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Navegando por Autor "Rufino, Cleydson Tiago Ferreira"

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    Economic viability analysis of CSP technology in the state of Rio Grande do Norte
    (Universidade Federal do Rio Grande do Norte, 2019-05-31) Rufino, Cleydson Tiago Ferreira; Tapia, Gabriel Ivan Medina; Bessa, Kleiber Lima de; Carvalho, Zulmara Virgínia de
    This work presents an economic viability analysis of the installation of solar power plants with Concentrating Solar Power (CSP) for the cities of Assú, Caicó and Mossoró of the state of Rio Grande do Norte in Brazil. The cities chosen have normal direct irradiation above 2,000 kWh/m²/year. The System Advisor Model (SAM) software was used for the simulations. In the analysis have been considered that there is or there is not Thermal Energy Systems (TES). The CSP plants analyzed have been of Parabolic Trough Collector (PTC) technology with dry cooling system without TES and with TES, PTC plants with wet cooling without TES and with TES, Central Receiver System (CRS) technology with dry cooling without TES and with TES and CRS with wet cooling without TES and with TES. The parameters Levelized Cost of Electricity (LCOE), which is the price per kWh of the electric power generated at the plant, and the Solar Multiple (SM), which relates the solar generation with the power generation of the plant, were analyzed. According to the results found, Caicó and Mossoró had better conditions of CSP installation in relation to Assú, however Caicó, does not yet have enough Sistema Interligado Nacional infrastructure to receive CSP plants.
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    Estudos energético, exergético, exergoeconômico e exergoambiental (4E) de um Sistema de Produção de Hidrogênio Verde com Células de Eletrólise de Óxido Sólido (SOEC)
    (Universidade Federal do Rio Grande do Norte, 2025-01-17) Rufino, Cleydson Tiago Ferreira; Cavalcanti, Eduardo José Cidade; Lima, Álvaro Augusto Soares; http://lattes.cnpq.br/4673751198892295; https://orcid.org/0000-0002-6880-0122; http://lattes.cnpq.br/3935651748470976; Carvalho, Mônica; Macedo, Thiago de Oliveira
    Increased global energy demand and the use of fossil fuels are factors that are driving global warming. Reducing greenhouse gas emissions and using clean energy sources develop economies and global energy security. Using green hydrogen as an energy vector is one of the actions aimed at decarbonizing the planet. Electrolyzer cells are the most widely used worldwide to produce hydrogen from water. The solid oxide electrolysis cell (SOEC) has the highest energy conversion efficiency among electrolysis cells. This fact is due to the lower electrical energy consumption since the operating temperature range is between 600 and 1200°C. The general objective of this dissertation is to perform the energetic, exergy, exergoeconomic, and exergoenvironmental (4E) analysis of a green hydrogen production system with SOEC. The model assumptions were 60 electrolyzer modules in parallel, the cell operates at 950°C with a current density of 2500 A/m². The molten salt storage system and batteries allow the cells to operate for 10 hours. The result is a production capacity of 1.88 kg/h of hydrogen per module. Each module consumes 19.77 kg/h of water. The solar field supplies the system with a constant heat rate of 565 kW, and 3307 heliostats. 163 photovoltaic panels and 83 batteries provide a rate of 52.55 kW of electricity for each module. The operating voltage of the SOEC is 1.043 V. The largest relative error of the model was 2.76%. The lowest exergy efficiencies were in the photovoltaic system and batteries, at 18.06%, and in heat exchanger #1, at 24.14%. The energy and exergy efficiencies of SOEC were greater than 100%. The total cost of acquiring the equipment was MUS$ 22.81. The solar tower and heliostats had the highest cost of the system, being equal to MUS$ 13.40. The LCOH of the system was equal to US$8.40/kg. The cost of the hydrogen produced is US$46.08/GJ. The component with the worst performance from an exergoeconomic point of view was the photovoltaic panels with batteries with the highest exergy destruction rate of US$ 22.93/h and an exergoeconomic factor of 18.07%. The component with the greatest potential for improvement with the least effort is the solar tower and heliostat field, whose relative cost difference is 4686.42. From an exergoenvironmental point of view, the worst component was the photovoltaic panels and batteries, having the greatest environmental impact on the system, the highest rate of environmental impact of the destroyed exergy, and a low exergoenvironmental factor. The solar tower and heliostats presented a high exergoenvironmental factor, with the greatest relative difference in environmental impact.
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