Ahmed Abokhalil

Dr. Ahmed Abokhalil

Sustainable and renewable energy engineering, College of Engineering, University of Sharjah, Emirate of Sharjah, United Arab Emirates
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Research Focus & Metrics

Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 April 2024 in Heliyon
Verified
Journal Article
Open access
Ahmed AbokhalilAhmed Abokhalil
Ahmed Abokhalil
This paper undertakes a comprehensive investigation into incorporating sustainability within higher education, aligning with the United Nations' Sustainable Development Goals (SDGs). Utilizing quantitative and qualitative research methods, our study delves into the status quo, methodologies, and impacts of sustainability education across a spectrum of international and local settings, with a specific lens on the United Arab Emirates. Our analysis spans various topics, from best practices in sustainability integration and educational frameworks to the influence of global initiatives like the Impact Ranking on promoting SDG-aligned transformations within academic institutions. Highlighting case studies from the UAE, we provide concrete evidence of successful sustainability strategies and interventions. These are juxtaposed with a global overview that uncovers the varying challenges and opportunities present in implementing sustainability education worldwide. Among our key findings is the essential role of interdisciplinary approaches and the critical need for active faculty involvement in fostering sustainability education. Drawing from a rich compilation of data and narratives, the paper presents a set of strategic recommendations designed to enhance the efficacy and reach of sustainability education. These recommendations are informed by the challenges observed and the success stories identified during our investigation. Ultimately, our research underscores the indispensable role that higher education plays in preparing future generations to navigate and address the complexities of sustainability challenges effectively.

8 January 2020 in IEEE Access
Verified
Journal Article
Open access
Ali EltamalyAli Eltamaly
Ali Eltamaly
MSMamdooh Al Saud
Mamdooh Al Saud
Ahmed AbokhalilAhmed Abokhalil
Ahmed Abokhalil
Power versus voltage curves of partial shading photovoltaic (PV) systems contain several local peaks (LPs) and one global peak (GP). Most conventional maximum power point tracker (MPPT) techniques may not follow the GP under partial shading conditions (PSC). The use of metaheuristic techniques such as the bat algorithm (BA) and particle swarm optimization (PSO) can overcome these obstacles. All problems inherent in the using of BA as MPPT of PV systems has been discussed and solved in this paper. The first problem is the random initial values of bats that may cause premature convergence. Therefore, the initial values of bats were modified to be close to the anticipated positions of peaks to reduce the convergence time and improve the chance of capturing the GP. The second problem occurs when shading pattern changes the value and position of the GP which is not configurable because all bats are concentrated at the previous GP; this can be resolved by BA re-initialization. The the third problem is the GP memorized in the execution of the BA code forces the PV system to work at the duty ratio of the highest GP ever seen, which may not be the real GP. This problem is solved by updating the memorized GP. This paper also proposes a new criterion for selecting the optimal swarm size against number of peaks to reduce the convergence time and improve the chance of capturing the GP. To the authors’ knowledge, most of these problems inherent in the BA have hitherto not been addressed in the literature. The simulation and experimental results obtained from the proposed modified BA (MBA) with re-initialization have been compared to the PSO and grey wolf optimization (GWO) techniques which show the superiority of using MBA strategy in the MPPT of partial shading PV systems.

7 November 2019 in Energies
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Journal Article
Open access
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Khairy Fathy Abdelsayed SayedKhairy Fathy Abdelsayed Sayed
Khairy Fathy Abdelsayed Sayed
Ahmed AbokhalilAhmed Abokhalil
Ahmed Abokhalil
AAAli S. Alghamdi
Ali S. Alghamdi
This paper introduces an energy management and control method for DC microgrid supplying electric vehicles (EV) charging station. An Energy Management System (EMS) is developed to manage and control power flow from renewable energy sources to EVs through DC microgrid. An integrated approach for controlling DC microgrid based charging station powered by intermittent renewable energies. A wind turbine (WT) and solar photovoltaic (PV) arrays are integrated into the studied DC microgrid to replace energy from fossil fuel and decrease pollution from carbon emissions. Due to the intermittency of solar and wind generation, the output powers of PV and WT are not guaranteed. For this reason, the capacities of WT, solar PV panels, and the battery system are considered decision parameters to be optimized. The optimized design of the renewable energy system is done to ensure sufficient electricity supply to the EV charging station. Moreover, various renewable energy technologies for supplying EV charging stations to improve their performance are investigated. To evaluate the performance of the used control strategies, simulation is carried out in MATLAB/SIMULINK.

6 July 2023 in Case Studies in Thermal Engineering
Verified
Journal Article
Open access
Ahmed AbokhalilAhmed Abokhalil
Ahmed Abokhalil

26 February 2019 in Symmetry
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Journal Article
Open access
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Ibrahim M. AlarifiIbrahim M. Alarifi
Ibrahim M. Alarifi
Ahmed AbokhalilAhmed Abokhalil
Ahmed Abokhalil
MOM. Osman
M. Osman
Liaquat Ali LundLiaquat Ali Lund
Liaquat Ali Lund
MAMossaad Ben Ayed
Mossaad Ben Ayed
Iskander TliliIskander Tlili
Iskander Tlili
A steady laminar flow over a vertical stretching sheet with the existence of viscous dissipation, heat source/sink, and magnetic fields has been numerically inspected through a shooting scheme based Runge—Kutta–Fehlberg-integration algorithm. The governing equation and boundary layer balance are expressed and then converted into a nonlinear normal system of differential equations using suitable transformations. The impact of the physical parameters on the dimensionless velocity, temperature, the local Nusselt, and skin friction coefficient are described. Results show good agreement with recent researches. Findings reveal that the Nusselt number at the sheet surface augments, since the Hartmann number, stretching velocity ratio A, and Hartmann number Ha increase. Nevertheless, it reduces with respect to the heat generation/absorption coefficient δ.

8 February 2022 in Energies
Verified
Journal Article
Open access
PDF file
Khairy Fathy Abdelsayed SayedKhairy Fathy Abdelsayed Sayed
Khairy Fathy Abdelsayed Sayed
AAAbdulaziz Almutairi
Abdulaziz Almutairi
NANaif Albagami
Naif Albagami
Omar AlrumayhOmar Alrumayh
Omar Alrumayh
Ahmed AbokhalilAhmed Abokhalil
Ahmed Abokhalil
Hedra SaleebHedra Saleeb
Hedra Saleeb
This paper comprehensively reviews the current status of multidisciplinary technologies in electric vehicles. Because the electric vehicle market will expand dramatically in the coming few years, research accomplishments in power electronics technology for electric vehicles will be highly attractive. Challenges in power electronics technology for driving electric vehicles, charging batteries, and circuit topologies are being explored. This paper aims primarily to address the practical issues of the future electric vehicles and help researchers obtain an overview of the latest techniques in electric vehicles, focusing on power electronics-based solutions for both current and future electric vehicle technologies. In this work, different medium-and high-voltage DC-AC inverter topologies are investigated and compared in terms of power losses and component requirements. Recent research on electric vehicle power converters is also discussed, with highlighting on soft-switching and multilevel inverters for electric vehicle motor drives. In this paper, a methodical overview and general classification of DC-AC power converters are presented. In specific topologies, drawbacks such as voltage stresses on active switches and control complications may occur, which can make them difficult for immediate commercialization. However, various modified circuit topologies have been recommended to overcome these drawbacks and enhance the system performance.