A Cupola furnace wall consist of the following. The finst layer, face fire brick is $20$ p thermal conductivity of $0\mathrm{.}4\frac{W}{m}K.$ The second layer is a protective steel frame $4$ p thermal conductivity of $55\frac{W}{m}K.$ A third layer of $12cm$ inulation blanket of thermal and $0\mathrm{.}3\frac{W}{m}K.$ The inside temperature $($face temperature$)$ during the drying cycle was men angan$)\text{'}$C and outside temperature $80C.$

$1\mathrm{.}1$ Draw the multilayer furnace wall from the question, $$so show the heat loss proflie and hir if resistance of each brick layer.

$1\mathrm{.}2$ Calculate the rate of heat loss $(Q$ in Watt$)$ through one wall of the furnace with a face surface area of $5m$ by $4m.$

$(20)$

$1\mathrm{.}3$ Convert your answer In $1\mathrm{.}2$ to killowatt hour.

$1\mathrm{.}4$ Also calculate the interface temperature of layers $(T_3-T_4).$ insulation.

$(4)$