Browsing by Author "Neto, Rui C."
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- Conversão de edifícios existentes em nzeb através da integração de energias renováveis, de micro-redes e de soluções de eficiência energéticaPublication . Estanqueiro, Ana; Joyce, A; Aelenei, Laura Elena; Facão, Jorge; Rodrigues, Carlos; Loureiro, David; Teixeira, J.; Correia, J.B.; Ramalho, Álvaro; Camelo, Susana; Silva, Carlos; Neto, Rui C.RESUMO: O Projeto IMPROVEMENT “Integration of combined cooling, heating and power microgrids in zero-energy public buildings under high power quality and continuity of service requirements” é um projeto financiado pelo Programa INTERREG SUDOE, de cariz marcadamente multidisciplinar e que reúne competências da área de integração e modelação de sistemas energéticos, da gestão de energia em edifícios, de energias renováveis, micro-redes inteligentes e sistemas de monitorização e gestão de consumo. Tem ainda como objetivo geral renovar edifícios públicos existentes, convertendo-os em edifícios com necessidades de energia quase nulas (NZEB), e para tal integra micro-redes com fontes renováveis e geração combinada de calor, frio, eletricidade, equipadas com sistemas de armazenamento.
- Modelling and experimenting thermal energy storage through the use of PCM in low thermal inertia officePublication . Abreu, Duarte Drumond de; Neto, Rui C.; Aelenei, Laura Elena; Siva, CarlosABSTRACT: Within the scope of this thesis, thirty DuPont Energain thermal mass boards were tested inside a shipping container located in Oeiras, Portugal. These phase change material (PCM) boards have a 21.7 °C melting point and they were experimented during August (Summer) as internal mass due to a structure specifically designed for this project. Results showed that these latent heat storage systems induced an indoor peak temperatures shift of three hours and a slight indoor temperatures reduction. An EnergyPlus model was validated using measured data and several parametric studies were made using this model. In this case, it was found that the best solution for this low thermal inertia enclosure was incorporating forty eight panels with 10 mm of thickness and a melting point of 20 °C. Although these panels have a payback period of thirty two years, in the future it can fall into a more acceptable value of five years.
- Retrofit measures evaluation considering thermal comfort using building energy simulation : two Lisbon householdsPublication . Gomes, Ricardo; Ferreira, Ana R.; Azevedo, Luís; Neto, Rui C.; Aelenei, Laura Elena; Silva, CarlosABSTRACT: Retrofit measures for buildings are in general evaluated considering the energy savings and life cycle cost. However, one of the main benefits, the increase of users comfort is very seldom analysed. In this work, two residential households representative of a large share of households in Portugal, were monitored and its thermal behavior was modeled using Energy Plus. The thermal evaluation of the pre-retrofit households shows that the winter season is problematic due to construction solutions and low availability for heating. The retrofit measures analysis was performed considering different retrofit solutions regarding envelope improvement and efficient systems implementation. In order to work around the question of comparing households that do not use energy for acclimatization and therefore have very low energy consumption, in the retrofit scenarios it was considered the thermal comfort evaluation value for the real case (pre-retrofit) and compared the energy consumption to achieve that same average comfort level (in this case avoiding high discomfort peaks). The measures that more rapidly pay the investment are those related with implementing active systems. The approach used in this paper, should be used in more calibrated models in order to have overall conclusions about the retrofit process at a larger scale.
- Retrofit measures evaluation considering thermal comfort using building energy simulation: two Lisbon householdsPublication . Gomes, Ricardo; Ferreira, Ana R.; Azevedo, Luís; Neto, Rui C.; Aelenei, Laura Elena; Silva, CarlosABSTRACT: Retrofit measures for buildings are in general evaluated considering the energy savings and life cycle cost. However, one of the main benefits, the increase of users comfort is very seldom analysed. In this work, two residential households representative of a large share of households in Portugal, were monitored and its thermal behavior was modeled using Energy Plus. The thermal evaluation of the pre-retrofit households shows that the winter season is problematic due to construction solutions and low availability for heating. The retrofit measures analysis was performed considering different retrofit solutions regarding envelope improvement and efficient systems implementation. In order to work around the question of comparing households that do not use energy for acclimatization and therefore have very low energy consumption, in the retrofit scenarios it was considered the thermal comfort evaluation value for the real case (pre-retrofit) and compared the energy consumption to achieve that same average comfort level (in this case avoiding high discomfort peaks). The measures that more rapidly pay the investment are those related with implementing active systems. The approach used in this paper, should be used in more calibrated models in order to have overall conclusions about the retrofit process at a larger scale.