Yazar "Alsharif, Abdulgader H." seçeneğine göre listele

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    Design of reliable standalone utility-scale pumped hydroelectric storage powered by PV/Wind hybrid renewable system
    (Elsevier, 2024-12-15) Nassar, Yasser F.; El-Khozondar, Hala J.; Khaleel, Mohamed M.; Ahmed, Abdussalam A.; Alsharif, Abdulgader H.; Elmnifi, Monaem H.; Salem, Mansour A.; Mangir, Ibrahim
    With a target of 35 % renewable energy in the country's energy mix by 2030, the goal of this research is to support the Libyan government's plan to maximize the use of environmentally friendly and sustainable energy sources. This will be accomplished by making effective use of the region's plentiful natural resources. The feasibility of wind and solar energy has been established by local research, and the presence of highlands that can store pumped hydropower (PHS) makes hybrid renewable energy systems (HRES) even more feasible. These systems might offer a sizable edge over competitors in the regional energy market. In this study, PHS was utilized to stabilize electricity production in addition to storing energy. A hydropower turbine provides electricity to the load, and the PHS system is powered by a PV/wind supply. By lowering the volatility of wind and photovoltaic power generation, the suggested system could offer a more dependable renewable energy source without requiring complicated control mechanisms. This strategy could encourage a wider adoption of renewable energy, which could be especially advantageous for developing nations. Under particular load and climate conditions, the energy production of different solar PV array and wind turbine farm configurations was estimated using the System Advisor Model (SAM) software. The ideal HRES configuration consists of a 290 MW wind farm, a 154 MW solar PV field, and a 508 MW PHS system. This configuration will provide 100 % of the annual electrical demand of 513 GWh, plus a 20 % safety margin. The levelized cost of energy (LCOE), estimated at $211.65/MWh, is reduced by this configuration. It is anticipated that the $929.02 million initial investment will be recovered in 11 years, and the system will turn a profit in the following 9 years. Also, the planned HRES will stop 532.17 tons of CO2 emissions from being released each year.
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    Sensitivity of global solar irradiance to transposition models: assessing risks associated with model discrepancies
    (Elsevier, 2024-12-29) Nassar, Yasser F.; El-Khozondar, Hala J.; Khaleel, Mohamed M.; Ahmed, Abdussalam A.; Alsharif, Abdulgader H.; Elmnifi, Monaem; Nyasapoh, Mark Amoah
    Estimating solar irradiance is essential for solar energy systems evaluations, energy audit of buildings and. Global and sky-diffuse horizontal irradiances are measured by meteorological stations and satellites. Global horizontal solar irradiance is converted into a global tilted solar irradiance using transposition models (TMs). Despite its importance, many sites—especially isolated rural areas in need of sustainable energy sources—have a conspicuous dearth of information regarding these models. Significant errors can occur when choosing the incorrect TM for feasibility assessments or determining the optimum tilt angles (β) for solar collectors. A novel theory (Risky Index theory) for determining the least risky TM is introduced in this work. To evaluate and validate the proposed theory, eight commonly used TMs from literature, database platforms and software were chosen and tested on 133 sites with various climatic and geographical conditions in the Northern Hemisphere. The study concludes that risk index (RI) is <10 % for all models when the collector is facing south with low tilt angles (β<40°). However, for 40°< β<60° the RI rises above 15 %, and it becomes significant (RI<50 %) as β becomes close to vertical plane. The least risky TM was determined for each site. The results matched satisfactorily with other researchers’ outputs without exceeding 3.5 % of error. A unique TM has been recommended for the entire world corresponding to each interval of β.