A circular ice rink 60 m in diameter is enclosed by a hemispherical dome 100 m in diameter. The0°C ice has emissivity of arink = 0.9, and the 20°C dome has emissivity of Edome = 0.3. The sidering seating area is a blackbody at 20°C. All surfaces are opaque, diffuse, and gray. Determine:A) The radiosity for the ice rink (Jrink), and the dome (Jdome).B) Net radiation heat transfer (grink-dome in W) between the ice rink and dome.Ddome 100 mTdome = 20°CDrink - 60 mTrink=0°CTseating = 20°C

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Answered: A circular ice rink 60 m in diameter is…

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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Two 75 cm parallel disks are separated by 40 cm and are aligned directly on top of each other. Both disks are black surfaces with temperatures of 450 K. The backs of the disks are insulated and the surroundings may be treated as a black body at 300 K. Determine the net radiation heat transfer from the disks to the environment.
8. A black body has an effective surface temperature of 1000°C. Determine: (a) The total radiation energy (W/m?) that can be emitted by the black body (b) Determine total radiation energy (W/m?) that can be emitted by the black body within the 1-5 um wavelength range (c) The spectral blackbody emissive power at a wavelength of 2.5 um. (d) At what wavelength will this body have the maximum spectral blackbody emissive power.
Calculate the net heat flux per unit area and by radiation between two infinitely large parallel plates with a very small space between them. They both behave as black bodies and are kept at 1000K and 500K, respectively.
A 0.6m diameter sphere is suspended in an enclosure. The ball is kept at aconstant 200oC, while the enclosure is kept at 25oC. a) If the enclosure is opaque, how much radiation is emitted by the ball into the enclosure? b) If the enclosure is not opaque, it does not form a black body. Let’s say the enclosure has a transmissivity of 0.6 and a reflectivity of 0.2. How much thermal radiation is absorbed by the enclosure?
= 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
A furnace is located next to a dense array of cryogenic fluid piping. The ice-covered piping approximates a plane surface with an average temperature of Tp = 0°C and a total, hemispherical emissivity of εp = 0.56. That is, the piping can be replaced by a flat surface with the given properties. The furnace wall has a temperature of Tf = 247°C and a total, hemispherical emissivity of εf = 0.86. To minimize the heat loading on the regirgeration equipment and piping, a reflective aluminum radiation shield with a total, hemispherical emissivity of εs = 0.13 on each of its sides is installed between the pipiing and the furnace wall as shown. Assume that all surfaces are diffuse and gray and treat the problem as one-dimensional (surfaces form infinite parallel plates). What is the heat load on on the refrigeration unit? That is, what is the net radiative power at the surface which approximates the dense array of ice-cold piping, qrad,p in Watts?
determine the view factor, and the net heat transfer by radiation between two gray surfaces, A (εA= 0.88) and B (εB= 0.65) at temperatures 450°C and 50°C, respectively if d. surfaces A and B concentric cylindrical tubes with diameters of 400 mm and 200 mm, respectively e. both surfaces are discs of diameter 3 m one exactly above the other, 1 m apart
An opaque surface at 1000 K if its spectral emissivity is = 0.4, 0.7, and 0.3 for 0 < < 2 µm, 2μm < 6 μm, and 6um
A furnace is located next to a dense array of cryogenic fluid piping. The ice-covered piping approximates a plane surface with an average temperature of Tp = 0°C and a total, hemispherical emissivity of εp = 0.53. That is, the piping can be replaced by a flat surface with the given properties. The furnace wall has a temperature of Tf = 206°C and a total, hemispherical emissivity of εf = 0.83. To minimize the heat loading on the regirgeration equipment and piping, a reflective aluminum radiation shield with a total, hemispherical emissivity of εs = 0.14 on each of its sides is installed between the pipiing and the furnace wall as shown. Assume that all surfaces are diffuse and gray and treat the problem as one-dimensional (surfaces form infinite parallel plates). What is the heat load on on the refrigeration unit? That is, what is the net radiative power at the surface which approximates the dense array of ice-cold piping, qrad,p in Watts?
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)
Calculate the total radiation of a vertical surface at 2:30 pm in Bandar Baru Bangi [please use:(BBB) Longitude = 101° 48’ E, Latitude =2 ° 56’ N ) facing N60 °W on 21st Dec. In front of the surface is the swimming pool. Assume : reflected swimming pool factor, r=0.30 and Gth= 500 Btu/hr.ft2
Calculate the absorbed irradiation by the surface in W/m2

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