o surfaces, A and B has a temperature of 4500 K and different spectral ssivity as shown in Figure 3.1. By assuming Stefan Boltzmann constant is 7x 10* W/m-K, determine: the average emissivity for each surface, emissive power for each surface, wavelength of surface A at which spectral emissive power will be a maximum, and which surface is more suitable as a solar absorber? Justify your answer.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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(a)
Two surfaces, A and B has a temperature of 4500 K and different spectral
emissivity as shown in Figure 3.1. By assuming Stefan Boltzmann constant is
5.67 x 10* W/m²-K', determine:
i.
the average emissivity for each surface,
emissive power for each surface,
iii.
wavelength of surface A at which spectral emissive power will be a
maximum, and
iv.
which surface is more suitable as a solar absorber? Justify your answer.
0.7
0.6
0.2
0.2
0.1
0.1
A. um
A. um
(a)
(b)
Figure 3.1 Variation of spectral; (a) Surface A, (b) Surface B
Transcribed Image Text:(a) Two surfaces, A and B has a temperature of 4500 K and different spectral emissivity as shown in Figure 3.1. By assuming Stefan Boltzmann constant is 5.67 x 10* W/m²-K', determine: i. the average emissivity for each surface, emissive power for each surface, iii. wavelength of surface A at which spectral emissive power will be a maximum, and iv. which surface is more suitable as a solar absorber? Justify your answer. 0.7 0.6 0.2 0.2 0.1 0.1 A. um A. um (a) (b) Figure 3.1 Variation of spectral; (a) Surface A, (b) Surface B
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