Yazar "Hikmet Karakoc T." seçeneğine göre listele

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    Analyzing the hydrogen supply chain for airports: Evaluating environmental impact, cost, sustainability, viability, and safety in various scenarios for implementation
    (Elsevier, 2023) Degirmenci, Hursit; Uludag, Alper; Ekici, Selcuk; Hikmet Karakoc T.
    It is a matter of great concern that the aviation industry, which has made significant contributions to the transportation sector, relies heavily on nonrenewable fossil fuels that are causing substantial pollution, leading to the industry’s unsustainability. To address this issue, the industry has shifted its focus towards sustainable aviation fuels, with hydrogen fuel showing great promise due to its clean and eco-friendly nature. However, the adoption of hydrogen as an energy carrier in aviation presents several challenges, including the lack of a supply chain comparable to that of kerosene, which is currently the primary fuel used in aviation. The supply chain for hydrogen involves various sub-sections such as production, liquefaction, transport, storage, and distribution. This study aims to analyze the hydrogen supply chains for airports and to develop scenarios for its imple mentation. The study evaluates the environmental impact, cost, sustainability, viability, and safety in different supply chain scenarios, as well as recommending a comprehensive approach to supply chain development that involves collaboration between industry, government, and academia.
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    Environmental damage cost and exergoenvironmental evaluations of piston prop aviation engines for the landing and take-off flight phases
    (Elsevier, 2022) Balli, Ozgur; Kale, Utku; Rohács, Dániel; Hikmet Karakoc T.
    This study presents a comprehensive investigation of the environmental damage cost, exergoenvironmental and life cycle assessment (LCA) analyses of four piston prop aviation engines (AE) entitled as AE1, AE2, AE3,and AE4 for different flight conditions. The data of energetic, exergetic, economic, and exergoeconomic as well as emission are firstly given as a briefly. Then, cost formation of environmental damages, LCA, and exergoenvironmental analyses are realized. AE3 has minimum specific environmental damage with 0.0380 $/MJ and the lowest specific exergoenvironmental cost with 0.360 $/MJ for take-off phase. Besides, minimum environmental impact values of engine shaft power are estimated to be 29.33 mPts/MJ for AE1 in taxi phase, 23.93 mPts/MJ for AE3 in take-off phase, 26.36 mPts/MJ for AE1 in climb-out phase, and 25.20 mPts/MJ for AE2 in approach phase. Fuel consumption is main contributor for environmental impact with over 89%. The highest relative environmental differences is occurred in AE4 by 1001.69% for taxi phase while AE1 has minimum exergoenvironmental factor. and AE3 has minimum values of environment impact point costs. As a result, AE3 is the best engine in the perspective of thermodynamically, economically and environmentally.
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    Investigation of energy efficiency strategies in production processes based on operational management
    (Inderscience Publishers, 2023) Ziya Sogut M.; Hikmet Karakoc T.
    This study, investigates the energy efficiency potential of a cement production process based on the operational control approach, which has been developed. In this context, indicators that concern consumption of specific energy users were defined and limit values were determined. Accordingly, energy efficiency potential was found to be 3.5% depending on the control of 122 operational parameters. When the consumption loads of the enterprise are taken into account, the annual savings potential was found to be 4.5 GWh/year of heat energy and 39 GWh/year of electricity. These processes indicated a total of 10, 334.99 tons of CO2 per year. At the end of the study, the contribution of the developed approach to the energy management processes was evaluated. In this respect, in cement production, mill inlet temperatures, secondary temperature, and main drive power emerge as the main operational indicators for energy efficiency for raw mills, rotary kiln, and cement mills, respectively.