Heat TransferQuestion is image The spectral emissivity and spectral reflectivity of a diffuse surface are given below:1.00.20.20.11.403.0 λ (μm)1.403.0 λ (μm)i-Determine the total emissive power of the surface (in W/m²) if the surface is at 2000K.ii-Determine the absorptivity and reflectivity of the surface for radiation coming fromthe source at temperature of 1000 K.Sketch the spectral transmissivity, tWhat is the total absorptivity of the surface for the irradiation depicted below?iii-iv-50001.0 2.0 3.0 4.0 5.01 (um)

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1.0 0.2 0.2 0.1 n1 1.40 3.0 A (um) 1.40 3.0 λ (μm)

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.30P

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Question

Heat Transfer

Question is image

The spectral emissivity and spectral reflectivity of a diffuse surface are given below:
1.0
0.2
0.2
0.1
1.40
3.0 λ (μm)
1.40
3.0 λ (μm)
i-
Determine the total emissive power of the surface (in W/m²) if the surface is at 2000
K.
ii-
Determine the absorptivity and reflectivity of the surface for radiation coming from
the source at temperature of 1000 K.
Sketch the spectral transmissivity, t
What is the total absorptivity of the surface for the irradiation depicted below?
iii-
iv-
5000
1.0 2.0 3.0 4.0 5.0
1 (um)

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