Navegando por Assunto "Rendimento global"

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Acesso aberto (Open Access)
Avaliação de desempenho operacional de microgeração e minigeração solar fotovoltaica em edificação comercial, industrial, residencial e pública no Estado do Pará
(Universidade Federal do Pará, 2022-11-18) MONTEIRO, Weslley Leão; MACÊDO, Wilson Negrão; http://lattes.cnpq.br/3386249951714088
This work evaluates the operational performance of different Photovoltaic Systems Connected to the Electric Grid, installed in 5 (five) consumer units, four in the metropolitan region of Belém/PA and one in Santarém/PA, consumption class: Residential, Commercial, Industrial and Public, in order to contribute to the construction of scientific knowledge and make public performance values of photovoltaic generators connected to the conventional grid in the North region of the country. For this, the electricity production data provided by the online monitoring platform of the grid connection inverter of each SFCR, in the years 2019 to 2021, was considered for the calculation of the merit indexes. monitoring, the data presented on the inverter display was considered. To calculate the final yield (YF) of two systems, the value of the real power of the photovoltaic generator was considered through I-V curve tests carried out in real sun with a curve tracer (Solar IVe) provided by GEDAE/UFPA, considering measurements performed in an arrangement of a subsystem. For the estimated performance ratio calculation, the Meteonorm v8.0 database was considered to obtain irradiation in the GFV plane. The results obtained in this work allow comparing the estimated global performance of the systems, making it evident that the operational results are directly related to the solution implemented in each system, to good practices during installations, and the importance of a more rigorous and continuous control of the SFCR monitoring.
Acesso aberto (Open Access)
Obtenção do óleo e da polpa sem gordura do açaí (euterpe oleracea) por extração supercrítica: caracterização físico-química, estudo da citotoxicidade e vida de prateleira
(Universidade Federal do Pará, 2025-01-06) SIQUEIRA, Letícia Maria Martins; BRASIL, Davi do Socorro Barros; http://lattes.cnpq.br/0931007460545219; https://orcid.org/0000-0002-1461-7306; CARVALHO JÚNIOR, Raul Nunes de; http://lattes.cnpq.br/5544305606838748; https://orcid.org/0000-0002-4433-6580
Açaí is a very important product for the development of the state of Pará, for the bioeconomy and the market has been growing. And currently the majority of the state’s production is just fruit pulp, hence the importance of new products with added value and the need to invest in new sustainable processes for the region’s development. Therefore, the objective of this work was to obtain the oil and pulp without açaí fat by supercritical extraction, determine the main bioactive compounds, evaluate the possible cytotoxicity in MRC-5 and VERO cells in vitro and evaluate the shelf life of the products. The freezedried açaí pulp was subjected to extraction with supercritical CO2, under the conditions 323,15 K at 35 MPa, 333,15 K at 42 MPa and 343,15 K at 49 MPa. The highest yield (51,74 %), carotenoids (277,09 μg/g), DPPH (2,55 μmol TE/g), ABTS (2,60 μmol TE/g) and FRAP (15,25 μm ferrous sulfate/g) from oil and ABTS (644,23 μmol TE/g) from pulp without fat were found at 343,15 K at 49 MPa condition. The highest contents of phenolic compounds (150,20 mg GAE/g d.b.), DPPH (414,99 μmol TE/g d.b.) and FRAP (746,2 μm ferrous sulfate/g) from pulp without fat were found at 323,15 K at 35 MPa condition. The pulp without fat presented high levels of anthocyanins without significant variation. The products did not present cytotoxicity. The half-life of the freeze-dried pulp and the fat-free pulp in the presence of light (Becker) was shorter than that of the packaging materials. The sealed packaging achieved a longer half-life compared to vacuum-sealed packaging for the freeze-dried pulp. However, for the fat-free pulp, the vacuum-sealed packaging showed a longer half-life compared to the sealed one. The results of the stability of açaí oil qualify it as a table oil rather than a frying oil, as it degrades more rapidly at higher temperatures. The results demonstrated that the products have potential applications in the industry.