Q$1)$ Steam in a heating system flows through a tube whose outer diameter is $8$ cm and whose outer walls are maintained at a temperature of $220C.$ Circular $($Annular$)$ fins $\frac{W}{m}K)$ of outer diameter $10$ cm and constant thickness $2$ mm are attached to the tube. Heat is transferred to the surrounding air at $T=25C,$ with a heat transfer coefficient of $40\frac{W}{m^2}K.$ Determine the heat transfer from the finned tube of length $1\mathrm{.}5$ m having $250$ fins. $(10,$ CLO$2)$