電加熱設計資料

9電熱設計資料計量單位功率：W、kW 1kW=3.412BTU/hr(英熱單位/小時)=1.36(馬力)=864Kcal/hr重量：kg流速：m/minm3/min、kg/h5.比熱：Kcal/(kg℃)

1kg=2.204621b(磅)1kcal/(kg℃)=1BTU/hr.oF=4186.8J/(Kg℃)功率密度：W/cm2壓力：MPa導熱系數(shù)：W/(m℃)

1W/c=6.4516W/in21W/(m℃)=0.01J/(cms℃)=0.578Btu/(ft.h.F)9.溫度：℃ 1oF=9/5℃＋321R=9/5℃＋491.671K=1℃＋273.15電加熱功率計算加熱功率的計算有以下三個方面：運行時的功率 啟動時的功率 統(tǒng)中的熱損失全部的計算應以最惡劣的狀況考慮：

最短的運行周期加熱介質(zhì)的最大重量〔流淌介質(zhì)則為最大流量〕設計電加熱器系統(tǒng)的步驟〔不涉及材料形式及規(guī)格〕。計算工藝過程所需的熱量。計算系統(tǒng)起動時所需的熱量準時間。打算發(fā)熱元件的護套材料及功率密度。系統(tǒng)起動時所需要的功率：系統(tǒng)運行時所需要的功率：管道平面式中符號，含義如下：P功率：kWm1介質(zhì)重量：kg介質(zhì)比熱：kcal/kg℃m2容器重量：kgc2介質(zhì)比熱：kcal/kg℃m3每小時增加的介質(zhì)重量或流量:kg/hc3介質(zhì)比熱：kcal/kg℃h加熱時間：h

QW/m；W/m2λ 保溫材料的導熱數(shù)：W/mkδ 保溫材料厚度：mmd管道外徑：mmL管道長度：mS系統(tǒng)的散熱面積：m2△T介質(zhì)和環(huán)境溫度之差或溫升：℃有關加熱功率計算的參考數(shù)據(jù)〔如需更多數(shù)據(jù)，請來電、來函詢問〕各種物質(zhì)的比熱〔25℃〕cal/(g℃)kcal/(kg℃)物質(zhì)比熱物質(zhì)比熱物質(zhì)比熱物質(zhì)比熱氫氣3.41乙醇0.55導熱油0.46玻璃0.200水1.00丙醇0.67二氧化碳0.24銀0.056冰0.50丁醇0.69氨0.52錫0.051酒精0.58丙酮0.51空氣0.24汞0.033甘油0.58石油0.52軟木塞0.49鋅0.090乙醚0.56石蠟0.77瀝青0.40鋁0.215煤油0.51蜂蠟0.82硬橡膠0.34爐渣0.180機油0.40醋酸0.42ABS0.35鎳0.106松香水0.42硫磺0.24陶瓷0.26鋼0.120氮氣0.25硫酸0.34混凝土0.21生鐵0.130苯0.34橄欖油0.47巖鹽0.22鐵0.118甲苯0.44蓖麻油0.43無定形碳0.17黃銅0.090萘0.40自然氣0.60硫0.18銅0.092甲醇0.60氯化氫0.20水泥0.19石墨0.174各種氣體和蒸汽的定容定壓比熱cal/(g℃)kcal/(kg℃)物質(zhì)溫度〔℃〕定壓比熱〔Cp〕定容比熱〔Cv〕氫163.412.42氦181.250.75氨200.510.39水蒸汽100-3000.470.36酒精蒸汽108-2200.450.40乙醚蒸汽25-1110.430.40氮200.250.18一氧化碳180.250.18空氣20-1000.240.17氧200.220.16二氧化碳200.200.15氯化氫22-2140.190.13物質(zhì)比重物質(zhì)比重物質(zhì)比重物質(zhì)比重氫0.00009甲烷0.00078氦0.00018乙炔0.00117氖0.00090一氧化碳0.00125氮0.00125空氣0.00129氧0.00143一氧化氮0.00134氟0.001696硫化氫0.00154氬0.00178二氧化碳0.00198臭氧0.00214二氧化氮0.00198氯0.00321氰0.00234氪0.00374二氧化硫0.00293氙0.00589溴化氫0.00364氡0.00973碘化氫0.00579煤氣0.00060氨0.0007液體〔g/cm3〕汽油0.70橄欖油0.92硝酸1.50乙醚0.71魚肝油0.95硫酸1.80石油0.76蓖麻油0.97溴3.12酒精0.79純水1.00水銀14.20木精0.80海水1.03煤油0.80醋酸1.05松節(jié)油0.86鹽酸1.20苯0.88無水甘油1.26礦油0.9-0.93二硫化碳1.29植物油0.9-0.93蜂蜜1.40固體〔常溫g/cm3〕鑄鋼7.80鉛11.34有機玻璃1.18碳鋼7.80-7.85鎂1.738石灰石2.60-3.0鑄鐵6.80-7.20鋅7.133瀝青0.90-1.50鋁2.70鉻7.19白磷1.82銀10.49錳7.43碳1.90-2.30金19.302鈉0.97銅8.93鎢19.254康銅8.90鉭16.60鎳8.90錫5.765鎳鉻8.40鉑21.45各種物質(zhì)的溶點溶解熱沸點和汽化熱物質(zhì)溶點(℃)溶解熱〔cal/g〕沸點〔℃〕汽化熱〔cal/g〕乙醚-11723.543584酒精-11423.5478204二硫化碳-11245.346.2584冰080100539各種保溫材料的導熱系數(shù)和最高使用溫度材料巖棉

