The dimensions of cylindrical pipe
Diameter = 5cm
Radius = 5/2 = 2.5cm
Height = 28m = 2800cm
We know that
Total radiating surface in the system = curved surface area of cylindrical pipe = 2 πrh
By substituting the values
Total radiating surface in the system = 2 × (22/7) × 2.5 × 2800
So we get
Total radiating surface in the system = 44000 cm2
Therefore, the total radiating surface in the system is 44000 cm2.