Search found 3120 matches

by Tom Booth
Tue Mar 19, 2024 2:23 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Modified "Hot" Beta engine
Replies: 146
Views: 25545

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...
by Tom Booth
Tue Mar 19, 2024 12:09 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Perpetual Ideas
Replies: 78
Views: 74989

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 ...
by Tom Booth
Mon Mar 18, 2024 11:09 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Perpetual Ideas
Replies: 78
Views: 74989

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...
by Tom Booth
Mon Mar 18, 2024 8:49 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14850

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...
by Tom Booth
Mon Mar 18, 2024 7:56 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14850

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,...
by Tom Booth
Mon Mar 18, 2024 6:40 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14850

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...
by Tom Booth
Mon Mar 18, 2024 6:08 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14850

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...
by Tom Booth
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...
by Tom Booth
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...
by Tom Booth
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...
by Tom Booth
Sun Mar 17, 2024 8:32 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14850

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.

Resize_20240317_233543_3350.jpg
Resize_20240317_233543_3350.jpg (124.74 KiB) Viewed 172 times
by Tom Booth
Sun Mar 17, 2024 8:08 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14850

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...
by Tom Booth
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.
by Tom Booth
Sun Mar 17, 2024 7:12 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 thing I think is interesting is when he dumps out the rice, he comments on how hot it is. In this TNT video, about half way through the video he dumps out the aquarium gravel, after some minutes of dialogue and the gravel is still steaming hot. Resize_20240317_222427_7876.jpg https://youtu.be/69...
by Tom Booth
Sun Mar 17, 2024 6:07 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?

I'm pretty sure this one has not been posted here yet: https://youtu.be/g9JkmS18u1I?si=WdMqxZE43Y3Fb-Zl Amazing a plastic laundry bottle top works for this, and the plastic doesn't melt. Also, like the ceramic, non-heat, or very low heat conductivity above the boiler. Rice and plastic couldn't provi...