> > ... Maxwell postulated a Y-shaped pipe with a little critter sitting
> > at the fork called a daemon. the deamon's job is to watch atoms
> > coming in from the base of the pipe, and send them out the left
> > fork if they're moving slowly, and out the right fork if they're
> > moving quickly.
>
> That was my 9th grade science fair project, the "Hilsch Vortex Tube."
> Air out the left tube was -20C, right was +72C. Went all the way to
> the Nationals in '60.
Yes, but you have to feed that daemon, otherwise he won't do it. In
the vortex tube, it means pumping the air into the tube. Whether this is
more efficient or less efficient than a heat pump of the freon type,
depends upon pressures involved. But it is free of freon gas, wich is a
plus.
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