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Characterization and application of a selective coating for solar collectors fr...
Pinho, Diego Caitano; Freire, Francisco Nivaldo Aguiar; Araújo, Felipe Alves Albuquerque; Dutra, Kaio Hemerson; Teixeira, Edwalder SilvaSolar energy is the most promising energy source, due to its great availability and applicability in thermal energy appli- cations. However, researchers still experience technological and economical challenge, since many systems that use this energy still have low efficiency and high cost. In this way, the development of new materials and technologies to increase the efficiency of solar thermal collectors is bo...
Study of surfaces, produced with the use of granite and titanium, for applicati...
Araújo, Felipe Alves Albuquerque; Freire, Francisco Nivaldo Aguiar; Pinho, Diego Caitano; Dutra, Kaio Hemerson; Rocha, Paulo Alexandre CostaThe present work consisted in obtaining and studying selective surfaces for applications in low-cost flat plate solar collectors, using residues from the granite in dustry. Five different surfaces were studied, varying the percentage by weight: 100% granite powder, 75% granite powder + 25% titanium oxide, 50% granite powder + 50% titanium oxide, 25% granite powder + 75% titanium oxide and 100% titanium oxide. F...
Degradação rápida de folhas de policarbonato
Lima, Francisco Marcone; Martins, Felipe Mota; Nascimento, João Paulo Costa do; Maia Júnior, Paulo Herbert França; Almeida, Ana Fabíola LeiteThe thermal degradation of polycarbonate sheets was made from water-sodium hydroxide solution by spray pyrolysis. It was created a vacuum within nozzle for provides the spray. The material, before and after of the thermal degradation, were characterized by photoluminescence spectroscopy, scanning electron microscopy and X-ray fluorescence. Polycarbonate sheets, before and after of the thermal degradation, when ...
Modelo teórico relacionando as potências elétrica e química em célula fotossens...
Lima, Francisco Marcone; Bezerra, Karine Pereira; Marques, Maria Katiane Diógenes; Júnior, Paulo Herbert França Maia; Freire, Francisco Nivaldo AguiarThis paper presents a theoretical model relating the electrical power to the chemical power in a photosensitized dye-cell. The same is based on the junction of present concepts of chemical potential models and chemical power. Thus, from these two considerations is possible to perform tests under various physical and environmental conditions during the solar conversion process. Consequently, the proposed theoret...
Characterization of a selective surface based on chromium, iron and aluminum ox...
Dutra, Kaio Hemerson; Freire, Francisco Nivaldo Aguiar; Pinho, Diego Caitano; Araújo, Felipe Alves AlbuquerqueThe depletion of conventional energy sources and the concern with the environmental impacts of the use of fossil fuels sparked interest in researching new energy sources and improving existing processes. In this context, the solar energy presents itself as one of the most promising energy sources on the planet, given its wide availability and applicability in thermal processes. However, its use still represents...
Pani addition to improve contact between CdTe/CdS semiconductors
Júnior, Paulo Herbert França Maia; Almeida, Ana Fabíola Leite; Moreira, Raquele Lima; Teixera, Edwalder Silva; Nunes, Vanja FonteneleThis paper presents the study of the addition of the polyaniline polymer (PANI), at the junction of the cadmium telluride and cadmium sulfide (CdTe/CdS) layers in order to improve the contact between the layers, to decrease the air gap that limit the conversion photovoltaic. The morphology of CdS, CdTe and polyaniline (PANI) were characterized with multiple techniques including scanning electron microscopy (SEM...
Building and testing a spin coater for the deposition of thin films on DSSCs
Teixeira, Edwalder Silva; Cavalcanti, Raphael Coelho; Nunes, Vanja Fontenele; Júnior, Paulo Herbert França Maia; Lima, Francisco MarconeA low cost spin coater was constructed in this work for the deposition of thin films of titanium dioxide (TiO2) on conductive substrate of FTO (fluoride doped tin oxide) with application on dye sensitized solar cells. The results showed a 95% precision between the speed values obtained by the software of C#sharp language and the spin values observed directly on the device. The TiO2 films deposited through the s...
Use of SnOx: F in the Recycling of Silicon Solar Cells
Lima, Francisco Marcone; Alves, Jean Faber Araújo; Júnior, Paulo Herbert França Maia; Martins, Felipe Mota; Teixeira, Edwalder SilvaAmongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric conductors. The broken silicon cells were analyzed by the...
Silicon dioxide extraction from cashew nut ashes
Martins, Felipe Mota; Alencar, Francisco Klayton Marques de; Freire, Francisco Nivaldo Aguiar; Sena, Aline Cosmo de; Rocha, Hélio Henrique BarbosaAfter the cashew nuts processing, the husks rich in silicon are used as fuel in boilers where they are burned at temperatures above 1000 °C. In this study, it was investigated a form of silicon extraction from the ashes taken from the boiler using a chemical route. At first, the ashes were bathed with an aqua regia solution (+ 3), then it were bathed with sulfuric acid (4) and taken to the oven at 600 °C for tw...
Análises bibliométricas aplicadas ao estudo da secagem solar de alimentos
Menezes, Victor Augusto Cavalcante Bezerra; Graça, Manuel Pedro Fernandes; Freire, Francisco Nivaldo Aguiar; Maia Júnior, Paulo Herbert FrançaAnálises bibliométricas são bastante úteis quando se deseja evidenciarrelações existentes entre diversas publicações que tratamde umdeterminado assunto(do mais abrangente ao mais específico).As análises podem ser de diversos tipos, tais como de citação e co-citação, easrelaçõespodem ser estabelecidas tendo como base unidades de análisetais comoautores, organizações (centros de pesquisa e universidades), países ...