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Heat transfer from a transistor may be enhanced by

Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman ISBN: 9780470501962 111

Solution for problem 3.162 Chapter 3

Introduction to Heat Transfer | 6th Edition

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Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman

Introduction to Heat Transfer | 6th Edition

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Problem 3.162

Heat transfer from a transistor may be enhanced by inserting it in an aluminum sleeve (k 200 W/m K) having 12 integrally machined longitudinal fins on its outer surface. The transistor radius and height are r1 2.5 mm and H 4 mm, respectively, while the fins are of length L r3 r2 8 mm and uniform thickness t 0.8 mm. The thickness of the sleeve base is r2 r1 1 mm, and the contact resistance of the sleeve-transistor interface is Rt,c 0.6 103 m2 K/W. Air at T 20 C flows over the fin surface, providing an approximately uniform convection coeffficient of h 30 W/m2 K. (a) When the transistor case temperature is 80 C, what is the rate of heat transfer from the sleeve? (b) Identify all of the measures that could be taken to improve design and/or operating conditions, such that heat dissipation may be increased while still maintaining a case temperature of 80 C. In words, assess the relative merits of each measure. Choose t what you believe to be the three most promising measures, and numerically assess the effect of corresponding changes in design and/or operating conditions on thermal performance.

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Chapter 3, Problem 3.162 is Solved
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Textbook: Introduction to Heat Transfer
Edition: 6
Author: Theodore L. Bergman
ISBN: 9780470501962

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Heat transfer from a transistor may be enhanced by