Question: the electric oven shown in figure 1 is used for...
The electric oven shown in figure 1 is used for the continuous maintenance of a metal sheet from 25ºC to 1000ºC. The furnace and the metal sheet are two-dimensional, that is, wide enough in the Direction perpendicular to the plane of the figure. The speed of the metal sheet is such that every point in it It stays two hours inside the oven. The metal sheet is 1 cm thick, the room temperature is 25 ° C and the temperature of the outer surface of the oven remains uniform at 50 ° C. The coefficient of Heat transfer between the outer surface of the oven and the ambient air is 45 W / m2 - K. The metal is 304 stainless steel
A)Calculate the electric power input to the furnace per unit of width q´´
B) What percentage of this power is lost by convection to the atmosphere?
c) Define a viable thermal insulation for the outer surface of the furnace (material and thickness) to reduce the loss of heat to the atmosphere by 50%.