In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter5 cm. Find the total radiating surface in the system.
Height (h) of cylindrical pipe = Length of cylindrical pipe = 28 m
Radius (r) of circular end of pipe = 
= 2.5 cm
= 0.025 m
CSA of cylindrical pipe = 2πrh
= 2 * 
* 0.025 * 28 m2
= 4.4 m2
The area of the radiating surface of the system is 4.4 m2
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