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description Publicationkeyboard_double_arrow_right Conference object , Other literature type 2015 PortugalPublisher:Science and Education Research Council (COPEC) Authors: Santos, Luís M.; Couto, J. Pedro;handle: 1822/43275
Currently there is a growing concern about climate change resulting from increased CO2 emissions, leading to an increasing demand of buildings that are more sustainable and energy efficient. The AEC industry have been acquiring more demanding standards of sustainability and energy efficiency, requiring analysis processes to be more complex and integrated with each other. Therefore, it has become vital to implement BIM, enabling greater efficiency in the collaborative process between actors. Thus, the use of BIM can contribute to sustainability through forecasting energy consumption and their usage costs with credibility, reliability and consistency of results. The study of the benefits and barriers to the introduction of BIM in energy analysis of buildings and the analysis of the interoperability between BIM tools and specialized software for energy analysis becomes relevant, as well as the study of workflows that provide good efficiency, which will boost its correct implementation in the AEC industry Currently there is a growing concern about climate change resulting from increased CO2 emissions, leading to an increasing demand of buildings that are more sustainable and energy efficient. The AEC industry have been acquiring more demanding standards of sustainability and energy efficiency, requiring analysis processes to be more complex and integrated with each other. Therefore, it has become vital to implement BIM, enabling greater efficiency in the collaborative process between actors. Thus, the use of BIM can contribute to sustainability through forecasting energy consumption and their usage costs with credibility, reliability and consistency of results. The study of the benefits and barriers to the introduction of BIM in energy analysis of buildings and the analysis of the interoperability between BIM tools and specialized software for energy analysis becomes relevant, as well as the study of workflows that provide good efficiency, which will boost its correct implementation in the AEC industry
Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMConference object . 2015Data sources: Universidade do Minho: RepositoriUMUniversidade do Minho: RepositoriUMOther literature type . 2015Data sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 108visibility views 108 download downloads 37 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMConference object . 2015Data sources: Universidade do Minho: RepositoriUMUniversidade do Minho: RepositoriUMOther literature type . 2015Data sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2021 PortugalAuthors: Mendes, Marco Alexandre Carvalho;handle: 1822/78383
De acordo com o relatório da Organização Mundial para a Cooperação e Desenvolvimento Económico (OCDE), no ano de 2019, verificaram-se, novamente, aumentos nos consumos mundiais de energia primária e nas respetivas emissões de Gases com Efeito de Estufa (GEE). Torna-se, assim, por demais evidente que o estudo da eficiência energética desempenha um papel de enorme responsabilidade na racionalização destes valores. A dissertação que se apresenta aborda a execução de uma auditoria energética a um estabelecimento industrial têxtil concreto, inserido no subsetor de branqueamento e tingimento têxtil, abrangido pelo Sistema de Gestão dos Consumos Intensivos de Energia (SGCIE). Nas condições previstas pelo Decreto-Lei n.˚68-A/2015, torna-se obrigatória a execução de uma auditoria energética, visto que a instalação alvo apresentou, no ano civil de 2019, um consumo anual de energia primária de 3 454 toneladas equivalente de petróleo (tep). A caracterização energética da instalação e a identificação de potenciais programas de investimento em sistemas energéticos, conducentes ao aumento da eficiência energética e/ou redução da fatura energética da empresa, foram as principais finalidades deste estudo. De modo a efetuar-se a auditoria em questão, tornou-se essencial a realização de um enquadramento bibliográfico, abordando-se o consumo de energia nacional e mundial, bem como a respetiva legislação atualmente em vigor. De seguida, adotou-se a metodologia que seria a base do projeto, sendo esta etapa sucedida pela elaboração de um caderno subsetorial, referente à atividade empresarial em que a instalação alvo da auditoria se insere. Posteriormente, tiveram lugar etapas fundamentais ao processo de auditoria energética, nomeadamente a recolha de dados e planeamento da intervenção, os levantamentos e medições de campo e o tratamento e análise de toda a informação obtida. Por fim, com vista na implementação de um processo contínuo e eficiente de gestão da energia consumida na instalação e de forma a alcançarem-se os objetivos legalmente exigidos, foram ainda identificadas Medidas de Utilização Racional de Energia (MURE), destacando-se o dimensionamento de uma Unidade de Produção para Autoconsumo (UPAC) e a reativação do Sistema de Recuperação de Calor dos Efluentes Quentes da Tinturaria, constituintes do Plano de Racionalização dos Consumos Energéticos (PREn) da instalação auditada. According to the report of the Organization for Economic Co-operation and Development (OECD), in the year of 2019, there were, once again, increases in the world’s consumption of primary energy and in the respective emissions of Greenhouse Gases (GHG). It thus becomes all too clear that the study of energy efficiency plays an enormously responsible role in the rationalization of these values. The dissertation that is presented addresses the execution of an energy audit to a textile industrial establishment, inserted in the textile bleaching and dyeing subsector, covered by the Intensive Energy Consumption Management System (SGCIE). According to the Portuguese regulation conditions, provided by the Decree-Law nº 68-A/2015, it is mandatory to execute an energy audit, since the targeted industrial plant, in the calendar year of 2019, presented an annual primary energy consumption of 3 454 tonnes of oil equivalent (toe). The industrial plant’s energy characterization and the identification of potential investment programs in energy systems, that would lead to an increase in the overall energy efficiency and/or a reduction in the company’s energy expenses, were the main purposes of this study. In order to carry out the energy audit mentioned, the study of a bibliographic framework became essential, addressing the national and global energy consumption, as well as the respective legislation currently in force. Then, the methodology that would be the basis for this project was adopted and this step was followed by the elaboration of a subsector notebook, referring to the business activity in which the audited industrial plant is inserted. Subsequently, fundamental steps were taken so that audit the targeted industrial plant, namely the collection of data and intervention, the field surveys and measurements and the treatment and analysis of all the obtained information. Finally, with a view to implement a continuous and efficient management process of the industrial plant’s energy consumption, and in order to achieve the required legal objectives, Rational Energy Use Measures (MURE) were also identified, emphasizing the project of a Production Unit for Self-consumption (UPAC) and the Reactivation of the Dyeing’s Hot Effluents’ Heat Recovery System, as part of the audited industrial plant’s Energy Consumption Rationalization Plan (PREn). Dissertação de mestrado integrado em Engenharia Mecânica
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visibility 81visibility views 81 download downloads 41 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2021License: CC BY NC NDData sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2021 PortugalAuthors: Patrício, Bárbara Machado;handle: 1822/76875
A problemática ambiental é um dos assuntos mais discutidos em todos os seguimentos da economia por todo o mundo. A construção civil, frente ao seu processo produtivo, é responsável por consumir parte considerável dos recursos naturais, matérias primas e gerar milhares de toneladas de resíduos, chamados de resíduos de construção e demolição (RCD) todos os anos. Assim, este estudo teve como objetivos: desenvolver uma revisão bibliográfica frente ao tema proposto; analisar as principais dificuldades enfrentadas por construtoras atuantes em Portugal durante processo de gestão de seus RCD e; por fim apresentar um plano de ação visando melhorar a qualidade desse processo. Assim, foi realizado um estudo de caso com uma construtora, bem como aplicação de um inquérito a demais 15 construtoras, visando atingir aos objetivos propostos. Assim, por meio dos resultados obtidos no inquérito e no estudo de caso, constatou-se que apesar das legislações e políticas instituídas por órgãos governamentais, bem como a tendência por sistemas mais sustentáveis, as construtoras ainda encontram dificuldades e desafios no processo de gestão de seus resíduos, sendo os próprios problemas gerenciais das mesmas que impedem e atrapalham o processo. Espera-se que o plano de ação apresentado possa contribuir para que as empresas do setor da construção encontrem mais facilidade nesse processo, por meio do auxílio de metodologias comprovadamente eficazes. The environmental issue is one of the most discussed issues in all sectors of the economy around the world. Civil construction, in view of its production process, is responsible for consuming a considerable part of natural resources, raw materials and generating thousands of tons of waste, called construction and demolition waste (CDW) every year. Thus, this study aimed to: develop a literature review on the proposed theme; analyze the main difficulties faced by construction companies operating in Portugal during their RCD management process and; finally, present an action plan to improve the quality of this process. Thus, a case study was carried out with a construction company, as well as an application of a survey to other 15 construction companies, aiming to achieve the proposed objectives. Thus, through the results obtained in the survey and in the case study, it was found that despite the legislation and policies instituted by government agencies, as well as the trend towards more sustainable systems, construction companies still face difficulties and challenges in the process of managing their residues, and their own management problems impede and hinder the process. It is expected that the action plan presented can help companies in the construction sector to find it easier in this process, through the help of proven effective methodologies. Dissertação de mestrado em Gestão de Projetos de Engenharia
