I’d like to have some confirmation of the test temperature ratio.The ratios are very interesting to me. I’ve been thinking, (assuming?) that the compression ratio should be about half of the temperature ratio. But I’m still not too old to either learn or get more confused.
Bumpkin
Search found 280 matches
- Fri May 05, 2023 10:11 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )
- Replies: 32
- Views: 9384
- Thu May 04, 2023 12:03 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )
- Replies: 32
- Views: 9384
Re: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )
Hey Matt, I hadn’t noticed that 25-40 ratio — had to go back and find it to see if you weren’t hallucinating. It might be a misinterpretation or misprint, otherwise yes I’m surprised the engine runs at all at that temperature ratio. It would be working against itself as a heat-pump for much of each ...
- Fri Apr 07, 2023 9:17 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: High temperature displacer
- Replies: 191
- Views: 81078
Re: High temperature displacer
Tom, I don’t know if this relates to your pursuit, but Ive been looking at open-cell metal foam for a high-temp regenerative displacer. Anyway I happened on this site which has some interesting links and data: https://ergaerospace.com/metal-foam-material/
Bumpkin
Bumpkin
- Mon Mar 27, 2023 9:31 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD Stirling Engine Development-Displacer Design
- Replies: 51
- Views: 24975
Re: LTD Stirling Engine Development-Displacer Design
Vincent, for light-weight high-temp insulation you might try carbon felt welding blanket. A downside for your purpose is that it’s permeable so it would add dead space. Actually I bought mine in hopes it might breath well enough to use as a displacer. (It doesn’t.) Anyway it’s a neat material; light...
- Sun Mar 26, 2023 10:33 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: A New Type of Hot Air Engine
- Replies: 121
- Views: 19302
Re: A New Type of Hot Air Engine
Something I ran across that might relate or be thought-fodder for the topic a few pages back: https://go.gale.com/ps/i.do?id=GALE%7CA583382506&sid=googleScholar&v=2.1&it=r&linkaccess=abs&issn=17881994&p=AONE&sw=w&userGroupName=oregon_oweb&isGeoAuthType=true Bumpkin
- Tue Mar 07, 2023 12:27 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: My contribution to the ECE
- Replies: 120
- Views: 18532
Re: My contribution to the ECE
Hey Vincent, it’s interesting that you’re looking at wood power and maybe using a 55 gallon barrel. I’ve got a barrel in my shop dissected and about ready for reassembly for the same purpose, to replace in the same foot-print my current shop-stove, and cogenerate a bit of charge for my solar battery...
- Thu Mar 02, 2023 9:41 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: My contribution to the ECE
- Replies: 120
- Views: 18532
Re: My contribution to the ECE
Sorry, Tom, looks like I dropped in right behind you and might have hidden your post. Some random thoughts: Vincent, you mentioned “no free lunch” with the magnetic actuation, I reckon that would apply to most all of the start-and-stop methods except maybe your desmo cam where just like a crank, the...
- Thu Feb 02, 2023 9:50 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Engine Thermodynamics
- Replies: 251
- Views: 103690
Re: Stirling Engine Thermodynamics
Hey Tom, if the engines shared the middle plate, longer screws could bridge from hot side to hot side and eliminate the thermal short of the fasteners to the middle too.
Bumpkin
Bumpkin
- Mon Jan 16, 2023 10:30 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Rider Ericson Hot air engine from casting
- Replies: 1
- Views: 1704
Re: Rider Ericson Hot air engine from casting
That is a really nice model. I don’t do much machining myself, except just enough to appreciate those who do. Mostly just weld and grind and beat on stuff. I have a lathe and such, but it hardly ever gets uncovered from the grime on the workbench. Thanks for sharing.
Bumpkin
Bumpkin
- Mon Dec 05, 2022 11:54 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Why can't I "just buy" a stirling engine?
- Replies: 39
- Views: 8577
Re: Why can't I "just buy" a stirling engine?
Here’s one we’ve been watching a few years — God I hate how I can’t seem to copy and paste anything lately — anyway go to “seftonmotors.com” I’m not touting them or not, but I think they’re real. Seems they’re behind on deliveries, but that’s good news for most kickstart endeavors. Bumpkin
- Sat Dec 03, 2022 10:40 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: My first Stirling Engine
- Replies: 3
- Views: 2063
Re: My first Stirling Engine
I like that Boyd engine; and there seems to be more plans available there since I’s; well, it’s hell getting old.
- Sat Dec 03, 2022 10:20 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: NASA Stirling Engines (Stirling "convertors")
- Replies: 42
- Views: 32202
Re: NASA Stirling Engines (Stirling "convertors")
Hey look, I posted twice in one day. (getting closer to retirement) Guess I’s somewhat bothered about this: “You make up lies about me, then claim I'm not credible based on your previous lies and misrepresentations.” Geez Tom, shi&, but OK— OK. if you can demonstrate my “lies” then have at it. I...
- Sat Dec 03, 2022 11:44 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: NASA Stirling Engines (Stirling "convertors")
- Replies: 42
- Views: 32202
Re: NASA Stirling Engines (Stirling "convertors")
Tom, I appreciate how in a later post (Where do you get the time?) you demonstrate having come around to a lower, more competitive cost per watt for PV. So we can compare apples to apples and let the best apple win. I think we both root for Stirlings. I just want to be sure we keep fair score for th...
- Fri Dec 02, 2022 10:36 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: NASA Stirling Engines (Stirling "convertors")
- Replies: 42
- Views: 32202
Re: NASA Stirling Engines (Stirling "convertors")
OK Tom, here goes. “If you want to run a Stirling engine off solar to produce electricity as a primary energy system it makes no sense IMO.” — I think you mean “P.V.” solar there and I totally agree, in fact it’s basic enough that I would probably leave off the “IMO.” “An electrical heating element ...
- Thu Dec 01, 2022 9:43 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: NASA Stirling Engines (Stirling "convertors")
- Replies: 42
- Views: 32202
Re: NASA Stirling Engines (Stirling "convertors")
Well Tom, like I said this could get fun. Once again as is your wont, you took an example out of context to argue for the sake of getting the last word or defeating the evil “anything that isn’t a hot air engine.” So - I repeat, energy used INSIDE YOUR HOUSE during the heating season for other purpo...