12.37 Consider the metallic surface of Example 12.7. Addi- tional measurements of the spectral, hemispherical emissivity yield a spectral distribution which may be approximated as follows: 0.4 * 0.2 2 4 a (um) (a) Determine corresponding values of the total, hemi- spherical emissivity ɛ and the total emissive power E at 2000 K. Ez (2.)

12.37 Consider the metallic surface of Example 12.7. Addi- tional measurements of the spectral, hemispherical emissivity yield a spectral distribution which may be approximated as follows: 0.4 * 0.2 2 4 a (um) (a) Determine corresponding values of the total, hemi- spherical emissivity ɛ and the total emissive power E at 2000 K. Ez (2.)

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 11.9P

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11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
11.41 Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
A flame from a match may be approximated as a blackbody at the effective surface temperature of 1700 K, while moonlight may be approximated as a blackbody at the effective surface temperature of 4000 K, respectively. Determine the peak spectral blackbody emissive power for both lighting sources (match flame and moonlight).
A flame from a match may be approximated as a blackbody at the effective surface temperature of 1830 K, while moonlight may be approximated as a blackbody at the effective surface temperature of 4130 K, respectively. Determine the peak spectral blackbody emissive power for both lighting sources (match flame and moonlight). Given: C1 = 3.74177 × 108 W·μm4/m2 C2 = 1.43878 × 104 μm·K (λT)maxpower = 2897.8 µm·K For a match flame (T = 1830 K), the peak spectral blackbody emissive power, Ebλmax (1830) = _____ × 105 W/m2·µm. For a moonlight (T = 4130 K), the peak spectral blackbody emissive power, Ebλmax (4130) = ______ × 107 W/m2·µm.