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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)