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 PortugalAuthors: Andrade, Renato Nurmberger Dias de;handle: 1822/86725
A pobreza energética aflige milhares de cidadãos em toda a Europa, incapazes de arcar com os custos energéticos para a manutenção do conforto térmico, em edifícios em bairros sociais, caracterizados pela ineficiência energética proveniente da baixa qualidade construtiva, ausência ou ineficiência de sistemas de climatização e de aquecimento das águas sanitárias, resultando em impactos sociais e económicos que reverberam em toda a sociedade. Nesse contexto, há imensos trabalhos de investigação, no sentido de se atingir a redução das necessidades energéticas de forma mais efetiva, bem como aumentar as condições de conforto dos habitantes, através de uma eficaz reabilitação energética das ineficientes envolventes dos edifícios de habitação social. Aumentar a qualidade construtiva, o conforto e mitigar a pobreza energética tão típica deste tipo de habitação, gera imensos benefícios aos cidadãos mais carentes e dependentes dos apoios sociais que consomem importantes recursos dos orçamentos dos governos. Há ainda uma reduzida aplicação de metodologias e de ferramentas de apoio ao projeto no processo de escolha das melhores soluções construtivas para a reabilitação de edifícios em bairros sociais, já que em muitos casos, as autarquias utilizam de forma pouco criteriosa soluções adotadas em experiências passadas para aplica-las em reabilitações futuras. Tendo definido a reabilitação energética das envolventes de edifícios em bairros sociais, como a mais efetiva ação no sentido de se reduzir a pobreza energética, mostrou-se necessário utilizar ferramentas e metodologias de apoio a projetos, como o EnergyPlus, DesignBulder e MARS aplicada no âmbito do projeto ARCAS e objeto de dissertação, capazes de ajudar na identificação das soluções mais adequadas e ainda permitir suas avaliações quanto ao cumprimento das exigências de sustentabilidade. Esse trabalho avaliou 03 cenários de reabilitação energética e identificou a melhor solução para reabilitação energética de edifícios localizados em bairros sociais, mediante aumento da eficiência energética e conforto das habitações, enquanto contribui para mitigar a pobreza energética nos bairros sociais, atendendo aos objetivos propostos nesse trabalho. Energy poverty affects thousands of citizens across Europe, unable to afford the energy costs for maintaining thermal comfort in buildings and dwellings in social neighbourhoods, characterized by energy inefficiency from poor constructive quality, absence or inefficiency of HVAC and DHW systems, resulting in social and economic impacts that reverberate throughout society. In this context, a lot of research was done to achieve the reduction of energy needs more effectively, as well as to increase the comfort conditions of the inhabitants, through an effective energy renovation of the poor envelops typical of social housing buildings. Increasing the constructive quality, comfort and mitigating the situation of energy poverty, so typical of this type of housing, generates large benefits to the most needy citizens and dependent on social support that consume important resources from the budgets of governments. Moreover, there is also a reduced application of methodologies and tools to support the project in the process of choosing the best constructive solutions for the renovation of buildings and housing in social neighbourhoods, since in many cases, municipalities use solutions adopted from past experiences without adapting them to the present situation. To support the renovation project, it is more effective to use some multicriteria analysis methodologies and tools, which are capable of helping to identify the most appropriate solutions and allow their assessment regarding compliance with sustainability requirements. With this dissertation, and under the ARCAS project, the MARS methodology, DesignBuilder and EnergyPlus, it was possible to identify the most effective action to mitigate energy poverty in some social housing neighbourhoods in Braga. This work evaluated 03 energy rehabilitation scenarios and identified the best solution for energy rehabilitation of buildings to be applied to social neighborhoods in Braga, resulting in increased energy efficiency and comfort of homes and at the same time contributing to mitigate energy poverty, meeting the objectives proposed in this work. Dissertação de mestrado em Construção e Reabilitação Sustentáveis
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 PortugalAuthors: Castro, Joel Afonso da Silva e;handle: 1822/83556
A recuperação de energia (calor) do ar de exaustão de um sistema de Aquecimento, Ventilação e Ar Condicionado (AVAC), é hoje fundamental numa procura contínua de eficiência energética dos sistemas térmicos, sendo aliás obrigatória, em muitas situações, no âmbito de diversas normas e legislação em vigor, nacionais e europeias. Este projeto foi concebido para estudar e caracterizar de forma detalhada a perda de carga no escoamento do ar nesta seccção da Unidade de Tratamento de Ar (UTA) (conjunto recuperador + bypass), quer no circuito de insuflação, quer no circuito de extração, procurando melhor entender e caracterizar os principais aspetos que a influenciam. Numa UTA, a utilização de registos de caudal de ar no recuperador de calor, promove um bypass a este componente, diminuindo o consumo de energia associado à ventilação. Esta dissertação foi realizada no âmbito de um estágio curricular na empresa EVAC – Equipamentos de Ventilação e Ar Condicionado, S.A., tendo sido facultado pela mesma, uma instalação composta, em resumo, por uma UTA, por um troço de uma conduta, quatro transdutores de pressão e um caudalímetro (flow nozzle), de modo a ser possível a realização de ensaios práticos. Esta projeto de investigação visa, numa primeira fase, recolher os valores obtidos nos ensaios, onde foram utilizadas e analisadas três chapas, que têm como objetivo simular o comportamento de uma roda térmica e de um registo de caudal na instalação, com diferentes geometrias para diferentes caudais. Todos os cálculos foram efetuados numa folha de cálculo do software Excel desenvolvido para o efeito. Por fim, encontram-se as análises e comparações destes vários ensaios, referentes às três chapas, bem como uma apreciação mais crítica dos resultados obtidos. The recovery of energy (heat) from a Heating, Ventilation, and Air Conditioning (HVAC) systems is now essential in the ongoing quest for thermal systems’ energy efficiency and is also frequently required by a range of national and european standards and legislation. In order to better understand and define the key factors that influence the pressure drop in the air flow in this section of the Air Handling Unit (AHU) (recover + bypass), this project was designed to study and characterize the pressure drop in detail. The utilization of airflow registers in a AHU induces a heat eecovery bypass reducing the energy consumption associated with ventilation. This dissertation was done as part of a curricular internship at EVAC - Equipa mentos de Ventilação e Ar Condicionado, S.A. To perform practical tests, EVAC provided an installation consisting of an Air Handling Unit (AHU), a duct section, four pressure transducers, and a flow nozzle. This research project intends, in a first phase, to gather the values obtained in the tests, where three plates were analyzed, which attempt to simulate the behaviour of a thermal wheel and a flow register in the installation, with different geometries for different flow rates. A spreadsheet made specifically for this purpose using the Excel program, was used for all calculations. Finally, we have analyses and correlations of these three distinct study cases, referring to the three plates, as well as a more critical assessment of the results. Dissertação de mestrado integrado em Engenharia Mecânica
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2022 PortugalAuthors: Copque, Augusto César da Silva Machado;handle: 1822/77421
