In one stage of an annealing process, 304 stainless steel sheet is taken from 300 K to 1250 K as it passes through an electrically heated oven at a speed of V, = 10 mm/s. The sheet thickness and width are ts = 8 mm and W, = 2 m, respectively, while the height, width and length of the oven are Ho = 2 m, Wo = 2.4 m. and Lv = 25 m, respectively. The top and four sides of the oven are exposed to ambient air and large surroundings, each at 300 K, and the corresponding surface temperature, convection coefficient, and emissivity are Ts = 350 K, h = 10 W/m2 . K. and εs, = 0.8. The bottom surface of the oven is also at 350 K and rests on a 0.5-m thick concrete pad whose base is at 300 K. Estimate the required electric power input, Pe1ec> to the oven.

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