2 resultados para Nearly zero energy buildings
em RCAAP - Reposit
Resumo:
Os edifcios de balano energtico nulo (NZEB - Net-Zero Energy Building) e/ou quase nulo (nZEB), tm vindo a ganhar crescente ateno desde a publicao da diretiva europeia 2010/31/EU [15]. Em Portugal, com a introduo do Decreto-Lei n.118/2013, d o primeiro passo para os edifcios com necessidades quase nulas de energia. Os novos edifcios licenciados aps 31 dezembro de 2020, ou aps 31 de dezembro de 2018 no caso de edifcios pblicos, sero edifcios com necessidades quase nulas de energia. O objetivo do trabalho descrito neste artigo consiste na aplicao do conceito Net Zero Energy Building, ao edifcio existente do Instituto Superior Politcnico Gaya (ISPGaya), em Vila Nova de Gaia, com o intuito de analisar a viabilidade de otimizao de energia e a metodologia deste conceito ao edifcio, com recurso a ferramentas de simulao. Neste trabalho efetumos uma simulao energtica do edifcio, atravs do DesignBuilder, que servir como termo de comparao para outras simulaes. Sero delineadas as especificaes a implementar no edifcio por forma a ser considerado Net Zero Energy Building, com alteraes na simulao do mesmo de acordo com as novas especificaes. Por ltimo, ser feita a comparao tcnica, financeira e ambiental da soluo NZEB encontrada. Atravs das vrias simulaes energticas ao edifcio, conclui-se que possvel baixar as necessidades energticas do edifcio atravs de medidas de eficincia energtica, em especial na iluminao e que os resultados obtidos, apesar de ser vivel a implementao do conceito Net Zero Energy Building, traduzem um esforo financeiro e algumas condicionantes para a sua concretizao.
Resumo:
Background The improvement of energy efficiency in buildings is widely promoted as a measure to mitigate climate change through the reduction of CO2 emissions. Thermal regulations worldwide promote it, for both new and existing buildings. Among the existing stock, traditional and historic buildings pose the additional challenge of heritage conservation. Their energy efficiency upgrade raises the risk of provoking negative impacts on their significance. Aims and Methodology This research used an approach based on impact assessment methodologies, defining an inital baseline scenario for both heritage and energy, from which the appropriate improvement solutions were identified and assessed. The measures were dynamically simulated and the results for energy, CO2, cost and comfort compared with the initial scenario, and then being further assessed for their heritage impact to eventually determine the most feasible solutions. To test this method, ten case studies, representative of the identified typological variants, were selected among Oportos traditional buildings located in the World Heritage Site. Findings and Conclusions The fieldwork data revealed that the energy consumption of these dwellings was below the European average. Additionally, the households expressed that their home comfort sensation was overall positive. The simulations showed that the introduction of insulation and solar thermal panels were ineffective on these cases in terms of energy, cost and comfort. At the same time, these measures pose a great risk to the buildings heritage value. The most efficient solutions were obtained from behavioural changes and DHW retrofit. The study reinforced the idea that traditional buildings performed better than expected and can be retrofitted and updated at a low-cost and with passive solutions. The use of insulation and solar panels should be disregarded.
