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//Variable declaration:
U1 = 240 //Overall heat transfer coefficient for first effect (Btu/h.ft^2. F)
U2 = 200 //Overall heat transfer coefficient for second effect (Btu/h.ft^2. F)
U3 = 125 //Overall heat transfer coefficient for third effect (Btu/h.ft^2. F)
A1 = 125 //Heating surface area in first effect (ft^3)
A2 = 150 //Heating surface area in second effect (ft^3)
A3 = 160 //Heating surface area in third effect (ft^3)
T1 = 400 //Condensation stream temperature in the first effect ( F)
T2 = 120 //Vapor leaving temperature in the first effect ( F)
//Calculation:
R1 = 1/(U1*A1) //Resistance across first effect
R2 = 1/(U2*A2) //Resistance across second effect
R3 = 1/(U3*A3) //Resistance across third effect
R = R1+R2+R3 //Total resistance
DT1 = (R1/R)*(T1-T2) //Temperature drop across the heating surface in the first effect ( F)
//Result:
printf("The temperature drop across the heating surface in the first effect is : %.0f F .",DT1)
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