Search found 3441 matches
- Tue May 07, 2024 10:45 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling engine / Hydrogen storage system
- Replies: 2
- Views: 2690
Re: Stirling engine / Hydrogen storage system
There is a rather astonishing demonstration of a Stirling engine running on hydrogen gas. Or heat from hydrogen gas but without a flame. The outside of the displacer chamber is coated with some kind of catalyst. The demonstration is well into the video about 23 minutes almost at the end Here he's de...
- Tue May 07, 2024 9:07 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Wilcox Caloric, 1860, open-cycle, regenerator
- Replies: 3
- Views: 49
Re: Wilcox Caloric, 1860, open-cycle, regenerator
The description of the regenerator found here: http://hotairengines.org/open-cycle-engine/wilcox-1860/wilcox-hot-air-or-caloric-engine Seems very different from what is depicted in the illustration above. The regenerator design is quite interesting in that it expands radially outward from the center...
- Tue May 07, 2024 11:07 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's Ambient Heat Engine revisted
- Replies: 107
- Views: 1146
Re: Tesla's Ambient Heat Engine revisted
One thing I haven't tried yet, I don't think, is running one of the modified LTD engines with a retrofit regenerator on ice/ambient heat. Well, I did once and the engine froze up, or something. Anyway, a slight modification of the drawing I posted earlier in the thread: Compress_20240507_135720_0200...
- Tue May 07, 2024 10:05 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 15
- Views: 6722
Re: Stirling essex - beta or gamma ?
You could be right. I would have basically agreed up until yesterday, given my newly found "inspiration" that a regenerator is actually, perhaps, more for cooling. To take heat temporarily out of the picture during compression, rather than for just conserving heat necessarily. I can say, a...
- Tue May 07, 2024 8:26 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 15
- Views: 6722
Re: Stirling essex - beta or gamma ?
Due to the thin brass walls(.015") of the main tube, displacer and power piston, the original Essex has pretty effective regeneration without any additional dead space or flow restriction. I'll try to film a thermal video to show this later. True to some degree I guess. But a "regenerator...
- Tue May 07, 2024 7:50 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's Ambient Heat Engine revisted
- Replies: 107
- Views: 1146
Re: Tesla's Ambient Heat Engine revisted
"Pretty obviously the elevated heat signature appearing around the power piston could only be from "work"." Why is that? Could the heat not come from the working fluid? Well, maybe. How? It's the cold side of the engine. The top of the engine in contact with the working fluid is...
- Mon May 06, 2024 11:14 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Regenerators.... Have I got it straight what they do?
- Replies: 7
- Views: 1508
Re: Regenerators.... Have I got it straight what they do?
I've had recently what I feel is a new insight into the value of a regenerator. I never thought it worth much as a means of storing excess "waste heat" that would otherwise be lost, on the basis that a well designed efficient engine shouldn't have any waste heat, but even so, it seems such...
- Mon May 06, 2024 9:57 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's Ambient Heat Engine revisted
- Replies: 107
- Views: 1146
Re: Tesla's Ambient Heat Engine revisted
... Longer stroke increasing adiabatic cooling? Wouldn't that also increase adiabatic compression, for an identical adiabatic temperature rise reverse stroke? Remember the gas is in the cold space more so, during compression? Hmmm ... This is your constant refrain, but it is apparently wrong. The m...
- Mon May 06, 2024 9:21 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 15
- Views: 6722
Re: Stirling essex - beta or gamma ?
Kind of reminds me of my old "hot potato" engine hot_potato_engine.gif Or the more recent "Ringbom" type actuated "hot potato" Resize_20230929_120924_4460.jpg https://stirlingengineforum.com/viewtopic.php?p=22527#p22527 Both are Essex type single cylinder opposed piston...
- Mon May 06, 2024 9:04 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 15
- Views: 6722
Re: Stirling essex - beta or gamma ?
For me it looks like more beta, because it is possible to reduce dead volume on compression stroke - power piston can follow into displacer area like in beta type ? Very interesting. I had thought as much, but not having the actual engine I wasn't completely sure. I'm wondering if any Essex engines...
- Mon May 06, 2024 8:25 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Wilcox Caloric, 1860, open-cycle, regenerator
- Replies: 3
- Views: 49
Re: Wilcox Caloric, 1860, open-cycle, regenerator
Not exactly, but kind of similar in principle to an idea I was exploring a while back, I think maybe:
viewtopic.php?t=5578
viewtopic.php?t=5578
- Mon May 06, 2024 8:05 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's Ambient Heat Engine revisted
- Replies: 107
- Views: 1146
Re: Tesla's Ambient Heat Engine revisted
https://m.youtube.com/watch?v=P11q-BAhvqk You claim the engine was running for three hours, but it is clearly removed from the heat seconds before all measurements are made. Placed on a "cold" ambient table cooling it enough that even when placed back on the water cup, with mist coming of...
- Mon May 06, 2024 7:26 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Compression cycle.. worthwhile?
- Replies: 10
- Views: 9833
Re: Compression cycle.. worthwhile?
The gas liquefaction process is pretty simple. 1) Cool and compress the gas. 2) Expand the gas while making it do work. Well for a power producing engine we really don't want to throw the heat/energy away to just make cold to liquify the gas, we want to get the work out of the gas as it expands. If ...
- Mon May 06, 2024 7:15 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 484
- Views: 25055
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
...There are people reading this that will get it.... Get what? As far as I'm concerned you seem like one of the "good students" who learned dutifully to memorize and regurgitate the 200 year old obsolete so-called "science" of Carnot "calorics" theory without question...
- Mon May 06, 2024 6:23 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Compression cycle.. worthwhile?
- Replies: 10
- Views: 9833
Re: Compression cycle.. worthwhile?
An interesting video on adiabatic expansion-cooling. https://youtu.be/4GL2jj6XJGk Note however, these demonstrations do not involve expanding the gas inside an engine cylinder to drive a piston to do shaft work, which is much more effective . The only "work" involved in these demonstration...