Stirlingengineforum.com

TK motors has some DIY small motors that are quite interesting.
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https://m.youtube.com/@tkmotors991/videos

Steam engines are easier but require constant attention baby sitting the boiler.

Pause the video at 8:05 and inspect the coils. The smaller tube is completely frosted up. Weird. The larger coil has hot and cold spots signifying uneven cooling. How is that accomplished on a heat conductive copper pipe with claimed even cooling happening inside. It's a fake. Why was the video stop...

Actually, no, it doesn't. Evaporative cooling requires mass removal. Evaporative cooling requires air flow to carry the water away. The mass carries away the heat. Neither are happening inside that system. The vapour compression cycle requires a pressure difference between boiling, and condensation....

Fine. Since you and ipoo know so much more about refrigeration than anyone else go ahead and make one. Let us know how that works out for you. I just have one more question, how does ipoo get -32 degrees C out of a chemical that boils at 10 degrees F, in a system that is running at atmospheric press...

Here is a real DIY refrigerator. It has an explanation for temperature drop verses orifice. Ten feet of 1 mm tube for a larger pump. Those little butane ones need a much much smaller hole or longer capillary, and even then unlikely to get claimed temperature drop at all. https://m.youtube.com/watch?...

Stroller,

VincentG's finger will absorb negligible heat. You described a isentropic process. Only one mass, the internal gas.

Where is the orifice?

No. Those butane quack conglomerations are no where near optimize and so badly designed they don't even work. They have a lower than zero, or negative, efficiency. They burn up energy and produce zero temperature drop.

Could you point out a time when the orifice was installed, and a brief description. I certainly could have missed it. However, that is not the only problem. And claiming I don't know, when you can't provide any data is certainly not helping. I watched several. I saw nothing that was even close to th...

Unless, of course, you don't understand how it works. Then it might seem like it. Tom, you constantly, change the subject from some scientific point, "no orifice", to an attack on the person, "Pretty obviously he doesn't recognize common refrigeration components, even while watching ...

Tom, if they were more efficient than a Joule Thompson refrigerator, wouldn't they all use them? Solid state, freon less, noiseless. No they are less efficient. https://www.rigidhvac.com/blog/compressor-based-cooler-vs-thermoelectric-cooling-peltier https://en.m.wikipedia.org/wiki/Thermoelectric_coo...

Duh!

How is Stroller's "opinion" any different from other posters here. Answer, science. He is using science.

Take a bicycle pump, extend it, and block the outlet orifice with your finger. Push the pump handle in and feel the warmth on your finger where it covers the outlet orifice as the air is compressed. That's kinetic energy being converted to heat. No let go of the pump handle. It is forced outwards b...

Tom Booth wrote:Well, I'm undecided, personally. Just because something can be faked doesn't necessarily mean that it is in all cases.

As James Randi said, of course, but, the explanation of how to fake it is probably more likely than the explanation that it works by magic.