Search found 3120 matches
- Sat Mar 23, 2024 3:35 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Tom, I really admire your patience with this "Fool". But like Don Quixote, it is . . . . In my (practical) world, efficiency is the relation between what you put in, versus what you get out. Please, read again : What YOU put in ! So if the input is 1 Kelvin, where does "the rest"...
- Sat Mar 23, 2024 2:59 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
OK, much better. So far then, with that little glitch ironed out we have the typical heat/work diagram. heat-work-100.jpg What we know is (using the diagram's variables) Th = 400°K Tc = 300°K Qh = 100 joules We don't yet know the work output therefore We don't know Qc Though I'm pretty sure this is ...
- Fri Mar 22, 2024 6:38 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Taking a steam engine or turbine, where you have actual MASS flow through the engine, then yes, I"d say of course ALL the "internal energy" included in that mass is drawn or flows into and through (and back out of) the steam engine or turbine. With an external combustion Stirling engi...
- Fri Mar 22, 2024 3:06 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Question: How does Qh an Qc become Q's all the way to Zero, and then, Th and Tc? Answer: Let Th be the temperature of the hot plate/reservoir. Let Tc be the temperature of the cold plate. Let Qh be Delta Qh = DQh, the same definition and value, the heat added per cycle. Qc then becomes DQc the heat...
- Fri Mar 22, 2024 12:24 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: These things really are toys...
- Replies: 26
- Views: 343
Re: These things really are toys...
If I understand you, you are saying that with a hot side at 1,200°K (∆T 880°k) there should be an expansion from 2.6cc to 9.8cc but the actual expansion is only to 3.1cc Which is what might be expected if the ∆T were only 80°K rather than 880°K Is that right? I think this relates to what I have been...
- Thu Mar 21, 2024 9:49 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14849
Re: Lets beat up Carnot
Quote : "I've done a lot of experiments trying to run a Stirling engine on ice, with ice on the bottom. I was very surprised and puzzled to find that this did not work very well." I am sure, that I have read somewhere, that Sterling constructed his engine with the power-piston on the cold...
- Thu Mar 21, 2024 5:10 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Qcz is the internal energy of the mass of gas that is in the engine. It is equivalent to heat that would be added if heating that mass from zero K to Tc K. It is also the amount of heat energy that would come out if cooled from Tc to zero Kelvin. It is automatically supplied by the ambient temperat...
- Wed Mar 20, 2024 7:27 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Qhz will become the heat added to get to Qcz plus the extra heat added or DQh to get to Th Same issue, though this seems to be making less and less sense as things progress. How do you figure heat being "added" in order to "get to" Qcz. Qcz you defined as "The heat rejected...
- Wed Mar 20, 2024 6:53 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Question: How does Qh an Qc become Q's all the way to Zero, and then, Th and Tc? Answer: Let Th be the temperature of the hot plate/reservoir. Let Tc be the temperature of the cold plate. Let Qh be Delta Qh = DQh, the same definition and value, the heat added per cycle. Qc then becomes DQc the heat...
- Wed Mar 20, 2024 5:18 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Tom, I really admire your patience with this "Fool". But like Don Quixote, it is . . . . In my (practical) world, efficiency is the relation between what you put in, versus what you get out. Please, read again : What YOU put in ! So if the input is 1 Kelvin, where does "the rest"...
- Wed Mar 20, 2024 2:32 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Watch this folks, I just put 800 joules INTO the hat, now to get that 800 joules back out to transform it into work, I need to remove FOUR THOUSAND Joules to bring the temperature all the way down to ABSOLUTE ZERO!!! That's not how it works. If you start at zero Kelvin, and add 800 Joules, you can ...
- Wed Mar 20, 2024 12:17 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Watch this folks, I just put 800 joules INTO the hat, now to get that 800 joules back out to transform it into work, I need to remove FOUR THOUSAND Joules to bring the temperature all the way down to ABSOLUTE ZERO!!! That's not how it works. If you start at zero Kelvin, and add 800 Joules, you can ...
- Wed Mar 20, 2024 9:48 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
- Replies: 132
- Views: 8704
Re: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Question: How does Qh an Qc become Q's all the way to Zero, and then, Th and Tc? Answer: .... About twenty paragraphs of equations later I hope this is enough said about the Carnot Theorem. :eyeroll: Sorry, but I'll have to wait until I have a few hours to go through that whole tangled mess of math...
- Wed Mar 20, 2024 8:07 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Lets beat up Carnot
- Replies: 48
- Views: 14849
Re: Lets beat up Carnot
I look at heat as a continuous flow of energy. Trying to stop, convert, or alter it is like fighting the flow of a river. Instead, extracting energy while maintaining the flow is how I see it. In that respect, heat rejection to the sink is part of maintaining that flow. Well, you've stated the argu...
- Tue Mar 19, 2024 3:38 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Modified "Hot" Beta engine
- Replies: 146
- Views: 25539
Re: Modified "Hot" Beta engine
Do we at least agree, without reservation that SOME heat is converted to work (mechanical motion) in a heat engine? Then even an engine that has purely adiabatic expansion and contraction is excuting some mechanical motion not represented as work on the PV diagram. Let's take a single increment of e...