Browsing by Author "Aguiar, Ricardo"
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- Uma abordagem espectral à geração de séries correlacionadas de ventoPublication . Aguiar, Ricardo; Estanqueiro, Ana; Saraiva, J. A. Gil
- Climatologia e anos meteorológicos de referência para o Sistema Nacional de Certificação de Edifícios (versão 2013)Publication . Aguiar, Ricardo; Carvalho, Maria João; Goncalves, Helder
- O consumo sustentável como um vector de mitigação das alterações climáticasPublication . Aguiar, Ricardo
- On the effect of the utility grid characteristics in a wind park power output fluctuationsPublication . Estanqueiro, Ana; Aguiar, Ricardo; Saraiva, J. A. Gil; Castro, Rui; Jesus, J.M. Ferreira
- Solar climate of Azores: results of monitoring at Faial and Terceira islandsPublication . Aguiar, Ricardo; Silva, António R.; Coelho, RicardoThe North Atlantic archipelago of Azores (Portugal) consists of nine islands, located about 1,500 km from mainland Europe. Currently the Azores has about 243,000 inhabitants, which depend heavily on imported fossil fuel for their energy supply. This is a concern for the regional Government and its Agency for Energy and Environment, ARENA, which naturally support energy efficiency and use of renewable energies. The Azores are rich in several renewable resources, and have even pioneered Portuguese exploitation of wind, wave, and high enthalpy geothermal energy for electricity generation. However, so far solar energy has not been a priority in the renewable energy panorama, probably because the Azores climate has been considered too cloudy. Nevertheless, this is true only in comparison with the Portuguese mainland, as the radiation levels are probably similar or even better than those of Northern Europe. In this context ARENA is developing efforts for increasing the use of solar systems. A collaboration, partly financed by an INTERREG III B Project of the European Community, has been established with INETI, the Portuguese Public Laboratory for the area of Energy, to improve the solar climatology of the Azores. This climatology is indeed quite incomplete. It consists mainly on daily measurements for two sites only at the S. Miguel and Terceira islands. Some sunshine records are available from Campbell-Stokes heliographs. Satellite data exists but their quality is uncertain due to the small size of the islands and the shallow view angle.
- The development and application of a model for power output in a wind parkPublication . Estanqueiro, Ana; Aguiar, Ricardo; Saraiva, J. A. Gil; Castro, Rui; Jesus, J.M. Ferreira
- The hydrogen roadmap in the Portuguese energy system : developing the P2G casePublication . Cabrita, Isabel; Partidário, Paulo Jorge; Aguiar, Ricardo; Martins, Paulo; Rangel, C. M.ABSTRACT: The energy transition towards a decarbonized, energy secure and more sustainable economy is providing driving forces for significant challenges and opportunities on a country basis. It has been extensively argued elsewhere, that hydrogen (H2) is an energy vector having a strategic role in the energy transition as it enables to add value to the system, namely by: (i) Enhancing the flexibility of the energy system, through energy storage, service to multiple sources of demand and sector coupling based on power and gas grids; (ii) Integrating variable and intermittent renewable energy inputs in the National energy mix; (iii) Contributing to a holistic and innovation-oriented ecosystem.
- The hydrogen roadmap in the Portuguese energy system : developing the P2G casePublication . Partidário, Paulo Jorge; Aguiar, Ricardo; Martins, Paulo; Rangel, C. M.; Cabrita, IsabelABSTRACT: The planning and implementation of the Portuguese energy transition towards a decarbonized, energy secure and more sustainable economy is providing driving forces for significant challenges and opportunities on a country basis. The emergence of hydrogen (H2) within low-carbon pathways in the energy system requires to deal with the complexity of H2 carrier in its relationship with energy sources and end use sectors. In the frame of mainland Portugal energy system, different value chain configurations were analysed and assessed using energy analysis, lifecycle thinking and impacts assessment, as well as the technology and costs analysis, within an approach to the Hydrogen Economy. The Portuguese Roadmap for H2 was developed taking such an approach and therein the evolution of the selected value chains along time. Among these, ‘power-to-gas’ (P2G) combined with the gas grid is given an in-depth focus, as it was prioritized as the top value chain to answer the research question: how sustainable would be the hydrogen production and end use in Portugal within the P2G value chain? This P2G value chain with a particular focus on heating applications is discussed on the basis of the technology options and technology maturity identified in each main stage of the value chain, using analytical dimensions such as the energy efficiency and greenhouse gas emissions, among other impact categories, followed by a sensitivity analysis. The obtained results enable to show how case-sensitive that approach is and that a multi-decisional process is required to assist the planning stage.
- The influence of transmission system disturbances on the dynamic behaviour of a wind parkPublication . Castro, Rui; Jesus, J.M. Ferreira; Estanqueiro, Ana; Aguiar, Ricardo; Saraiva, J. A. GilIn this paper an integrated non-linear model of both the wind park and the interconnecction network is presented. The model is an integartion of model previously developed for each componenet of the system, namely wind turbines, induction generators, reactive power compensation system, transformers, feeder and possible local loads connected to the feeder. In order to draw some conclusions regarding the interaction between wind parks and the existing a.c. system, some case studies have been performed using the developed models.