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# Heat Transfer - Composite Wall

## Question

###### Heat Transfer - Composite Wall
A composite wall of an oven consists of three materials. kA = 20 W/m-K, and kC = 50 W/m-K. LA = 0.30 m, LB = 0.15 m, and LC = 0.15 m. The outside surface temperatureof the oven is 20 C and the inside surface temperature is 613 C. The oven air temperature is 800 C, with a heat transfer coefficient h = 25 W/m2-K.

Find kB?

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