A utilização da energia elétrica é de fundamental importância para o desenvolvimento das sociedades, porém o uso demasiado de energia através de combustíveis fósseis, tem provocado consequências socioambientais graves. As transformações que se refletem nas políticas públicas ambientais e na mudança de comportamento das pessoas, que ao longo do tempo têm acompanhado e cobrado aos seus governantes medidas mitigadoras para as questões que envolvem a relação de geração de energia e os impactes e conflitos socioambientais, inseriu, em especial, o território brasileiro no cenário de produção de energia de fontes renováveis, como a eólica, principalmente após a crise energética nos anos 2000 e a mais recente no anos de 2020/21. O setor energético eólico brasileiro, por sua vez, passa a ser visado por alguns dos seus efeitos negativos no ambiente e às comunidades tradicionais, causado tanto por alguns projetos mal estruturados, quanto pelo desperdício e pela ineficiência de sua produção. Desse modo, esta tese tem como principal objetivo identificar os conflitos socioambientais de projetos, parques e complexos de energia eólica onshore na Região Geográfica Imediata de Guanambi, no Estado da Bahia - Brasil, mais precisamente nos municípios de Guanambi, Caetité e Igaporã. Além disso, destaca-se também na pesquisa: 1) o papel das políticas públicas quanto ao incentivo à energia eólica; 2) a questão técnica, desde a fase de planeamento até a concepção de um empreendimento eólico; 3) as principais vantagens e desvantagens econômicas, ambientais e sociais desse recurso energético renovável; 4) os usos concorrentes do território entre as atividadesrealizadas pelas as comunidades tradicionais rurais, e as etapas de prospecção, implantação e operação de alguns parques e complexos de energia eólica, enfatizando os seus conflitos ambientais; e 5) as medidas mitigadoras para os conflitos e impactessocioambientais, provenientes das etapas supracitadas nos municípios em análise. Para esta investigação, foi utilizado o método indutivo, tendo em vista um estudo passível de generalizações. Além disso, identificou-se a necessidade da pesquisa qualitativa, atividades itinerantes com a aplicação de entrevistas e levantamento de matérias em jornais e mídias digitais. O entendimento sobre a questão ambiental e sua evolução histórica, caracterizando a avaliação de impactes ambientais. Na tese, apresentam-se os usos concorrentes do território e os seus confrontos entre as atividades rurais das comunidades tradicionais, desde o planeamento até o início da operação de empreendimentos eólicos, e identificam-se nestes empreendimentos a problemática dos conflitos socioambientais através de uma visão econômica, social e ambiental. A definição de conflitos teve sua relevância na pesquisa devido à forma como estes funcionam. Assim, foi possível notar que os conflitos que ocorrem não são consequências espontâneas dos processos de utilização e exploração dos seus recursos, mas produzidos a partir das diferentes formas de apropriação do território, que são mediadas pelas relações desiguais de poder. Por fim, a pesquisa demonstra as medidas mitigadoras e compensatórias dos impactes e conflitos socioambientais, objetivando o interesse em conciliar os usos do território para conservação com a geração de energia eólica e promover o desenvolvimento social e ambiental, através do acesso justo, equitativo, direto e/ou indireto, aos recursos ambientais disponíveis e de uso legal, por parte das comunidades locais. Use of electric energy is of basic importance for development of societies, however the excessive use of fossil fuel energy (oil, coal and gas) has caused serious social and environmental consequences. Transformations that are reflected in environmental public policies and in people's behavior change, which throughout the time has followed and demanded from their governments mitigating for issues involving the relationship of energy generation and socio-environmental impacts and conflicts, inserted, in particular, the Brazilian territory in the scenario of renewable energy production, such as wind power, especially after the energy crisis in the 2000s and the most recent in the years 2020-2021. In Brazilian wind energy sector, in turn, is being targeted for some of its negative effects on the environment and traditional communities, caused both by some poorly structured and poorly executed projects, as well as by the waste and inefficiency of its production. Thus, this thesis has as main objective to identify socio-environmental conflicts of onshore wind energy projects, parks and complexes in the Geographic Region of Guanambi, in the State of Bahia-Brazil, more precisely in the municipalities of Guanambi, Caetité and Igaporã. In addition, the research also highlights: 1) role of public policies regarding the encouragement of wind energy; 2) technical issue, from the planning stage to the design of a wind enterprise; 3) some main economic, environmental and social advantages and disadvantages of this renewable energy resource; 4) competing uses of territory between the activities carried out by the communities, usually rural, and the prospecting, implanting and operating stages of some wind energy parks and complexes, emphasizing their environmental conflicts; and 5) mitigating for socio environmental conflicts and impacts, arising from the above-mentioned stages in the municipalities analysis. For this investigation, inductive method was used, in view to a generalizable study. In addition, it identified the need for qualitative research (bibliographic and documentary), itinerant activities with application of interviews and search in newspapers and digital media. Understanding of the environmental issue and its historical evolution, characterizing the assessment of environmental impacts, it became necessary to understand the topic addressed. In this thesis, the competing uses of territory and their clashes between rural activities of traditional communities are presented, from planning to beginning of the operation of wind projects, and the problem of socio-environmental conflicts is identified through an economic, social and environmental vision. Definition of socio-environmental conflicts has had its relevance in the research due to the way they work. Thus, it was possible to notice that socio-environmental conflicts that occur are not spontaneous consequences of the processes of use and exploitation of its resources, but produced from the different forms of appropriation of the territory, which are mediated by unequal power relations. Finally, the research demonstrates mitigating and compensatory practice for socio-environmental impacts and conflicts, aiming at the interest in reconciling uses of territories for conservation with the generation of wind energy and promoting social and environmental development, through fair, equitable, direct and/or indirect access, to available environmental resources and legal use by local communities. Tese de doutoramento em Geografia (especialidade de Geografia Física e Estudos Ambientais)
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2022 PortugalAuthors: Martins, Hugo Miguel Gomes;handle: 1822/81485
A construção sustentável representa hoje em dia, uma elevada preocupação nas sociedades. Esta preocupação traduz-se na procura de um desenvolvimento económico capaz de permitir um equilíbrio social e um mínimo impacte ambiental. Contudo, o desenvolvimento de todas as atividades económicas está associado ao consumo de energia, na sua maioria de origem fóssil, impactantes no meio ambiente por meio da libertação de gases com efeito de estufa. O setor da construção em Portugal é um grande consumidor, tanto na fase de construção, como na fase de uso dos edifícios, apresentando um vasto parque habitacional, pouco eficiente energeticamente, e com elevado potencial de reabilitação ao nível térmico. A presente dissertação foi desenvolvida no contexto da alteração, verificada em 2021, à legislação nacional sobre a certificação energética de edifícios de habitação (REH). Após a introdução ao tema, da estrutura da dissertação, e das atividades desenvolvidas, procede-se à descrição dos documentos regulamentares (Decretos-Lei, Despachos e Portarias) e, respetivas atualizações referentes ao comportamento térmico dos edifícios em Portugal. Tendo a ADENE, a responsabilidade pela gestão deste sistema nacional de certificação. À luz do novo Regulamento e Sistema de Certificação Energética, pretende-se perceber qual a influência do mesmo nos consumos energéticos estimados, no conjunto das edificações construídas ou reabilitadas a partir de 2021, e avaliar o grau de exigência da nova legislação de regulamentação das caraterísticas de comportamento térmico dos edifícios, Decreto-Lei n.º 101-D/2020 de 7 de dezembro, face ao antigo regulamento, Decreto-Lei n.º 118/2013, de 20 de agosto. Para o efeito, foi utilizado um edifício de habitação, como caso de estudo, de aplicação dos modelos de simulação, de acordo com as regras e requisitos em ambas as regulamentações. Foram identificadas as principais diferenças, as exigências e os impactos nas soluções construtivas do edifício, decorrentes da aplicação das mesmas. Como era espectável, um edifício concebido à luz da anterior legislação com uma classificação energética inferior a A, como é o caso do edifício do caso de estudo, terá que ser objeto de uma intervenção de reabilitação energética para conseguir cumprir com os requisitos da atual legislação. Sustainable construction is nowadays a major concern in societies. This concern is reflected in the search for economic development allowing social balance and minimal environment impact. However, the development of all economic activities is associated with the consumption of energy, mostly of fossil origin, which impacts the environment through the release of greenhouse gases. The Construction sector in Portugal is a major consumer of these energies, both in the construction phase, and in the use phase of buildings, presenting a vast housing stock, not very energy efficient, and with high potential for thermal rehabilitation. This dissertation was developed in the context of the change made in 2021 to the national legislation on the energy certification of residential buildings (REH). After introducing the dissertation’s structure topic and the activities carried out, the procedure is to describe the regulatory documents (Decrees-Law, Dispatches and Ordinances) and their respective updates regarding the thermal behaviour of buildings in Portugal. ADENE is responsible for managing this national certification system. The goal is to understand the influence of the new Regulation and Energy Certification System, Decree Law n.º 101-D/2020, December 7th , in the estimated energy consumption of new or rehabilitated sets of buildings from the year of 2021, and to assess the demanding level of the regulatory legislation of the building’s thermic behaviour characteristics, comparing to Decree-Law n.º 118 / 2013, August 20th . For this purpose, a residential building was analysed, as a case study, in the context of the new regulations regarding its energy performance, referring to its heating and cooling needs. Two analyses were made, the first consisted of evaluating the thermal behaviour of the building by REH 2018, and the second aimed to evaluate the same behaviour, but by HAB 2020 standards. As expected, a building designed according to the previous legislation with an energy rating lower than A will have to be subjected to an energy rehabilitation intervention to be able to comply with the requirements of the current legislation, which is the case of the building used in the study. Dissertação de mestrado integrado em Engenharia Civil
