A 50-cm x 50-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection and radiation by mounting it on a horizontal surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the emissivity of the chip surfaces is 0.7. Assume the heat transfer from the back side of the circuit board to be negligible, and the temperature of the surrounding surfaces to be the same as the air temperature of the room. Evaluate air properties at a film temperature of 30°C and 1 atm pressure. Given: The properties of air at 1 atm and the anticipated film temperature of 30°C. k = 0.02588 W/m.°C, v=1.608 x 10-5 m²/s, Pr = 0.7282, 3= 0.0033 K-1 Assuming the circuit board to be positioned horizontally with chips facing up, determine the surface temperature of the chips. The surface temperature of the chips is 36.2 * °C.
A 50-cm x 50-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection and radiation by mounting it on a horizontal surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the emissivity of the chip surfaces is 0.7. Assume the heat transfer from the back side of the circuit board to be negligible, and the temperature of the surrounding surfaces to be the same as the air temperature of the room. Evaluate air properties at a film temperature of 30°C and 1 atm pressure. Given: The properties of air at 1 atm and the anticipated film temperature of 30°C. k = 0.02588 W/m.°C, v=1.608 x 10-5 m²/s, Pr = 0.7282, 3= 0.0033 K-1 Assuming the circuit board to be positioned horizontally with chips facing up, determine the surface temperature of the chips. The surface temperature of the chips is 36.2 * °C.
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 50-cm x 50-cm circuit board that contains 121 square chips on one side
is to be cooled by combined natural convection and radiation by mounting
it on a horizontal surface in a room at 25°C. Each chip dissipates 0.18 W of
power, and the emissivity of the chip surfaces is 0.7. Assume the heat
transfer from the back side of the circuit board to be negligible, and the
temperature of the surrounding surfaces to be the same as the air
temperature of the room. Evaluate air properties at a film temperature of
30°C and 1 atm pressure.
Given: The properties of air at 1 atm and the anticipated film temperature
of 30°C.
k = 0.02588 W/m.°C,
v=1.608 x 10-5 m²/s,
Pr = 0.7282,
B = 0.0033 K-1
Assuming the circuit board to be positioned horizontally with chips facing up, determine the
surface temperature of the chips.
The surface temperature of the chips is 36.2 °C.
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Transcribed Image Text:Required information
A 50-cm x 50-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection
and radiation by mounting it on a horizontal surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the
emissivity of the chip surfaces is 0.7. Assume the heat transfer from the back side of the circuit board to be negligible, and
the temperature of the surrounding surfaces to be the same as the air temperature of the room. Evaluate air properties at
a film temperature of 30°C and 1 atm pressure.
Given: The properties of air at 1 atm and the anticipated film temperature of 30°C.
k = 0.02588 W/m.°C,
v=1.608 x 10-5 m²/s.
Pr = 0.7282,
3= 0.0033 K-1
Assuming the circuit board to be positioned horizontally with chips facing down, determine the surface temperature of the chips.
The surface temperature of the chips is
°C.
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