A white flying saucer made of aluminum is in outer space, and the sun is shining on thetop surface of it. It has a surface area of 1 m² per side. The absorptivity (a) for whitepaint is 0.3 to 0.5 for solar radiation (H&H Tbl. 4.1), so a good assumption would be touse the average of 0.4. The emissivity (ɛ) for white paint in the 0-38°C range is 0.9.Incoming solar radiation intensity in outer space is 1353 W/m² (p. 12 in H&H). You mayassume that there is no conductive or convective heat loss from the plate, as it is almost avacuum in outer space.Calculate the equilibrium temperature of the plate, based on the incoming solar radiationand the outgoing radiation from the plate back to outer space.

DefinitionThermal radiation:This topic investigates how electromagnetic waves transmit heat across…

Answered: Calculate the equilibrium temperature…

Calculate the equilibrium temperature of the plate, based on the incoming solar radiation and the outgoing radiation from the plate back to outer space.

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

See similar textbooks

Similar questions

Two very large parallel metal plates are separated by a small vacuum gap. Plate 1 is in contact with liquid nitrogen at T₁ = 77 K; plate 2 is at room temperature, so T₂ = 300 K (see the figure). In order to reduce the heat loss by radiation, a third plate is inserted in the middle. The absorptivity of the middle plate is a=0.10 (i.e., it absorbs 10% of radiation). Both plates 1 and 2 are considered to be blackbody, and the absorptivity equals 1.0. (The Stefan-Boltzmann constant is o-5.67×10 W/(m²K)) T₁ Tm T₂ (a) Find the equilibrium temperature of middle plate Tm. (b) Find energy flux between T₁ and T2 plates if the middle plate is not inserted. (c) Find energy flux between T₁ and T2 plates at the presence of the middle plate.
You are designing a chamber to contain the radiation emitted by nuclear decay during a fusion reaction. The left face of the (plane) chamber wall (x = 0) is exposed to the radiation and the right face of the wall (x = L) is perfectly insulated. To facilitate the fusion reaction, the left face of the wall is maintained at fixed temperature To. The radiation penetrates the wall causing uniform heat generation that varies with location inside the wall as ) = 40 (1 - 1) g(x) where qo [W/m^3 ] is a constant. Determine an expression for the temperature distribution in the wall T(x) assuming the thermal conductivity of the wall (k) is constant.
A flat-plate collector with one glass cover is placed in horizontal. The absorber plate temperature is 95 oC and its emittance is 0,12. The glass cover temperature is 45 oC, and the (glass) cover has an emittance of 0.85. The plate-cover spacing is 15 mm. The ambient and surrounding temperature are equal at 25 oC. The wind velocity is 20 km/hour. If solar radiation is 850 W/m2 , and the plate absorptivity is 95%, calculate over all heat transfer coefficient losses and the useful energy (W/m2 ). ----- s
A 1.2 m wide and 5.1 m long solar collector is mounted to a roof. Now the average surface temperature of the solar collector is measured to be 50 oC. The effective surrounding sky temperature is 8 oC. If the emissivity of the collector is 0.88, determine the rate of heat transfer from the collector to the surroundings due to radiation.
Define Emissivity of some materials at 300 K.
Question 4-83 is the one I need help with
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
You are designing a chamber to contain the radiation emitted by nuclear decay during afusion reaction. The left face of the (plane) chamber wall (? = 0) is exposed to the radiationand the right face of the wall (? = ?) is perfectly insulated. To facilitate the fusion reaction,the left face of the wall is maintained at fixed temperature ?% . The radiation penetrates thewall causing uniform heat generation that varies with location inside the wall as?̇ (?) = ?̇% _1 − ? (?( bwhere ?̇% [W/m^3 ] is a constant. Determine an expression for the temperature distributionin the wall ?(?) assuming the thermal conductivity of the wall (?) is constant.Note: You must start from the HDE, find the general solution to the differential equation,then apply the appropriate BCs to solve for ?(?). You cannot start from the general solutionin Appendix C because that solution assumes constant volumetric heat generation
At what rate does the solar wind carry kinetic energy away from the Sun? Give your result first in watts, then as a fraction of the Sun’s luminosity in photons ,L= 3.8×1026W
Consider an insulated container containing 1.62-kg ice at -17°C. Inside the container, there is a spherical object with radius 32 cm and at a certain temperature of 16370°C. Calculate the time (in hours) where all the ice has melter. Assume that sphere is a black body. Use the following: pi= 3.14 c_water = 4190 J/kgK, c_ice = 2100 J/kgK, Lf = 334,000 J/kg, o = 5.6704e (-8) W/m²K4. Final answer in TWO decimal places.
Two parallel back disks are positioned coaxially with a distance of 0.25 m apart. The lower disk is 0.2 m in diameter and the upper disk is 0.4 m in diameter. If the lower disk is heated electrically at 20 W to maintain a uniform temperature of 500 K, determine the temperature of the upper disk.
40% of incident radiant energy on the surface of thermally transparent body is reflected back, if the transmissivity of the body be 0.15 then emissivity of the surface is–