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.