Yazar "Ilbas, Mustafa" seçeneğine göre listele

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    Investigation of the effect of ion transition type on performance in solid oxide fuel cells fueled hydrogen and coal gas
    (Pergamon-Elsevier Science Ltd, 2022) Kumuk, Berre; Alemu, Molla Asmare; Ilbas, Mustafa
    Renewable energy will be a panacea for environmental difficulties due to the extensive usage of carbon-rich fuels as a main source of energy. As a result, hydrogen-fueled solid oxide fuel cell is a revolutionary clean technology that has a great contribution in solving the current energy and environmental-related challenges. Thus, a 3D model of hydrogen and coal gases fueled solid oxide fuel cell (H2-SOFC) using different electrolytes has been developed and simulated using COMSOL commercial software to explore the performance of electrolyte supported SOFC. The performance of the developed model has been studied and characterized using different differential equations. Accordingly, it has been found that the performance of hydrogen-fueled oxide ion conducting electrolytes (SOFC-O) is lower than that of protonic conducting one (SOFC-H) at 800 degrees C. Furthermore, a numerical simulation has been conducted to investigate the result of temperature changes on SOFC performance at 400 degrees C, 600 degrees C, and 800 degrees C for proton-conducting SOFC and 800 degrees C and 1000 degrees C for oxygen-conducting SOFC. It has been demonstrated that SOFC-O shows a better performance at high temperatures compared with SOFC-H while SOFC-H can be an agreeable selection at medium temperatures. Therefore, this study reveals that the temperature augments the performance of both electrolytes, yet at higher working temperatures SOFC-H becomes more advantageous than SOFC-O to use hydrogen and coal gas as a primary fuel. Besides, the effect of channel height was also analyzed numerically and the finding disclosed that decreasing the channel height emerges in a curtly current path. Thus, it can be reasoned out that the performance of SOFC decreases when the channel height is increased. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Öğe
    Numerical and experimental studies on unitized regenerative proton exchange membrane fuel cell
    (Pergamon-Elsevier Science Ltd, 2023) Yelegen, Nebi; Kumuk, Berre; Kaplan, Ruveyda N.; Ilbas, Mustafa; Kaplan, Yuksel
    Increasing energy need and running out of fossil-based fuels direct us to renewable energy resources. Although hydrogen is not an energy source by itself, it is an energy carrier with a high specific heat capacity. As it is used as fuel in unitized regenerative PEM fuel cells, water is separated in electrolyzer mode and stored by producing hydrogen when there is no need for energy. In this study, performance tests on the unitized regenerative PEM electrolyzer/fuel cell were carried out and numerical modelling has been performed. The validity of the developed model was confirmed by the results of the experimental study. Before starting the performance tests, the cell's leakproofness tests were carried out, and the appropriate torque force was optimized, reducing the contact resistance that causes performance loss. The material selection of the cell components and corrosion-resistant materials that can operate in both electrolyzer and fuel cell modes were preferred. In this study, 0.019 slpm of hydrogen and 0.0095 slpm of oxygen gas is produced in the electrolyzer mode, while a power density of 0.353 W/cm2 is obtained in the fuel cell mode at 80 degrees C, from a unitized regenerative PEM fuel cell with a 5 cm2 active area, whose cell elements are combined with a 3 Nm clamping torque by using 12 bolts. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Öğe
    Simulation of hydrogen and coal gas fueled flat-tubular solid oxide fuel cell (FT-SOFC)
    (Pergamon-Elsevier Science Ltd, 2022) Cimen, Fethi Mustafa; Kumuk, Berre; Ilbas, Mustafa
    Solid oxide fuel cells (SOFCs) are considered an important technology in terms of high efficiency and clean energy generation. Flat-tubular solid oxide fuel cell (FT-SOFC) which is a combination of tubular and planar cell geometries stands out with its performance values and low costs. In this study, the performance of an FT-SOFC is analyzed numerically by using finite element method-based design as a result of changing parameters by using different fuels which are pure hydrogen and coal gas with various proportions of CO. In addition, cell performance values for different temperatures were analyzed and interpreted. Analyzes have been performed by using COMSOL Multiphysics software. The rates of CO composition used are 10%, 20%, and 40%, respectively. In addition, the air was used as the oxidizer in all cases. The cell voltage and average cell power of the FT-SOFC were examined under the 800 degrees C operating condition. The maximum power value and current density value were obtained as 710 W/m(2) and 1420 A/m(2) for the flat-tubular cell, respectively. As a result of the study, it was observed that the maximum cell power densities increased with increasing temperature. Analysis results showed that FT-SOFCs have suitable properties for different fuel usage and different operating temperatures. High-performance values and design features in different operating conditions are expected to make FT-SOFC the focus of many studies in the future. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.