A brass pipe of inner radius 4.0 cm and outer radius 4.4 cm carries steam at 100°C through a water bath at 25°C. Assume steady radial conduction with k = 110 W / ( mK ) . Find the heat lost per metre

Question

A brass pipe of inner radius 4.0 cm and outer radius 4.4 cm carries steam at 100°C through a water bath at 25°C. Assume steady radial conduction with k = 110 W / ( mK ) . Find the heat lost per metre of pipe in 1 s , in MJ (three decimals).

TestHub · Accepted Answer

t Q ​ = l n ( r 1 ​ Δ 2 ​ ) 2 πk L Δ T ​ = l n 1.1 2 π ( 110 ) ( 1 ) ( 75 ) ​ . ln 1.1 = 0.09531 , so power = 543869 W. Heat in 1 s = 0.544 MJ.

Physics - Heat & Thermo Question with Solution | TestHub

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