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CatRunner
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Homework Statement
We have 5 cm of external diametre tubing with 200*C of superficial temperature. The boundary temperature is 20*C and the convective heat transfer coefficient is 3.0 W/m^2*C
What is the heat loss
Homework Equations
q = U*A*(T1-T2)
1/U = 1/h1 + [r1 * ln (r2/r1)]/k1 + r1/r2*h2
The Attempt at a Solution
Okay, my problem is that I don't have a k value for the tubing, nor do I have the thickness of the tubing (or alternately, an inside and outside diametre). The only information I have is given (outside diametre, two temperatures, and the convective heat transfer coefficient).
I just have no idea how to tackle this without a k value or a tube/pipe thickness.
Thanks for any assistance