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On their entrance to your kitchen, all molecules have their temperature measured, and depending on their kinetic energy are assigned either to the fridge or the cooker. Middling molecules are excluded, and passed directly into the waste disposal unit.
Thus efficient use is made of all molecules,
no matter what their kinetic energy: active ones are used to heat, and sluggish ones to cool. This works because in any gas the molecules have a range of kinetic energies, and thus the individual molecules have a wide range of temperatures.
[I'm hoping for some quantum mechanical effect to toggle on and off the "R" in the final word of the title.]
Maxwell's Demon game
Can YOU violate the 2nd law of thermodynamics? [pottedstu, Dec 12 2001, last modified Oct 21 2004]
What is a Maxwellian Demon?
Maxwell's Demon explained. And they actually exist. [pottedstu, Dec 12 2001, last modified Oct 21 2004]
||Wasn't the point of Maxwell's Demon that it required a Demon to make it work - i.e. it doesn't work ?
||You would have be careful about getting pins too near such a system because of all the angels dancing on the pinheads ...
||how many angels can you get on a pinhead?
||Look up a Hilsch (spelling may be off) vortex tube.
All you need is an inexhaustible supply of compressed air and Maxwell's demon is on the job. However, free & limitless compressed air is kinda hard to come by.