Gas Turbine Papers by Umit Unver
The performance of a gas turbine is significantly affected by the environmental conditions. Net p... more The performance of a gas turbine is significantly affected by the environmental conditions. Net power output of a gas turbine can be increased by reducing the compressor inlet air temperature. There are different techniques used for inlet air cooling of the gas turbines. These techniques are evaporative coolers, spray inlet coolers or fogging systems, and mechanical refrigeration or chillers where a heat exchanger cools the inlet air. To improve the efficiency of gas turbine power plants, Ice Thermal Energy Storage (ITES) systems can be used as inlet cooling system.
The aim of this study is to determine the use of an ITES system for a 239 MW powered gas turbine cycle, which is located in Bursa / Turkey. The performance of the system was investigated for full load conditions. Energy and exergy analysis were done by using last decade’s meteorological weather data. The results showed that utilizing the ITES system boosted the net power up to 12.60 %.
The climate condition affects the performance of the combined-cycle power plants. The efficiency ... more The climate condition affects the performance of the combined-cycle power plants. The efficiency of the combined
cycle is significantly influenced by the temperature, pressure and humidity of the air. When the ambient air
temperature increases, the density of the air decreases, and it leads to a reduction of power generated by the gas
turbine. In this work, the energy and exergy analysis of a commercial gas turbine, with inlet air cooling, was
performed. The effects of fogging system on gas-turbine performance studied. For this aim, the energy and exergy
balances were obtained for each piece of equipment. Calculations have been made for four different cases for the
regarded gas turbine system. Furthermore, exergetic efficiency, exergy destruction rates and improvement
potentials were obtained, and the results of the study demonstrated graphically. It is concluded that the net power
output of the gas turbine system increased at lower inlet temperatures and exergy destruction rates occurred from
highest to lowest as combustion chamber (CC), gas turbine (GT) and air compressor (AC), respectively.
Gas turbines are widely used in the energy production. The quantity of the operating machines req... more Gas turbines are widely used in the energy production. The quantity of the operating machines requires a special attention for prediction of power production in the energy marketing sector. Thus, the aim of this paper is to support the sector by making the prediction of power production more computable. By using the data from an operating power plant, correlation and regression analysis are performed and linear equation obtained for calculating useful power production vs atmospheric air temperature and a novel method, the gas turbine degree day method, was developed. The method has been addressed for calculating the isolation related issues for buildings so far. But in this paper, it is utilized to predict the theoretical maximum power production of the gas turbines in various climates for the first time. The results indicated that the difference of annual energy production capacity between the best and the last province options was calculated to be 7500 MWh approximately .
Progress in Exergy, Energy, and the Environment, 2014
ABSTRACT Nowadays the focus of the power sector is on renewable energy sources. Even so, in Turke... more ABSTRACT 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.
The performance of a gas turbine is significantly affected by the environmental conditions. Net p... more The performance of a gas turbine is significantly affected by the environmental conditions. Net power output of a gas turbine can be increased by reducing the compressor inlet air temperature. There are different techniques used for inlet air cooling of the gas turbines. These techniques are evaporative coolers, spray inlet coolers or fogging systems, and mechanical refrigeration or chillers where a heat exchanger cools the inlet air. To improve the efficiency of gas turbine power plants, Ice Thermal Energy Storage (ITES) systems can be used as inlet cooling system. The aim of this study is to determine the use of an ITES system for a 239 MW powered gas turbine cycle, which is located in Bursa / Turkey. The performance of the system was investigated for full load conditions. Energy and exergy analysis were done by using last decade’s meteorological weather data. The results showed that utilizing the ITES system boosted the net power up to 12.60 %.
