Standalone green hydrogen production powered by photovoltaic panels and solar atmospheric water harvesting hybrid system: Experimental investigation

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2024-11-16 DOI:10.1016/j.ijhydene.2024.11.221

Rania S. Nada , Mohamed Emam , Hamdy Hassan

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Abstract

The current study experimentally investigates the performance of a hybrid standalone solar system of atmospheric water harvesting (AWH) and solar photovoltaic powering electrolyzer for green water and green hydrogen production. The system prototype is designed, constructed, and tested under outdoor summer and winter climate conditions of Alexandria, Egypt at different operating and design enhancement conditions. Water electrolyzes concept for green hydrogen production system driven by a photovoltaic panel and silica gel absorption/desorption atmospheric water harvesting solar still concept with insertion of porous sheet metals for freshwater production is performed and evaluated. The results show a rise of the AWH freshwater production of (60% and 120%) and (146% and 260%) in summer and winter, respectively with the insertion of one and two porous metal sheets, respectively. The maximum rise of the AWH efficiency is 82% in summer and 53.4% in winter by using 2 porous metal sheets. The hydrogen production rate of the system in summer is higher than that of winter by about 25%. System efficiency is almost doubled when electrolyzer KOH concentration increased from 4 gm/kg to 12 gm/kg water. The average daily system efficiency of the AWH, electrolyzer, and overall system reaches 11.6%, 65.1%, and 2.6% when operating at a KOH concentration of 12 gm/kg with two porous metal sheets. The study contributes to achieving mainly SDG goals 6, 7, and 13.

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由光伏板和太阳能大气集水混合系统驱动的独立绿色氢气生产：实验研究

本研究通过实验调查了大气水收集（AWH）和太阳能光伏发电电解槽混合独立太阳能系统在绿色水和绿色氢气生产方面的性能。系统原型是在埃及亚历山大的夏季和冬季室外气候条件下，在不同的运行和设计增强条件下设计、建造和测试的。对由光伏板和硅胶吸收/解吸大气水收集太阳能蒸发器概念驱动的绿色制氢系统的水电解概念进行了研究和评估，并插入了用于淡水生产的多孔金属片。结果表明，插入一块和两块多孔金属板后，夏季和冬季的大气集水淡水产量分别提高了（60%和 120%）和（146%和 260%）。使用两块多孔金属板后，夏季和冬季的 AWH 效率分别提高了 82% 和 53.4%。该系统在夏季的制氢率比冬季高出约 25%。当电解槽的 KOH 浓度从 4 克/千克水增加到 12 克/千克水时，系统效率几乎翻了一番。当 KOH 浓度为 12 gm/kg 且使用两块多孔金属板时，AWH、电解槽和整个系统的平均日系统效率分别达到 11.6%、65.1% 和 2.6%。这项研究主要有助于实现可持续发展目标 6、7 和 13。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.