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A 20 mm diameter copper pipe is used to ...

A 20 mm diameter copper pipe is used to carry heated water. The external surface of the pipe is at `T = 80^(@)C` and its surrounding is at `T_(0) = 20^(@)C`. The outer surface of the pipe radiates like a black body and also loses heat due to convection. The convective heat loss per unit area per unit time is given by `h(T – T_(0))` where h = 6 W `(m^(2)K)^(-1)`. Calculate the total heat lost by the pipe in unit time for one meter of its length.

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The correct Answer is:
`51.7 Wm^(-1)`
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