kamil

yes. thanks for sparing time to me and your patient

with high spesific heat it's possible.

We define losses as pV in thermodynamic. So small volume is more pactical.

Q= m C (Th-Tc) = p V C ..... increase of spesific heat cause increasing of heat transfer. Also it related with volume. It seperated as Cp and Cv. Stable pressure or stable volume.

friction , heat transfer with enviroment , unstable compression and expansion etc... Heat transfer can be reduced with isolation. Friction depend on many things. Viscosity , pipes surface , pipes cross section etc... But i don't understand why they are important for choosing external source.

basicly (Qhot - Qcold)/Qhot In my opinion In theoretically; if we assumed that system are reversible than this formula become 1-(Tc/Th) so all of them have same efficiency at this circumstance. Am i right ? in pratically ; reversible systems are not exist. So efficiencies are different for each source. But all of them are same temperature range. That's why i'm thinking spesific heat are related with efficiency. İ don't know its right or wrong

There are 3 alternatives of heat source. Thoose external source supplies heat for closed cycle system. * At the 200 C air as an hot source and 20 C air as cold one. * 200 C steam and 20 C water * 200 C soduim solution and 20 C solid sodium Which one should be choosed for generate power with higher efficiency. Explain theese theoretically and pratically. How can i explain this ? I think it's related with spesific heat but i couldn't explain.