Browsing by Issue Date, starting with "2009-04"
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- Corrosion inhibition of copper rich Al alloys: layered double hydroxidesPublication . Travassos, Maria Antónia; Rangel, C. M.
- A first methodology for wind energy resource assessment in urbanised areas in PortugalPublication . Simões, Teresa; Costa, Paula Silva; Estanqueiro, AnaThe onshore wind power capacity in Portugal has increased very rapidly in the last five years and this high rate of development is expected to continue up to 2013 although at a slower rate. By then almost all sustainable onshore resource assessment will be deployed. Nevertheless, the full exploitation of the wind resource in Portugal offers other possibilities, among them the installation of small wind turbines (SWT), namely micro-turbines for domestic use in urban and constructed environments. To contribute to the needs of developers, investors and the overall population’s expectations and needs into this newer type of renewable market, a new a new line of research related to the wind resource assessment in urban and constructed areas was initiated. The present work presents a first user-friendly method to assess the urban wind potential at low experimental and computational costs, compatible with the scale of investment of micro-generation. A case study, where an urban area is identified and treated as very complex topography, was characterized in terms of wind resource, being the preliminary results presented here.
- Towards a strategy to zero energy buildings (ZEB) conceptPublication . Goncalves, HelderThe energy consumption in buildings and the need for its reduction has been since the late 60’s and 70ś a main question among professionals (designer, architects, and engineers), legislators and users around the word. Reduction in energy demand for heating for instance was implemented in the so called Solar Buildings (with reduction of 70 to 80% in the heating demand). The building regulation start putting targets, in the overall annual energy consumption xx kWh/m2 year, and some achieve the level of standards, imposing very low values, such as Passivhaus standard which fundamentally consists of an energy limit (net useful energy demand for heating of 15 kWh/m²/year and a total primary energy consumption of 120 kWh/m²/year). Now we are dealing for a new concept, in which those values approach zero (ZEB) or even minus, which correspond to building which produce more than what they spend (ENERGY PLUS BUILDINGS). This paper discusses some of the main issues regarding the strategy to achieve some of these goals in the future.
- Deep water properties in the North Atlantic's eastern and western basins during the Mid-Brunhes (330-630 ka)Publication . Voelker, Antje H. L.; Lebreiro, Susana
- Arrefecimento exsicante-evaporativo assistido por energia solar: Resultados obtidos com a UTA instalada no DER/INETIPublication . Macau, J.; Ferreira, Pedro; Rodrigues, R.; Mendes, J. FarinhaO Departamento de Energias Renováveis do INETI tem em funcionamento, desde 1999 uma UTA - Unidade de Tratamento de Ar que foi instalada no âmbito de um projecto Europeu (CODEC Project) para demonstração da tecnologia exsicante-evaporativa assistida por energia solar. Recentemente foram introduzidas alterações na configuração da UTA, como seja a introdução de um humidificador na secção de admissão de ar com a subsequente modificação do esquema de controlo, desde o Verão de 2008, para, sem sacrificar as condições de conforto, limitar o tempo de funcionamento da bomba de calor que dá apoio ao sistema quando em modo de arrefecimento. Para além da descrição dos componentes principais, modos de operação e alterações introduzidas, neste trabalho são apresentados e analisados os resultados obtidos nesta nova fase de funcionamento da UTA, depois da introdução daquelas modificações, para concluir acerca do interesse da solução adoptada.
- Precipitation Maxima and upwelling trends at the NAO Southern Pole during the last milleniumPublication . Abrantes, Fátima; Rodrigues, Teresa; Montanari, B.; Santos, Célia Teresa; Voelker, Antje H. L.; Lopes, Cristina Isabel
- Tectonic control and mass-wasting processes along S. Vicente Canyon (SW Iberia) : evidences from multibeam bathymetry and seismic reflection dataPublication . Valadares, Vasco; Roque, Ana Cristina; Terrinha, Pedro
- Evidence of intraplate deformation in the West Madeira Abyssal Plain (eastern North Atlantic) from seismic reflection and multibeam swalth bathymetry dataPublication . Roque, Ana Cristina; Simões, M.; Lourenço, Nuno; Abreu, M. Pinto de
- From Summer cooling to sustainable Summer comfort in buiding thermal regulationPublication . Camelo, Susana; Goncalves, Helder; Richard, Mathieu; Laia, CarlosThe introduction of the “Energy Performance Building Directive” (EPBD) [1] and consequently the new National Building Regulation [2] in the Member States (MS) lead to a totally new legal situation concerning, requirements and procedures on the building sector. Under the scope of an EU project called Keep Cool, a survey was undertaken in order to review the energy efficiency criteria, in the national building codes, concerning summer comfort or mechanical cooling system in order to elaborate recommendations towards a sustainable summer comfort. This paper presents the results of this survey [3] carried out under the participate countries (7 countries), and the main goals were the following to update the information regarding the new national building regulations to have a first insight regarding the requirements and summer calculations adopted in each country and to identify the positive and the negative aspects of the different regulations and selection of the best practice examples, in order to draw up recommendations for introducing sustainable summer comfort measures into future national building codes. A comparative analysis has started with some very precise answers and had permitted to carry out a comparative analysis between some national building codes. A review was undertaken concerning envelope constructive solutions (opaque and transparent), thermal mass, ventilation rates and the corresponding values limits.
- Uranium in surface soils : an easy & quick assay combining X-Ray diffraction and X-Ray fluorescence qualitative dataPublication . Figueiredo, M. Ondina; Silva, Teresa; Batista, Maria Joao; Leote, Jaime; Ferreira, M. L.; Limpo, V.
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