Answered: A w=40 mm square computer CPU is air…

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

A w=40 mm square computer CPU is air cooled with fans shown in the figure below. The
surrounding air in the case has convection coefficient h = 100 W/m²⋅K and temperature T_∞ = 30^oC. If the aluminum heat sink (k = 230 W/m⋅K) on your computer has N = 20 exposed equally-spaced rectangular fins of thickness t =1 mm and length L_f = 15 mm:

a) Calculate the overall efficiency η_o of the fins
b) Given that the CPU is generating Q_CPU = 90 W, determine the temperature of the CPU, assuming the CPU is a uniform temperature and well-insulated on its sides. Ignore thermal contact resistance and fin array base resistance

4
h= 100 W/m²K.
T=30°C
CPU
W
N
k = 230 W/m - K
W

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