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    Examining the effect of temperature and thicknesss on polycrystalline semi-conductor CIGS solar cell
    (Y�ld�z Technical Univ, 2025) Erbey, M. Mert; Tumen Ozdil, N. Filiz
    Solar panels can convert the sunlight into electricity, which can be used in industry and homes. Using sunlight which is solar energy is the most plenty renewable energy sources on Earth. We acknowledge the criticism regarding the lack of clarity about the innovation in our article. The main objective of this study is to provide a detailed analysis of the factors influencing the performance of CIGS solar cells, specifically focusing on the impact of temperature and thickness on efficiency of solar cell. SCAPS 1D which is a numerical simulation software that (simulating the electrical properties of thin film heterojunction solar cells, considering both DC and AC characteristics.) has been used in this study of copper indium gallium selenide (CIGS) solar cell. In this investigation, the effect of temperature and thickness on efficiency of the solar cells has been investigated. The measurements have been shown and discussed using SCAPS 1D version 3.3.11. The experiment result clearly observed that temperature and thickness diversity directly affect the efficiency of CIGS solar cell. These parameters have been used for CIGS solar cell by electrical properties of I-V measurements. These measurements provide a critical snapshot of the cell's performance under varying operating conditions. By analyzing the I-V curves at different temperatures and thicknesses, the experiment gathered empirical evidence to corroborate our theoretical understanding. The efficiency value for indium gallium selenide (CIGS) solar cell at 300K (Working point of SCAPS 1D is 300 K and this temperature serves as a convenient reference point for calibrating and comparing models, establishing a consistent starting point for further simulations.) has been found optimum value 10.88%. This study showed that as temperature and thickness rises from 200 K to 350 K and from 1 mu m to 5 mu m, the efficiencies of solar cell decrease from 17.2% to 7.5% for CIGS respectively.
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    EXERGOECONOMIC ANALYSIS OF A FLUIDIZED BED COAL COMBUSTION STEAM POWER PLANT
    (Vinca Inst Nuclear Sci, 2017) Tumen Ozdil, N. Filiz; Tantekin, Atakan
    In this study, extensive exergoeconomic analysis is performed for a 6.5 MW steam power plant using the data obtained from running system. The role and impact of the each system component on the first and second law efficiencies are analyzed to understand the individual performance of sub-components. Moreover, the quantitative exergy cost balance for each component is considered to point out the exergoeconomic performance. The analysis shows that the largest irreversibility occurs in the fluidized bed coal combustion (FBCC), about 93% of the overall system irreversibility. Furthermore, it is followed by heat recovery steam generator and economizer with 3% and 1%, respectively. In this study, the capital investment cost, operating and maintenance costs and total cost of FBCC steam plant are calculated as 6.30, 5.35, and 11.65 US$ per hour, respectively. The unit exergy cost and fuel exergy cost, which enter the FBCC steam plant, are found as 3.33 US$/GJ and 112.44 US$/h, respectively. The unit exergy cost and exergy cost of the steam which is produced in heat recovery steam generator are calculated as 16.59 US$/GJ and 91.87 US$ per hour, respectively. This study emphasizes the importance of the exergoeconomic analysis based on the results obtained from the exergy analysis.
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    Experimental and Numerical Investigation of Flow Characteristics Around Complex Bridge Piers in Different Geometries
    (Taylor & Francis Ltd, 2023) Tantekin, Atakan; Tumen Ozdil, N. Filiz; Akilli, Hueseyin
    The flow parameters through complex-type bridge piers configured in various geometries were explored and compared in this work using dye visualisation and computational fluid dynamics (CFD) methods. The Detached Eddy Simulation (DES) technique based on the SST k omega model has been chosen to investigate the flow characteristics around complex bridge piers, and time-averaged normalised mean streamwise velocity, time-averaged normalised mean cross-stream velocity, time-averaged normalised mean pressure, time-averaged normalised mean Reynolds shear stress, time-averaged normalised mean y vorticity, time-averaged normalised mean z vorticity, and drag coefficient have been selected as parameters for this study. According to the study's findings, when the time-averaged normalised mean streamwise velocity component of all complex bridge piers was examined, the pile sections had the highest values. Drag coefficients have been sorted from low to high when comparing complex bridge piers in all geometries such as elliptical, circular, rectangular, and square.Article Highlights Flow characteristics around complex bridge piersDye visualisation experiments and CFD method with DES based on the SST k omega modelDrag Coefficients of complex bridge piers
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    Numerical Investigation of Flow Around Single and Tandem Cylindrical Complex Bridge Piers
    (Springer, 2025) Tantekin, Atakan; Tumen Ozdil, N. Filiz; Akilli, Huseyin
    This study investigates the flow characteristics around complex bridge piers in both single and tandem configurations, aiming to enhance understanding of their hydrodynamic performance. The research gap identified is the limited exploration of flow dynamics specific to bridge pier configurations, particularly under real-life flow conditions. The objectives of this study were to analyze the velocity, pressure, and vortex distributions around the piers, as well as to evaluate the drag coefficients for different configurations. Using Computational Fluid Dynamics (CFD), time-averaged, normalized mean stream wise and cross-stream velocities, pressure distributions, and y-vorticity values were examined. The key findings include the highest velocity values at the pile sections, significant pressure effects on the front face of the piers, and the formation of prominent vortices near the pile cap. Additionally, drag coefficients were found to be 1.090 for the single pier and 1.102 for the tandem pier, highlighting the significant impact of pier configuration on hydrodynamic performance. This study provides valuable insights into the fluid-structure interactions around bridge piers, contributing to the design optimization and safety analysis of bridge structures in complex flow conditions.