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【单选题】
某化工厂用一热交换器,每小时冷凝3.4t.h-1工业酒精。已知酒精温度80°C,汽化潜热为1072kJ.kg-1,酒精蒸汽在管外冷凝,测得其α0=2268w.m-2.K-1,冷却水在管内流动,水流速度为0.4 m.s-1,进口水温度为20°C,流量为34500kg.h-1, 钢管规格:φ30×2.5mm,长2m,钢管导热系数46.5w.m-1.K-1,设过程无热损失,并忽略垢层热阻,试求传热速率=( )W。 (水的ρ=1000kg.m-3 , Cp=4.18kJ.kg-1.K-1, μ=1cp, λ=0.65w.m-1.K-1)A.
1.012×10^6
B.
1.012×10^3
C.
3.645×10^6
D.
3.645×10^3
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