Stirlingengineforum.com

... The Carnot theorem, based on a description of a perfect engine, and when reversed, a heat pump, is a theoretical maximum that every real engine can't, never will, and never has, obtained. The only way to prove it wrong is to build an engine that exceeds the efficiency. It must be tested and ret...

Stroller wrote: ↑Sat Apr 27, 2024 3:09 pm ...cutting a thread on the top of the displacer rod guide and putting in a squishy O-ring with a screw down cap over it I can adjust easily, ...

Sounds like a more elegant design that does the job. Great idea.

The piston on my LTD stirling isn't as leaky as I thought it would be. I've just had the engine apart to tinker further with the temporary displacer, so I checked the iron piston clearance by setting it partway down the iron bore and pouring some 95% alcohol in to see how fast it would leak past th...

a2+b2=C2 would be pretty useless if it only worked for equilateral triangles. Pythagoras is spinning in his grave. :laugh: There is of course, no such thing as an equilateral right triangle. Which is the point. There is no such thing as a "perfect" Carnot engine either An algebraic formul...

You just type 5 paragraphs explaining that pistons leak How is a piston that stays cold, atmospheric temperature, going to heat up and seal? That's one reason I often make my own pistons if necessary, especially if running an engine on ice. Otherwise, as I've already said: "Most Stirling engin...

Yes. It's like being at a gas station. Adding a 1/4 tank of fuel. Driving for 400 miles. And saying wow, great milage on 1/4 tank 400%. Then putting 75% back in, to get to your starting point, and saying, "Ugh! I only got 25% percent." 100 out of 400. The difference for a heat engine is t...

You are mixing Stroller and my posts. No, Stroller & I apparently cross posted. I never even saw his post at all before posting. Yes the gas leaks by the piston in both directions. Nonsense. Now I can comment on Strollers post. Maybe if your piston and cylinder is so badly worn it can no longer...

Well, like I said before, you have some imagination.

Just reporting what you saw. Heated by a torch. Free piston getting closer to top/head, i.e., less gas cushion. Balloon not inflating because the same amount of gas is in the cylinder trapped by the balloon, but now on cold side of piston. What is there to imagine? You just wrote above: The piston ...

Sorry but using "all" of Qhz, all the "internal energy" down to absolute zero, all 100 joules added PLUS all the "given" 300 joules of "environmental heat" already inside the engine before heat was added, before the engine started, would be like 400% efficienc...

... If the cycle starts at Qcz, and DQh is added. It is then expanded doing work a maximum of Qhz Joules will be converted to work. The gas will be at T = 0 Kelvin and P=0. Now it must be compressed back to P=atmospheric an Tc=300 K. It will take 300 J to do so. That makes the machine's efficiency ...

Basically, plain and simply : n=(Qh-Qc)/Qh And : Q=Cv•M•T So : n = (Qh - Qc) / Qh n = (Cv•M•Th - Cv•M•Tc) / Cv•M•Th Simplifying : n = (Cv•M(Th-Tc) / Cv•M•Th Canceling : n = (Th-Tc) / Th If the cycle starts at Qcz, and DQh is added. It is then expanded doing work a maximum of Qhz Joules will be conv...

Begining of derivation: Taking the above 'noted' equation "Qhz = Qcz + DQh" and subtracting Qcz from both The term 'n' applies to the engine regardless of 'Qcz' base heat amount or reference point. I t will have the same efficiency burning the same energy at the same temperatures but with...

Begining of derivation: Taking the above 'noted' equation "Qhz = Qcz + DQh" and subtracting Qcz from both The term 'n' applies to the engine regardless of 'Qcz' base heat amount or reference point. It will have the same efficiency burning the same energy at the same temperatures but with ...

Tom, why would the balloon inflate? The gas heats up, expands, pushes the piston outward causing some inflation. The engine then runs. Any leakage by the piston would make the piston run closer to the closed end. The gas going by the piston would cool and return to it's original volume. Hence it wo...