C.1 Consider a composite structure shown on below. Conductivities of the layer are: Kk1=k2=ktt=10W/m.K,ks3=16W/m.K, and kss=ks6=46W/m.K. The distance L1,L2,L3 and L4 are 20cm each. Surface area of layer 4.5 and 6 are 0.1m2,0.03 m2 and 0.03m2 respectively. Temperatures on both sides are 100C and 20C. a) Draw the thermal circuit of the composite. b) Calculate the total resistance. c) Caloulate the heat flow through the composite. [4 marks]