Spectral hemispherical reflectivity distribution of an opaque surface is shown below. Surface is subjected to the spectral iradiation asshown.1.0400a 0.420010150.51015 202 (um)2 (um)Calculate the total irradiation on the surface in W/m2Calculate the irradiation absorbed by the surface in W/m25750625075003750425050003250185020001750160012001400

Total irradiation in surface, Gtotal = Area under irradiation curve Gtotal = A1+A2+A3 Gtotal…

Spectral hemispherical reflectivity distribution of an opaque surface is shown below. Surface is subjected to the spectral iradiation as shown. 1.0 400 ã 0.4 200 10 15 10 15 20 2 (um) 2 (um) Calculate the total irradiation on the surface in W/m2 Calculate the irradiation absorbed by the surface in W/m2 6250 7500 5750 3750 4250 5000 3250 001400 1600 1750 1850o 2000 5

Spectral hemispherical reflectivity distribution of an opaque surface is shown below. Surface is subjected to the spectral iradiation as shown. 1.0 400 ã 0.4 200 10 15 10 15 20 2 (um) 2 (um) Calculate the total irradiation on the surface in W/m2 Calculate the irradiation absorbed by the surface in W/m2 6250 7500 5750 3750 4250 5000 3250 001400 1600 1750 1850o 2000 5

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A furnace with an aperture of 30 mm diameter and emissive power of 4x10^5 W/m^2 is used to calibrate a heat flux gage having a sensitive area of 2x10^-5 m^2At what distance, measured along a normal from the aperture, should the gage be positioned to receive irradiation of 1000 W/m^2 ? If the gage is tilted off normal by 20^o what will be its irradiation?
= C, Wien's law is stated as follows: 2mT where C is 2898 μm.K and Am is the wavelength at which the emissive power of a black body is maximum for a given temperature T. The spectral hemispherical emissivity (s) of a surface is shown in the figure below (1Å = 10-10m). The temperature at which the total hemispherical emissivity will be highest is Ex 6000 7000 ^(Å) 5000
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2 parts ( C&D) Read and solve carefully please write clearly and box the final answer(s) label them Hint: Pay attention to numbers bolded
1) The spectral, hemispherical absorptivity of an opaque surface and the spectral irradiation at the surface are as shown. d' 1.0 G₂ (W/m².um) 500 0.2 0 0 0 2 4 6 8 10 12 14 16 0 2 4 6 8 10 12 14 16 λ(μm) λ(μm) a) How does the spectral, hemispherical reflectivity vary with wavelength? b) What is the total, hemispherical absorptivity of the surface? c) If the surface is initially at 500 K and has a total, hemispherical emissivity of 0.8, how will its temperature change upon exposure to the irradiation?
Wien's law is stated as follows: AmT = C, where C is 2898 μmK and Am is the wavelength at which the emissive power of a black body is maximum for a given temperature T. The spectral hemispherical emissivity (Ex) of a surface is shown in the figure below (1Å= 10-¹0m). The temperature at which the total hemispherical emissivity will be highest is K (round off to the nearest integer). Ext n 5000 6000 7000 (A)
3. A star has a surface temperature of 5,500K. Determine the radiative heat transfer received by planet Z in Petawatts with diameter of 2100 km, temperature of surface of 300K and mean absorptivity of 0.8. Radiative energy loss due to radiation dispersion on outer space is 99%.
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An opaque surface has the spectral, hemispherical reflectivity distribution as shown below. The surface receives the spectral irradiation shown below. A. Determine the total irradiation on the surfaceB. Determine the radiant flux that is absorbed by the surface
6.4 Two large diffuse parallel plates are maintained at temperatures T₁ = 1400 K and T₂ = 700 K. The plates are made from the same metal, and their spectral emissivities as a function of wavelength, &, are approximated as shown by two constant values joined by a linear decrease with wavelength. Compute the net radiant energy flux being transferred from plate 1 to plate 2. What is the energy flux if both plates are assumed gray with an approximate average emissiv- ity of 0.5 applied over the entire spectral range? 91 T₁ = 1400 K, Ex T₂ = 700 K, EX 92-91 0.85 Ex 0.15 0 Answer: q₁106,850 W/m²; 91.gray = 68,070 W/m². 2 λ (μm) 7