On 08/07/2010 19:30, RussellMc wrote:
>>> Does the Crookes radiometer count?
>> Not at all what I had in mind, but I guess it has a single part that
>> rotates.  It would be rather difficult to get much power from such a device
>> though.
> I wonder how efficient the conversion is or what percentage of energy
> can be transmitted to the rotor. It would be easy to drive a micro
> alternator from such a device. Or rather, to integrate the rotor and a
> custom built alternator.  Direct solar converson :-).
>
>
>               Russell
>
A rotor around a shaft, (inverted screw). Fluid rises up it ..  cools at 
top, outside of rotor is normal screw in outer casing and fluid falls 
back down the outside screw.

Magnets in the single  moving part that has a screw on inner and outer 
surface. coils in outer casing.

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