Search found 708 matches
- Thu May 23, 2024 1:44 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
The compressed air thing is interesting in its own right, but my main point is that there seems to be no evidence that heat energy is actually converted to GPE, just that heat energy can be used to gain GPE.
- Thu May 23, 2024 6:49 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's "Ambient Heat Engine" Experiment
- Replies: 209
- Views: 194046
Re: Tesla's "Ambient Heat Engine" Experiment
I recently found an old dirt devil vacuum powered brush head attachment. It has a squirrel cage style fan blade and a belt drive to a brush head. It has a surprising amount of torque. Just for fun I hooked it to the vacuum and ran it up for a few minutes loaded and unloaded while checking temperatur...
- Wed May 22, 2024 6:11 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Conversion to work is not "direct thermal transfer", and it is also not "reversible", and for the most part, cannot be "recycled". I am not suggesting perpetual motion. I am suggesting an improbable theoretical cycle where assuming no losses, by temperature degradation...
- Wed May 22, 2024 8:46 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
The way I would phrase this, assuming the heat is not in fact destroyed, by any other means than direct thermal transfer, is that the same heat energy, if it could be recycled at 100% efficiency, would produce its equal amount of work over and over again.
- Wed May 22, 2024 7:46 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Well Tom you said it yourself. If the answer to my question violates the laws of thermodynamics, then it is certainly outside of tradition.
- Wed May 22, 2024 7:27 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
I would prefer all parties engage in the discussion.
Stroller and Fool represent the more traditional, proven, mainstream science. Tom is certainly on the fringe, along with me perhaps, just looking for answers.
Stroller and Fool represent the more traditional, proven, mainstream science. Tom is certainly on the fringe, along with me perhaps, just looking for answers.
- Wed May 22, 2024 4:21 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Regarding the latest round of discussions, any extra weight presented to the piston when the starting condition is only 14.7psi will no longer allow a doubling of volume. The more weight, the more the expansion becomes closer to Cv. This, at the sweet spot, should minimize the amount of energy neede...
- Wed May 22, 2024 4:15 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Stroller wrote: ↑Tue May 21, 2024 5:24 am It's the action of the expanding gas "consuming" energy that I am interested in. Is internal energy really reduced when the gas expands, other than by conduction losses to the surrounding colder surfaces of the engine. And if so, how exactly? The ...
- Tue May 21, 2024 7:24 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Well, "adiabatic" IS without any kind of thermal transfer in or out of the gas. To me that is a less complex scenario than isothermal which for every joule of work done by the gas an equivalent amount of heat is added to replace it. Very true, but my point being that an adiabatic expansio...
- Tue May 21, 2024 7:03 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Tom that was a good response and about sums up what I would ask. By "free expansion", I believe Stroller and I had settled on the baseline of the gas expanding against one atmosphere. So it's still doing "work". I think, for now, thinking in terms of an isothermal expansion is le...
- Tue May 21, 2024 4:20 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
In any example, we would use the minimum amount of gas needed to do the work at hand. By degrades, I mean into a lower temperature state. It's the action of the expanding gas "consuming" energy that I am interested in. Is internal energy really reduced when the gas expands, other than by c...
- Mon May 20, 2024 7:22 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Heat isn't a substance, it's manifested as a flow of energy from a hotter body to a colder body. Energy is neither created nor destroyed, but it can get translated from one thing to another. In our example, the extra Joule started out as additional energy passed from the external energy source into...
- Mon May 20, 2024 3:54 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Regarding the copper verses steel block, I assume it is a weight difference. Just remember moving the displacer up and down is a temperature difference. Although both would move, I would think there would be a difference. I don't know how much. Pressure would be constant for both, but higher for th...
- Mon May 20, 2024 1:25 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Moving to the 5lb weight makes a tremendous systemic difference when the starting pressure rises 4psi from 4 extra pounds across one square inch of piston surface.
I'll think about your response until tonight.
I'll think about your response until tonight.
- Mon May 20, 2024 1:09 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 618
- Views: 29841
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
I thought I had filmed the heavy steel block but I did not. It moved just the same as the copper bar.
https://youtube.com/shorts/WPtcVRK35nU? ... 3tzGUxqpzn
https://youtube.com/shorts/WPtcVRK35nU? ... 3tzGUxqpzn