quentron.com

[MarkE]

@mark E i can summerise the whole process like this: work isnt needed by the system to  spontaneously compress gas.a spontaneous heat-sink is needed.

I never considered that there is such a thing as thermal reservoir in some state popping into existence.  That sounds kind of scary.  What would prevent a large reservoir popping up that is at a considerable different temperature than my body at some inconvenient moment?  I don't like the idea that I might instantly evaporate or freeze solid on the whim of some capricious heat sink.

If we stick to one subject to the point of resolution or impasse: Do we agree or disagree on what constitutes thermodynamic reversibility?  I can offer plenty of citations that thermodynamic reversibility requires that a system be able to traverse either way between two states without external energy input.   If you are familiar with a different definition and are relying upon that, then let's get the definition resolved.

[profitis]

@mark E you asked me if there was consumption of external energy during recharge phase when a compressed gas is released.what happens when we compress a gas in a cylinder then release it? Heat energy flows in from the environment not so? You didnt ask me if work was required by us to recharge the cell which is what im trying to explain here. We can compress a gas in a cylinder and release it a million cycles over,but not spontaneously.its a pretty reversable process but not spontaneously.if your talking about THERMODYNAMIC reversability then sure i can answer with a yes.the whole karpen cycle is perfectly reversable.100% of heat absorbed is converted to work.the nernst equation says nothing about kelvin statement @mark E but i think the confusion here is about its use to describe deviations from standard reversability of electrode potentials with concentration changes,the foundation of concentration cells.

[profitis]

@mark E a perfect thermodynamic reversability and heat sink will always pop up into existence in any system that has at least 2 assymetric entropy states like a quenco for example: on mode= equalization of electrochemical potential.off mode= redistribution of electron gas charge.

[MarkE]

@mark E a perfect thermodynamic reversability and heat sink will always pop up into existence in any system that has at least 2 assymetric entropy states like a quenco for example: on mode= equalization of electrochemical potential.off mode= redistribution of electron gas charge.

Profitis, I am sorry but I cannot parse that sentence into anything meaningful and true.

Reversibility or non-reversibility is a an intrinsic quality of a system.  Reversibility is not a property that can be dynamically changed.

Heat sinks are reservoirs.

I do not know of any things that have "2 assymetric (sic) entropy states", including the claimed Quenco device. Quencos have so far never worked. 

I think we are getting further and further from reality here.

[profitis]

ok @mark E lets rather deal with something that is claimed to exist by established sources e.g. wikipedia.perhaps if i ask you a few questions then there,l be less confusion for everyone.can you tell me how an oxygen electrode concentration cell will reach equilibrium spontaneously? Im talking about 2 platinum oxygen electrodes in same electrolyte with different exposure to gas in a closed system here.