Unusual/Interesting Engines/Motors

[Dormouse]

This engine was being discussed this week



However, the really interesting bit is this.

[myglaren]

[mickthemaverick]

This may raise some scepticism!!

[NewcastleFalcon]

So good its appeared in two of the previous three posts!

Neil

[mickthemaverick]

So it has, I missed the original post I'm afraid but better twice than never!!

[NewcastleFalcon]

So it has, I missed the original post I'm afraid but better twice than never!!

New audience every day Mick Not averse to a bit of repetition myself!

Neil

[mickthemaverick]

Food for thought?

There is a follow up to the above video released today:

[mickthemaverick]

Another view about the 6 stroke engine :

[Sloppysod]

Does this belong here, after all its is an interesting engine.

I think it is very interesting and shame it does give alot of power.

[MattBLancs]

Does this belong here, after all its is an interesting engine.

I think it is very interesting and shame it does give alot of power.

Definitely interesting and definitely an engine: that's a Stirling Engine. Runs in a temperature differential between two heat sinks (e.g. a hot brew and a colder room)

Think there has been some commercial applications: the domestic scale CHP (combined heat & power) setups - WhisperGen??? Units were a Stirling Engine inside, I believe

[Vic Evans]

We've got fans that sit on our wood burning stoves working on same Peltier thermo electric principle.

[Sloppysod]

We've got fans that sit on our wood burning stoves working on same Peltier thermo electric principle.

I've seen them, but i thought they somehow worked on thermal currents driving one of the fans.

[Paul-R]

I thought they were thermally driven as well.

[Hell Razor5543]

Some components have 'reversible' properties. When you pass an electrical current through a Peltier semiconductor it pumps heat from one side to the other (really strange to hold one between your finger and thumb and have your thumb get colder while your finger gets warmer). Conversely, when (provided it is fitted the correct way round) one side of the Peltier semiconductor is warmer than the other side it generates an electrical current. This property allows heat driven fans to work. Most live-aboard boat owners will have one or two such fans on their stoves, as it helps to circulate warmth without needing extra wiring.

[MattBLancs]

We've got fans that sit on our wood burning stoves working on same Peltier thermo electric principle.

So, my understanding is its two different technologies, though both are effectively "moving heat energy" between the two heat sinks:

Stirling Engine has a "displacer" piston and air inside the engine is heated (by the hot sink) is then moved adjacent to the cold sink when heat energy is rejected from the air into that sink.
So there's moving parts involved in this process and indeed a moving "fluid" too.

Whereas the peltier effect generates electrical current and it's a conventional DC motor using that energy that then spins the fan. No movement in the bit sat between the two heat sinks.