Problem 2: A black body of total area 0.045 m² is completely enclosed in a space bounded by 5 cm thick walls. The walls have a surface area 0.5 m2 and thermal conductivity 1.07 W/m-deg. If the inner surface of the enveloping wall is to be maintained at 215°C and the outer wall surface is at 30°C, calculate the temperature of the black body. Neglect the difference between inner and outer surfaces areas of enveloping material. Note: Under steady condition, the heat conducted through the wall must eaqual to the net radiation loss from the black body. Ans. 955.9 K

Problem 2: A black body of total area 0.045 m² is completely enclosed in a space bounded by 5 cm thick walls. The walls have a surface area 0.5 m2 and thermal conductivity 1.07 W/m-deg. If the inner surface of the enveloping wall is to be maintained at 215°C and the outer wall surface is at 30°C, calculate the temperature of the black body. Neglect the difference between inner and outer surfaces areas of enveloping material. Note: Under steady condition, the heat conducted through the wall must eaqual to the net radiation loss from the black body. Ans. 955.9 K

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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Concept explainers

Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

Question

Problem 2: A black body of total area 0.045 m² is completely enclosed in a space bounded by 5 cm
thick walls. The walls have a surface area 0.5 m² and thermal conductivity 1.07 W/m-deg. If the inner
surface of the enveloping wall is to be maintained at 215°C and the outer wall surface is at 30°C,
calculate the temperature of the black body. Neglect the difference between inner and outer surfaces
areas of enveloping material. Note: Under steady condition, the heat conducted through the wall must
eaqual to the net radiation loss from the black body.
Ans. 955.9 K

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