Question

i. The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, kA 20 W/m K and kC50 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?

          i.  The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, kA  20 W/m  K and kC50 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?

Added by Kenneth M.

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