Search found 3277 matches
- Wed Apr 24, 2024 4:15 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
Re: Isothermal Heat Transfer
I mean, we are only talking about a piston returning to TDC after being pushed "up hill" against 1 atmosphere. Similar to lifting a weight against gravity or winding a spring. If it is "harder" to lift a heavier weight, the equivalent is still stored as "potential energy&quo...
- Wed Apr 24, 2024 3:03 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
- Wed Apr 24, 2024 2:52 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
Re: Isothermal Heat Transfer
I mean, in principle. If you store "potential energy" in a bolder, by rolling it up a hill, it can then roll down. I don't think this is any different then driving out a piston "up hill" against atmospheric pressure. It can then return. But what happens when the bolder reaches th...
- Wed Apr 24, 2024 11:41 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
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...
- Wed Apr 24, 2024 10:19 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
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...
- 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: 8443
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.
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- 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: 11997
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...
- 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: 8443
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 ...
- Tue Apr 23, 2024 8:20 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
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...
- 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: 11997
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
Some forum members here might actually be a PHPbb forum extension
https://privet-fun.translate.goog/viewt ... r_pto=wapp
- 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: 11997
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Googles AI suggests the opposite of the results I obtained:
- 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: 11997
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...
- Tue Apr 23, 2024 12:42 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
Re: Isothermal Heat Transfer
Don't ask me.
- Tue Apr 23, 2024 12:10 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Isothermal Heat Transfer
- Replies: 24
- Views: 244
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 ...
- 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: 11997
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
LOL...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
The bird flipping over after being hit with the "duster" was hilarious.