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//Variable declaration:
Q = 12700.0 //Heat transfer rate (W)
Ud = 2220.0 //Dirty overall heat transfer coefficient (W/m^2.K)
DTlm = 47.0 //Log mean difference temperature (u00b0C)
rii = 0.013 //Inner radius of inner %pipe of the double %pipe heat exchanger (m)
//Calculation:
A = Q/(Ud*DTlm) //Heat transfer area (m^2)
L = A/(2*%pi*rii) //Tube length (m)
//Result:
printf("The heat transfer area is : %.4f m^2.",A)
printf("The length of the heat exchanger is : %.2f m.",L)
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