5,,dn,公稱壁厚,,,,,,

8,13.5,2.75,0.68,2.8,,20,2,2.3,2.8,3.4,,,

10,17.2,3.5,0.91,2.8,,25,2.3,2.8,3.5,4.2,,,

15,21.3,3.15,1.28,3.5,,32,2.9,3.6,4.4,5.4,,,

20,26.9,3.4,1.66,3.5,,40,3.7,4.5,5.5,6.7,,,

25,33.7,4.25,2.41,4,,50,4.6,5.6,6.9,8.3,,,

32,42.4,5.15,3.36,4,,63,5.8,7.1,8.6,10.5,,,

40,48.3,4,3.87,4.5,,75,6.8,8.4,10.3,12.5,,,

50,60.3,5,5.29,4.5,,90,8.2,10.1,12.3,15,,,

65,76.1,5.25,7.11,4.5,,110,10,12.3,15.1,18.3,,,

80,88.9,4.25,8.