副本自制螺旋板式換熱器傳熱計算

螺旋板式換熱器傳熱計算,,,,,

參數(shù),,,,,

熱側(cè),,冷測,,,

介質(zhì),蒸汽,介質(zhì),硫酸鋅溶液,,

進(jìn)口溫度T1℃,出口溫度T2℃,進(jìn)口溫度t1℃,出口溫度t2℃,,

158.8,100,55,90,,

質(zhì)量流量W1kg/h,體積流量V1m3/h,質(zhì)量流量W2kg/h,體積流量V2m3/h,,

6822,2152,,90,,

密度ρ1kg/m3,比熱Cp1kj/kg℃,密度ρ2kg/m3,比熱Cp2kj/kg℃,,

3.17,4.21,1350,3.35,,

動力粘度μ1mpa·s,導(dǎo)熱系數(shù)λ1W/m·℃,動力粘度μ2mpa·s,導(dǎo)熱系數(shù)λ2W/m·℃,,

0.277,0.682,5,0.585,,

污垢熱阻系數(shù)Z1㎡·℃/W,流速ωm/s,污垢熱阻系數(shù)Z2㎡·℃/W,流速ωm/s,,

0.000062,25,0.000123,1.2,,

質(zhì)量流量W1kg/h,6822,質(zhì)量流量W2kg/h,121500,,

體積流量V1m3/h,2152,體積流量V2m3/h,90,,

金屬導(dǎo)熱系數(shù)λwW/m·℃,17,傳熱系數(shù)K查表,1350,,

二.計算,,,,,

1.對數(shù)平均溫差,,,,,

,,,,,,

熱側(cè),,冷側(cè),,,

T1,T2,t1,t2,,

158.8,100,55,90,,

Δtm,56.06051169,℃,,,

,,,,,,

2.傳熱量,Q=W·Cp（進(jìn)口溫度-出口溫度）/3600(W),,,,

,流量,比熱,溫度差,,

熱側(cè),6822,4.21,58.8,,

冷側(cè),121500,3.35,35,,

熱側(cè)Q1,469.10346,w,,,

冷側(cè)Q2,3957.1875,w,,,

3.換熱面積,根據(jù)手冊選取傳熱系數(shù)K,1350,W/m2℃,,

估算面積,,52.28725018,m2,,

,,,,,,

加富裕量,10%,58,㎡,,

圓整為,,60,㎡,,

4.確定板寬,H,1.219,m,,

5.通道間距,,,,,

,,,,,,

,體積流量,介質(zhì)流速,通道間距m,圓整m,

熱側(cè)b1,2152,25,0.01961535,0.02,

冷側(cè)b2,90,1.2,0.017090511,0.018,

6.雷諾數(shù),,G-質(zhì)量流速kg/m2sG=W/(H·b),,,

,,de-當(dāng)量直徑de=2b,,,

液體介質(zhì),質(zhì)量流速G,動力粘度μPa·s,質(zhì)量流量Wkg/s,當(dāng)量直徑de,雷諾數(shù)

熱側(cè),77.72764561,0.000277,1.895,0.04,11224

冷側(cè),1538.146021,0.005,33.75,0.036,11075

蒸汽冷凝雷諾數(shù)計算,,冷凝負(fù)荷Г=W/2L(kg/m·s),0.0385,蒸汽雷諾數(shù)Re,

,,板長L=A/H/2(m),24.6103,556,

冷側(cè)雷諾數(shù)計算,,計算結(jié)果,,,

,,11074.65135,,,

7.普朗特數(shù),,蒸汽冷凝潛熱,蒸汽密度ρ1,3.17,

,,2086,冷凝水密度ρ1,958,

液體介質(zhì),比熱Cpj/kg·℃,動力粘度μPa·s,導(dǎo)熱系數(shù)λ,普朗特數(shù),

熱側(cè)Pr1,4210,0.000277,0.682,1.71,

冷側(cè)Pr2,3350,0.005,0.585,28.63,

8.傳熱膜系數(shù),,,,,

,,,,,,

液體介質(zhì),雷諾數(shù),普朗特數(shù),導(dǎo)熱系數(shù)λ,傳熱膜系數(shù),

熱側(cè)α1,11224,1.71,0.682,1191,

冷側(cè)α2,11075,28.63,0.585,3657,

蒸汽冷凝傳熱膜系數(shù)計算Re＞2100時查表，Re＜2100時用此公式計算,立式,,,116,

,臥式,,,120,

9.污垢熱阻系數(shù),查表,,,,

熱側(cè)Z1,0.000062,m2·t/w,查表取值,,

冷側(cè)Z2,0.000123,m2·t/w,查表取值,,

10.金屬熱阻,Z=δW/λW,,,,

取螺旋板板厚為,0.003,m,自取值,,

查金屬導(dǎo)熱系數(shù),17,W/m·t,查表取值,,

計算得金屬熱阻,0.000176471,m2·t/w,,,

11.傳熱系數(shù),計算得,,108.0426001,,

,,,,,,

12.合理性,0.080031556,,,,

13.計算換熱面積,,得到,653.3329229,,

,,,,,,

14.選取換熱面積,A選=1.1A計算,得到,718.6662152,,

,,,,,,

15.計算壓降,,,,,

飽和水蒸氣冷凝壓降計算（例題計算方法）,,,,,

,,,,,,

,計算結(jié)果,7.6696E-07,MPa,,

飽和水蒸氣冷凝壓降計算（紅皮書計算方法）,,,,,

,,,,,,

,計算結(jié)果,9.9422E-