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//Variable declaration:
T1 = 210.0 //Initial temperature of oil (.)
T2 = 170.0 //Final temperature of oil (.)
T3 = 60.0 //Surface temperature of oil (.)
m = 8000.0 //Flow rate of oil inside tube (lb/h)
cp = 0.55 //Heat capacity of oil (Btu/lb..)
U = 63.0 //Overall heat teansfer coefficient (Btu.h.ft^2..)
//Calculation:
DT1 = T1-T3 //Temperature difference 1 (.)
DT2 = T2-T3 //Temperature difference 2 (.)
DTlm = (DT1-DT2)/log(DT1/DT2) //Log mean temerature difference (.)
Q = m*cp*(T1-T2) //Heat transferred (Btu/h)
A = Q/(U*DTlm) //Heat transfer area (ft^2)
//Result:
printf("The required heat transfer area is : %.2f ft^2 .",A)
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