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Re: [Phys-l] PV question

Perhaps if you narrowed your heat exchanger specification to a 100% efficient Peltier device, you could meet John M's specifications for a REVERSIBLE process.

But I don't think there's any such animal.

Brian W

Bernard Cleyet wrote:
In the cooler / heater, but not in the cylinder, no?


p.s. the v. large # of reservoirs, I think, only a "gedanken", while the heater and, or cooler is practical.

On 2010, Jan 23, , at 12:29, John Mallinckrodt wrote:

Bernard Cleyet wrote:

A PID controller with a heater or cooler of a single reservoir won't do?

John Mallinckrodt wrote:

(e.g., an isobaric or isochoric process), you will need a large number (technically, an infinite number) of reservoirs at different temperatures.
That could work to perform a reasonable approximation of a quasi- static process on the gas, but it wouldn't constitute even an attempt to perform a reversible process because heaters and coolers generate entropy by design.

John Mallinckrodt
Cal Poly Pomona