Yazar "Utlu, Z." seçeneğine göre listele

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    Advanced exergy analysis of cryogenic liquefaction system
    (Institute of Thermal Technology, 2019) Karabuga, A.; Utlu, Z.; Selbas, R.
    The elements in the air are separated by different methods and these elements are basically liquefied by three different methods (cryogenic, pressure swing adsorption and membrane). In this study, advanced exergy analysis of the nitrogen liquefaction unit was performed using the cryogenic liquefaction method. Advanced exergy analysis consists of four different splitting. These; endogenous/exogenous and avoidable/unavoidable exergy destruction. In the study, forward exergy analysis was performed for each component and endogenous, exogenous, unavoidable and avoidable values of these components were calculated. In the result of the study, the highest endogenous exergy degradation was found in the CM1 compressor with 32.56 kW, the highest exogenous exergy destruction was in the HE3 heat exchanger with 25.8 kW, the highest unavoidable exergy destruction was in the CM1 compressor with 22.55 kW and the highest avoidable value was in the HE1 heat exchanger with a value of 17.76 kW. Total exergy destruction of system were calculated as 755.08 kW. © ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. All rights reserved.
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    Assessment of occupational health and safety issues in geothermal energy systems
    (ECOS 2020 Local Organizing Committee, 2020) Erten, B.; Oral, B.; Utlu, Z.
    Geothermal energy is a sustainable, low cost, inexhaustible, environmentally friendly energy source. On the other hand, the fact that it can be used in many ways, such as electricity generation, heating, and cooling in the health sector, makes geothermal energy important in the world. For this reason, occupational health and safety (OHS) is of great importance in the success of geothermal energy projects, system efficiency, assessment of environmental impacts, protection of human health and prevention of economic losses. In this study, a holistic approach to geothermal energy plants with OHS issues has investigated. Accordingly, a literature survey has conducted on the dangers encountered or may be encountered in geothermal power plants, occupational health, and safety issues. Also, national and international legal regulations were researched. In this regard, Turkey, as well as legal regulations applied in areas where Iceland and the Philippines in geothermal energy production in the world, have shared first place. To analyze the functioning of field application is made observations in a geothermal power plant in Turkey. In this regard, it has been determined that national and international labors in geothermal energy should be supported with a common language, scientific infrastructure, applicability, and legal regulations that will form a basis in terms of OHS. By defining the environmental effects, dangers, and risks of geothermal systems, the emphasis has been placed on the work to be done in the field of OHS. In conclusion, when the legal regulations and literature on geothermal power plants are examined, it is seen that there is a need for guidance studies on the location and importance of OHS issues. © ECOS 2020.All right reserved.
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    Comparison of real and theoretical data in high temperature GaSb cell thermophotovoltaic systems
    (Institute of Thermal Technology, 2019) Utlu, Z.
    In this study, it is aimed to compare real and theoretical data in high temperature GaSb cell thermophotovoltaic systems. The thermophotovoltaic system can be defined as a system that converts the waste heat energy emitted from the heat sources into electrical energy at high temperature. The thermophotovoltaic energy conversion system consists of heat source, selective emitter, filter and photovoltaic cell module.The temperature parameters used are cell temperature and source temperature. With these graphs, energy efficiency, fill factor, effect of open circuit voltage and short circuit current values have been determined. While the efficiency value of the GaSb thermophotovoltaic cell systems was calculated, the radiation source temperature values have been taken in increments of 300 K between 1300 K and 3100 K. The theoretical and real datas obtained from the analysis have been compared. In the theoretical (lossless) analysis, the optimum energy conversion efficiency value of GaSb solar cell structure was found to be 33.14% while it was found to be 21.5763% in real (lossy) analysis. As a result of the obtained results, opinions about the feasibility, efficiency and development of thermophotovoltaic energy conversion systems have been stated and suggestions are presented. © ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. All rights reserved.
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    Energetic and exergetic analysis of thermophotovoltaic systems
    (Institute of Thermal Technology, 2019) Utlu, Z.; Karabuga, A.
    Thermodynamic analysis of the thermophotovoltaic system was carried out in our research and the results are presented. Firstly, the thermophotovoltaic system was analyzed in three different regions. In the analysis, each part of the system is taken separately, while the whole system is handled separately. In the system, the first analysis was resolved following the first law of thermodynamics and the second according to the second law.The first region is the thermodynamic analysis of the heat source of energy that occurs with radiation until it reaches the filter. The second region is where the filter, selective-emitter and photovoltaic cells, considered as photovoltaic systems, take place. The heat radiating from the heat source is evaluated within the scope of the thermodynamic analysis of the heat generated by the electrospinning and the electromotive force of each element. The third region, which is expressed as the last region, is considered to be the part where electric energy is stored. Within the thermodynamic analysis of each region, energy and exergy analysis were carried out and the system was analyzed from part to part. As a result of this induction method, a general energy and exergy efficiency of the whole thermophotovoltaic system is determined. Our results are supported by formulas. It is aimed that the work done will be an alternative to the existing electricity generation and will form a resource for future Works © ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. All rights reserved.
