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- CSP technology developments and cost reduction: Innovative heat storage and desalination: Cogeneration simulationsPublication . Casimiro, Sergio; Cardoso, João P.; Mendes, J. Farinha
- Dye assessment in nanostructured TiO2 sensitized films by microprobe techniques [Poster]Publication . Barreiros, M. Alexandra; Mascarenhas, João; Corregidor, V.; Alves, L. C.; Guimarães, Fernanda; Torres, Erica; Brites, Maria JoãoDye sensitized solar cells (DSCs) have received considerable attention once this technology offers economic and environmental advantages over conventional photovoltaic (PV) devices. The PV performance of a DSC relies on the characteristics of its photoanode, which typically consists of a nanocrystalline porous TiO2 film, enabled with a large adsorptive surface area. Dye molecules that capture photons from light during device operation are attached to the film nanoparticles. The effective loading of the dye in the TiO2 electrode is of utmost importance for controlling and optimizing solar cell parameters. Relatively few methods are known today for quantitative evaluation of the total dye adsorbed on the film. In this work, a new approach combining microprobe techniques namely, Ion Beam Analytical (IBA) techniques using a micro-ion beam (Rutherford Backscattering Spectrometry (RBS) and Particle Induced X-ray Emission (PIXE)) and Electron Probe Micro-Analysis (EPMA) was carried out to assess dye distribution and depth profile in TiO2 films and the dye load based on Ru/Ti mass ratio. Different 1D nanostructured TiO2 films were prepared, morphologically characterised by SEM, sensitized and analysed by the referred techniques. Dye load evaluation in different TiO2 films by three different techniques (PIXE, RBS and EPMA/ wavelength dispersive spectrometry (WDS)) provided similar results of Ru/Ti mass fraction ratio. Moreover, it was possible to assess dye surface distribution and its depth profile, by means of Ru signal, and to visualise the dye distribution in sample cross-section through X-ray mapping by EPMA/ energy dispersive spectrometry (EDS). PIXE maps of Ru and Ti indicated an homogeneous surface distribution. The assessment of ruthenium depth profile by RBS showed that some films have homogeneous Ru depth distribution while others present different Ru concentration in the top layer (2 ìm thickness). These results are consistent with the EPMA/EDS maps obtained. EPMA (WDS and EDS) together with IBA techniques proved to be powerful tools for functional materials characterisation and provided very promising results in the study of nanostructured TiO2 sensitized films.
- HeatTracer : a Monte Carlo radiative heat transfer tool for cavity receivers simulationPublication . Cardoso, João P.; Mendes, Luís Filipe; Mendes, J. Farinha
- Modeling Multi Effect Distillation powered by CSP in TRNSYS: Case Study using System Advisor Model (SAM): San Diego, CAPublication . Casimiro, Sergio; Cardoso, João P.; Alarcón-Padilla, Diego-César; Turchi, Craig; Ioakimidis, C.; Mendes, J. Farinha
- Recuperação Ecológica de Pedreiras no Parque Natural da ArrábidaPublication . Rodrigues, Fátima; Santos, I.; Loureiro, David; Monteiro, C.; Madeira, G.Entende-se por recuperação ecológica o processo de auxílio ao restabelecimento de um ecossistema que foi degradado, danificado ou destruído,devendo-se assumir a conservação da sua biodiversidade de modo a garantir a possibilidade de retorno à sua trajectória histórica ou à desejada, tornando-o auto-sustentável. É neste contexto, que foram seleccionadas 2 pedreiras do núcleo Achada e Calhariz, das 11 licenciadas no Parque Natural da Arrábida (PNA), onde foram implementados, nas áreas já exploradas, os Planos Ambientais e de Recuperação Paisagística (PARP). No sentido de incentivar a implementação desses planos foi celebrado, em regime de parceria, um protocolo com o objectivo de produção de plantas autóctones (1999-2006) que envolveu a EDP, o INETI (actualmente LNEG), o PNA e os municípios de Setúbal e Palmela. Este protocolo resultou do desenvolvimento do projecto “Valorização de Efluentes Térmicos em Agricultura Protegida”, o qual deu origem à Estação de Propagação de Plantas Autóctones (EPPA) na Central Termoeléctrica de Setúbal (CTS), onde se produziram espécies vegetais autóctones e algumas com estatuto de protecção, que foram utilizadas neste núcleo e em outros planos de outras áreas protegidas e em locais de intervenção do grupo EDP. As espécies para a recuperação, das áreas já exploradas destas pedreiras, foram seleccionadas pelo PNA de acordo com os habitats pré-existentes e que ocorrem nas áreas envolventes para plantação entre 2001-2004 e monitorizadas desde então.
- The contribution of Portuguese solar thermal program on the country energy efficiencyPublication . Salgueiro, Andreia; Mendes, J. FarinhaThe solar radiation available all over the year is a strong reason to promote the utilization of this resource and during the year 2009, a new program based on a 50% subside, was promoted by the Portuguese government. As expected, a significant number of new installations were realized. In 2009 the state program provided the installation of more than 50,000 systems. The program can be considered a success on the Portuguese solar thermal collector market.