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Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.10P

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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

The spectral emissivity function of an opaque surface at 800 K is approximated as: Determine the average emissivity of the surface and its emissive power.

The spectral emissivity function of an
opaque surface at 800 K is approximated as:
1.0
0.8
0.3
0.1
7.
A. um
Determine the average emissivity of the
surface and its emissive power.
Select one:
a. ɛ = 0.621, E = 12 100 W/m2
%3D
b. ɛ = 0.721, E = 12 100 W/m2
%3D
C. E = 0.521, E = 12 100 W/m2
d. ɛ = 0.521, E = 15 100 W/m2
%3D

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