Stirlingengineforum.com

... Somewhere someone made the claim that Stirling Engine expansion is "more adiabatic". I think that is misleading. https://en.m.wikipedia.org/w/index.php?title=Stirling_cycle&wprov=rarw1 "This article is about the adiabatic Stirling cycle. " Very misleading. Without heat g...

... 0k is only an advantage when a heat engine needs a heat sink which is what Tom is trying to circumvent. .... Not to be overly picayune, but I guess I'm overly sensitive about mischaracterizations. Anyway, again, I'm not "trying to circumvent" anything. Just trying to determine the fac...

I mean, this engine is ALL acrylic. Sides top, power cylinder, everything but the bottom hot heat input plate. It is sitting on a 100 Watt ceramic heating element. With all that heat, potentially going in at the bottom and nowhere else to go, the engine is running like a bat out of hell and just kep...

So next cycle. Again add heat at 400°K but if heat is not "rejected" our ∆T quickly diminishes. We have a bottleneck. After a few rotations the ∆T should get completely washed out. Well, what if ∆T doesn't matter? Suppose by "upgrading" the quality of Qcz DQh is less diluted? Sup...

Well, so far at least, the way I look at it is Qcz is like a reserve tank of gas that I don't have a key to unlock so can never use (so far as is generally recognized anyway) DQh however is high grade fuel put in at 400°K So there is this 4:3 ratio 300°K to 400°K I've supplied fresh fuel of the high...

I think I figured it out finally: Compress_20240421_122627_7772.jpg Drawing out a picture of the two "ratios" described, and adhering to the Carnot theory. The little rectangle in the upper left of the bottom right rectangle is the "work" or maximum heat input that can be convert...

... That allows us to look at the total energy in the system. So Qhz should have the same relation ship to Qcz that DQh has to DQc, ... I've been trying to work out what you might mean by this statement. "Qhz should have the same relation ship to Qcz that DQh has to DQc" First of all, why...

Even now, the smearing of his reputation continues:

http://www.douglas-self.com/MUSEUM/POWE ... uidair.htm

In regard to gas "contracting" at low temperatures, there is a very interesting description of air liquefaction: Compress_20240421_034139_9784.jpg Compress_20240421_034140_0149.jpg What's most interesting is the statement in the second clip, how once enough cold is established, compressing...

Fool wrote: ↑Fri Apr 19, 2024 10:17 am ...


Superposition is a mathematical and engineering tool that allows effects to be added up
....

Like my heat vector sum (alignment) thread.

... 100 Joules in 100 Joules of work out for an isothermal process only applies if the area under the curve goes to zero. ... I doubt you can actually back up that statement. Or what you mean, or are trying to imply I don't know. Do you suppose that if there is a compression stroke after an isother...

... I'm on Matt's side. Gas never contracts. .... Gas doesn't ever pull. ... I don't think "pulling" is often included in a definition of "contract". Some definitions from some online dictionaries: to cause to draw more closely together to reduce to smaller size by or as if by s...

You still pay the penalty of lugging around the extra weight of fuel. Cars are more efficient on the bottom 1/4 of a fuel tank, because the extra weight is missing. In a car fuel weight is not a big percentage of car weight. You won't see a big savings. It may not be worth the risk of running out, ...

... 400 J of energy converted to work on the forward stroke. 300 J getting back to the start. That sets the efficiency. I'll have look at how to post the letter Etta. Qcz is kind of a penalty cost of back work or compression. ... Another way of looking at it: 400 joules converted to work on the for...

Analogies or thought experiments are a dime a dozen. Which analogy comes closest to describing reality is the question. Ultimately resolved by observation/experimental outcome. I like to think of the car analogy as having a full tank of fuel and only burning the top 1/4 part of the tank, then refill...