Consider an oven flat wall with three layers A, B and C as shown in the figure. The thickness of layer A, B and C are 12, 4 and 8 in., respectively, and their thermal conductivities are 0.78 , 0.08 and 0.48Btu/hft2F, respectively. Neglecting the thermal resistance of the joints, calculate (a) Heat loss from the oven (b) Temperature at the joints (T2 and T3) Consider an oven flat wall with three layers A, B and C as shown in the figure. The thickness of layer A, B and C are 12, 4 and 8 in., respectively, and their thermal conductivities are 0.78 , 0.08 and 0.48Btu/hft2F, respectively. Neglecting the thermal resistance of the joints, calculate (a) Heat loss from the oven (b) Temperature at the joints (T2 and T3)