Stirlingengineforum.com

I'm speculating that, even though the pressure would tend to equalize, any small motion of the ring would change that stability because that motion would be caused by converting some amount of the heat to mechanical force, and the motion itself would amplify the instability if it goes too far.

Here is an image without the debugger selection overlay.

I've been thinking about a rotary Stirling engine with a design that is very similar in having a synchronized rotating central structure, but quite different in that I am trying to do away with most of the moving parts, all the cylinders, pistons, and displacers. Basically, there is only a moving ri...

Hey guys. (I've been reading all new posts the past few months... Still very interested in all this.) Regarding the idea of making timing adjustments on a running engine, that would be a great way to enable doing many more experiments. But even if you have to restart the engine after a quick adjustm...

I did read the air-cycle previously, and again. Thanks for bringing it up. Each time I reread these docs I get more out of them. Still learning lots. Seems a cold storage unit would be as useful as a thermal storage unit, depending on individual needs. Could sand be used for both? So it sounds like ...

Heating up a thermal storage unit with direct heat, if it is hot enough to do the job, makes a lot more sense than heating with electrical resistance, unless you are going to otherwise throw away the electricity. This is simply because an electric powered heat pump system can move several times more...

I should have said that the current belief is the efficiency number is a fraction (or percentage) of the energy that is transferred into the hot side of the engine, not a fraction of all the energy that is available to be transferred through. And the belief is that only that fraction of the energy t...

Maybe the efficiency, based on the heat difference, is a rate of transfer of energy from the hot side to the cold side, or to work. And with lower temperature on the hot side, there is less energy that can be transferred, so even if two engines have the same efficiency, the one running with less ene...

I just tripped over info about Sunamp, and their "heat battery" which is a phase change material thermal storage unit. https://www.youtube.com/watch?v=OETqG5PCz_o I talked with their New York office, and it appears I could get a 4 ton system for about $3500. The heat input is either electr...

Lol, not sure how I posted twice, but that's better than losing a post. Can't figure out how to delete one. In terms of product ideas, and related to the subject of the thread, this machine converts air pressure or the opposite, a vacuum, in the context of a heat difference, into mechanical force, a...

I watched several more of their videos, and this one is perhaps the best one to explain what he is doing.

https://youtu.be/ysCV3dbzzWE

Seems like he's got several possible practical products that could come out of this that could fund the effort further.

I watched several more of their their, and this one is perhaps the best one to understand what he is doing.

https://youtu.be/ysCV3dbzzWE

Seems like he's got several possible practical products that could come out of this that could help fund the effort further.

Thanks for posting the talk by Peter Lindemann. He came up with a design very similar to what we were talking about, I.e. integrating a heat pump with a heat engine.

Here is another video you may know about, which appears to be confirming some of your arguments.
https://youtu.be/hm8m_0rzyMo

Maybe the way to think about thermoacoustics is to observe that the random motion of particles holding a certain amount of heat energy is basically equivalent to noise, and vice versa. So if we can organize the noise by amplifying any resonance of motion of the particles, then we can take advantage ...

I'm guessing you may be trying to overcome the objections raised that a heat pump has greater efficiency with a small temperature difference, whereas a Stirling engine requires a high temperature difference. Yes, I am concerned about those objections. But I'm also not so concerned given the fact th...