Search found 3274 matches

by Tom Booth
Wed Apr 24, 2024 11:41 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Isothermal Heat Transfer
Replies: 20
Views: 227

Re: Isothermal Heat Transfer

In that case, I'd say 70 units of heat would be "rejected" to the room. The rest going out as "work" is tied up as potential energy in the lifted weight. Ok, now were getting somewhere. Now how do we tie in the theory that there is a potential lowering of gas temperature and ref...
by Tom Booth
Wed Apr 24, 2024 10:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Isothermal Heat Transfer
Replies: 20
Views: 227

Re: Isothermal Heat Transfer

The engine is perfectly insulated so no heat is lost other than what is exhausted or rejected to the sink. The heat is supplied to the engine within the confines of an isolated chamber so as to not heat the room directly. The only thing heating the room is what is exhausted/rejected to the sink. In...
by Tom Booth
Wed Apr 24, 2024 9:42 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Why can't I "just buy" a stirling engine?
Replies: 35
Views: 8426

Re: Why can't I "just buy" a stirling engine?

Basically looks like the "hot" piston has been entirely replaced by a displacer, or perhaps regenerative displacer of some sort, but no longer an Alpha type piston.

Compress_20240424_124014_4623.jpg
Compress_20240424_124014_4623.jpg (31.93 KiB) Viewed 19 times
.
by Tom Booth
Wed Apr 24, 2024 8:01 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

The following is some improvements to the original post, not a direct Quote: Question: How does Qh an Qc become Q's all the way to Zero, and then, Th and Tc? Answer: . ... ...So Qhz should have the same relation ship to Qcz that DQh has to DQc, in other words, 'n' is the same. Basically this says t...
by Tom Booth
Wed Apr 24, 2024 7:13 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Why can't I "just buy" a stirling engine?
Replies: 35
Views: 8426

Re: Why can't I "just buy" a stirling engine?

I was trying to negotiate the purchase of one of those generators, maybe a couple years ago, or even be a US distributor. There was some trade import/export restriction of some sort, apparently, as I recall. Not sure or the nature of the issue or what country or countries imposed this. There seemed ...
by Tom Booth
Tue Apr 23, 2024 8:20 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Isothermal Heat Transfer
Replies: 20
Views: 227

Re: Isothermal Heat Transfer

... This is a fundamental issue that needs to be resolved here. With expansion towards BDC, the internal energy can remain constant while temperature lowers. Not in my opinion. Speaking generally, ("ideal gases") internal energy and kinetic energy are the same thing. The measure of kineti...
by Tom Booth
Tue Apr 23, 2024 3:35 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

I've got a new theory, without naming names.

Some forum members here might actually be a PHPbb forum extension

https://privet-fun.translate.goog/viewt ... r_pto=wapp
by Tom Booth
Tue Apr 23, 2024 1:46 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

Googles AI suggests the opposite of the results I obtained:
Resize_20240423_164400_0521.jpg
Resize_20240423_164400_0521.jpg (90.95 KiB) Viewed 25 times
by Tom Booth
Tue Apr 23, 2024 1:14 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

Anyway, the whole subject is full of so many contradictions and apparent nonsense and unresolved differences of opinion I decided I needed to do some experiments of my own to try and resolve some of the issues and questions. Like, run an engine on ice and measure the rate at which the ice melts. I r...
by Tom Booth
Tue Apr 23, 2024 12:42 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Isothermal Heat Transfer
Replies: 20
Views: 227

Re: Isothermal Heat Transfer

Compress_20240423_154122_2561.jpg
Compress_20240423_154122_2561.jpg (21.53 KiB) Viewed 18 times
Don't ask me.
by Tom Booth
Tue Apr 23, 2024 12:10 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Isothermal Heat Transfer
Replies: 20
Views: 227

Re: Isothermal Heat Transfer

Tom is proposing that heat energy disappears and the internal energy of the gas reduces after becoming mechanical motion. ... Is that accurate? Except that I don't consider "heat energy disappears" and "internal energy of the gas reduces" two separate. Operations. Heat going in ...
by Tom Booth
Tue Apr 23, 2024 9:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

Stroller wrote: Tue Apr 23, 2024 8:05 am
Conversely, performance of the drinking bird can be greatly enhanced by reducing ambient air pressure, as this vid demonstrates:

https://www.youtube.com/watch?v=LsijnzUK3iA
LOL...

The bird flipping over after being hit with the "duster" was hilarious.
by Tom Booth
Tue Apr 23, 2024 9:07 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

Is this lunacy "established science"? https://youtu.be/V3nNgygrmsI?si=r4K7VeLnT1otan-q What happens if you raise an objection? Maybe my little LTD could utilize 21% of the heat supplied. No, that would require going to absolute zero. Perpetual motion. You can be "absolutely certain th...
by Tom Booth
Tue Apr 23, 2024 8:34 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

Noted equation: Qhz-Qcz = DQh = DT• Cv•M (Noted equation) Where: DT = Delta T = Th-Tc M = Mass Cv = specific heat. ... There is, I think, a kind of paradox in this "noted equation" that could potentially cause all kinds of problems, errors, ambiguities etc. as it is incorporated and used ...
by Tom Booth
Tue Apr 23, 2024 7:14 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 344
Views: 11984

Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)

Nobody could build a Carnot engine so how could you ever "prove" it isn't "the most efficient engine possible". Well, after some thought, my reasoning was, If heat is, or isn't supposed to go through the engine and is or is not "converted" and all this is too difficult...