Please help! How to calculate these? A combined cycle process powered by natural gas is used to generate electricity. Air enters the gas turbine compressor at $1$ bar, $20$C$,$ and is compressed to $16$ bar, $435$C$.$ The turbine inlet conditions are $16$ bar and $1300$C$.$ Exhaust gases expand in the turbine, causing the pressure to drop to $1$ bar. The exhaust gases pass after that through the heat recovery boiler $($abbreviation in English HRSG$)$ and finally exit at $110$C in temperature. $15$ kg$/$s of steam is fed to the steam cycle turbine at a temperature of $550$C$,$ and it expands to the condenser pressure of $8$ kPa, so the steam mass fraction is $0\mathrm{.}865.$ Steam cycle produces electricity of $20$ MW $($gross$).$ The minimum temperature difference in the heat recovery boiler is $$Tmin $=10$C$.$ Assume that Cp$,$air$=1\mathrm{.}005$ kJ$/($kg$$K$)$ and k $=1\mathrm{.}4.$ The effects of natural gas and the pump can ignore. Specify: $1\mathrm{.}1$ schematic diagram and T$-$s diagram of the whole process $($draft$,$ no need to be exact$)$; $1\mathrm{.}2$ compressor isentropic efficiency; $1\mathrm{.}3$ steam turbine inlet pressure; $1\mathrm{.}4$ air mass flow; $1\mathrm{.}5$ Brayton cycle turbine isentropic efficiency; $1\mathrm{.}6$ electrical efficiency of the combined power plant.