Performance Estimation of Gas Turbine System via Degree-Day Method (original) (raw)

Progress in Exergy, Energy, and the Environment 2014, pp 553-558

Nowadays the focus of the power sector is on renewable energy sources. Even so, in Turkey, the most preferred power plants are still co-generation power plants. Considering installed power, gas turbine power plants are the most used type. In gas turbine power cycles, both power and efficiency are highly affected by atmospheric temperature. In this study, the degree-day method is used to expose the variation of the electric power of a gas turbine with respect to atmospheric conditions. The installed capacity of the gas turbine is 237 MW. The operating data were supplied by Ovaakça Power Plant Administration of Bursa/Turkey. In this paper it is indicated that, for a 45 °C increment of atmospheric temperature, mass flow through the compressor at a unit time decreases by about 85.2 kg. Therefore, the compression work decreased by about 11.45 %. In addition, by means of the atmospheric temperature increment, both the total energy input via natural gas and intake airflow rate were decreased by 17.1 % and this resulted in a reduction in net electric power production.