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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: