a) What fraction of the radiation is from 0 to 4 micrometers? What would the fraction be from 4 to 6 micrometers?b) What is the emissivity for this surface?c) What is the emissive power of this surface, in W/m2? A diffuse surface is characterized by the spectral hemispherical emissivity distribution shown in the figure below, where & = 0.75,&2 = 0.10, and 3 = 0.8. For a surface temperature of T, = 300 K, what is the emissive power for the surface?00&2&4 6λ (μm)E3810

Given: The surface temperature Ts=300 K ε1=0.75, ε2=0.1, ε3=0.8

a) What fraction of the radiation is from 0 to 4 micrometers? What would the fraction be from 4 to 6 micrometers? b) What is the emissivity for this surface? c) What is the emissive power of this surface, in W/m2?

a) What fraction of the radiation is from 0 to 4 micrometers? What would the fraction be from 4 to 6 micrometers? b) What is the emissivity for this surface? c) What is the emissive power of this surface, in W/m2?

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 11.3P: Determine the total average hemispherical emissivity and the emissive power of a surface that has a...

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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

a) What fraction of the radiation is from 0 to 4 micrometers? What would the fraction be from 4 to 6 micrometers?

b) What is the emissivity for this surface?

c) What is the emissive power of this surface, in W/m²?

A diffuse surface is characterized by the spectral hemispherical emissivity distribution shown in the figure below, where & = 0.75,
&2 = 0.10, and 3 = 0.8. For a surface temperature of T, = 300 K, what is the emissive power for the surface?
0
0
&
2
&
4 6
λ (μm)
E3
8
10

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