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2021 PortugalAuthors: Fernandes, Ana Maria Magalhães;handle: 1822/76585
Atualmente vivemos numa era em que a preocupação com a ecologia e a sustentabilidade é de extrema importância. Nas diferentes áreas do saber, é urgente tornar esta preocupação um foco e adaptar a vida das sociedades a uma realidade mais sustentável a todos os níveis: ambiental, social e económico. O recurso ao veículo de transporte individual como forma de transporte principal veio, aliado ao crescimento demográfico, trazer cenários caóticos às cidades. Por isso, é necessário repensar a mobilidade dentro das mesmas para consequentemente melhorar a qualidade de vida dos cidadãos. Especificamente aplicado à cidade de Braga, o projeto consistirá em, depois de uma análise acerca da mobilidade dentro da cidade e da evolução estrutural e demográfica ao longo dos anos, fazer uma proposta para melhorar e reestruturar o sistema de mobilidade de modo a alinhar o perfil da cidade com as exigências requeridas, em prol de um futuro mais sustentável. We currently live in an era in which the concern around ecology and sustainability is of utmost importance. In all the different areas of knowledge, it is urgent to make this concern a priority and to adapt our societies lives to a more sustainable reality at all levels: ecology, social and economic. The use of the individual transportation methods as the main form of transportation, along with the demographic growth, has brought chaotic scenarios to cities. Therefore, it is necessary to rethink mobility within them to consequently improve the quality of life to all citizens. Specifically focusing to the city of Braga, the project will consist in, after an analysis about the mobility within the city and the structural and demographic evolution the city had over the years, making a proposal to improve and restructure the mobility system in order to align the city’s profile with the requirements towards a more sustainable future. Projeto de mestrado integrado em Arquitetura
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visibility 203visibility views 203 download downloads 91 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2021License: CC BYData sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2022 PortugalAuthors: Menten, Guilherme Scatolini;handle: 1822/86449
Entre os impactos esperados das alterações climáticas estão a intensificação do aumento do nível médio do mar e a alteração dos padrões pluviométricos regionais. Os estuários estão entre as zonas mais vulneráveis a esses efeitos, sendo assim necessário entender os impactos nos mesmos para melhor planear ações de mitigação e aumento da resiliência. Neste trabalho foi aplicada modelação numérica, através do software Delft3D, para simular os efeitos na intrusão salina do estuário do Rio Minho sob os cenários RCP4.5 e RCP8.5, adotados pelo IPCC. Os caudais fluviais são regulados por diversas barragens, sendo influenciados apenas de forma indireta pelas alterações nos padrões pluviométricos. Assim, foi estudada a variação dos caudais de modo a apoiar futuras ações de planeamento e eventuais revisões das regras de operação dessas barragens para limitar a intrusão salina. Verificou-se o aumento da intrusão salina a montante do estuário com o aumento do nível do mar e a diminuição dos caudais fluviais chegando, no pior caso, à extensão de 28,9 km a partir da foz do estuário, o que poderá implicar com os usos da água nesta região. A extensão da intrusão salina apresenta maior dependência em relação às variações de caudal em situações de seca. Assim, nos casos mais críticos, ou seja, com maior intrusão salina, o caudal fluvial demonstrou ser o fator de maior importância, sendo a sua regularização uma ferramenta de controlo da extensão da intrusão salina no estuário. Among the expected impacts of climate change are the increased mean sea level rise and the changes in regional rainfall patterns. Estuaries are among the most vulnerable areas to these effects, so it is necessary to understand their impacts to better plan mitigation actions and increase resilience. Numerical modeling was applied in this work, using the Delft3D software, to simulate the effects of saline intrusion in the Minho River estuary under RCP4.5 and RCP8.5 scenarios adopted by the IPCC. In this case, the river`s flow is regulated by several dams, and the flow that reaches the estuary is only indirectly influenced by changes in rainfall patterns. Thus, the variation of river flows was studied in order to support future planning actions and revision of the dam discharges rules that should be followed to control salt intrusion. An increase in salt intrusion was observed at the upstream estuary with an increase in the sea level and the decrease in river flows reaching, in the worst case, the extension of 28.9 km from the estuarine mouth, which can bring several impacts to the different water uses in the region. The extent of salt intrusion showed a greater dependence on river flows variations under drought conditions. Thus, in the most critical cases, that is, with greater salt intrusion, the river flow proved to be the most important factor, and its control is an efficient tool to limit the extent of salt intrusion in the estuary. Agradeço também ao projeto EsCo-Ensembles (PTDC/ECI-EGC/30877/2017), cofinanciado por NORTE2020, Portugal 2020 e a União Europeia através do ERDF, e FCT através de fundos nacionais, cujos financiamentos apoiaram a criação do modelo utilizado, assim como de parte dos dados. Dissertação de mestrado em Engenharia Urbana
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2018 PortugalPublisher:Universidade Nova de Lisboa. Centro Interdisciplinar de Ciências Sociais (CICS.NOVA) Authors: Balbé, Alice;handle: 1822/70440
Diariamente, milhões de pessoas acedem às redes sociais para visualizarem e publicarem conteúdos, sejam eles textos, imagens ou vídeos, o que envolve também o consumo e disseminação de notícias e opiniões. Estes novos espaços comunicacionais já fazem parte do cotidiano de grande parte das sociedades contemporâneas, principalmente dos jovens, e como um suporte de informação variada são relevantes para a investigação em diversas áreas, como a comunicação sobre as alterações climáticas que é o foco deste artigo. As características mensagens curtas e a instantaneidade provocada pela pergunta de abertura “o que está acontecendo?”, fizeram com que a rede social Twitter chegasse a ser apontada como canal de organização de mobilizações como Occuppy Wall Street e a Primavera Árabe. O uso de termos supervalorizados como a “revolução do Twitter” atraíram a atenção da academia para estudos sobre interação e participação online. O Twitter já foi classificado como um termômetro da percepção pública (Brown & Wake, 2015) e no caso da comunicação sobre as alterações climáticas, foi caracterizado como uma rede distribuída de sensores (Kirilenko et al., 2015). Devido a possibilidade de pesquisa e da agregação de publicações por termos-chave (e hashtags) cria-se um ambiente segmentado por tema, permitindo identificar os conteúdos mais valorizados dentro da rede social. Desta forma, este trabalho analisa os termos-chave mais utilizados para se referir às alterações climáticas em português e espanhol, no período de seis meses, incluindo o período de realização da 21ª Conferência das Partes (COP21) da Convenção-Quadro das Nações Unidas sobre as Alterações Climáticas. Buscou-se compreender quais os conteúdos mais relevantes nesta rede social, o impacto da realização da COP21 e a influência da mídia, como também tentar perceber os usos da rede social no contexto da comunicação sobre as alterações climáticas. Entre os resultados, a mídia é referência importante dentro da rede social e conteúdos sobre consequências negativas tiveram destaque. Houve variação nas temáticas dos conteúdos comparativamente entre os dois períodos da análise. Daily, millions of people access social networks to view and to publish content in text, photo or video format, which also includes consuming and disseminating news and opinions. In fact, these new communication spaces are already part of everyday life in most contemporary societies, especially among young people. As a support for diverse information, they consist in a relevant research subject in several areas, for instance, communication on climate change, which is the focus of this research work.The short messages and instantaneousness characteristics combined with the opening question “what is happening?”, have led the social network Twitter to be designated as a channel of mobilization organization such as Occupy Wall Street and the Arab Spring. Related to overvalued terms like “Twitter revolution's” it has attracted the academy attention towards investigating the online interaction and participation. The Twitter has already been classified as thermometer of public perceptions (Brown & Wake, 2015) and in the case of climate change communication, Twitter users were considered a distributed network of sensors (Kirilenko et al., 2015). Due to the possibility of searching and aggregating publications by keywords (and hashtags), a segmented environment is created by subjects, allowing to identify the most valuable contents within the social network. In this way, this paper analyses keywords used to refer climate change in Portuguese and Spanish over a period of six months, including the 21st Conference of the Parties (COP21) of the United Nations Framework Convention on Climate Change. It aims to understand the most relevant contents in this social network, the impact of COP21 and the media influence. In addition, it addresses the uses of such social network in the context of communication on climate change. among the results, the analysis found the media is an important reference within the social network and contents about negative consequences have been highlighted. There was variation in content themes comparatively between the two periods of analysis.
