🚀 go-pugleaf

In article <38efju$8r9@uropax.contrib.de>, harti@uropax.contrib.de (Stefan Hartmann) writes:
> Via the retrograde condensation of the 2 gas mixtures it is possible to build a
> machine, that gets a positive area inside the Pressure/Volume diagram.
> You should know, how a Sterling motor works, to understand the principle.
> It is simular to a Sterling motor, but without needing the cold pole.
> So the heat does not have to flow from the hot pole to the cold pole
> to do mechanical work, but it just needs the hot pole as the energy input !
> 
> During expansion of the gas mixture inside the machine the gasmixture goes into
> this retrograde condensation, which leads to loose pressure.
> So if the compression takes place, it needs less mechanical energy to pull the
> piston back.
> When being back at the beginning, it just needs some heat energy to restart
> the process, thus it does not need a cold pole...
> 
> This machine looks like  a reciprocating engine, but just uses a gas-mixture
> of N2 and C4H10 or better N2 and CO2.
> 
> It just needs a heat source to operate and the temperature of the heat source
> is in the normal room temperature area, so about 20 to 50 degrees Celsius.
> It can be scaled to any other temperature by using different gas mixtures.

One small but painfully obvious question if this device doesn`t need a cold
reservoir or heat sink then why do you need a 'heat source' this touted engine 
should run at any temperature the construction materials can handle, eg immerse 
it in a  bath of cold water and it should still run forever.  Want to place a bet 
that it will?, I can always use the $$$.

All readers of this group would appreciate it if you could take the time to
look at the cycle rigorously and see where the energy is coming from and where
it is going to and what relative temperatures these sources and sinks are at and
also provide the efficiency of the engine so we can compare it with Carnot 
efficiency.

It may be (I can't tell from what's written) that this is simply a form of heat
regenerator which is an artifact of the working fluid rather than a mechanical
device.  Stirling Cycle engines can achieve Carnot efficiency if ideal 
regenerators are used.

From what has been said in this thread it is going to require some very hard
data before anyone with even a primitive understanding of thermodynamics is going 
to believe the claims that are being made.

Robert