In one stage of an annealing process, 304 stainless steel
Chapter , Problem 1.53(choose chapter or problem)
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 Vs 10 mm/s. The sheet thickness and width are ts 8 mm and Ws 2 m, respectively, while the height, width, and length of the oven are Ho 2 m, Wo 2.4 m, and Lo 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 s 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, Pelec, to the oven.
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