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iEnergy 2024年第1期3卷 28-38页

作者： Emmanuel Akono Sarsah albert kojo sunnu Abdul-Rahim Bawa Mechanical Engineering Department Dr.Hilla Limann Technical UniversityWaGhana Department of Mechanical Engineering Kwame Nkrumah University of Science and TechnologyKumasiGhana

Transition toward a sustainable,low-carbon energy future requires innovative,integrated *** solar-hydrogen systems(HSHSs),which combine solar energy harvesting and hydrogen production,have excellent prosepects to address challenges related to renewable energy generation,storage,and *** article presents an overview of the research on the technical and economic feasibility of HSHSs,aimed at comprehensively articulating their current state,notable advancements,and future research *** begins by elucidating solar energy principles and conversion methods and emphasizing the potential of solar energy for hydrogen *** study then explores the definitions,components,and synergistic integration of *** energy conversion and storage methods for efficient hydrogen production and storage are also *** study reviews the techniques employed for techno-economic evaluations over the last six years,addressing challenges such as the intermittency of solar energy and the efficiency of hydrogen production *** review of the ongoing research provides helpful insights into the technological and economic feasibility of *** underscores the necessity of continuous research and development efforts to overcome existing challenges and unlock their full *** systems can play a vital role in achieving a cleaner and more resilient energy future by optimizing the system performance,reducing costs,and fostering supportive policy frameworks.

关键词： Hybrid solar-hydrogen systems techno-economic feasibility solar energy hydrogen production renewable energy integration

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Particle Size and Concentrations of the Harmattan Dust Near the Gulf of Guinea

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Journal of Environmental Science and Engineering(A) 2012年第10期1卷 1203-1210页

作者： albert kojo sunnu Department of Mechanical Engineering College of Engineering Kwame Nkrumah University of Science and Technology (KNUST) Kumasi Ghana

The seasonal transport of the Saharan dust to the West African region, near the Gulf of Guinea, during northem winter has been studied over 12 years. Using an optical particle counter, the dust aerosols in the diameter range 0.5-25 μm have been sampled at Kumasi （6040＇ N, l°34＇ W） in Ghana during the winter months of January-February from 1997 to 2009. The settling atmospheric dust particles observed during the peak Harmattan and the background Harmattan periods are analysed for the mean particle size, number and mass concentrations as well as the particle size-frequency. It is shown that the average daily particle diameter, number and mass concentrations obtained in the peak Harmattan periods are 1.57 ± 0.54 μm, 50 ± 25 particles/cm3 and 1,130 ± 994 μg/m3, respectively, while for the background Harmattan these values are correspondingly, 1.31 ±0.31 μm, 32 ±12 particles/cm3 and 576 ±429 μg/m3, respectively. These experimental results will be useful for the design of ambient air-filters and for understanding the West African climate change.

关键词： Saharan dust Harmattan particle size particle concentration

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