{picture deleted} i used S = (2*pi*L)/(ln(4z/D)) = 242.569 where L = 100m, z = 1

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i used S = (2*pi*L)/(ln(4z/D)) = 242.569 where L = 100m, z = 1m, D = 0.30m ..., but also thought it would be the same if you use L=1m which would be the heat loss per every meter on the pipe and then multiply the S factor by 100. But the answers are not the same. 

q = Sk(T1-T2), for L = 100m the heat loss was 16300.6W, and for L = 1 the heat loss was 86.3 W.

HELP me solve the problem...

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Also for the following problem; i know how to solve it, but the only thing im confused is how do i find the values of N and M for the flux plot?

 got it...

Explanation / Answer

Got it... thanks

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