Search found 3123 matches

by Tom Booth
Sat Mar 23, 2024 9:13 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 132
Views: 8733

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

Well, it looks like teleportation of the 300 joules from inside to outside the engine, or... The same 300 joules exists BOTH inside and outside? Of course, after work and heat "rejection" the TEMPERATURE is 300°K inside and outside the engine. This is the problem with drawing an equivalenc...
by Tom Booth
Sat Mar 23, 2024 8:12 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 132
Views: 8733

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

Now, again, take a steam engine. The WATER we make the steam from is outside the engine. Let's say that water contains 300 joules per cylinder charge. We add 100 joules to boil the water to make steam under pressure. The steam is introduced to the cylinder. 50 joules work Now, this makes sense. The ...
by Tom Booth
Sat Mar 23, 2024 7:29 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The TRUTH? η = 1 – (Qc / Qh) = 1 – (Tc / Th)
Replies: 132
Views: 8733

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

M is the Mass of the gas inside the engine. Qcz = MCvTc applies to the energy in the engine's gas mass. It is such that Cv, specific heat coefficient of that gas, times the mass equals one. That is, one Joule per degree temperature increase for the entire volume/mass inside the engine. When the hea...
by Tom Booth
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: 8733

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"...
by Tom Booth
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: 8733

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 ...
by Tom Booth
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: 8733

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...
by Tom Booth
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: 8733

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...
by Tom Booth
Fri Mar 22, 2024 12:24 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: These things really are toys...
Replies: 26
Views: 361

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...
by Tom Booth
Thu Mar 21, 2024 9:49 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Lets beat up Carnot
Replies: 48
Views: 14855

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...
by Tom Booth
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: 8733

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...
by Tom Booth
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: 8733

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...
by Tom Booth
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: 8733

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...
by Tom Booth
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: 8733

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"...
by Tom Booth
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: 8733

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 ...
by Tom Booth
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: 8733

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 ...