30 Nov '13, 12am
"Tuna can and some other trash turned into a Stirling engine" must make one of these
There’s no air released, the Stirling cycle reuses the same volume of working gas for all phases. The displacer rises, air in the cilinder is moved to the hot side, the heat makes the air expand, the increased pressure pushes on the piston, which moves the cam forward. this makes the displacer fall, displacing air to the cold side. The air cools down, creating a vacuum that pulls on the piston, moving the cam forward… and the cycle repeats. An interesting feature is that you can use a stirling engine “in reverse”, to move heat from the cold to the hot side, by turning its axle. and the direction of rotation will determine which side is the hot one and which is the cold one. Stirling coolers are usually sealed and use Helium as working gas to achieve lower temperatures.