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Old 11-28-2017, 12:23 PM   #41 (permalink)
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Quote:
Originally Posted by Wikipedia
The simple machine, consisting of a tiny paddle wheel and a ratchet, appears to be an example of a Maxwell's demon, able to extract useful work from random fluctuations (heat) in a system at thermal equilibrium in violation of the second law of thermodynamics.
An [non-theoretical] example of a Maxwell's demon, theRanque-Hilsch vortex tube:

https://en.wikipedia.org/wiki/Vortex_tube

Separation of a compressed gas into a hot stream and a cold stream

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Old 11-28-2017, 04:08 PM   #42 (permalink)
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That is so 1933!
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Old 11-28-2017, 04:19 PM   #43 (permalink)
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NSTAAFL, and they're noisy to boot.
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Old 11-28-2017, 04:43 PM   #44 (permalink)
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They are also less efficient than conventional refrigeration, which is not known for its efficiency.
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Old 11-28-2017, 05:25 PM   #45 (permalink)
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Quote:
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They are also less efficient than conventional refrigeration, which is not known for its efficiency.
Not energy efficient in the strict sense. But simple and small.

Good for cooling off electrical panels where you have no other room for equipment, and where compressed air is available.

Unfortunately compressed air is expensive AND inefficient. Combine that with cooling inefficiency ... and it's ... umm .. pathetic? efficiency. BUT it works.
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Old 11-28-2017, 09:20 PM   #46 (permalink)
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Assume bottomless compressed air from wind or tidal power. Presume a cascade of vortex tubes, attached by their hot sides and sized in a Pythagorean ratio of 2:8/5:4/3:1. A hot musical chord.
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Old 11-28-2017, 11:10 PM   #47 (permalink)
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Assume an airplane in flight, traveling at 585 mph, using outside "ramair" to create the air-pressure stream...

Already in use in passenger & cargo planes.
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Old 11-29-2017, 12:02 AM   #48 (permalink)
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That sounds like that NASA plane with turbines to power electric fans.

I do not believe that is how windmills work.
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Old 11-29-2017, 11:37 AM   #49 (permalink)
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T'other way 'round, the Ram Air Turbine:

https://en.wikipedia.org/wiki/Ram_air_turbine

It's like putting a propeller on your bullet-nose Studebaker.

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