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    First- and second-law thermodynamic analyses of a combined natural gas cycle power plant: Sankey and Grossman diagrams
    (Tubitak Scientific & Technological Research Council Turkey, 2019) Karaagac, Mehmet Onur; Kabul, Ahmet; Ogul, Hasan
    The natural gas combined cycle power plant is one of the best options for generating electricity due to its use of low carbon fuels, high efficiency, and operational flexibility. These plants consist of a combination of Brayton and Rankine cycles, and investigation of these cycles is performed in this paper. Here the parameters of pressure and temperature used in the calculations are taken from a combined cycle power plant. The net power output of the system at 25 degrees C ambient temperature and 101.325 kPa pressure was calculated as 45 and 12 MW for Brayton and Rankine cycles, respectively. In addition, Brayton, Rankine, and combined cycle efficiencies were calculated as 37.5%, 27%, and 47.5%, while the exergy efficiencies were determined as 36%, 44%, and 46%, respectively. In the system elements, the most energy was lost in the combustion chamber and the highest exergy efficiency was achieved in the compressor at 95% level. Impacts of an increase in ambient temperature, compressor pressure ratio, and change on turbine inlet temperature were further investigated. Energy (Sankey) and exergy (Grossman) flow diagrams were further drawn based on the analyses obtained from the combined cycle power plants.
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    Öğe
    Kombine Doğalgaz Çevrim Santralinin Performans Analizi
    (2019) Karaağaç, Mehmet Onur; Kabul, Ahmet; Yiğit, Fatih
    Bu çalışmada, doğal gaz yakıtlı gerçek bir kombine çevrim santralinin verileri kullanılarak termodinamiğin birinci yasa analizi uygulanmıştır. Sistemin 25 °C çevre sıcaklığı ve 101.325 kPa basınçta net güç çıktıları Brayton çevrimi ve Rankine çevrimi için sırasıyla 45 MW ve 12MW olarak hesaplanmış ve değişen çevre koşullarının sistem üzerindeki etkisi incelenmiştir. Gaz türbininin ortalama % 38 verime ve kombine çevrimin ise % 48 verime sahip olduğu hesaplanmıştır. Çevre sıcaklığının 45 °C’lik artışı sistemin net gücünde % 22’lik bir azalmaya neden olurken kompresör kısmında sıkıştırma işi için gereken güç de artmıştır. Çevre sıcaklığının artmasıyla kompresöre giren hava debisinin azaldığı bunun doğrultusunda özgül yakıt sarfiyatında da %20 azalma olduğu görülmüştür. Çevre sıcaklığının kombine çevrim santraline de doğrudan bir etkisinin olduğu ortaya konmuştur.
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    Öğe
    Performance Analysis of Natural Gas Combined Cycle Power Plant
    (Gazi Univ, 2019) Karaagac, Mehmet Onur; Kabul, Ahmet; Yigit, Fatih
    In this study, the first law analysis of the thermodynamics was applied using the data of a real gas-fired combined cycle power plant. The net power outputs of the system are calculated for the Brayton cycle and Rankine cycle as 48 MW and 12 MW respectively and the effect of changing environmental conditions on the system was examined. It is calculated that the gas turbine has an average efficiency of 38% and the combined cycle has 48% efficiency. With an increase in ambient temperature of 45 degrees C, the system has 22% reduction in net power, while the power required for compression in the compressor section has also increased. As the ambient temperature increased, there was a 20% reduction in specific fuel consumption in the direction of the decrease in air flow entering to the compressor. It has also been revealed that, the environmental temperature has a direct effect on the combined cycle power plant.