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description Publicationkeyboard_double_arrow_right Conference object , Other literature type 2015 PortugalPublisher:Science and Education Research Council (COPEC) Authors: Santos, Luís M.; Couto, J. Pedro;handle: 1822/43275
Currently there is a growing concern about climate change resulting from increased CO2 emissions, leading to an increasing demand of buildings that are more sustainable and energy efficient. The AEC industry have been acquiring more demanding standards of sustainability and energy efficiency, requiring analysis processes to be more complex and integrated with each other. Therefore, it has become vital to implement BIM, enabling greater efficiency in the collaborative process between actors. Thus, the use of BIM can contribute to sustainability through forecasting energy consumption and their usage costs with credibility, reliability and consistency of results. The study of the benefits and barriers to the introduction of BIM in energy analysis of buildings and the analysis of the interoperability between BIM tools and specialized software for energy analysis becomes relevant, as well as the study of workflows that provide good efficiency, which will boost its correct implementation in the AEC industry Currently there is a growing concern about climate change resulting from increased CO2 emissions, leading to an increasing demand of buildings that are more sustainable and energy efficient. The AEC industry have been acquiring more demanding standards of sustainability and energy efficiency, requiring analysis processes to be more complex and integrated with each other. Therefore, it has become vital to implement BIM, enabling greater efficiency in the collaborative process between actors. Thus, the use of BIM can contribute to sustainability through forecasting energy consumption and their usage costs with credibility, reliability and consistency of results. The study of the benefits and barriers to the introduction of BIM in energy analysis of buildings and the analysis of the interoperability between BIM tools and specialized software for energy analysis becomes relevant, as well as the study of workflows that provide good efficiency, which will boost its correct implementation in the AEC industry
Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMConference object . 2015Data sources: Universidade do Minho: RepositoriUMUniversidade do Minho: RepositoriUMOther literature type . 2015Data sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 108visibility views 108 download downloads 37 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMConference object . 2015Data sources: Universidade do Minho: RepositoriUMUniversidade do Minho: RepositoriUMOther literature type . 2015Data sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2021 PortugalAuthors: Mendes, Marco Alexandre Carvalho;handle: 1822/78383
De acordo com o relatório da Organização Mundial para a Cooperação e Desenvolvimento Económico (OCDE), no ano de 2019, verificaram-se, novamente, aumentos nos consumos mundiais de energia primária e nas respetivas emissões de Gases com Efeito de Estufa (GEE). Torna-se, assim, por demais evidente que o estudo da eficiência energética desempenha um papel de enorme responsabilidade na racionalização destes valores. A dissertação que se apresenta aborda a execução de uma auditoria energética a um estabelecimento industrial têxtil concreto, inserido no subsetor de branqueamento e tingimento têxtil, abrangido pelo Sistema de Gestão dos Consumos Intensivos de Energia (SGCIE). Nas condições previstas pelo Decreto-Lei n.˚68-A/2015, torna-se obrigatória a execução de uma auditoria energética, visto que a instalação alvo apresentou, no ano civil de 2019, um consumo anual de energia primária de 3 454 toneladas equivalente de petróleo (tep). A caracterização energética da instalação e a identificação de potenciais programas de investimento em sistemas energéticos, conducentes ao aumento da eficiência energética e/ou redução da fatura energética da empresa, foram as principais finalidades deste estudo. De modo a efetuar-se a auditoria em questão, tornou-se essencial a realização de um enquadramento bibliográfico, abordando-se o consumo de energia nacional e mundial, bem como a respetiva legislação atualmente em vigor. De seguida, adotou-se a metodologia que seria a base do projeto, sendo esta etapa sucedida pela elaboração de um caderno subsetorial, referente à atividade empresarial em que a instalação alvo da auditoria se insere. Posteriormente, tiveram lugar etapas fundamentais ao processo de auditoria energética, nomeadamente a recolha de dados e planeamento da intervenção, os levantamentos e medições de campo e o tratamento e análise de toda a informação obtida. Por fim, com vista na implementação de um processo contínuo e eficiente de gestão da energia consumida na instalação e de forma a alcançarem-se os objetivos legalmente exigidos, foram ainda identificadas Medidas de Utilização Racional de Energia (MURE), destacando-se o dimensionamento de uma Unidade de Produção para Autoconsumo (UPAC) e a reativação do Sistema de Recuperação de Calor dos Efluentes Quentes da Tinturaria, constituintes do Plano de Racionalização dos Consumos Energéticos (PREn) da instalação auditada. According to the report of the Organization for Economic Co-operation and Development (OECD), in the year of 2019, there were, once again, increases in the world’s consumption of primary energy and in the respective emissions of Greenhouse Gases (GHG). It thus becomes all too clear that the study of energy efficiency plays an enormously responsible role in the rationalization of these values. The dissertation that is presented addresses the execution of an energy audit to a textile industrial establishment, inserted in the textile bleaching and dyeing subsector, covered by the Intensive Energy Consumption Management System (SGCIE). According to the Portuguese regulation conditions, provided by the Decree-Law nº 68-A/2015, it is mandatory to execute an energy audit, since the targeted industrial plant, in the calendar year of 2019, presented an annual primary energy consumption of 3 454 tonnes of oil equivalent (toe). The industrial plant’s energy characterization and the identification of potential investment programs in energy systems, that would lead to an increase in the overall energy efficiency and/or a reduction in the company’s energy expenses, were the main purposes of this study. In order to carry out the energy audit mentioned, the study of a bibliographic framework became essential, addressing the national and global energy consumption, as well as the respective legislation currently in force. Then, the methodology that would be the basis for this project was adopted and this step was followed by the elaboration of a subsector notebook, referring to the business activity in which the audited industrial plant is inserted. Subsequently, fundamental steps were taken so that audit the targeted industrial plant, namely the collection of data and intervention, the field surveys and measurements and the treatment and analysis of all the obtained information. Finally, with a view to implement a continuous and efficient management process of the industrial plant’s energy consumption, and in order to achieve the required legal objectives, Rational Energy Use Measures (MURE) were also identified, emphasizing the project of a Production Unit for Self-consumption (UPAC) and the Reactivation of the Dyeing’s Hot Effluents’ Heat Recovery System, as part of the audited industrial plant’s Energy Consumption Rationalization Plan (PREn). Dissertação de mestrado integrado em Engenharia Mecânica
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visibility 81visibility views 81 download downloads 41 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2021License: CC BY NC NDData sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2021 PortugalAuthors: Patrício, Bárbara Machado;handle: 1822/76875
A problemática ambiental é um dos assuntos mais discutidos em todos os seguimentos da economia por todo o mundo. A construção civil, frente ao seu processo produtivo, é responsável por consumir parte considerável dos recursos naturais, matérias primas e gerar milhares de toneladas de resíduos, chamados de resíduos de construção e demolição (RCD) todos os anos. Assim, este estudo teve como objetivos: desenvolver uma revisão bibliográfica frente ao tema proposto; analisar as principais dificuldades enfrentadas por construtoras atuantes em Portugal durante processo de gestão de seus RCD e; por fim apresentar um plano de ação visando melhorar a qualidade desse processo. Assim, foi realizado um estudo de caso com uma construtora, bem como aplicação de um inquérito a demais 15 construtoras, visando atingir aos objetivos propostos. Assim, por meio dos resultados obtidos no inquérito e no estudo de caso, constatou-se que apesar das legislações e políticas instituídas por órgãos governamentais, bem como a tendência por sistemas mais sustentáveis, as construtoras ainda encontram dificuldades e desafios no processo de gestão de seus resíduos, sendo os próprios problemas gerenciais das mesmas que impedem e atrapalham o processo. Espera-se que o plano de ação apresentado possa contribuir para que as empresas do setor da construção encontrem mais facilidade nesse processo, por meio do auxílio de metodologias comprovadamente eficazes. The environmental issue is one of the most discussed issues in all sectors of the economy around the world. Civil construction, in view of its production process, is responsible for consuming a considerable part of natural resources, raw materials and generating thousands of tons of waste, called construction and demolition waste (CDW) every year. Thus, this study aimed to: develop a literature review on the proposed theme; analyze the main difficulties faced by construction companies operating in Portugal during their RCD management process and; finally, present an action plan to improve the quality of this process. Thus, a case study was carried out with a construction company, as well as an application of a survey to other 15 construction companies, aiming to achieve the proposed objectives. Thus, through the results obtained in the survey and in the case study, it was found that despite the legislation and policies instituted by government agencies, as well as the trend towards more sustainable systems, construction companies still face difficulties and challenges in the process of managing their residues, and their own management problems impede and hinder the process. It is expected that the action plan presented can help companies in the construction sector to find it easier in this process, through the help of proven effective methodologies. Dissertação de mestrado em Gestão de Projetos de Engenharia
