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A composite wall is composed of 5 sections as represented in the below Fig. 1. The temperature at the left side is 170° C and at the right side is 750° C and h = 15 W/m² K on both sides. The coefficient of heat transfer are k₁ =k3 = 78 W/mK, k₂ = 115 W/mK, k4 = 100 W/mK, and ks = 145 W/mK. Determine: a. The total thermal resistance Heat transfer rate through the composite. 24 cm Figure 1 Composite Wall 8 cm 6 cm 2 cm (6 marks) (2 marks)

Fig: 1