Yazar "Karatas, Osman Bedrettin" seçeneğine göre listele

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    Experimental and Numerical Analysis of the Effect of Components on a Double-Sided PCB on LED Junction Temperature and Light Output Using CFD
    (Springer Heidelberg, 2020) Sökmen, Kemal Fürkan; Karatas, Osman Bedrettin
    In today's lighting industry, with developing technology and a widened usage area, LEDs have become very popular due to their higher energy efficiency and longer life. In the present study, the effect of electronic components on printed circuits and the radiation level on light output was studied. The performed analysis was validated with an experimental method. For the finite volume method, FloEFD 2019, commercial software, was used. The ambient temperature was assumed to be 23 degrees C. The value of solar irradiance was taken as 1009 W/cm(2). LEDs on a PCB were driven at 70 mA at first and then at 50 mA, and, by exerting power on all electronic components, analyses were performed. Both sides of the PCB were examined, and, in order to achieve efficient heat conduction, the power and distribution of the electronic components on the back side of the LEDs were optimized. With a new electronic circuit design, analyses were performed at 50, 55, 60, 65, and 70 mA. It was determined that the highest light output was achieved at 65 mA and that the distribution of electronic components on a PCB indirectly affects light output through junction temperature (T-j).
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    Thermal management and fin characteristic optimization of an electronic power supply utilizing Taguchi and ANOVA methods
    (Pergamon-Elsevier Science Ltd, 2024) Bademlioglu, Ali Husnu; Karatas, Osman Bedrettin; Sokmen, Kemal Furkan; Yuruklu, Emrah
    In the rapidly advancing field of electronic power supplies, managing thermal performance is critical. This study focuses on optimizing fin geometries to enhance the thermal management of an amplifier used in car multimedia systems, utilizing Taguchi and ANOVA methods for both thermal and volumetric efficiencies. Analyses were conducted on the impact of five distinct fin parameters-fin gap, fin thickness, separated plate thickness, fin base thickness, and fin height-on the system's thermal behavior and the fin volume. Computational Fluid Dynamics (CFD) analyses were performed for 24 different configurations. These analyses showed significant potential for improvement in the original design, with optimizations leading to an 8.31% reduction in the amplifier temperature and a 51.91% reduction in the fin volume. The study identifies fin height as the most effective parameter on the amplifier temperature, with an effect rate of 57.26%, while fin base thickness showed the most significant effect on the fin volume, with an effect rate of 66.98%. These findings not only provide a basis for more efficient design but also offer predictive insights through formulated regression equations, thus reducing the dependency on extensive experimental setups.
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    Thermal optimization of intercellular distance in lithium-ion batteries and numerical analysis of the original honeycomb metal integrated battery pack
    (Elsevier, 2022) Karatas, Osman Bedrettin; Sokmen, Kemal Furkan
    In Lithium-ion batteries, it is necessary to keep the system temperature within an acceptable range to extend the working life. A thermal management system is also required to maintain temperature uniformity. In this study, first, the steady and transient thermal behavior of 18650 Lithium-ion batteries was investigated, and the results were validated. After this, a module design consisting of 14 battery cells was made and the distance intercellular in this module was optimized. A thermal analysis study of the battery pack was carried out for the most suitable layout. In the study, the differences among modules with cell connection distances of 20, 25, 30, 35 and 40 mm were compared in terms of heat transfer and mounting. To calculate heat transfer data, a Computational Fluid Dynamics based program, FLOEFD was used. According to the results obtained from the analyses, it was determined that the distances between cell centers should be 20 mm, or 25 mm in terms of heat transfer and mounting. Additionally, the design of a metal insert with a honeycomb shape inside the plastic enclosure of the module containing 14 battery cells was examined. It was found that the designed metal insert package had a significant effect on lowering the temperature of the batteries. While the open module maximum temperature was 41.89 degrees C, the module maximum temperature in the package dropped to 37.39 degrees C. In addition, effective results were obtained for equal aging. The cell temperature differences were found to be 0.24 degrees C, 0.17 degrees C, and 0.59 degrees C for Aluminum, Copper and Steel, respectively in metal integrated battery pack analyzes.