Refractory bricks are used as lininas for furnaces because of their thermal properties. consider a thick furnace wall lining with a refractory bricks (k = 1.5 w/m.°c and , α = 5.2 x 10^-7m^2/s), where initially the wall has a uniform temperature of 17°c. if the wall surface is subjected to uniform heat flux of 25 kw/m^2, determine: (a) the temperature at the depth of 15cm from the surface (b) the wall surface after an hour of heating time