Stirlingengineforum.com

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...

Fool wrote: ↑Thu May 02, 2024 1:49 pm

Tom Booth wrote:During the return stroke the gas is cold and TAKES IN heat rapidly rather than "rejecting" heat.

How does it absorb heat if the compression stroke starts at Tc? ..

Because it is in contact or is put in contact with Th.

For heat to be removed from the cold end, by the working fluid, it must have an _average_ temperature throughout the cycle, that is below that of the cold end. It's easy to postulate that the working fluid temp might drop below that temp briefly, but I'm really struggling to see how it could be bel...

Fool wrote: ↑Thu May 02, 2024 12:44 pm MikeB, you are correct.

Likely you are both wrong, if anyone knew what either of you are talking about.

For heat to be removed from the cold end, by the working fluid, it must have an _average_ temperature throughout the cycle, that is below that of the cold end. It's easy to postulate that the working fluid temp might drop below that temp briefly, but I'm really struggling to see how it could be bel...

VincentG wrote: ↑Thu May 02, 2024 10:34 am The displacer phase angle is not subject to my opinion.

OK, if you say so.

IMO the timing only "seems" different because of the opposed piston configuration makes it appear different.

Tom Booth wrote: ↑Thu May 02, 2024 12:13 pm
The stationary CHP units were for the bases back in the US.

Still in use apparently:

Google Earth coordinates:

40°30'02"N 112°22'24"W

Installation at Toole army depot.
Those are the earlier smaller versions without the cooling system though.