Stirlingengineforum.com

So you have a pressure differential of maybe 2 psi that drives the piston out during the power stroke, but you think a pressure differential of 14.7 or absolute zero internal pressure is required on the return stroke? Who said it's required? ... Well, "fool" has been arguing all along tha...

Again, 90° or π/2

Coincidence?

https://youtu.be/jewSVEBkI_s

Given that a Stirling engine is a driven mechanical oscillator. I think that this MIT demonstration quite possibly reveals why a 90° phase angle on the displacer is necessary:

https://youtu.be/aZNnwQ8HJHU

It's pressure difference that matters not absolute pressure. Reducing the internal pressure to say 10 psi is the equivalent of 14.7 - 10 or 4.7 psi of external pressure. That still leaves 10psi fighting the atmosphere on the return stroke. That's what the equation is validating. It's really beyond ...

Personally, I don't see why combining a Stirling engine with a heat pump should be so "impossible"

The only "back work" is in your imagination, and that of every other Carnot limit advocate I suppose. Tom, even with a completely ambient pressure driven return stroke, the internal gas is still being compressed, hence the back work. The only way to get a free ride is if internal pressure...

Stainless steel is pretty non-conductive to begin with, so if the SS utensil pot is mostly heated on the bottom there might not be much thermal creep to worry about up that high. I've sometimes thought with SS it might actually be a good idea to electroplate the outside with copper, like a copper bo...

... possibly using a material that would place a thermal barrier between the hot and cold ends to reduce "thermal creep". I "could" place an insulating ... I agree. Something that would form a thermal barrier would be best, for what I think should be obvious reasons. You want as...

. ... Tesla, wrote his article during a time when the second law, and Entropy were being hotly debated and still unknown to most. He probably spent the rest of his life trying to figure out that his ambient cold hole scheme can't work. He was unsuccessful in building one. Entropy and the second law...

... If Tesla, and others, are right, where are the devices? Why can't we buy them today? I could really use free energy. It's a wonder. You may have to visit the island nation of Vanuatu. Maybe someone should ask Jeff Muller what happened to his perpetual air compressor. I don't know, but it's hard...

.... It is impossible to compare fuel tank levels with internal energy levels because it is just as easy to fill the top 1/4 of a tank as the bottom 1/4, and it is harder to fill at higher temperature than zero Kelvin, it harder to compress 14.7 psi than zero psi. That is the penalty of back work a...

It seems Tesla didn't speak or write anymore publicly about his ambient heat engine after the article in 1900, but apparently kept working on it until around 1930 ? I don't know any more than what he put in that article. What seems interesting to me about compressed air is as the air is compressed t...

I think that chart is for steady state currents and temperatures and COP's. At 0.1 times Amax, it will produce 10° of delta T, at a COP of 2. At 0.2 times Amax, it will produce 20° of delta T, at a COP of .7 Very tiny amounts of power for small steady state COP's, and delta T's, max. Not sure how r...

What Jeremiah says near the begining of this video about the importance of the pump to create a vacuum in the turbine to greatly increase the efficiency of the turbine also sounds very similar to what you are proposing, using the pump as a kind of replacement for a cold condenser. https://youtu.be/h...

Personally, Paul here seems to know what he's talking about. https://youtu.be/f4UmvPLmV40 In this interview he mentions ienergysuoply (Jeremiah) as a partner he was working with, which makes me tend to think Paul may have been Jerimiah's partner that died, but whatever the case he seems to not be co...