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visibility 57visibility views 57 download downloads 28 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2021License: CC BYData sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 PortugalAuthors: Andrade, Renato Nurmberger Dias de;handle: 1822/86725
A pobreza energética aflige milhares de cidadãos em toda a Europa, incapazes de arcar com os custos energéticos para a manutenção do conforto térmico, em edifícios em bairros sociais, caracterizados pela ineficiência energética proveniente da baixa qualidade construtiva, ausência ou ineficiência de sistemas de climatização e de aquecimento das águas sanitárias, resultando em impactos sociais e económicos que reverberam em toda a sociedade. Nesse contexto, há imensos trabalhos de investigação, no sentido de se atingir a redução das necessidades energéticas de forma mais efetiva, bem como aumentar as condições de conforto dos habitantes, através de uma eficaz reabilitação energética das ineficientes envolventes dos edifícios de habitação social. Aumentar a qualidade construtiva, o conforto e mitigar a pobreza energética tão típica deste tipo de habitação, gera imensos benefícios aos cidadãos mais carentes e dependentes dos apoios sociais que consomem importantes recursos dos orçamentos dos governos. Há ainda uma reduzida aplicação de metodologias e de ferramentas de apoio ao projeto no processo de escolha das melhores soluções construtivas para a reabilitação de edifícios em bairros sociais, já que em muitos casos, as autarquias utilizam de forma pouco criteriosa soluções adotadas em experiências passadas para aplica-las em reabilitações futuras. Tendo definido a reabilitação energética das envolventes de edifícios em bairros sociais, como a mais efetiva ação no sentido de se reduzir a pobreza energética, mostrou-se necessário utilizar ferramentas e metodologias de apoio a projetos, como o EnergyPlus, DesignBulder e MARS aplicada no âmbito do projeto ARCAS e objeto de dissertação, capazes de ajudar na identificação das soluções mais adequadas e ainda permitir suas avaliações quanto ao cumprimento das exigências de sustentabilidade. Esse trabalho avaliou 03 cenários de reabilitação energética e identificou a melhor solução para reabilitação energética de edifícios localizados em bairros sociais, mediante aumento da eficiência energética e conforto das habitações, enquanto contribui para mitigar a pobreza energética nos bairros sociais, atendendo aos objetivos propostos nesse trabalho. Energy poverty affects thousands of citizens across Europe, unable to afford the energy costs for maintaining thermal comfort in buildings and dwellings in social neighbourhoods, characterized by energy inefficiency from poor constructive quality, absence or inefficiency of HVAC and DHW systems, resulting in social and economic impacts that reverberate throughout society. In this context, a lot of research was done to achieve the reduction of energy needs more effectively, as well as to increase the comfort conditions of the inhabitants, through an effective energy renovation of the poor envelops typical of social housing buildings. Increasing the constructive quality, comfort and mitigating the situation of energy poverty, so typical of this type of housing, generates large benefits to the most needy citizens and dependent on social support that consume important resources from the budgets of governments. Moreover, there is also a reduced application of methodologies and tools to support the project in the process of choosing the best constructive solutions for the renovation of buildings and housing in social neighbourhoods, since in many cases, municipalities use solutions adopted from past experiences without adapting them to the present situation. To support the renovation project, it is more effective to use some multicriteria analysis methodologies and tools, which are capable of helping to identify the most appropriate solutions and allow their assessment regarding compliance with sustainability requirements. With this dissertation, and under the ARCAS project, the MARS methodology, DesignBuilder and EnergyPlus, it was possible to identify the most effective action to mitigate energy poverty in some social housing neighbourhoods in Braga. This work evaluated 03 energy rehabilitation scenarios and identified the best solution for energy rehabilitation of buildings to be applied to social neighborhoods in Braga, resulting in increased energy efficiency and comfort of homes and at the same time contributing to mitigate energy poverty, meeting the objectives proposed in this work. Dissertação de mestrado em Construção e Reabilitação Sustentáveis
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 PortugalAuthors: Castro, Joel Afonso da Silva e;handle: 1822/83556
A recuperação de energia (calor) do ar de exaustão de um sistema de Aquecimento, Ventilação e Ar Condicionado (AVAC), é hoje fundamental numa procura contínua de eficiência energética dos sistemas térmicos, sendo aliás obrigatória, em muitas situações, no âmbito de diversas normas e legislação em vigor, nacionais e europeias. Este projeto foi concebido para estudar e caracterizar de forma detalhada a perda de carga no escoamento do ar nesta seccção da Unidade de Tratamento de Ar (UTA) (conjunto recuperador + bypass), quer no circuito de insuflação, quer no circuito de extração, procurando melhor entender e caracterizar os principais aspetos que a influenciam. Numa UTA, a utilização de registos de caudal de ar no recuperador de calor, promove um bypass a este componente, diminuindo o consumo de energia associado à ventilação. Esta dissertação foi realizada no âmbito de um estágio curricular na empresa EVAC – Equipamentos de Ventilação e Ar Condicionado, S.A., tendo sido facultado pela mesma, uma instalação composta, em resumo, por uma UTA, por um troço de uma conduta, quatro transdutores de pressão e um caudalímetro (flow nozzle), de modo a ser possível a realização de ensaios práticos. Esta projeto de investigação visa, numa primeira fase, recolher os valores obtidos nos ensaios, onde foram utilizadas e analisadas três chapas, que têm como objetivo simular o comportamento de uma roda térmica e de um registo de caudal na instalação, com diferentes geometrias para diferentes caudais. Todos os cálculos foram efetuados numa folha de cálculo do software Excel desenvolvido para o efeito. Por fim, encontram-se as análises e comparações destes vários ensaios, referentes às três chapas, bem como uma apreciação mais crítica dos resultados obtidos. The recovery of energy (heat) from a Heating, Ventilation, and Air Conditioning (HVAC) systems is now essential in the ongoing quest for thermal systems’ energy efficiency and is also frequently required by a range of national and european standards and legislation. In order to better understand and define the key factors that influence the pressure drop in the air flow in this section of the Air Handling Unit (AHU) (recover + bypass), this project was designed to study and characterize the pressure drop in detail. The utilization of airflow registers in a AHU induces a heat eecovery bypass reducing the energy consumption associated with ventilation. This dissertation was done as part of a curricular internship at EVAC - Equipa mentos de Ventilação e Ar Condicionado, S.A. To perform practical tests, EVAC provided an installation consisting of an Air Handling Unit (AHU), a duct section, four pressure transducers, and a flow nozzle. This research project intends, in a first phase, to gather the values obtained in the tests, where three plates were analyzed, which attempt to simulate the behaviour of a thermal wheel and a flow register in the installation, with different geometries for different flow rates. A spreadsheet made specifically for this purpose using the Excel program, was used for all calculations. Finally, we have analyses and correlations of these three distinct study cases, referring to the three plates, as well as a more critical assessment of the results. Dissertação de mestrado integrado em Engenharia Mecânica
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2022 PortugalAuthors: Copque, Augusto César da Silva Machado;handle: 1822/77421
