An Optimum Design Method for Steam Cooled Combined Cycle

The combined cycle system becomes more complex in accordance with the gas turbine firing temperature. Recently, the steam cooled combined cycle was proposed as one of the advanced combined cycle, which was expected over 52 % (HHV) thermal efficiency. These types of combined cycle have many design parameters. And the optimum design method is necessary to determine such many parameters effectively. This paper presents an optimum design method for combined cycle, using non-linear programming. The calculation results show the method can be applied to the investigation of steam cooled combined cycle and it can be also useful for the effective design of the combined cycle. The results also propose an optimum system which is robust for various gas turbine design conditions.