Search found 113 matches
- Fri Sep 08, 2023 5:04 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Making Glass and Ceramic Stirling engines
- Replies: 47
- Views: 26322
Re: Making Glass and Ceramic Stirling engines
If the clay won't settle, I guess you'll just have to dry it like salt?
- Thu Aug 31, 2023 8:28 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Constant volume compression/expansion-displacer chamber analysis-heat powered mechanical amplifier
- Replies: 50
- Views: 30083
Re: Constant volume compression/expansion-displacer chamber analysis-heat powered mechanical amplifier
Tom/Vincent, Interesting thoughts. As ever, the real world proves more complex than any 'model/theory' however one thing to bear in mind here is that there are generally considered to be two entirely separate methods of heat transfer: Conduction (which seems to be what you are talking about above) b...
- Thu Aug 31, 2023 4:40 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The Carnot efficiency problem
- Replies: 258
- Views: 119598
Re: The Carnot efficiency problem
Helium for example can hardly be liquified by any extreme of external cooling and pressure, yet it can be liquified by this method of having it do work expanding in a cylinder to drive an engine to do external "work". Was that a typo? If the expansion of the gas cools it down far enough t...
- Wed Aug 23, 2023 7:47 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Free Piston Stirling Cooler able to cool down a room/house?
- Replies: 5
- Views: 3857
Re: Free Piston Stirling Cooler able to cool down a room/house?
The specs available on that site, at least at first glance, are essentially non-existent. I wouldn't touch it with a barge pole, and in any case, what is being advertised is little more than a basic kit - you would have to do a lot of work to adapt it to actually cool anything.
- Wed Aug 23, 2023 3:25 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Aligning heat "vectors"
- Replies: 25
- Views: 17376
Re: Aligning heat "vectors"
I hadn't heard of a "Jake Brake" before - are they really a thing?
My driving instructor taught me how to use engine-braking, then told me never to use the technique unless necessary, as brakes are somewhat cheaper (and easier) to replace than cylinder linings!
My driving instructor taught me how to use engine-braking, then told me never to use the technique unless necessary, as brakes are somewhat cheaper (and easier) to replace than cylinder linings!
- Tue Aug 22, 2023 5:33 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Aligning heat "vectors"
- Replies: 25
- Views: 17376
Re: Aligning heat "vectors"
I totally agree that the piston would have to remain "in rhythm" with the displacer, but the 'phase angle' would shift. If it shifted far enough, the engine is going to start to "skip a beat" and/or stop completely. I think you might struggle to find a servo that will run fast en...
- Fri Aug 18, 2023 5:49 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: if stirling engine is driven as reversed, does it work as cooler?
- Replies: 94
- Views: 48879
Re: if stirling engine is driven as reversed, does it work as cooler?
Tom, I really don't think it is nit-picking to say that gasses NEVER contract on their own, or that the outward pressure of any gas (by definition) is greater than any inter-molecular forces, or gravitational forces, or dark energy. Besides, surely the whole point of this discussion is to try and pi...
- Thu Aug 17, 2023 12:46 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Aligning heat "vectors"
- Replies: 25
- Views: 17376
Re: Aligning heat "vectors"
One experiment that I have yet to get around to, is de-coupling the displacer from the power piston, and therefore having two flywheels, one driven by the piston, and driving the load; the other driven by an electric motor and driving the displacer. It seems likely to me, that this would automatical...
- Thu Aug 17, 2023 12:38 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: if stirling engine is driven as reversed, does it work as cooler?
- Replies: 94
- Views: 48879
Re: if stirling engine is driven as reversed, does it work as cooler?
Tom, There is no such thing as a vacuum - the word is a useful concept, but in reality there is no such thing as a negative gas pressure. We would be in trouble if there were, as all of Earth's atmosphere would be sucked out into space. All of the demonstrations of a can/bottle/whatever imploding ar...
- Mon Aug 14, 2023 4:59 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: if stirling engine is driven as reversed, does it work as cooler?
- Replies: 94
- Views: 48879
- Fri Aug 11, 2023 2:55 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Displacer hot space vs cold space study
- Replies: 19
- Views: 3320
Re: Displacer hot space vs cold space study
In your spreadsheet diagram, do the purple sections indicate dead-space?
- Wed Aug 09, 2023 4:39 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The Carnot efficiency problem
- Replies: 258
- Views: 119598
Re: The Carnot efficiency problem
Tom, The simple point is that we all know that you cannot get power out of a machine without putting energy in. We can all discuss perpetual-motion as part of understanding the operation of a "perfect" Stirling engine, ie one with zero friction, but "free energy" is a whole 'noth...
- Tue Aug 08, 2023 4:25 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The Carnot efficiency problem
- Replies: 258
- Views: 119598
- Fri Aug 04, 2023 4:08 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The Carnot efficiency problem
- Replies: 258
- Views: 119598
Re: The Carnot efficiency problem
Tom, It seems to me that a very simple experiment is possible, and hopefully useful, which is to de-couple the displacer from the piston of a suitable engine - probably by connecting a second flywheel. My question was meant to be somewhat rhetorical, and based round logical thought experiments but p...
- Thu Aug 03, 2023 7:14 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The Carnot efficiency problem
- Replies: 258
- Views: 119598
Re: The Carnot efficiency problem
Goofy, What is the point of the displacer? Is it needed?