A utilização da energia elétrica é de fundamental importância para o desenvolvimento das sociedades, porém o uso demasiado de energia através de combustíveis fósseis, tem provocado consequências socioambientais graves. As transformações que se refletem nas políticas públicas ambientais e na mudança de comportamento das pessoas, que ao longo do tempo têm acompanhado e cobrado aos seus governantes medidas mitigadoras para as questões que envolvem a relação de geração de energia e os impactes e conflitos socioambientais, inseriu, em especial, o território brasileiro no cenário de produção de energia de fontes renováveis, como a eólica, principalmente após a crise energética nos anos 2000 e a mais recente no anos de 2020/21. O setor energético eólico brasileiro, por sua vez, passa a ser visado por alguns dos seus efeitos negativos no ambiente e às comunidades tradicionais, causado tanto por alguns projetos mal estruturados, quanto pelo desperdício e pela ineficiência de sua produção. Desse modo, esta tese tem como principal objetivo identificar os conflitos socioambientais de projetos, parques e complexos de energia eólica onshore na Região Geográfica Imediata de Guanambi, no Estado da Bahia - Brasil, mais precisamente nos municípios de Guanambi, Caetité e Igaporã. Além disso, destaca-se também na pesquisa: 1) o papel das políticas públicas quanto ao incentivo à energia eólica; 2) a questão técnica, desde a fase de planeamento até a concepção de um empreendimento eólico; 3) as principais vantagens e desvantagens econômicas, ambientais e sociais desse recurso energético renovável; 4) os usos concorrentes do território entre as atividadesrealizadas pelas as comunidades tradicionais rurais, e as etapas de prospecção, implantação e operação de alguns parques e complexos de energia eólica, enfatizando os seus conflitos ambientais; e 5) as medidas mitigadoras para os conflitos e impactessocioambientais, provenientes das etapas supracitadas nos municípios em análise. Para esta investigação, foi utilizado o método indutivo, tendo em vista um estudo passível de generalizações. Além disso, identificou-se a necessidade da pesquisa qualitativa, atividades itinerantes com a aplicação de entrevistas e levantamento de matérias em jornais e mídias digitais. O entendimento sobre a questão ambiental e sua evolução histórica, caracterizando a avaliação de impactes ambientais. Na tese, apresentam-se os usos concorrentes do território e os seus confrontos entre as atividades rurais das comunidades tradicionais, desde o planeamento até o início da operação de empreendimentos eólicos, e identificam-se nestes empreendimentos a problemática dos conflitos socioambientais através de uma visão econômica, social e ambiental. A definição de conflitos teve sua relevância na pesquisa devido à forma como estes funcionam. Assim, foi possível notar que os conflitos que ocorrem não são consequências espontâneas dos processos de utilização e exploração dos seus recursos, mas produzidos a partir das diferentes formas de apropriação do território, que são mediadas pelas relações desiguais de poder. Por fim, a pesquisa demonstra as medidas mitigadoras e compensatórias dos impactes e conflitos socioambientais, objetivando o interesse em conciliar os usos do território para conservação com a geração de energia eólica e promover o desenvolvimento social e ambiental, através do acesso justo, equitativo, direto e/ou indireto, aos recursos ambientais disponíveis e de uso legal, por parte das comunidades locais. Use of electric energy is of basic importance for development of societies, however the excessive use of fossil fuel energy (oil, coal and gas) has caused serious social and environmental consequences. Transformations that are reflected in environmental public policies and in people's behavior change, which throughout the time has followed and demanded from their governments mitigating for issues involving the relationship of energy generation and socio-environmental impacts and conflicts, inserted, in particular, the Brazilian territory in the scenario of renewable energy production, such as wind power, especially after the energy crisis in the 2000s and the most recent in the years 2020-2021. In Brazilian wind energy sector, in turn, is being targeted for some of its negative effects on the environment and traditional communities, caused both by some poorly structured and poorly executed projects, as well as by the waste and inefficiency of its production. Thus, this thesis has as main objective to identify socio-environmental conflicts of onshore wind energy projects, parks and complexes in the Geographic Region of Guanambi, in the State of Bahia-Brazil, more precisely in the municipalities of Guanambi, Caetité and Igaporã. In addition, the research also highlights: 1) role of public policies regarding the encouragement of wind energy; 2) technical issue, from the planning stage to the design of a wind enterprise; 3) some main economic, environmental and social advantages and disadvantages of this renewable energy resource; 4) competing uses of territory between the activities carried out by the communities, usually rural, and the prospecting, implanting and operating stages of some wind energy parks and complexes, emphasizing their environmental conflicts; and 5) mitigating for socio environmental conflicts and impacts, arising from the above-mentioned stages in the municipalities analysis. For this investigation, inductive method was used, in view to a generalizable study. In addition, it identified the need for qualitative research (bibliographic and documentary), itinerant activities with application of interviews and search in newspapers and digital media. Understanding of the environmental issue and its historical evolution, characterizing the assessment of environmental impacts, it became necessary to understand the topic addressed. In this thesis, the competing uses of territory and their clashes between rural activities of traditional communities are presented, from planning to beginning of the operation of wind projects, and the problem of socio-environmental conflicts is identified through an economic, social and environmental vision. Definition of socio-environmental conflicts has had its relevance in the research due to the way they work. Thus, it was possible to notice that socio-environmental conflicts that occur are not spontaneous consequences of the processes of use and exploitation of its resources, but produced from the different forms of appropriation of the territory, which are mediated by unequal power relations. Finally, the research demonstrates mitigating and compensatory practice for socio-environmental impacts and conflicts, aiming at the interest in reconciling uses of territories for conservation with the generation of wind energy and promoting social and environmental development, through fair, equitable, direct and/or indirect access, to available environmental resources and legal use by local communities. Tese de doutoramento em Geografia (especialidade de Geografia Física e Estudos Ambientais)
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2022 PortugalAuthors: Martins, Hugo Miguel Gomes;handle: 1822/81485
A construção sustentável representa hoje em dia, uma elevada preocupação nas sociedades. Esta preocupação traduz-se na procura de um desenvolvimento económico capaz de permitir um equilíbrio social e um mínimo impacte ambiental. Contudo, o desenvolvimento de todas as atividades económicas está associado ao consumo de energia, na sua maioria de origem fóssil, impactantes no meio ambiente por meio da libertação de gases com efeito de estufa. O setor da construção em Portugal é um grande consumidor, tanto na fase de construção, como na fase de uso dos edifícios, apresentando um vasto parque habitacional, pouco eficiente energeticamente, e com elevado potencial de reabilitação ao nível térmico. A presente dissertação foi desenvolvida no contexto da alteração, verificada em 2021, à legislação nacional sobre a certificação energética de edifícios de habitação (REH). Após a introdução ao tema, da estrutura da dissertação, e das atividades desenvolvidas, procede-se à descrição dos documentos regulamentares (Decretos-Lei, Despachos e Portarias) e, respetivas atualizações referentes ao comportamento térmico dos edifícios em Portugal. Tendo a ADENE, a responsabilidade pela gestão deste sistema nacional de certificação. À luz do novo Regulamento e Sistema de Certificação Energética, pretende-se perceber qual a influência do mesmo nos consumos energéticos estimados, no conjunto das edificações construídas ou reabilitadas a partir de 2021, e avaliar o grau de exigência da nova legislação de regulamentação das caraterísticas de comportamento térmico dos edifícios, Decreto-Lei n.º 101-D/2020 de 7 de dezembro, face ao antigo regulamento, Decreto-Lei n.º 118/2013, de 20 de agosto. Para o efeito, foi utilizado um edifício de habitação, como caso de estudo, de aplicação dos modelos de simulação, de acordo com as regras e requisitos em ambas as regulamentações. Foram identificadas as principais diferenças, as exigências e os impactos nas soluções construtivas do edifício, decorrentes da aplicação das mesmas. Como era espectável, um edifício concebido à luz da anterior legislação com uma classificação energética inferior a A, como é o caso do edifício do caso de estudo, terá que ser objeto de uma intervenção de reabilitação energética para conseguir cumprir com os requisitos da atual legislação. Sustainable construction is nowadays a major concern in societies. This concern is reflected in the search for economic development allowing social balance and minimal environment impact. However, the development of all economic activities is associated with the consumption of energy, mostly of fossil origin, which impacts the environment through the release of greenhouse gases. The Construction sector in Portugal is a major consumer of these energies, both in the construction phase, and in the use phase of buildings, presenting a vast housing stock, not very energy efficient, and with high potential for thermal rehabilitation. This dissertation was developed in the context of the change made in 2021 to the national legislation on the energy certification of residential buildings (REH). After introducing the dissertation’s structure topic and the activities carried out, the procedure is to describe the regulatory documents (Decrees-Law, Dispatches and Ordinances) and their respective updates regarding the thermal behaviour of buildings in Portugal. ADENE is responsible for managing this national certification system. The goal is to understand the influence of the new Regulation and Energy Certification System, Decree Law n.º 101-D/2020, December 7th , in the estimated energy consumption of new or rehabilitated sets of buildings from the year of 2021, and to assess the demanding level of the regulatory legislation of the building’s thermic behaviour characteristics, comparing to Decree-Law n.º 118 / 2013, August 20th . For this purpose, a residential building was analysed, as a case study, in the context of the new regulations regarding its energy performance, referring to its heating and cooling needs. Two analyses were made, the first consisted of evaluating the thermal behaviour of the building by REH 2018, and the second aimed to evaluate the same behaviour, but by HAB 2020 standards. As expected, a building designed according to the previous legislation with an energy rating lower than A will have to be subjected to an energy rehabilitation intervention to be able to comply with the requirements of the current legislation, which is the case of the building used in the study. Dissertação de mestrado integrado em Engenharia Civil
