Properties of gases

If you insert References on this cloud functions of the thermodynamic properties of gasaes

http://twt.mpei.ac.ru/rbtpp/Gas/M15/wspg.xmcdz

and water and/or steam

http://twt.mpei.ac.ru/rbtpp/MC-WSP/M15/wsp.xmcdz

you can calculate for example the thermal efficiency of the ideal Combined cycle: Rankine cycle (steam turbine) + Brayton cycle (gas turbine)

Try also please this on-line calculation on Mathcad Server: http://twt.mpei.ac.ru/MCS/Worksheets/PTU/Web-Function-PGU-en.xmcd

and see the picture: