(b) Consider a sealed 20-cm-high electronic box in Figure 1 whose base dimensions are 50 cm x 50 cm placed in a vacuum chamber. The emissivity of the outer surface of the box is 0.95. If the electronic components in the box dissipate a total of 120 W of power and the outer surface temperature of the box is not to exceed 55°C, determine the temperature at which the surrounding surfaces must be kept if this box is to be cooled by radiation alone. Assume the heat transfer from the bottom surface of the box to the stand to be negligible. 50 cm 120 W 8 = 0.95 T₂ = 55°C 20 cm Stand 50 cm Figure 1 Electronic box
(b) Consider a sealed 20-cm-high electronic box in Figure 1 whose base dimensions are 50 cm x 50 cm placed in a vacuum chamber. The emissivity of the outer surface of the box is 0.95. If the electronic components in the box dissipate a total of 120 W of power and the outer surface temperature of the box is not to exceed 55°C, determine the temperature at which the surrounding surfaces must be kept if this box is to be cooled by radiation alone. Assume the heat transfer from the bottom surface of the box to the stand to be negligible. 50 cm 120 W 8 = 0.95 T₂ = 55°C 20 cm Stand 50 cm Figure 1 Electronic box
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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Transcribed Image Text:(b)
Consider a sealed 20-cm-high electronic box in Figure 1 whose base dimensions are 50
cm x 50 cm placed in a vacuum chamber. The emissivity of the outer surface of the box
is 0.95. If the electronic components in the box dissipate a total of 120 W of power and
the outer surface temperature of the box is not to exceed 55°C, determine the temperature
at which the surrounding surfaces must be kept if this box is to be cooled by radiation
alone. Assume the heat transfer from the bottom surface of the box to the stand to be
negligible.
50 cm
120 W
€ = 0.95
T₁ = 55°C
20 cm
Stand
50 cm.
Figure 1
Electronic
box
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