Stirlingengineforum.com

There are various materials you could make a high temperature displacer out of. Since the displacer is already counterbalanced, weight is not really an issue. Large sheets of pressed mica bonded with silicone are available as "cut to fit" wave guide cover replacement for microwave ovens, o...

..... So I'm not sure how long a 'dwell' of no heat input Tom thinks would improve the dynamics. Imagine someone being pushed on a swing. The "dwell" would be the entire time the swing is not being pushed. Ideally the heat input should be variable so that it could be extended when additio...

... But heating of the working fluid needs to recommence as soon as the displacer starts to shift it back from the cold end, which happens before the piston reaches BDC. So I'm not sure how long a 'dwell' of no heat input Tom thinks would improve the dynamics. You are,... sort of right, if by "...

....the big problem with those points is that Tom doesn't believe in 'constant T volume change', neither expansion nor compression. He believes in adiabatic. And he thinks adding an electric generator will change that process. Granted, real processes are somewhere between adiabatic and constant T, ...

There are additional factors not indicated or apparent looking at a typical PV diagram. Real engines have actual physical mass, which has inertia and momentum. Reciprocating engines have pistons which have weight, velocity and momentum. pv_velocity_momentum.jpg From TDC (far left) to midway towards ...

.... At this point I respectfully request that, would Tom please give us an image of a PV diagram with his proposed cycle drawn. Tom is very good at providing images and graphs. .... This is a real time tracing of an LTD Stirling: stirling_pv_real.jpg https://youtu.be/ck8thAoi_rA?si=Khb77JAOWyneplv...

Tom, If you could build an engine that had ice at the cold end, but that ice never, ever melted, what role would it have within the engine? My intuition says that if no heat/energy transfers into the ice, then it isn't having any effect on the engine cycle. It's not too difficult to conceptualize i...

Carnot efficiency theory, or whatever you want to call it dictates that the 75 joules go into the "cold reservoir" period. No option for using it for "back work". It is rejected as heat, because supposedly it is "impossible" for it to be converted to work positive, neg...

My derivation shows how absolute energy gets substituted for Delta energy. The same amount gets used by the engine but it becomes clear as to were it must be spent. 25 J on work, 75 J on back work, and or, heat transfer. The transfer of lower temperature heat, helps get more power out of the comple...

The comparison to cooling is only to bring in absolute zero K, and have some reference to calculate the absolute energy contained in the engine at rest before even heating it to Th. It is an absolute accounting of total energy. Sort of like having a pot of money, say 300 dollars. Someone asks to ge...

If the gas is at 300 K, one doesn't need to ask how it got there. We just use it as an absolute quantity of energy. Yes we do! How the "heat" got into the engine is the whole basis of "efficiency". You have 300 joules that make up the very pre-existing mass and energy of the &qu...

I see that you are challenging the Qcz term. It technically should use the U variable name. I used 'Q' because I'm only modeling the internal thermal energy . Since it can be represented as coming only from heat input , I thought it would be okay to represent it as a name similar to heat. It is jus...

Well, right off the bat I see the same conceptual difficulty with: Let Qhz be the internal energy from heat added to the cycle all the way from zero K Kelvin to Th. We add 100 joules at a temperature of 400°K As stated previously "internal energy from heat ADDED to the cycle all the way from z...

... Heat is flowing through an engine. The flow isn't any particle, or caloric, nor does the "flow" cause the work. It is necessary to produce pressure increase and decrease. Heat in, higher pressure. Heat out lower pressure, back work. Calorics have been discarded completely in main stre...

It's quite difficult to find a demonstration using air, but same principle. Heat under a Stirling engine vs. above. https://youtu.be/tR_Oc2Ky2vA?si=21gxEMgHqRU7QvFk With the ice under the engine, the natural buoyancy of the air tends to prevent the heat from moving down into the working fluid. Even ...