A cylindrical wall has a temperature of 800 °C on the inside and is exposed to air and room surfaces at 20 °C on the outside. If the wall has an inside radius of 0.25 m, thickness of 10 cm, height of 0.5 m, and thermal conductance of 0.5 W (m-K), and the exposed outside surface has an emissivity of 0.8 and convection coefficient of 15 W (m?²K),
(i) how much heat is transmitted through the wall, and
(ii) what is the temperature of the exposed outside of the wall?