6912856 B2 abstract a method for determining a target exhaust temperature for a gas turbine including determining a target exhaust temperature based on a compressor pressure condition determining a temperature adjustment to the target exhaust temperature based on at least one parameter of a group of parameters consisting of specific humidity compressor inlet pressure loss and turbine exhaust back pressure and adjusting the target exhaust temperature by applying the temperature adjustment application_number US 60033503 A description fig1 depicts a gas turbine 10 having a compressor 12 combustor 14 turbine 16 drivingly coupled to the compressor and a control system 18 an inlet 20 to the compressor feeds ambient air and possibly injected water to the compressor the inlet may have ducts filters screens and sound absorbing devices that each may contribute to a pressure loss of ambient air flowing through the inlet 20 into the inlet guide vanes 21 of the compressor an exhaust duct 22 for the turbine directs combustion gases from the outlet of the turbine through ducts having for example emission control and sound absorbing devices the exhaust duct 22 applies a back pressure to the turbine the amount of back pressure may vary over time due to the addition of components to the duct 22 and to dust and dirt clogging the exhaust passages the turbine may drive a generator 24 that produces electrical power the inlet loss to the compressor and the turbine exhaust pressure losses tend to be a function of corrected flow.