The composite wall of an oven consists of three materials,

Chapter , Problem 3.18

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The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, kA 20 W/m K and kC 50 W/m K, and known thickness, LA 0.30 m and LC 0.15 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB 0.15 m, but unknown thermal conductivity kB. Under steady-state operating conditions, measurements reveal an outer surface temperature of Ts,o 20 C, an inner surface temperature of Ts,i 600 C, and an oven air temperature of T 800 C. The inside convection coefficient h is known to be 25 W/m2 K. What is the value of kB?

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