For safety reasons, air 15cmx20 cm in contact not allowed circuit board, cold air through a 20cm long 0.2cmx14cm rectangular hole drilled inside will be cooled. From electronic parts mosque heat is transmitted from the thin layer of the card to the channel, where the air entering the channel at 15 ° C is removed. The heat flux on the upper surface of the channel can be regarded as uniform and other Heat transfer from surfaces can be neglected. If the velocity of the air inside the duct does not exceed 600m / min and the surface surface of the duct is fixed at 50 ° C, write on this circuit board. Total calculations of electronic parts to be placed.
For safety reasons, air 15cmx20 cm in contact not allowed circuit board, cold air through a 20cm long 0.2cmx14cm rectangular hole drilled inside will be cooled. From electronic parts mosque heat is transmitted from the thin layer of the card to the channel, where the air entering the channel at 15 ° C is removed. The heat flux on the upper surface of the channel can be regarded as uniform and other Heat transfer from surfaces can be neglected. If the velocity of the air inside the duct does not exceed 600m / min and the surface surface of the duct is fixed at 50 ° C, write on this circuit board. Total calculations of electronic parts to be placed.
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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For safety reasons, air 15cmx20 cm in contact not allowed circuit board, cold air through a 20cm long 0.2cmx14cm rectangular hole drilled inside will be cooled. From electronic parts mosque heat is transmitted from the thin layer of the card to the channel, where the air entering the channel at 15 ° C is removed. The heat flux on the upper surface of the channel can be regarded as uniform and other Heat transfer from surfaces can be neglected. If the velocity of the air inside the duct does not exceed 600m / min and the surface surface of the duct is fixed at 50 ° C, write on this circuit board. Total calculations of electronic parts to be placed.
Transcribed Image Text:Electronic components,
50°C
Air
L= 20 cm
15°C
Air channel
4 m/s
0.2 cm x 14 cm
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