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Heat Transfer
book

Heat Transfer

by Younes Shabany
December 2009
Intermediate to advanced content levelIntermediate to advanced
523 pages
18h 30m
English
CRC Press
Content preview from Heat Transfer
127
7
Fins and Heat Sinks
Consider the surface area A shown in Figure 7.1a. This can be the top surface of an
electronic package, the surface of a heat spreader that is attached to multiple elec-
tronic components of a board, or the external surface of an electronic system such as
a handheld computer or a pole-mount wireless radio unit. The total heat transfer rate
from this surface is equal to the sum of convection and radiation heat transfer rates
given by Equations 4.4 and 4.18 in Chapter 4:

QQ QhAT ThAT T
ss
=+=−+
conv radconv ∞rad
()(),,
(7.1)
or
Qh AT T
s
=−
comb
(),
(7.2)
where
hhh
comb conv rad
=+
(7.3)
is called the combined heat tra ...
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Publisher Resources

ISBN: 9781439814680