Sometimes it is useful to have a ballpark idea of the size
of a heat flow before even starting a more detailed heat transfer
analysis. It is also kind of fun to have
a rough idea of the magnitude of different heat flows. To those ends, we present this figure:
The magnitude of the approximate heat flux (total rate of
heat flow per unit area) is shown for a variety of different situations. Where a range of typical values is to be
shown, the bar is a lighter green over the range.
Notice that the horizontal scale is logarithmic. We are comparing heat flows of such vastly
different magnitudes that we needed a log scale to make them all visible on the
same graph. Unfortunately, this tends to
make the differences look a little understated.
For example, notice that the
difference between “typical CPU heat flux” and “anticipated future CPU heat
fluxes” is a factor of 10!
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