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常溫下的導熱系數(shù)〔W/mk〕0.0360.044礦渣棉3500.040膨漲珍寶巖5500.047聚氨脂泡沫塑料800.024聚苯稀泡沫塑料600.031硅酸鈣5500.054復合硅酸鹽氈FHP-VB7000.024復合硅酸鹽FHP-V涂料7000.024硅酸鋁〔干法制造〕4000.046硅酸鋁〔濕法制造〕8000.046注：準確的數(shù)據(jù)請查供給商的說明書不同溫度下，不同管徑的保溫材料的厚度管道直徑/公稱直徑/毫米管道溫度〔℃〕255075100125150175202325250275300325350375400425450材料管道直徑/公稱直徑/毫米管道溫度〔℃〕2550751001251501752023252502753003253503754004254501/2″/15/21.342530303040505050606060808080808080803/4″/20/26.672530304040505060606070808080808080801″/25/33.402530404040506060607070808080808080801/2″/40/48.262530404050506060707070909090909090902″/50/60.33304040505060607070707090901001001001202303″/80/88.903040405050607070708080901101101202301301504″/100/1140330405050506070808090901001001101202301301606″/150/168.330405060707080801001001001101301301301301601608″/200/219.1405050607080809010010010011013013013015017018010″/250/273.14050606070808010010010012023014014017017018019012″/300/323.94050606070808010010010012023014017017018019020014″/350/355.64060606070808010010010014014017017018019020230016″/400/406.44060608080809010010010014015017018018019020231018″/450/457.2406060808090901001001101501601701801801902221020″/500/508.060606080909010010010012023016018019020231022023024″/600/609.6060606080909010010010012023017019020230021022023026″/650/660.406060601001009010013013014020230020230020231022023028″/700/711.206060701001009011013013014020230020230020231022023030″/750/762.060607010010010011013013017020230020230020231022028036″/900/91404070709010010010011016017018020230020230020231022028040″/1000/1016.070709010010010011017018019020230020230020238028029042″/1050/1066.8070709010010010011017018019020230020230028028029030048″/1200/1219.2070709010010010011017019019020230020230029030030030054″/1350/1371.607054″/1350/1371.60707010010010010015018019019020230020238030030030030060″/1500/1524.00707010010010010016018020230020230028028030030030030066″/1650/1676.80707010010010010017019020230020230028030030030030030072″/1800/1828.807080100100100100170190202300202300280300300300300300罐