Tom Murphy has done a couple of blog posts on this exact thing: http://physics.ucsd.edu/do-the-math/2012/04/heat-those-feet/ http://physics.ucsd.edu/do-the-math

Tom Murphy has done a couple of blog posts on this exact thing: http://physics.ucsd.edu/do-the-math/2012/04/heat-those-feet/ http://physics.ucsd.edu/do-the-math/2012/04/heat-those-feet/ http://physics.ucsd.edu/do-the-math/2012/05/burning-desire-for-efficiency/ http://physics.ucsd.edu/do-the-math/2012/05/burning-desire-f...