Analysis and optimisation of combined cycles gas turbines working with partial recuperation

Results show the convenience of using recuperative gas turbines for the dual pressure configurations and, especially, the use of partial recuperation for both dual and triple pressure configurations. In almost all cases the optimal recuperative mass fraction is located at roughly 90%. In dual pressure level heat recovery steam generators, the use of a recuperative gas turbine is advisable both from the thermodynamic and economical points of view, but results are improved using high partial recuperation. In triple pressure level configurations, fully-recuperative gas turbines are not advisable but the performance and cost may be enhanced if the gas turbine is partially recuperative.