Mathematical model of Heat Transfer Coefficient through the annulus gap between concentric pipes filled with solid body:

(1)	$\begin{array}{l}\displaystyle U = \frac{\lambda}{r_{in} \cdot \n (r_{out}/r_{in})}\end{array}$

where

$\begin{array}{l}\lambda\end{array}$	thermal conductivity of the solid body
$\begin{array}{l}r_{out}\end{array}$	inner radius of outer pipe
$\begin{array}{l}r_{in}\end{array}$	outer radius of inner pipe

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