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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.

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
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 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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