The climate condition affects the performance of the combined-cycle power plants. The efficiency ... more The climate condition affects the performance of the combined-cycle power plants. The efficiency of the combined cycle is significantly influenced by the temperature, pressure and humidity of the air. When the ambient air temperature increases, the density of the air decreases, and it leads to a reduction of power generated by the gas turbine. In this work, the energy and exergy analysis of a commercial gas turbine, with inlet air cooling, was performed. The effects of fogging system on gas-turbine performance studied. For this aim, the energy and exergy balances were obtained for each piece of equipment. Calculations have been made for four different cases for the regarded gas turbine system. Furthermore, exergetic efficiency, exergy destruction rates and improvement potentials were obtained, and the results of the study demonstrated graphically. It is concluded that the net power output of the gas turbine system increased at lower inlet temperatures and exergy destruction rates oc...
The Role of Exergy in Energy and the Environment, 2018
The Republic of Turkey’s current energy policy encourages households, industries, and energy prod... more The Republic of Turkey’s current energy policy encourages households, industries, and energy production facilities to be energy wise. In this chapter, the Bursa Ovaakca power plant, which is one of the largest power plants of Turkey, was investigated with regard to boosting production. The scope of this chapter was to design a solar-assisted absorption cooling plant for cooling the intake air of gas turbines. The aim of this chapter is to achieve an efficiency augmentation in gas turbines through a solar energy-assisted absorption cooling system. The COP of the designed absorption cooling system has been calculated to be 0.75, and the utilization factor is 28.6.
Thermal Science, 2018
Gas turbines are widely used in the energy production. The quantity of the operating machines req... more Gas turbines are widely used in the energy production. The quantity of the operating machines requires a special attention for prediction of power production in the energy marketing sector. Thus, the aim of this paper is to support the sector by making the prediction of power production more computable. By using the data from an operating power plant, correlation and regression analysis are performed and linear equation obtained for calculating useful power production vs atmospheric air temperature and a novel method, the gas turbine degree day method, was developed. The method has been addressed for calculating the isolation related issues for buildings so far. But in this paper, it is utilized to predict the theoretical maximum power production of the gas turbines in various climates for the first time. The results indicated that the difference of annual energy production capacity between the best and the last province options was calculated to be 7500 MWh approximately.
Thermal Science, 2018
Gas turbines are widely used in the energy production. The quantity of the operating machines req... more Gas turbines are widely used in the energy production. The quantity of the operating machines requires a special attention for prediction of power production in the energy marketing sector. Thus, the aim of this paper is to support the sector by making the prediction of power production more computable. By using the data from an operating power plant, correlation and regression analysis are performed and linear equation obtained for calculating useful power production vs atmospheric air temperature and a novel method, the gas turbine degree day method, was developed. The method has been addressed for calculating the isolation related issues for buildings so far. But in this paper, it is utilized to predict the theoretical maximum power production of the gas turbines in various climates for the first time. The results indicated that the difference of annual energy production capacity between the best and the last province options was calculated to be 7500 MWh approximately.
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Gas Turbine Papers by Umit Unver
The aim of this study is to determine the use of an ITES system for a 239 MW powered gas turbine cycle, which is located in Bursa / Turkey. The performance of the system was investigated for full load conditions. Energy and exergy analysis were done by using last decade’s meteorological weather data. The results showed that utilizing the ITES system boosted the net power up to 12.60 %.
cycle is significantly influenced by the temperature, pressure and humidity of the air. When the ambient air
temperature increases, the density of the air decreases, and it leads to a reduction of power generated by the gas
turbine. In this work, the energy and exergy analysis of a commercial gas turbine, with inlet air cooling, was
performed. The effects of fogging system on gas-turbine performance studied. For this aim, the energy and exergy
balances were obtained for each piece of equipment. Calculations have been made for four different cases for the
regarded gas turbine system. Furthermore, exergetic efficiency, exergy destruction rates and improvement
potentials were obtained, and the results of the study demonstrated graphically. It is concluded that the net power
output of the gas turbine system increased at lower inlet temperatures and exergy destruction rates occurred from
highest to lowest as combustion chamber (CC), gas turbine (GT) and air compressor (AC), respectively.