Chapter 1, Problem 1.53P

In one stage of an annealing process, 304 stainless steelsheet is taken from 300 K to 1250 K as it passes through an electrically healed oven at a speedof $V_s=10\text{ mm}/\text{s}$ . The sheet thickness and width are $t_s=8\text{ mm}$ and $W_s=\text{2 m}$ , respectively, while theheight, width, and length of the oven are $H_o=2\text{ m},W_o=\text{2}.\text{4 m},$ and $L_o=\text{25 m}$ . respectively. The top andfour sides of the oven are exposed to ambient airand large surroundings, each at 300 K, and the corresponding surface temperature, convection coefficient,and emissivity are $T_s=\text{35}0\text{ K},h=10\text{ W}/{\text{m}}^{\text{2}}\cdot \text{K},$ and $\in =0.8$ . The bottom surface of the oven is also at350 K and rests on a 0.5-m-thick concrete Pad whose base is at 300 K. Estimate the required electric powerinput, $P_{elec}$ to the oven.