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 600 oC, and an oven air temperatu

Elements Of Electromagnetics
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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 600 oC, and an oven air temperature of 800 oC. The inside convection
coefficient h is known to be 25 W/m2 – K. total rate of heat transfer = 550 W/m2.What is the value of kB?

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