- #1
sdaniluk
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I am trying to calculate the length of a pipe needed for an air cooling system I have found the following formulas:
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.
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.