Abstract: The power optimization for a real closed intercooled regenerated gas turbine (Brayton) cycle coupled to variable-temperature heat reservoirs is studied by using finite-time thermodynamics. In the analysis, the irreversibilities involve the heat resistance in four heat exchangers (the hot- and cold-side heat exchangers, the regenerator and the intercooler), the irreversible compression and expansion losses in the compressor and the turbine, and the pressure losses in the piping are taken into account. The optimal intercooling pressure ratio and the heat conductance distributions among the four heat exchangers at the maximum power are obtained by detailed numerical examples. Double maximum power is obtained by optimizing the total pressure ratio. Finally, the heat capacity ratio between working fluid and heat reservoir is also optimized for the thrice-maximum power.

Key words: Finite-time thermodynamic, Gas turbine cycle, Intercooled, Power optimization, Regenerated