Answered: For safety reasons, parts can be…

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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Question

For safety reasons, parts can be directly blown by air. with dimensions of 15 cmx20 cm, which are not allowed to contact printed circuit board, 20 cm long 0.2 opened inside Cold air from a rectangular hole of cmx14 cm will be cooled. from electronic parts The heat generated is transmitted from the thin layer of the card to the duct, where it is combined with the air entering the duct at a temperature of 15 °C. is removed. The heat flux on the upper surface of the channel can be considered uniform and The heat transfer from the surfaces can be neglected. If the velocity of the air in the duct does not exceed (590) m/min and the surface temperature of the duct is constant at 50 °C, this circuit board can be safely placed on it. Calculate the maximum total power of the electronic parts to be placed.

Electronic components,
50°C
Air
L= 20 cm
15°C
Air channel
4 m/s
0.2 cm x 14 cm

Expert Solution

Step 1

$Given : Length of PCB, L = 20 cm = 0.2 m Width of PCB, w = 15 cm = 0.15 m Cross sectional area of channel, A_{C} = (0.2 cm \times 14 cm) = (0.002 m \times 0.14 m) Temperature of inlet air, T_{i} = 15^{ο} C Velocity of inlet air, V = 4 \frac{m}{s} Surface tempearure of channel, T_{s} = 50^{ο} C$

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