Search found 110 matches
- Fri Jul 07, 2023 9:20 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Ambient heat engine design theory
- Replies: 8
- Views: 2388
Re: Ambient heat engine design theory
What's the comment on the left, about "cold steam" all about?
- Fri Jun 23, 2023 12:58 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Carnot reveal for Tom
- Replies: 162
- Views: 173642
Re: Carnot reveal for Tom
Firstly - proving that Carnot is wrong is actually easier than proving it is correct - essentially Tom is claiming that Reindeer CAN fly, which is easy to prove (if true) - just need to see one flying, and/or show appropriate Maths. Secondly though, you I need to support part of (what I understand) ...
- Mon Jul 04, 2022 9:06 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling "Hit 'N' Miss" Hot air engine
- Replies: 46
- Views: 17095
Re: Stirling "Hit 'N' Miss" Hot air engine
For the two-stroke engines, would it be possible to invert them, and effectively have a sump above the pistons?
- Mon Jul 04, 2022 8:22 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Duel IC EC engine?
- Replies: 2
- Views: 2824
Re: Duel IC EC engine?
What that diagram doesn't make clear, is what the two parts of the engine are meant to do? If they are intended to be linked to a common shaft, then I would suggest that that is a very bad idea - allegedly simply linking two IC engines to the same shaft is a very big deal, so getting the power outpu...
- Tue Jun 21, 2022 8:22 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Looking for diagram of a simple and effective Stirling heatpump
- Replies: 18
- Views: 25820
Re: Looking for diagram of a simple and effective Stirling heatpump
If I may expand slightly on an earlier comment or two - a "Stirling Heat Pump" is a fairly well-known device, though rarely needed/built by amateurs, I suspect! As noted, it needs something to drive it, which can just as easily be a "Stirling Engine" as anything else.
- Tue Jun 07, 2022 7:53 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Brent Van Arsdell Limited Edition restoration
- Replies: 37
- Views: 24342
Re: Brent Van Arsdell Limited Edition restoration
May I suggest cutting a larger disc for the base, then those supports can still be used, but twisted at an angle to match?
- Thu Dec 02, 2021 9:37 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Brainstorming ideas to make more power
- Replies: 6
- Views: 1511
Re: Brainstorming ideas to make more power
If valves and such are involved, you need to be looking at some of the relatives to the Stirlings, such as the Manson Engine
- Mon Nov 01, 2021 4:36 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's "Ambient Heat Engine" Experiment
- Replies: 175
- Views: 192887
Re: Tesla's "Ambient Heat Engine" Experiment
Close, but not quite - the retro-reflective materials that they use on road signs etc rely on hemi-spheres, not full-spheres - like having a million tiny parabolic satellite dishes. Even then, only about 50% of them point in the right direction, and since they aren't parabolic, those that do reflect...
- Wed Oct 20, 2021 4:17 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Engine Thermodynamics
- Replies: 251
- Views: 105036
Re: Stirling Engine Thermodynamics
Far from being a curiosity, in my solar engine, the water vapor condenses in the power cylinder and will slow it down and then stop it. Have you tried using silica gel (or other dessicant) to dry your air? It doesn't need to be pressurised to do this, you just need a decent seal to ensure that the ...
- Mon Oct 18, 2021 5:22 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Engine Thermodynamics
- Replies: 251
- Views: 105036
Re: Stirling Engine Thermodynamics
If it helps, bear in mind that some commercial Stirlings use Hydrogen or Helium as the working gas, so no mixture or water vapour effects. As far as I know, these are more efficient, but don't work substantially differently from air-based engines.
- Fri Oct 15, 2021 8:46 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Engine Thermodynamics
- Replies: 251
- Views: 105036
Re: Stirling Engine Thermodynamics
Tom, I see you mention "molecular attraction" again - I'm not aware that any common gas has this property; indeed I was under the impression that a truly un-constrained gas would expand to fill whatever container it is in, regardless of temperature and pressure. Maybe I'm misunderstanding ...
- Wed Oct 13, 2021 8:16 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Engine Thermodynamics
- Replies: 251
- Views: 105036
Re: Stirling Engine Thermodynamics
"Why do these various engines have heavy weights on the diaphragm "pistons"?" I suspect the main reason is that the engine is at atmospheric pressure inside, at rest. Once the engine has been 'fired up' the internal pressure will rise substantially. For a diaphragm-based engine i...
- Tue Oct 12, 2021 5:05 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Engine Thermodynamics
- Replies: 251
- Views: 105036
Re: Stirling Engine Thermodynamics
I quite agree with Tom: the mass of a piston is directly _ counter _ to the ideal operation of _ any _ engine - a massless piston is always going to be better overall than a heavy one.
- Thu Oct 07, 2021 9:10 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Programmatic control of Stirling Engines
- Replies: 30
- Views: 18876
Re: Programmatic control of Stirling Engines
To be positive for once - you don't need to measure temperature - you have a known (though not entirely fixed) volume of gas, so if you are able to measure the pressure then you can calculate the temperature from that. Whether pressure sensors are significantly faster than temperature sensors I have...
- Tue Oct 05, 2021 4:50 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Programmatic control of Stirling Engines
- Replies: 30
- Views: 18876
Re: Programmatic control of Stirling Engines
That video of adiabatic bounce is quite a clever demonstration, but I have to point out: As you note, no REAL work is done - in our nice, perfect frictionless theoretical world, the 'piston' will continue to oscillate perpetually. But without doing any work, which is the fundamental point of any eng...