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ESTGV - DEM - Documentos de congressos (comunicações, posters, actas)

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Browsing ESTGV - DEM - Documentos de congressos (comunicações, posters, actas) by Author "Cruz-Lopes, Luísa"

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  • Environmental profile of the electricity supplied in Portugal by the main suppliers
    Publication . Ferreira, José; Esteves, Bruno; Cruz-Lopes, Luísa; Domingos, Idalina
    The main aim of this study was to assess and compare the environmental profile of 1 KWh of electricity supplied during 2014 by the four main electricity selling companies in Continental Portugal. The study was elaborated based on Life Cycle Assessment methodology and the method chosen for environmental impact assessment was EPD2013. The results show that the ENDESA´s electricity was the worst in terms of acidification, eutrophication, global warming, photochemical oxidation and ozone layer depletion while IBERDROLA´s electricity was the best for those impact categories and the worst in terms of abiotic depletion. Including in the study, the net electricity fed into the Portuguese and UCTE grid at the high voltage level, the conclusion is that the electricity at Portuguese grid presents the worst performance in terms of acidification, global warming and photochemical oxidation while the electricity at UCTE grid presents the worst performance in terms of eutrophication and ozone layer depletion.
    2016Conference object Open access Show more
  • Increase of calorific value of two important feedstocks by mild torrefaction
    Publication . Domingos, Idalina; Ferreira, José; Cruz-Lopes, Luísa; Esteves, Bruno
    In the last decades efforts have been made to replace fossil fuels by more sustainable feedstocks for the production of energy. A way to increase the travelable distance of this feedstock is to increase its energy content. The objective of this work was to study the increase in the calorific value of two of the most important wood species in the central region of Portugal, a softwood, (Pinus pinaster Ait) and a hardwood (Eucalyptus globulus Labill.), by mild torrefaction. The treatment was made in an oven during 2 -24 hours and temperatures from 170ºC to 190ºC. Calorific value and insoluble lignin were determined. Results show that there is an increase in the HHV (High Heating Value) of both pine and eucalypt samples (higher in eucalypt) and that the increase is higher for higher treatment times. A good correlation between the amount of lignin and the HHV was found.
    2016Conference object Open access Show more