Consider a 26-cm x 31-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back surface of the board is negligible. Assume that the circuit board dissipates 8 W of power in steady operation. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. Evaluate air properties at a film temperature of 32.5°C and 1 atm pressure.
Consider a 26-cm x 31-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back surface of the board is negligible. Assume that the circuit board dissipates 8 W of power in steady operation. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. Evaluate air properties at a film temperature of 32.5°C and 1 atm pressure.
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:Consider a 26-cm x 31-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a
room at 20°C. The heat loss from the back surface of the board is negligible. Assume that the circuit board dissipates 8 W
of power in steady operation. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding
surfaces to be at the same temperature as the air in the room. Evaluate air properties at a film temperature of 32.5°C and 1
atm pressure.
Given: The properties of air at 1 atm and 32.5°C.
k = 0.02067W/m.°C
v= 1.631 x 10-5 m2/s
Pr = 0.7275,
B = 0.003273 K-1
Transcribed Image Text:Given: The properties of air at 1 atm and 32.5°C.
k = 0.02067W/m.°C
v = 1.631 x 10-5 m2/s
Pr = 0.7275,
B = 0.003273 K-1
Determine the average temperature of the hot surface of the board, assuming the board is horizontal with hot surface facing up.
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