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    A bibliometric and performance evaluation of nano-PCM-integrated photovoltaic panels: Energy, exergy, environmental and sustainability perspectives
    (Pergamon-Elsevier Science Ltd, 2024) Bestas, Sukru; Aktas, Ilter Sahin; Bayrak, Fatih
    One of the major problems regarding PV panels is the decline in power output and efficiency whilst exposed to temperatures surpassing their operating temperature. In order to preclude such undesirable situation, it is imperative to cool PV panels and provide a uniform distribution of surface temperatures during the implementation of the cooling method. Thermal management can be achieved at the surface temperatures of PV panels by utilizing phase change materials (PCMs). In this study, along with PCM, the potential of enhancing output parameters by decreasing the surface temperature of PV panels with the addition of nanoparticles (Al 2 O 3 ) at different concentrations (0.05%, 0.1%, and 0.15% w/v) to PCM (RT35) is examined. The study compared five systems: a reference PV panel (PV), PV panel cooled with PCM without nanoparticles (PV PCM-0 ), and PV panels with PCM containing different concentrations of nanoparticles (PV PCM-0.05 , PV PCM-0.1 , and PV PCM-0.15 ). Among the five different systems, the PV panel containing 0.15% w/v nanoparticles (referred to as PV PCM-0.15 ) demonstrated the most effective cooling capability. Moreover, the PV PCM-0.15 system provided the highest performance with a 19.49% increase in panel power output. PV systems have average energy and exergy efficiency values of 9.06% and 3.79% for PV panel, 9.60% and 5.15% for PV PCM-0 , 9.70% and 5.12% for PV PCM-0.05 , 10.28% and 6.01% for PV PCM-0.1 , and 10.44% and 7.29% for PV PCM-0.15 . Upon analyzing the sustainability metrics, it was determined that the PV PCM-0.15 system was more energy and environmentally sustainable than the others.
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    A case study of techno-economic and environmental analysis of college rooftop for grid-connected PV power generation: Net zero 2050 pathway
    (Elsevier, 2024) Aktas, Ilter Sahin; Ozenc, Salih
    In this study, a grid -connected solar photovoltaic plant (SPV) is designed, evaluated and analysed to meet the energy consumption of the College of Science and Technology in Siirt province, Turkey. The comprehensive financial and technical statistics in relation to parameters utilised within the system are presented alongside thorough economic and environmental evaluations. The design, economics, and technical evaluation of the system are supported by using PVsyst, PV*SOL and HOMER Pro. Based on the findings of the analysis, it has been determined that the photovoltaic installation is projected to provide an estimated 762 MWh of energy. In the economic evaluation conducted, the internal rate of return (IRR) was determined to be 19.55 %, the net present value (NPV) was calculated to be 346,085 USD with Levelized Cost of Energy (LCOE) of 0.1892 USD/kWh. In addition, the payback period of the photovoltaic plant is determined to be 17.4 years. The implementation of the photovoltaic panel system will result in an estimated reduction of roughly 6852 tonnes of carbon dioxide (tCO 2 ) emissions.
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    Comprehensive analysis of offshore wind farm and evaluation of wind energy potential: a case study of the University of Southampton
    (Inderscience Enterprises Ltd, 2023) Aktas, Ilter Sahin
    The aim of this paper is to provide 40% of electricity consumption of Highfield Campus at the University of Southampton. The wind data is observed during the year of 2019 at three different heights, 10 m, 25 m and 45 m and obtained wind velocities are found as 6.34 m/s, 7.1 m/s and 7.48 m/s, respectively. According to the collected data, the best location for the wind turbine is proposed to be on the coast of the Isle of Wight. The system is designed with an installed capacity of 3.45 MW wind turbine. Based on the hub height and rotor diameter results run in MATLAB environment, two different solutions of turbine were given. Providing energy requirement of the campus with wind energy, there will be a decrease of approximately 20,000 tCO(2) emissions per year. The diameter of the rotor and the hub height are calculated approximately 126 m and 158 m, respectively.
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    Modelling of Risk Indicators in a Smart Grid Newtork by Fuzzy Analytic Hierarchy Process
    (Gazi Univ, 2020) Aktas, Ilter Sahin; Menlik, Tayfun; Sozen, Adnan
    In smart grid systems, a comprehensive risk analysis is required to be able to transfer supply of energy continuous and secure. In this study, an advanced, multiple and detailed Risk Assessment Index Framework has been established for a smart grid system. Risks are constituted as Financial, Security, Environmental, Technological and Management Risks. The significance of the risks are determined by using Chang's Fuzzy Analytic Hierarchy Process (BAHP) Method, Enhanced Integral Value and Quadratic Mean Method.
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    Techno-economic feasibility analysis and optimisation of on/off-grid wind-biogas-CHP hybrid energy system for the electrification of university campus: A case study
    (Pergamon-Elsevier Science Ltd, 2024) Aktas, Ilter Sahin
    This paper provides a comprehensive feasibility analysis of a hybrid energy system with different configurations to meet electricity and thermal load demand at the University of Southampton campus. The suggested hybrid energy system (HES) comprises wind turbine, biogas generator, battery, CHP natural gas-generator, thermal load controller, boiler, and converter and is simulated in Homer Pro software. In addition, a comparative analysis between stand-alone and on-grid HES is presented. The results indicate that the grid-connected HES is significantly more cost-effective, with a 45 % reduction in cost of energy (COE) and %15.5 decrease in net present cost (NPC) compared to the off-grid system, which amounts to 0.03359 $/kWh and 467M$, respectively. The gridconnected HES is not only more eco-friendly in terms of greenhouse gas emissions (GHG) and produces 19 % less emissions annually compared to the grid-independent system, but it also effectively achieves a positive return on investment (ROI) of %45 with 2.3 years of payback time. Considering the university's total emissions of 38.56 kT CO2e, the proposed on-grid hybrid system has the potential to lessen GHG emissions by 91.2 %.