A dormitory at a large university, built 50 years ago, has exterior walls constructed of L- 30-mm thick sheathing with a thermal conductivity of ks - 0.1 W/m K. Determine

the heat flux through the walls in W/m2 when the interior and exterior air temperatures are Tj 22°C and To.o- 15°C, respectively.The inner and outer convection heat transfer coefficients are hi -5 W/m2-K and h. - 30 W/m2 K, respectively.