Search found 3122 matches
- Wed Mar 20, 2024 8:07 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
I look at heat as a continuous flow of energy. Trying to stop, convert, or alter it is like fighting the flow of a river. Instead, extracting energy while maintaining the flow is how I see it. In that respect, heat rejection to the sink is part of maintaining that flow. Well, you've stated the argu...
- Tue Mar 19, 2024 3:38 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Modified "Hot" Beta engine
- Replies: 146
- Views: 25564
Re: Modified "Hot" Beta engine
Do we at least agree, without reservation that SOME heat is converted to work (mechanical motion) in a heat engine? Then even an engine that has purely adiabatic expansion and contraction is excuting some mechanical motion not represented as work on the PV diagram. Let's take a single increment of e...
- Tue Mar 19, 2024 2:23 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Modified "Hot" Beta engine
- Replies: 146
- Views: 25564
Re: Modified "Hot" Beta engine
Now you are denying the reality of life. The PV diagram has nothing to do with Kelvin or Caloric Theory. It is merely a graph of pressure with respect to volume. It is a graph of real world measurable properties. In the majority of cases, PV diagrams are "ideal", hypothetical modeling, bu...
- Tue Mar 19, 2024 12:09 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Perpetual Ideas
- Replies: 78
- Views: 75008
Re: Perpetual Ideas
A bit of video: https://youtu.be/83wjLTWKXDk?si=Umo82cShViQOqXc1 This (the following, not mine) video does a good job of explaining all the necessary elements, many of which my test experiment is obviously lacking. https://youtu.be/xXJAkQscS2A?si=nMNDVQWzehQnFGYG Some videos include a foot valve on ...
- Mon Mar 18, 2024 11:09 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Perpetual Ideas
- Replies: 78
- Views: 75008
Re: Perpetual Ideas
For a long time I've been wanting to give the gravity pump idea posted early on in this thread a fair try. I couldn't imagine it could actually work as presented, but, I couldn't really figure out exactly why not. As water runs out, it creates a vacuum that draws more water in. Well I finally decide...
- Mon Mar 18, 2024 8:49 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
Also earlier on in the "rice engine" thread I posted these suggestions:: Resize_20221020_031311_1237.jpg Resize_20221021_170549_9068.jpg Tesla's idea, or goal, or reasoning was, if the supplied heat is converted to mechanical output so as to NOT be "rejected" to the "cold ho...
- Mon Mar 18, 2024 7:56 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
https://youtu.be/QYbHKzK-uEg?si=clTioWvCJalnPs15 That's all very interesting, but still, getting energy from a drinking bird toy seems like it could never be more than extremely low power and impractical how to scale it up? Giant drinking birds on the seashore? What I will be testing soon, I think,...
- Mon Mar 18, 2024 6:40 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
If you ask me, the only reason academia (or whomever) came up with this bogus, transparently ludicrous application of the so-called "Carnot efficiency Limit" formula is they could not admit any possibility of any kind of "perpetual motion" whatsoever, or even anything that looked...
- Mon Mar 18, 2024 6:08 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
As I've tried to point out before. The Carnot Limit makes perfect sense and I can more or less agree with it if a definition of "heat" is adhered to consistently. First "heat" is viewed as the joules supplied to (transfered to) the engine. Then "heat" is calculated by t...
- Mon Mar 18, 2024 4:51 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
- Replies: 134
- Views: 37342
Re: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
This idea seems to be a result of serendipity. According to a personal communication mentioned in Walker and Agbi [3], Prof. W. Beale observed a significant increase in pressure amplitude after a few drops of water were added into a Stirling engine—The oscillation was so strong and became a catastr...
- Mon Mar 18, 2024 4:24 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
- Replies: 134
- Views: 37342
Re: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
I had anticipated much of this here on the forum all the way back in 2006: https://stirlingengineforum.com/viewtopic.php?p=174#p174 I can't say where or on what forum I read about adding a little water and smoke in a Stirling engine, but I read recently that apparently the observation was first made...
- Mon Mar 18, 2024 3:53 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
- Replies: 134
- Views: 37342
Re: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
Another indicator that I think suggests support for the theory of a phase change taking place throughout the rice or gravel rather than it being limited to a gradient is Robert Murray-Smith's observations in the above TnT-Omnibus video that the amplitude (he calls it "frequency" but his ha...
- Sun Mar 17, 2024 8:32 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
In the above video, at the end of the last post, what is happening?
The gas is not expanding by absorbing heat. It is expanding at the expense of its own internal energy, causing it to become extremely cold.
The gas is not expanding by absorbing heat. It is expanding at the expense of its own internal energy, causing it to become extremely cold.
- Sun Mar 17, 2024 8:08 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14854
Re: Lets beat up Carnot
It seems that materials react physically before, or more quickly than they react thermally. For example, if you stretch a rubber band it gets hot and if held in a stretched out position long enough will gradually cool back down to ambient temperature. Now let it go and it snaps back instantly. But i...
- Sun Mar 17, 2024 7:36 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
- Replies: 134
- Views: 37342
Re: Absurdly simple thermoacoustic-steam "rice" engine – What's going on here?
One good thing about being able to use plastic or other nonmetallic material for the upper engine body is that it does not interfere with the linear generator.
With a metal can the magnet can be attracted to the metal resulting in a reduction in power output.
With a metal can the magnet can be attracted to the metal resulting in a reduction in power output.