spring 2012 exam1 solutions annotated

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 Problem 1 METHOD 1: Without the heat sink, you can determine the heat rate. 2 1 hD T T q  s     2 03 . 0 200 1 20 60 q  2 . 7 q  W With heat sink: In this method, we analyze the heat sink as an array of individual ns with heat rates in parallel with each other and in parallel with the convection ux through the exposed base region (i.e. the portion of the base that is not covered by ns). See method 2 f or a simpler treatment that uses the overall thermal resistance of the n array.

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