Yazar "Karayel, G. Kubilay" seçeneğine göre listele

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    A comprehensive assessment of energy storage options for green hydrogen
    (Pergamon-Elsevier Science Ltd, 2023) Karayel, G. Kubilay; Javani, Nader; Dincer, Ibrahim
    The current study investigates suitable hydrogen storage technologies for hydrogen produced by renewable energy resources in a green manner. Type-I, III, and IV high-pressure tanks, adsorbent storage, metal hydride storage and chemical storage options are investigated and compared based on their hydrogen storage capacities, costs, masses and greenhouse gas (GHG) emissions. The results of this study show that in a Type-IV hydrogen storage tank (i.e., composite material tank of carbon fiber with thermoplastic polymer liners), increasing the tank pressure from 100 bar to 800 bar increases the hydrogen holding capacity by 457.7%. Regarding the environmental impact, the lowest GHG emissions appear to be the lowest for liquid hydrogen storage with an average of 3.5 CO2eq/kg-H2 while the respective emissions become the highest in metal hydride storage tanks as 113.6 CO2eq/kg-H2. Furthermore, hydrogen storage capacity for Type-IV tanks varies from 1.94 kg at 100 bar to 15.69 kg at 1500 bar in a 250 L tank. In chemical hydride storage tanks, the stored H2 mass will be 40.75 kg for 100 L, 128.39 kg for 200 L, 216.03 kg for 300 L, 303.67 kg for 400 L, 391.31 kg for 500 L and 478.96 kg for 600 L, respectively. Moreover, hydrogen storage, distribution and dispensing are considered critically important in hydrogen logistics and the results of this study will help better guide policymakers to establish effective policies and increase renewable energy penetration in the energy market.
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    Utilization of biomass and waste resources for renewable hydrogen production: A comprehensive study
    (Taylor & Francis Inc, 2023) Karayel, G. Kubilay; Javani, Nader; Dincer, Ibrahim
    The current study investigates the biomass and waste-based potential for green hydrogen production in Turkey. The biomass sources are identified based on the collection of municipal, industrial, animal, agricultural, and forestry wastes. The potential of each city is estimated and discussed for a feasible hydrogen economy. Using the legitimate government data obtained from the governmental sources, the capacities of the available biomass potential for different cities in tons of oil equivalent are considered annually for the analysis and assessment. The power production is considered through using gasification and incineration systems, where the final product is hydrogen. The main idea is to prepare hydrogen maps in detail for each region in Turkey, based on the biomass energy potential through employing the gasification and incineration approaches. The results show that Turkey's total green hydrogen production potential using available biomass resources is about 1.66 megatons/year. Konya, Adana, Ankara, Sanliurfa, and Manisa are listed as cities with the highest green hydrogen production potential with an annual production of 129.53, 78.82, 64.42, 64.2, and 53.63 kilotons, respectively. The results of the study are expected to help policymakers to use renewable energies for planning and strategizing new local and global acts for the country and help to tackle fossil-fuel-based issues. This, in turn, can be considered in the context of the current policies of the local communities to supply the required energy.