the Stirling Engine.
It is a heat engine that converts heat to mechanical motion in a closed system.
It essentially has two chambers containing pistons. One chamber is heated, the other 'cold'. Expanding air pushes out the first piston, turning the flywheel, which draws the expanded air into the colder chamber as it is attached to the flywheel in conjunction to the first piston. the now colder air is compressed back into the hot chamber, and the cycle repeats. Really.. really quickly!
Sounds complicated, but its really simple in operation. Just watch;) I hope you enjoy.
By Ken Killeen of Terran Sky
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