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Re: [Phys-L] Carnot (?) efficiency - Stirling diagram



Here's a Stirling diagram, which is quite practical to implement.

http://tinyurl.com/nm3m5bw

The yellow piston is a porous regenerator. using e.g
a compressed copper gauze piston.

Brian


On 3/5/2015 2:27 PM, brian whatcott wrote:


On 3/5/2015 11:14 AM, Carl Mungan wrote:
"For an ideal regenerator, it contributes
nothing to the energy budget and entropy budget when summed
over a cycle. Whatever it takes it gives back over the
course of a cycle."

That's very clever. I can see indeed that we could undo in the isochoric
depressurization what we did in the isochoric pressurization step, at least
for an ideal device.

Now what is such a device (I'll accept a real one and idealize it in my
mind), and why don't intro textbooks mention it given that this seems a
pretty essential part of non-Carnot cycles?


Isn't that the metallic gauze piston that sweeps the internal space of the cylinder of a Stirling, in turn heating and cooling the charge??

Brian Whatcott
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