Practical Evaluation and Theoretical Modelling of Charging Process for Lead Acid Batteries in PV Systems rayhan abdo, Aiat Elfoly Hegazy, Essam Elsherbini, Essam Tawfiek Elshennawy Egyptian Journal of Chemistry, 2024 The growing population along with the socio-economic development has led to increased global electricity demand. Accordingly, there is a growing interest in PV systems as a viable solution to address this electricity shortage. Batteries play an important role not only in PV systems but also in the electrical and hybrid electric vehicle industries. Efficient power control and management of batteries are essential for ensuring the safety and optimal performance of PV systems and automotive industries. This paper has provided valuable insight into the charging process of lead-acid batteries across a wide range of states of charge (SOC%) to achieve significant improvements in battery technology and develop more efficient charging methods via the validation of the modified Thévenin model. The electric characteristics for the models were assessed as a function of SOC% to accurately represent battery performance while maintaining model simplicity, and enhancing model topology by establishing an accurate relationship between battery capacity or SOC% and voltage. Additionally, efforts were made to enhance the model topology by establishing an accurate relationship between battery capacity or SOC and voltage. The modified Thévenin model was experimentally validated on a 200 Ah lead acid battery at full charge (at approximately 100% SOC), resulting in a Root Mean Square Error (RMSE) of around 1%. This validates that the model effectively captures battery behavior across its entire operating range.
Superior visible light antimicrobial performance of facet engineered cobalt doped TiO2 mesocrystals in pathogenic bacterium and fungi Ayat N. El-Shazly, Gharieb S. El-Sayyad, Aiat H. Hegazy, Mahmoud A. Hamza, Rasha M. Fathy, et al. Scientific Reports, 2021 Pristine and Co-doped TiO2 mesocrystals have been synthesized via a simple sol–gel method and their antimicrobial activity has been investigated. The antimicrobial performance was evaluated in terms of zone of inhibition, minimum inhibitory concentration (MIC), antibiofilm activity, and effect of UV illumination in liquid media. The Co-doped TiO2 mesocrystals showed very promising MIC of 0.390 μg/mL and 0.781 μg/mL for P. mirabilis and P. mirabilis, respectively. Additionally, the material showed an MIC of 12.5 μg/mL against C. albicans, suggesting its use as antifungal agent. Upon the addition of 10.0 µg/mL of Co-doped TiO2 mesocrystals, the biofilm inhibition% reaches 84.43% for P. aeruginosa, 78.58% for P. mirabilis, and 77.81% for S. typhi, which can be ascribed to the created active oxygen species that decompose the tested microbial cells upon illumination. Thus the fabricated Co-doped TiO2 mesocrystals exhibit sufficient antimicrobial features under visible light, qualifying them for use as antimicrobial agents against pathogenic bacteria and fungi and subsequently inhibit their hazardous effects.
High performance crystalline TiO2 mesocrystals for enhanced solar fuel Aiat Hegazy Egyptian Journal of Chemistry, 2019 Titanium dioxide (TiO2) is one of the most abundant compounds in our planet. It is cheap, non- toxic, highly chemically and thermally stable semiconductor material. Titanium dioxide nanoparticles (TiO2-NPs) show high visible light transparency combined with high UV light absorption. However, altering the particle size and crystalline structure of TiO2-NPs influences the absorption range, adsorption of dye molecules and electron transfer rate at the surface. Unfortunately, TiO2-NPs suffer high electron/hole recombination rates. Therefore, an ordered superstructure consisting of nanoparticles on the scale of nanometers to several micrometers is proposed titanium dioxide mesocrystals (TiO2-MCs). In this work, we represent a new and facile way to fabricate TiO2-MCs with spherical structure by sol-gel method. We were able to fabricate spherical TiO2-NCs with narrow size distribution by controlling the hydrolysis conditions. The effect of air annealing on the morphology, size shrinkage, and phase transition of the nanoparticles was studied by scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. Also, the fabricated TiO2-MCs showed exceptional photoactivity compared to their Degussa p-25 nanoparticles counterparts upon their use in water splitting cells.
Simple maximum power point tracker based on perturb and observe technique for PV module Arpn Journal of Engineering and Applied Sciences, 2019
Determination of the PV module surface temperature based on neural network using solar radiation and surface temperature Arpn Journal of Engineering and Applied Sciences, 2019
