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A wall made of concrete 0.305 m thick is insulated on the rear side. The wall at a uniform temperature of l0°C (283.2 K) is exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient is 28.4 W/m2-K, the thermal diffusivity is 1.74 x 10–3 m2/h, and the thermal conductivity is 0.935 W/m-K. a. Calculate the time for the temperature at the insulated face to reach 232°C (505.2 K). b. Calculate the temperature at a point 0.152m below the surface at this same time

A wall made of concrete 0.305 m thick is insulated on the rear side. The wall at a uniform temperature of l0°C (283.2 K) is exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient is 28.4 W/m2-K, the thermal diffusivity is 1.74 x 10–3 m2/h, and the thermal conductivity is 0.935 W/m-K. a. Calculate the time for the temperature at the insulated face to reach 232°C (505.2 K). b. Calculate the temperature at a point 0.152m below the surface at this same time

Elements Of Electromagnetics
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 wall made of concrete 0.305 m thick is insulated on the rear side. The wall at a uniform temperature of l0°C (283.2 K) is exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient is 28.4 W/m2-K, the thermal diffusivity is 1.74 x 10–3
m2/h, and the thermal conductivity is 0.935 W/m-K.

a. Calculate the time for the temperature at the insulated face to reach 232°C (505.2 K).
b. Calculate the temperature at a point 0.152m below the surface at this same time

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