A large aluminium plate (k = 210 W/m.K) of thickness 0.15 m, initially at a uniform temperature of 300 K, is placed in a furnace having an ambient temperature of 800 K with h = 500 W/ m 2 .K. (a)...

A large aluminium plate (k = 210 W/m.K) of thickness 0.15 m, initially at a uniform temperature of 300 K, is placed in a furnace having an ambient temperature of 800 K with h = 500 W/ m².K.

(a) Calculate the time required for the plate mid-plane to reach 700 K.

(b) What is the surface temperature of the plate for this condition ? Take