$2\mathrm{.}3$ A thick$-$walled tube of stainless steel $)=(19\frac{W}{m}C$ with $2cm$ inner diameter and $4cm$ outer diameter is covered with $3cm-$layer of asbestos insulation $K=0,2\frac{W}{m}C.$ If the inside wall temperature of the pipe is maintained at $600C,$ calculate the heat loss per meter of length and the tube insulation interface temperature.

The temperature at the outer surface being $100C.$

Hint: Use the thermal resistance to determine the heat flow.

$Q_x=\frac{(T_1-T_0)}{{\displaystyle \underset{i=1}{\overset{3}{}}}\frac{l\frac{n^{r_i}}{r_{i+1}}}{2K_{i,(i+1{)}^L}}}$