Saturday, March 2, 2013

How big is the heat flow?



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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