Abstract
This paper deals with the calculation of the ambient conditions influence on combined cycle gas turbine (CCGT) power and efficiency. The main parameters influencing the CCGT performances when ambient conditions change are the air density and the steam condenser pressure. An 800 MW CCGT is studied in order to obtain numerical results in a particular case. This power plant is analyzed working with different condenser cooling techniques (direct or indirect cooling with open or closed circuits) at both 100% and 50% load. The results show that power output drops by 0.60% to 0.65% are to be expected for every 1 °C rise in ambient temperature and by 0.13% to 0.14% for every 1 mbar decrease in ambient pressure. The efficiencies are affected to a lesser extent since some of the gas turbine waste energy is recovered in the heat recovery steam generator and the steam turbine power is almost constant.
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