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2021 PortugalAuthors: Fernandes, Ana Maria Magalhães;handle: 1822/76585
Atualmente vivemos numa era em que a preocupação com a ecologia e a sustentabilidade é de extrema importância. Nas diferentes áreas do saber, é urgente tornar esta preocupação um foco e adaptar a vida das sociedades a uma realidade mais sustentável a todos os níveis: ambiental, social e económico. O recurso ao veículo de transporte individual como forma de transporte principal veio, aliado ao crescimento demográfico, trazer cenários caóticos às cidades. Por isso, é necessário repensar a mobilidade dentro das mesmas para consequentemente melhorar a qualidade de vida dos cidadãos. Especificamente aplicado à cidade de Braga, o projeto consistirá em, depois de uma análise acerca da mobilidade dentro da cidade e da evolução estrutural e demográfica ao longo dos anos, fazer uma proposta para melhorar e reestruturar o sistema de mobilidade de modo a alinhar o perfil da cidade com as exigências requeridas, em prol de um futuro mais sustentável. We currently live in an era in which the concern around ecology and sustainability is of utmost importance. In all the different areas of knowledge, it is urgent to make this concern a priority and to adapt our societies lives to a more sustainable reality at all levels: ecology, social and economic. The use of the individual transportation methods as the main form of transportation, along with the demographic growth, has brought chaotic scenarios to cities. Therefore, it is necessary to rethink mobility within them to consequently improve the quality of life to all citizens. Specifically focusing to the city of Braga, the project will consist in, after an analysis about the mobility within the city and the structural and demographic evolution the city had over the years, making a proposal to improve and restructure the mobility system in order to align the city’s profile with the requirements towards a more sustainable future. Projeto de mestrado integrado em Arquitetura
Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2021License: CC BYData sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 203visibility views 203 download downloads 91 Powered bymore_vert Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2021License: CC BYData sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2022 PortugalAuthors: Menten, Guilherme Scatolini;handle: 1822/86449
Entre os impactos esperados das alterações climáticas estão a intensificação do aumento do nível médio do mar e a alteração dos padrões pluviométricos regionais. Os estuários estão entre as zonas mais vulneráveis a esses efeitos, sendo assim necessário entender os impactos nos mesmos para melhor planear ações de mitigação e aumento da resiliência. Neste trabalho foi aplicada modelação numérica, através do software Delft3D, para simular os efeitos na intrusão salina do estuário do Rio Minho sob os cenários RCP4.5 e RCP8.5, adotados pelo IPCC. Os caudais fluviais são regulados por diversas barragens, sendo influenciados apenas de forma indireta pelas alterações nos padrões pluviométricos. Assim, foi estudada a variação dos caudais de modo a apoiar futuras ações de planeamento e eventuais revisões das regras de operação dessas barragens para limitar a intrusão salina. Verificou-se o aumento da intrusão salina a montante do estuário com o aumento do nível do mar e a diminuição dos caudais fluviais chegando, no pior caso, à extensão de 28,9 km a partir da foz do estuário, o que poderá implicar com os usos da água nesta região. A extensão da intrusão salina apresenta maior dependência em relação às variações de caudal em situações de seca. Assim, nos casos mais críticos, ou seja, com maior intrusão salina, o caudal fluvial demonstrou ser o fator de maior importância, sendo a sua regularização uma ferramenta de controlo da extensão da intrusão salina no estuário. Among the expected impacts of climate change are the increased mean sea level rise and the changes in regional rainfall patterns. Estuaries are among the most vulnerable areas to these effects, so it is necessary to understand their impacts to better plan mitigation actions and increase resilience. Numerical modeling was applied in this work, using the Delft3D software, to simulate the effects of saline intrusion in the Minho River estuary under RCP4.5 and RCP8.5 scenarios adopted by the IPCC. In this case, the river`s flow is regulated by several dams, and the flow that reaches the estuary is only indirectly influenced by changes in rainfall patterns. Thus, the variation of river flows was studied in order to support future planning actions and revision of the dam discharges rules that should be followed to control salt intrusion. An increase in salt intrusion was observed at the upstream estuary with an increase in the sea level and the decrease in river flows reaching, in the worst case, the extension of 28.9 km from the estuarine mouth, which can bring several impacts to the different water uses in the region. The extent of salt intrusion showed a greater dependence on river flows variations under drought conditions. Thus, in the most critical cases, that is, with greater salt intrusion, the river flow proved to be the most important factor, and its control is an efficient tool to limit the extent of salt intrusion in the estuary. Agradeço também ao projeto EsCo-Ensembles (PTDC/ECI-EGC/30877/2017), cofinanciado por NORTE2020, Portugal 2020 e a União Europeia através do ERDF, e FCT através de fundos nacionais, cujos financiamentos apoiaram a criação do modelo utilizado, assim como de parte dos dados. Dissertação de mestrado em Engenharia Urbana
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2018 PortugalPublisher:Universidade Nova de Lisboa. Centro Interdisciplinar de Ciências Sociais (CICS.NOVA) Authors: Balbé, Alice;handle: 1822/70440
Diariamente, milhões de pessoas acedem às redes sociais para visualizarem e publicarem conteúdos, sejam eles textos, imagens ou vídeos, o que envolve também o consumo e disseminação de notícias e opiniões. Estes novos espaços comunicacionais já fazem parte do cotidiano de grande parte das sociedades contemporâneas, principalmente dos jovens, e como um suporte de informação variada são relevantes para a investigação em diversas áreas, como a comunicação sobre as alterações climáticas que é o foco deste artigo. As características mensagens curtas e a instantaneidade provocada pela pergunta de abertura “o que está acontecendo?”, fizeram com que a rede social Twitter chegasse a ser apontada como canal de organização de mobilizações como Occuppy Wall Street e a Primavera Árabe. O uso de termos supervalorizados como a “revolução do Twitter” atraíram a atenção da academia para estudos sobre interação e participação online. O Twitter já foi classificado como um termômetro da percepção pública (Brown & Wake, 2015) e no caso da comunicação sobre as alterações climáticas, foi caracterizado como uma rede distribuída de sensores (Kirilenko et al., 2015). Devido a possibilidade de pesquisa e da agregação de publicações por termos-chave (e hashtags) cria-se um ambiente segmentado por tema, permitindo identificar os conteúdos mais valorizados dentro da rede social. Desta forma, este trabalho analisa os termos-chave mais utilizados para se referir às alterações climáticas em português e espanhol, no período de seis meses, incluindo o período de realização da 21ª Conferência das Partes (COP21) da Convenção-Quadro das Nações Unidas sobre as Alterações Climáticas. Buscou-se compreender quais os conteúdos mais relevantes nesta rede social, o impacto da realização da COP21 e a influência da mídia, como também tentar perceber os usos da rede social no contexto da comunicação sobre as alterações climáticas. Entre os resultados, a mídia é referência importante dentro da rede social e conteúdos sobre consequências negativas tiveram destaque. Houve variação nas temáticas dos conteúdos comparativamente entre os dois períodos da análise. Daily, millions of people access social networks to view and to publish content in text, photo or video format, which also includes consuming and disseminating news and opinions. In fact, these new communication spaces are already part of everyday life in most contemporary societies, especially among young people. As a support for diverse information, they consist in a relevant research subject in several areas, for instance, communication on climate change, which is the focus of this research work.The short messages and instantaneousness characteristics combined with the opening question “what is happening?”, have led the social network Twitter to be designated as a channel of mobilization organization such as Occupy Wall Street and the Arab Spring. Related to overvalued terms like “Twitter revolution's” it has attracted the academy attention towards investigating the online interaction and participation. The Twitter has already been classified as thermometer of public perceptions (Brown & Wake, 2015) and in the case of climate change communication, Twitter users were considered a distributed network of sensors (Kirilenko et al., 2015). Due to the possibility of searching and aggregating publications by keywords (and hashtags), a segmented environment is created by subjects, allowing to identify the most valuable contents within the social network. In this way, this paper analyses keywords used to refer climate change in Portuguese and Spanish over a period of six months, including the 21st Conference of the Parties (COP21) of the United Nations Framework Convention on Climate Change. It aims to understand the most relevant contents in this social network, the impact of COP21 and the media influence. In addition, it addresses the uses of such social network in the context of communication on climate change. among the results, the analysis found the media is an important reference within the social network and contents about negative consequences have been highlighted. There was variation in content themes comparatively between the two periods of analysis.
Universidade do Minh... arrow_drop_down Universidade do Minho: RepositoriUMOther ORP type . 2018Data sources: Universidade do Minho: RepositoriUMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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