The wall of an oven (see the picture below) used to cure plastic parts is of thickness L=0.05 m and is exposed to large surroundings and air at its outer surface. The air and the surrounding are at 27 °C (Too and Tsur in the diagram showing below). If the temperature of the outer surface (i.e., T2 in the diagram shown below) is 127 °C and its convection coefficient and emissivity are h = 20 W/m²K and &= 0.8, respectively. Consider the steady state situation Inner surface Outer surface qrad k=0.7 W/m-K- q' conv cond T₁ L=0.05 m- 111 Too= 27 °C h = 20 W/m²-K T2 = 127 °C &= 0.8 Wall of the oven Tsur = 27 °C 6 points (3) What is the equivalent radiative heat transfer coefficient hr? (4) What is the heat flux food through the wall of the oven by conduction (in the unit of W/m²)? 6 points (5) If the thermal conductivity of the wall of the oven is k = 0.7 W/mK, what is the temperature of the inner surface (i.e., T1 in the picture above) of the oven wall? 6 points