I am trying to calculate the length of a pipe needed for an air cooling system I have found the following formulas:(adsbygoogle = window.adsbygoogle || []).push({});

R=1/(h*a)

where h is the convection coefficient and a is the surface area.

h=Nu*(k/L)

where Nu is the nusult number and k is the thermal conductivity.

a=π*d*L

where d is the diameter and L is the length.

Putting this together I get:

R=1/[(Nu*(k/L))*(π*d*L)]=1/(Nu*k*π*d)

This seems to imply that the length of the pipe has no impact on the amount of energy lost which I am pretty sure is wrong.

Any help would be appreaciated.

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