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NG ±âü Ãⱸ¿Âµµ : 25¡É
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3-1 Required Heat Transfer Surface Area
[Formula]
Q x q1 Q x q2
S = ----------- + ---------
U1 x Tem1 U2 x Tem2
S : Required Heat Transfer Surface Area (m^2)
Q : Flow Capacity (Nm^3/H)
q1 : Latent Heat of Vaporization (Kcal/Nm^3)
q2 : Specific Heat (Kcal/Nm^3)
U : Over-all Coefficient of Heat Transfer (Kcal/m^2h¡É)
Tem : Logarithmic Mean Temperature Difference (¡É)
note) foot number 1 means liquid status
foot number 2 means vapor status
q1 = 122.0 Kcal/Nm^3 (latent heat)
q2 = 78.5 Kcal/Nm^3 (Specific heat)
Tem1 = Ta1 - T1 = 60 - (-163) = 223¡É
Tem2 = (Ta1-T1)-(Ta2-T2)/ln[(Ta1-T1)/(Ta2-T2)]
= [ (60-(-163))-(40-(25))] / ln[(60-(-163))/(40-(25))]
= 77.1 ¡É
Ta1 : Water Inlet Temperature (¡É) =60
Ta2 : Water Outlet Temperature (¡É)=40
T1 : Liquid Temperature (¡É)=-163
T2 : Vapor Temperature (¡É)=+25
U1 = 300.0 (Kcal/m^2h¡É)
U2 = 145.0 (Kcal/m^2h¡É)
3161.2 x 122 3161.2 x 78
S = ------------ +--------------- =28.0m^2
300 x 223 145 x 77.1