2.2 Gas cycle
In currently technology of GT the polytropic efficiency of compressor and turbine are about 0.9 [33], which is considered constant during calculations. The mechanical and electrical efficiency are in-between 97-99 % and of combustion chamber is about 98 % [34]. Typical value of pressure drop in combustion chamber and HRSG are 2 - 6 % [35] and for filtration 0.005 - 0.015 bar [36]. The specific heat of air in compressor and gases in turbine section correspond to polynomial regressions with constants obtained from [37]. The outlet temperatures from compressor and turbine are obtained from isentropic efficiency via polytropic efficiency and pressure ratio/ expansion ratio.
The work of the turbine is summed from\(\ \) works of expansion gases and cooling air [33], [34], [38]. The net power of GT is the difference between that produced by the turbine and consumed by the compressor.