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[en] Experience in optimal synthesis of individual vehicle components and mechanisms on the basis of additive technology is analyzed. A list of basic additive technologies is presented. The benefits of additive technology in combination with three-dimensional computer simulation are noted. The possibility of visualizing CAE calculations by means of additive technology is considered. In addition, the role of additive technology in the manufacture of individual vehicle components and mechanisms is discussed.
[en] Wind energy is an important field of development for the island of Gotland, Sweden, especially since the island has set targets to generate 100% of its energy from renewable sources by 2025. Due to the variability of wind conditions, energy storage will be an important technology to facilitate the continued development of wind energy on Gotland and ensure a stable and secure supply of electricity. In this study, the feasibility of utilizing the Middle Cambrian Faludden sandstone reservoir on Gotland for Compressed Air Energy Storage (CAES) is assessed. Firstly, a characterization of the sandstone beneath Gotland is presented, which includes detailed maps of reservoir thickness and top reservoir structure. Analysis of this information shows that the properties of the Faludden sandstone and associated cap rock appear favorable for the application of CAES. Seven structural closures are identified below the eastern and southern parts of Gotland, which could potentially be utilized for CAES. Scoping estimates of the energy storage capacity and flow rate for these closures within the Faludden sandstone show that industrial scale CAES could be possible on Gotland.
[en] In recent years, studying on energy production processes has been more popular by the sharp increasing trend of energy consumption and loss. One of the effective ways considered for energy loss avoidance in power generation system is using heat loss of power cycles to provide demanded heat for industrial units. Employing auxiliary cycles and compressed air energy system alongside main power production cycle improves the produced power and performance of combined heat and power systems. In this study, a novel combined heat and power system with Brayton cycle as the main power production unit using wind renewable energy, compressed air energy system, and Rankine and organic Rankine cycles is proposed and simulated for residential approaches. All parts of model are validated via the previous published researches and the performance of proposed system in different operating conditions is investigated in detail energetically and exergetically. Results show the acceptable performance of proposed system in peak times as well as low load hours. The increase of gas turbine expansion ratio brings more first and second law efficiencies, while more irreversibility is created by compressor compression ratio increase. In addition, produced power and irreversibility have linear trend by inlet air mass flow rate beside no change in the first and second law efficiencies. Demanded mass flow rate of fuel, Rankine, organic Rankine cycle, and heating system are directly affected by inlet air mass flow rate and overall thermal efficiency can be increased by simultaneous turbine and compressor pressure ratio increase.
[en] Storing electricity is undoubtedly a major worldwide issue in the energy transition, since it is indispensable for uploading electricity from intermittent renewables (wind power and photovoltaics) to the grid. The value of storing electricity is related to the services obtained, especially in areas where the grid is insufficient. The centralization of hydroelectricity - still, by far, the prevailing technology - keeps it from satisfying all needs. The rapidly lowering cost of lithium-ion batteries represents an opportunity, especially for transportation, electricity grids and, to a lesser extent, consumers who produce their own current. Battery storage can compete with others forms of technology or services for managing flexibility: steering demand (load management), storing heat, etc. For mainland France, it would be utopian to imagine an electricity mix based only on hydro, wind and photovoltaic power and the storage of electricity, since its cost would soar within a foreseeable period of time. (authors)
[fr]Au niveau mondial, le stockage de l'electricite est sans aucun doute l'un des defis majeurs de la transition energetique, car il est indispensable a l'integration dans le systeme electrique des energies renouvelables intermittentes (EnRi), l'eolien et le photovoltaique. La valeur du stockage d'electricite est liee aux differents services qu'il peut rendre, particulierement dans les zones ou le reseau est insuffisant. L'hydraulique est encore, de tres loin, la technologie predominante, mais elle est centralisee, ce qui ne permet pas de repondre a tous les besoins. La baisse rapide des couts des batteries Li-Ion est une opportunite, notamment pour la mobilite et pour differents services aux reseaux electriques et, dans une faible mesure, aux auto-consommateurs. Le stockage par batterie peut etre en competition avec d'autres technologies ou services permettant de gerer la flexibilite: pilotage de la demande (effacements), stockage de chaleur, etc. En ce qui concerne la France metropolitaine, un mix electrique compose uniquement d'hydraulique, d'eolien, de photovoltaique et de stockage parait utopique, tant son cout serait enorme a un horizon de temps previsible. (auteurs)