A 10 cm x 25 cm printed circuit board whose components are not allowed to come into direct contact with air for reliability reasons is to be cooled by passing cool air through a 25 cm long channel of rectangular cross section 2.5 mm x 90 mm drilled into the board. The heat generated by the electronic components is conducted across the thin layer of the board to the channel, where it is removed by air that enters the channel at 20 °C. The heat flux at the top surface of the channel can be considered to be uniform. If the velocity of the air at the inlet of the channel is not to exceed 5 m/s and the surface temperature of the channel is to remain under 55 °C, determine the maximum total power of the electronic components that can safely be mounted on this circuit board.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A 10 cm x 25 cm printed circuit board whose
components are not allowed to come into direct
contact with air for reliability reasons is to be
cooled by passing cool air through a 25 cm long
channel of rectangular cross section 2.5 mm x 90
mm drilled into the board. The heat generated
by the electronic components is conducted
across the thin layer of the board to the channel,
where it is removed by air that enters the
channel at 20 °C. The heat flux at the top surface
of the channel can be considered to be uniform.
If the velocity of the air at the inlet of the channel
is not to exceed 5 m/s and the surface
temperature of the channel is to remain under 55
°C, determine the maximum total power of the
electronic components that can safely be
mounted on this circuit board.
Air
20 °C
Electronic
Air Channel
components
2.5 mm x 90 mm
Use iteration to find the temperature/heat
transfer/Q
Transcribed Image Text:A 10 cm x 25 cm printed circuit board whose components are not allowed to come into direct contact with air for reliability reasons is to be cooled by passing cool air through a 25 cm long channel of rectangular cross section 2.5 mm x 90 mm drilled into the board. The heat generated by the electronic components is conducted across the thin layer of the board to the channel, where it is removed by air that enters the channel at 20 °C. The heat flux at the top surface of the channel can be considered to be uniform. If the velocity of the air at the inlet of the channel is not to exceed 5 m/s and the surface temperature of the channel is to remain under 55 °C, determine the maximum total power of the electronic components that can safely be mounted on this circuit board. Air 20 °C Electronic Air Channel components 2.5 mm x 90 mm Use iteration to find the temperature/heat transfer/Q
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