Browsing by Author "KERBOUA Kaouther (Co-Auteur)"

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    Comprehensive Modeling Study of the Electrical Performance of a Sono Electrolyzer under a Voltage and Current Sources Supply: From Grey to Green Hydrogen
    (The Eurasia Proceedings of Science, Technology, Engineering & Mathematics (EPSTEM), 2023) KERBOUA Kaouther (Co-Auteur)
    Hydrogen production from water electrolysis is seen as a promising technology to produce hydrogen with high purity of 99.99%. However, the increase of the ohmic resistance in the electrolyte remains a challenge for the electrolytic technique. In the present work, we study the transition from grey hydrogen to green hydrogen using alkaline electrolysis (25% w/w KOH solution electrolysis). We compare hydrogen production efficiency using a voltage source simulating the conventional DC generator, and a current source simulating the PV power supply. Water electrolysis was coupled to an indirect ultrasound source in order to investigate its effect on hydrogen production process in both cases of power supply. The question was tackled experimentally using an H-cell electrolyzer and an ultrasonic bath, and numerically using a MatLab code. Energy conversion efficiency and hydrogen production rate were determined both experimentally and through simulation. It was demonstrated that the integration of sonication reduces the ohmic resistance within the electrolyzer and thus decreases the cell voltage for the same current, which enhances the energy efficiency in the case of current source for the same hydrogen production rate. For instance, an enhancement of 1% was recorded in the energy efficiency using a current source of energy, while is equals 2.68% in the case of voltage source. Therefore, the coupled of sono electrolysis process to solar PV seems to be a promising pathway for an environmentally friendly hydrogen production technique from an energetic perspective.
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    Dynamic Response of a Sono-Electrolyzer under PV Supply for Hydrogen Production: A Modelling Approach for the Kinetic and Energetic Assessment under Northern Algerian Meteorological Conditions †
    (Engineering Proceedings, 2023) KERBOUA Kaouther (Co-Auteur)
    The experimental work is based on the PV solar powered membraneless KOH alkaline sono-electrolyzer using indirect continuous sonication under real meteorological conditions. The site of the study (36.9 N, 7.77 E) is located at the extreme North-East of Algeria, covering the semester ranging from March to September. A validated semi-empirical model for the dynamic assessment of the global incident solar radiation is adopted, in association with a fundamental model based on the electrical analogy of the electrolytic cell. The experimental setup and measurements coupled to the preliminary numerical model led to a fraction of electrode coverage of 37% with a maximum recovery of 13%and10%inohmicandcellvoltages, respectively. The characterization of the sonication system through the calorimetric technique demonstrated an acoustic efficiency of 13.7%.
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    Green Hydrogen from PV-Supplied Sono-Electrolysis: Modelling and Experimental Investigations of the Mechanism and Performance
    (The Eurasia Proceedings of Science, Technology, Engineering & Mathematics (EPSTEM), 2023) KERBOUA Kaouther (Co-Auteur)
    Water and energy are the two most essential assets for a sustainable global human society. However, the high carbon footprint and global warming effects caused by non-renewable sources have made energy transition a key element to ensure sustainable development. Currently, hydrogen produced from water supplied by renewable energy is considered an ideal and sustainable energy carrier for the future. Herein, we investigate experimentally and theoretically using MatLab modeling the production of hydrogen via PV supplied alkaline electrolysis of water coupled to 40 kHz ultrasonic bath. Nickel plates and nickel foam were used as electrode’s material immerged in 25% of KOH electrolyte while a 12V solar panel was used as a green source of power supply. The experimental and the modeling results related to the ultrasounds effect on hydrogen production efficiency showed a high agreement. The integration of ultrasound showed a reduction in electrode coverage by bubbles of approximately 54.8%, which was equivalent to 9.32% of the reduction in cell voltage according to the experiments.