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Tom I actually think possible the self cooling aspect of these engines you are exploring. But these ir guns are finicky, even my expensive one. If you paint everything flat black, then we can start talking. It still will not be a very accurate overall reading, but at least the general comparison of...

Compress_20240504_125427_7507.jpg For supposedly not doing any work, the heat from friction at the power piston is easily visible, at least 12° ∆T above the "cold side" generally So that is 12 joules of heat generated from mechanical motion 0 joules of "waste heat" going out thr...

The flywheel on your small engine is very light and is as easy to turn as it is to stop. So there's not much work being done for heat to be converted into. Logically, a well insulated engine is going to equilibriate with and accept very little heat from the heat source. So if there's not much heat ...

All very interesting Tom. In the test I just did with my 'LTD' (now a medium T diff) I found the engine was still speeding up as the 'cold' side got hotter, even though the hot side was stable at 148C. Whether this is due to bearings getting freer as they warm, or the wire wool round the edge of th...

Maybe you might also be interested in this experiment. A different model but this engine also has acrylic sides and top for retaining heat, or put another way, to eliminate the cold "sink". In addition to the low heat conductive acrylic, I also put additional Styrofoam insulation on the in...

at least I tried to.... you can't measure what isn't there. Of course fool and company just say I'm not getting an increase in temperature because my little toy Stirling engines use such an infinitesimal amount of heat and are so so inefficient and produce such little power the heat leaving the eng...

Tom, IIRC you were the first to mention fridge's. We seem to be in agreement that they have little relevance to this discussion. What? I have no idea how you arrived at that conclusion. Refrigeration systems generally are HIGHLY relevant. For one thing Stirling engines ARE a kind of refrigeration s...

Fool wrote: ↑Fri May 03, 2024 6:15 am ....

You've made a number of very important and highly significant talking points, which I've highlighted here.

I'll comment on them all in full another time.

Unfortunately, I've never been able to find specifications. If the minimum operating temperature is 600° maybe it used some high temperature heat transfer fluid for "coolant". With water it could never reach operating temperature without boiling. They wouldn't have used water because of t...

Unfortunately, I've never been able to find specifications. If the minimum operating temperature is 600° maybe it used some high temperature heat transfer fluid for "coolant". With water it could never reach operating temperature without boiling.

My point really was that it's a good example of how NOT to build a Stirling engine. Personally, I'm skeptical it ever worked at all. The solar input area is nearly adjacent to the water jacket. 6000° metal alloy tungsten or whatever hot enough to vaporize stainless steel contiguous with a cooling ja...

hot air has no chance of putting enough heat into the engine. Just glanced off, but doesn't penetrate. Too much air volume. Not enough concentrated heat. What you need is a big parabolic mrror and a sunny day. How difficult is it to build one do you think? By chance I visited a place in the foothil...

So during the expansion stroke the gas is in contact with Tc? The working fluid is shifted from the hot side to the cold side about 1/2 the way to BDC (between full compression and full expansion), so yes. for the latter mostly adiabatic phase after most of the heat input has been used up (converte...

I'm sorry you feel that way. How would you like me to feel? Appreciative of your constant badgering, insults, accusations, long rambling posts full of mischaracterizations, strawman arguments and pure nonsense that wastes mine and everyone else's time and fills the forum with rubbish? Thanks for ke...

... I like Tom too. I fear his patience is wearing thin for reading points that support classic theory, and contradict his. An understatement. "Classic theory" is 100% garbage that should have been taken out to the curb and forgotten at least a century ago. That it's still being advocated...