Stirlingengineforum.com

-32°C with a 9 volt battery?

https://youtu.be/26uq_qHKRjU

I think I'd have to see it to believe it.

The guy does seem to understand air conditioning systems though.

The power supply to run that little freezer was allegedly, just 2A Compress_20240514_164949_9056.jpg 24 watts for an alleged nearly instant -30°C in open air. I guess I'm probably wrong, but that doesn't seem like that high of a bar for a small Stirling engine. 4 watts from this setup: https://youtu...

... Instead, re-framing "100%" efficiency seems more productive imo. The problem I have with the "Carnot Limit" calculation is that it "reframes" efficiency within its own definition of efficiency. First you add say 1,000 joules or whatever. Any sane reckoning of effic...

Tom, The "absolute zero" thing is a core part of the definition of efficiency for a fuel-powered engine - if the exhaust is at any temperature above absolute zero then there is energy being wasted. It's a particularly poor definition for Stirlings, with the many possible energy sources, b...

Good stuff. The fact is that anyone, myself included, trying to beat Carnot is going to have to present rigorous testing and all inclusive data to back up the claim, and that's just to get taken seriously in the first place. Then comes the naysayers and all the rest. Not really. Nobody cares a lick...

As far as I can tell, this video appears to be legitimate. https://youtu.be/g5uFyf9_1GM At least the simple refrigeration system appears to be constructed using conventional refrigeration system principles. The question is, could the cold produced be used to operate a Stirling engine on the surround...

Entropy. The thermodynamics definition boils down to: S = ∆Q/T ... The equation appears to be incorrect, or at least there is some debate about it: One person says the correct form of the equation is: ∆S = Q/T Another says: ∆S = ∆Q/T Someone else: T∆S = ∆Q https://www.quora.com/How-was-the-entropy-...

Temperature is a measure of the average kinetic energy of the particles in a sample of matter, expressed in terms of units or degrees designated on a standard scale. So, kinetic energy transferred to the thermometer bulb. But Joules are also representative of energy transfer. So this is all about e...

Entropy. The thermodynamics definition boils down to: S = ∆Q/T Energy transfered, Joules, divided by Temperature, Kelvin. Both being real values therefore, Entropy S is a real concept and value, too. ... Not necessarily 2 hamsters / 2 cups of milk = 1 Milkster. 7 dinosaurs x 3 grapefruits = 21 grap...

Just arrived:

Not sure what your saying, but my point was basically that the gas is compressed making it hotter. Expanded making it colder. Work is taken out making it colder, work put in making it hotter. Even without a displacer, these events take place at different times changing the state of the working fluid...

"thermal-to-electrical" efficiency includes, presumably, conversion loses, mechanical transmission loses, and depends at least in part on the generator efficiency? Admittedly the "overall system efficiency" of even a 100% efficient engine would be very low for a coal fired plant ...

Wow, I just checked. It looks like the two Kontax engines will be delivered today!

Atmospheric pressure across the entire globe varies very little from 14.7 psi Good point. However that is exactly why we have wind - air mass "moving itself" in order to equalise _pressure_ differences caused (largely/entirely?) by temperature differences. Which rather brings me back to t...

A little strange the three "real world" examples chosen are antiquated steam power stations West Thurrock station built in 1957 was decommissioned in 1993 Candu Nuclear Station built between 1950-60 Larderello dubbed "Oldest geothermal power plant in the world" operational since ...