Consider a microprocessor dissipating 50 W with dimensions 2-cm 2-cm square and 0.5-cm high (see figure).

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Consider a microprocessor dissipating 50 W with dimensions 2-cm × 2-cm square and 0.5-cm high (see figure). In order to cool the microprocessor, it is necessary to mount it to a device called a heat sink, which serves two purposes. First, it distributes the heat from the relatively small microprocessor to a larger area; second, it provides extended heat transfer area in the form of fins. A small fan then is used to provide forced-air cooling. The main constraints to the design of a heat sink are cost and size. For laptop computers, fan power is also an important consideration. Develop a heat-sink design that maintains the microprocessor at 90°C or less and suggest ways to optimize the cooling system.

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Principles Of Heat Transfer

ISBN: 9781305387102

8th Edition

Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn

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