Stirlingengineforum.com

Internal energy remains the same because the heat input is immediately converted to work output, 100% so there is no added "heat"/energy left over to increase the "internal energy". That is only true in reference to zero Kelvin and Zero pressure. We are talking, so far about exp...

... I'd really rather use math logic and experimentation. ... Why don't you then. Try the ideal gas law for starters. If you expand a gas within a sealed Stirling engine isothermally, the temperature does not change, so the internal energy remains the same. The number of moles of gas is the same, s...

.... Or the 80% energy stored in the atmospheric "buffer" outside the engine compressing the working fluid on the return stroke is the same energy being expelled from the working fluid from inside the engine. Please leave 'buffer' and atmospheric pressure out of this discussion. I've alre...

The more heat converted to work on expansion, the LESS heat remaining in the working fluid to necessitate "back work" to compress the gas, which would only be hot and expanded due to supplied heat (heat supplied to and entering the working fluid) that had NOT been converted to work. Heat ...

What if you convert 100% of the heat on expansion, and the theoretical Carnot limit is 20%? Would you have 80% to "make up"? I don't know what are saying? If you manage to get an engine to convert 100% of the input heat into work energy during the expansion, do not confuse this with attem...

Or the 80% energy stored in the atmospheric "buffer" outside the engine compressing the working fluid on the return stroke is the same energy being expelled from the working fluid from inside the engine. Correct via energy vs "heat" buzz. Maybe you could expand on that little bl...

What if you convert 100% of the heat on expansion, and the theoretical Carnot limit is 20%? Would you have 80% to "make up"? I don't know what are saying? If you manage to get an engine to convert 100% of the input heat into work energy during the expansion, do not confuse this with attem...

What if you convert 100% of the heat on expansion, and the theoretical Carnot limit is 20%? Would you have 80% to "make up"? I don't know what are saying? If you manage to get an engine to convert 100% of the input heat into work energy during the expansion, do not confuse this with attem...

Waldschrat wrote: ↑Tue Apr 09, 2024 3:06 am seramis? instead of rice

That would be worth a try if it hasn't been tried already. Many different things have been found to work so far that I know of. Glass beads, copper BB's, aquarium gravel... Not sure what all else.

.... The second law of thermodynamics only applies to full cycles. Single strokes can be more efficient or less, often way less. Especially for the compression stroke. ... Well, "can be more efficient" is good enough I think. What the "Carnot Limit" claims is a hard limit impose...

The theory or claim I keep hearing and reading is that it is not a thermodynamic process where heat cannot be transformed into work 100% but a CYCLICAL process. It IS possible to transform all the heat into work during expansion but heat has to be rejected during compression. Is this correct, or doe...

Totally different linkages for the Essex ... Maybe off topic here, but since the video of the Essex was posted here, it provides a good view of the "negative dead space" as both power piston and displacer piston move to the left together during heating/compression. I slowed down the video...

Common sense would seem to dictate that if a heat engine is running there is at least heat>0 going in and work(mechanical motion or a running engine)>0 On the other hand, heat is a form of light is it not? Or at a minimum can take the form of infrared light, and light has some unfathomable propertie...

Been working on trying to get the rice engine to turn a flywheel. Mostly just to see if it's possible. I recall someone mentioning on the other "rice engine" thread that they were going to try it but never reported back. Anyway, I think I'm done and ready to give it a go as soon as some ep...

... Unfortunately the engine quickly heat soaks with no active cooling. I'd like to rig up a water cooled cold end. I don't want to do any permanent modifications to this engine. It really is beautifully made and a throw back to how things used to be. ... I think the single shared cylinder contribu...