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1) an oven wall consists of 3 different materials. The thickness of the material A is...

1) an oven wall consists of 3 different materials. The thickness of the material A is 20 cm and the heat transmission coefficient is 0.8 W / mK, the thickness of the material B is 10 mm and the heat transmission coefficient is 50 W / mK, and the thickness of the material C, whose heat transmission coefficient is 0.06 W / mK, is unknown. Outer surface temperature of the oven is 70 degrees, radiation emission coefficient is 0.7, oven inner surface temperature is 475 degrees and oven inner temperature is 490 degrees The heat transfer coefficient of the oven is 25W / m^2K
a) find the thickness of material C
b) What is the ambient temperature, the heat transfer coefficient of the medium and the thickness of the material c according to your acceptance? calculate.

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