Brayton cycle of Typical New Plant

[Tatiana Dickinson]

Hi, I am trying to understand the thermodynamic cycle that the IECM uses in its Typical New Plant setting, and have discovered that the turbine back pressure is lower than ambient air pressure quite significantly. I thought that turbine back pressure/exit pressure should always be higher than atmospheric pressure to provide a positive pressure on the flue gas exiting the turbine, as per your IECM 12.0 beta User Manual? Thank you.