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(b) A black body in vacuum emits maximum radiation at wavelength 0.6x10° m. Estimate the : (1) Surface temperature (ii)Monochromatic emissive power (iii)Total Emissive power.

(b) A black body in vacuum emits maximum radiation at wavelength 0.6x10° m. Estimate the : (1) Surface temperature (ii)Monochromatic emissive power (iii)Total Emissive power.

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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Q4(a) Explain how the emissive power of real body is estimated. (b) A black body in vacuum emits maximum radiation at wavelength 0.6x10° m. Estimate the : (i) Surface temperature (ii)Monochromatic emissive power (iii)Total Emissive power. (c) A two layer wall is to be constructed having dimensions 2.5m (width ) by 3.5 m (height). The wall is constructed of one layer of common brick( k=0.72 W/m °C) of thickness 22 cm and one layer of cement(k=1.4 W/m °C) of thickness 6 cm. The inner surface of the wall is maintained at 25°C while the outer surface is exposed to outdoors at 11°C with a combined convection and radiation heat transfer cofficient of 20 W/m? °C. (1)Determine the rate of heat transfer through the wall. (ii)Estimate the temperature drops across the brick, cement and surface ambient air.
Transcribed Image Text:Q4(a) Explain how the emissive power of real body is estimated. (b) A black body in vacuum emits maximum radiation at wavelength 0.6x10° m. Estimate the : (i) Surface temperature (ii)Monochromatic emissive power (iii)Total Emissive power. (c) A two layer wall is to be constructed having dimensions 2.5m (width ) by 3.5 m (height). The wall is constructed of one layer of common brick( k=0.72 W/m °C) of thickness 22 cm and one layer of cement(k=1.4 W/m °C) of thickness 6 cm. The inner surface of the wall is maintained at 25°C while the outer surface is exposed to outdoors at 11°C with a combined convection and radiation heat transfer cofficient of 20 W/m? °C. (1)Determine the rate of heat transfer through the wall. (ii)Estimate the temperature drops across the brick, cement and surface ambient air.
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