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I've had recently what I feel is a new insight into the value of a regenerator. I never thought it worth much as a means of storing excess "waste heat" that would otherwise be lost, on the basis that a well designed efficient engine shouldn't have any waste heat, but even so, it seems such...

... Longer stroke increasing adiabatic cooling? Wouldn't that also increase adiabatic compression, for an identical adiabatic temperature rise reverse stroke? Remember the gas is in the cold space more so, during compression? Hmmm ... This is your constant refrain, but it is apparently wrong. The m...

Kind of reminds me of my old "hot potato" engine hot_potato_engine.gif Or the more recent "Ringbom" type actuated "hot potato" Resize_20230929_120924_4460.jpg https://stirlingengineforum.com/viewtopic.php?p=22527#p22527 Both are Essex type single cylinder opposed piston...

For me it looks like more beta, because it is possible to reduce dead volume on compression stroke - power piston can follow into displacer area like in beta type ? Very interesting. I had thought as much, but not having the actual engine I wasn't completely sure. I'm wondering if any Essex engines...

Not exactly, but kind of similar in principle to an idea I was exploring a while back, I think maybe:
viewtopic.php?t=5578

https://m.youtube.com/watch?v=P11q-BAhvqk You claim the engine was running for three hours, but it is clearly removed from the heat seconds before all measurements are made. Placed on a "cold" ambient table cooling it enough that even when placed back on the water cup, with mist coming of...

The gas liquefaction process is pretty simple. 1) Cool and compress the gas. 2) Expand the gas while making it do work. Well for a power producing engine we really don't want to throw the heat/energy away to just make cold to liquify the gas, we want to get the work out of the gas as it expands. If ...

...There are people reading this that will get it.... Get what? As far as I'm concerned you seem like one of the "good students" who learned dutifully to memorize and regurgitate the 200 year old obsolete so-called "science" of Carnot "calorics" theory without question...

An interesting video on adiabatic expansion-cooling. https://youtu.be/4GL2jj6XJGk Note however, these demonstrations do not involve expanding the gas inside an engine cylinder to drive a piston to do shaft work, which is much more effective . The only "work" involved in these demonstration...

A very old but still ongoing debate. One thing not addressed in the above exchange is the "vacuum" produced to initiate the return "power stroke" that is cooling by the displacer shifting the working fluid to the cold side causing the gas to "contract", being assisted o...

This is after three hours running on boiling hot water. That entire engine top has an aluminum cylinder fused together with the aluminum top plate. A stock engine. The power cylinder and cold plate are stock, as they came in the kit, unmodified, not insulated, no acrylic, no aerogel. Only the sides...

...I found it interesting that static test froze LTD...akin cold going to hot vs hot going to cold.... That was rather perplexing. I think though, it is more a symptom of a lack or "heat flow from hot to cold" vs. boyancy. The engine is down in an insulated "cold hole". I had ex...

I think it would be helpful to put pressure and volume values on these ideal PV graphs. Senft was going in the right direction including "buffer pressure" and talking about "constant mechanical effectiveness" which Matt considers a "free lunch". That's not all that's m...

Fool, Your basing your conclusions on largely false, incomplete, obsolete theory. If the "Ideal gas law" for example was literally true, there would be no such thing as refrigeration and air conditioning. No such thing as liquefaction of gases or evaporation. If kinetic theory were literal...

Compress_20240504_125427_7507.jpg Here you can see actual, physical real world data. The results of actual experiment. Solid empirical data. Not charts, not graphs not hypothetical, theoretical "modeling", not questionable mathematical number juggling. If you want to dismiss it offhand, t...