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    Energy usage in electric production sector in terms of environmental impacts and energy planning with Fuzzy TOPSIS method & Game Theory
    (ECOS 2020 Local Organizing Committee, 2020) Altintas, E.; Utlu, Z.
    In recent years, fuzzy multi-criteria decision making (FMCDM) was introduced as a promising and important field of energy supply systems. The aim of this study is that to develop the multi-criteria decision support framework and determine optimal options for energy management in terms of energy used in the electric production sector (EPS) by taking into account the interactions of energy and environment used in production sector. Energy management of the EPS and the environment are investigated in care of game theory approach in decision-making process. The players of game theory approach are the EPS and the environment. Both the EPS and the environment try to find optimal strategies in terms of managing energy policy, the players also have conflicting objectives. The objectives of the EPS player are to ensure sustainability using fossil energy, renewable energy, waste energy recovery and nuclear energy use, while the objectives of the environment player are to ensure the sustainability of the environment. Fuzzy multiple criteria decision making (FMCDM) problem with the Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) is employed for the analysis of the strategies' performance efficiency values and select the best. The rating of each alternative and the weight of each criterion are described by linguistic variables which can be expressed in triangular fuzzy numbers. Then, a vertex method is proposed to calculate the distance between two triangular fuzzy numbers. the concept of the TOPSIS is developed for solving MCDM problems with the basic principle to choose the alternative which has the shortest distance from the fuzzy positive-ideal solution (FPIS) and the farthest distance from fuzzy negative-ideal solution (FNIS). Consequently the most appropriate strategies that determine energy policies for the electric production sector and environment players are found and analyzed with a numerical example. According to results of the pay-off matrix, the equilibrium point is found. An application of this method demonstrates that the EPSs' use of energy triggers the environment's strategy. First and foremost, the environment creates its protection reflex. © ECOS 2020.All right reserved.
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    Evaluation of electrical field effects of façade type a PV panel with occupational health and safety perspective, a case study
    (ECOS 2020 Local Organizing Committee, 2020) Erten, B.; Karabuga, A.; Utlu, Z.
    In this study, the trend towards sustainable building concept has increased considerably in recent years. For this reason, the environmental impacts of photovoltaic (PV) systems integrated into the building have been examined in terms of occupational health and safety (OHS) for buildings that produce their own energy. In addition, the efficiency of the integrated PV systems outside the building is discussed. Therefore, the study is based on two main factors such as environmental effects and system efficiency. We measured the electrical field (electric, magnetic and electromagnetic) of the façade type PV system that building-integrated in Turkey for investigating the environmental effect. The measurements are carried out using the relevant standards, legal regulations and measurement methods at a total of 16 points in the front, top, back and in the inverter room of the panel one day per month for one year. The measurements include the electrical field values of the PV system area, the indoor areas covered by the PV area and the inverter room where the electrical systems are located. The measurements made in the inverter room are evaluated separately, since people are not intense and are located in a separate room. There are specific situations in terms of danger and risks due to the different functioning in this area. Measurement results are interpreted in accordance with OHS rules and legal regulations in terms of human, environment and workplace. While this study highlights the effects of electrical field effects occurring in façade type PV systems in terms of the OHS, it contributes to the proactive approach, which is the main purpose of the OHS. In result of this study, we have obtained during the measurement period, electric field values vary between 0.053 and 0.096 V/m. In addition, we have measure electromagnetic flux values are between 0.154 and 0.242 Gauss. © ECOS 2020.All right reserved.
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    Investigation of performance of thermal power plants in terms of advanced exergy analysis approach
    (ECOS 2020 Local Organizing Committee, 2020) Karabuga, A.; Utlu, Z.; Yildiz, O.
    In this study, the conventional and advanced exergy analysis of a thermal power plant is carried out in Turkey. Energy and exergy balances are established for each component in the system and exergy destruction rates of the system and components are determined. The results obtained are assessment with a new concept, advanced exergy analysis, and the causes of exergy destruction are determined by a detailed examination of the exergy destruction. The system examined is a 1034 MW power generation system. In order to perform traditional and advanced exergy analysis on the system, thermophysical values are measured by determining twenty seven points at the inputs and outputs of each component. As a result, the total exergy destruction of the system is calculated to be approximately 382.3 MW. In addition, the highest exergy destruction among the components is found in the combustion chamber. Therefore, it is predicted that the component with the highest improvement potential is the combustion chamber. © ECOS 2020.All right reserved.