Answered: A furnace wall is made up of three…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A furnace wall is made up of three layer of thickness 200 mm, 100 mm, and 125
mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The
inside is exposed to gases at 1200°C with a convection coefficient of 25 W/m2
-K
and the inside surface temperature is at 1000°C, the outside air temperature is at
30°C with convection coefficient of 12 W/m2
-K. Calculate:
a. the unknown thermal conductivity;

2. A furnace wall is made up of three layer of thickness 200 mm, 100 mm, and 125
mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The
inside is exposed to gases at 1200°C with a convection coefficient of 25 W/m²-K
and the inside surface temperature is at 1000°C, the outside air temperature is at
30°C with convection coefficient of 12 W/m²-K. Calculate:
a. the unknown thermal conductivity;
b. the outside surface temperature and mid-plane temperatures in °F.

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