Avec l’apparition des systèmes PV en toiture et des véhicules électriques, le nouveau contexte énergétique au sein du bâtiment pose, sous un nouvel angle, la question de la distribution en courant continu au sein des bâtiments. Mais comment évaluer objectivement l’intérêt d’un réseau DC ? Dans un contexte où l’énergie et les impacts environnementaux prennent chaque jour plus d’importance, la quantification des performances d’un tel système selon sa seule phase d’usage ne répond pas complètement à la question son impact global. C’est pourquoi nous proposons d’aborder la question via l’éco-dimensionnement des composants constituant ce système. Pour simplifier un problème fondamentalement complexe (multi-critères), nous avons choisi d’effectuer ces dimensionnements sur la base de la minimisation de leur consommation d’énergie primaire sur l’ensemble de leur cycle de vie (pertes + énergie grise = Gross Energy Requirement GER). L’un des objectifs étant d’apporter à la fois une méthodologie mais aussi les premiers éléments qui permettront de déterminer un optimum du niveau de tension d’une distribution en courant continu dans les bâtiments. / Since the development of roof PV systems and electric vehicles, the use of DC distribution for building has to be explored. However, an objective criterion has to be used to evaluate the interest of such distribution. While energy consumption and environmental impact criteria gain in importance, the performance quantification of such system over the use phase is not sufficient to illustrate its whole impact. That’s why we propose to tackle this evaluation through the eco-sizing of distribution component. In order to simplify this complex problem, based on a multi-criterion approach, we propose to size the components based on the minimization of their primary energy consumption over their entire life cycle. The resulting Gross Energy Requirement GER includes the embodied energy and the losses during the use phase. The objectives are to propose a methodology to determine the optimal voltage level for the building DC distribution, and also to illustrate the proposed approach from case studies. This methodology is applied on wiring and DC/DC converters.

Submitted by Maicon Juliano Schmidt (maicons) on 2015-07-03T19:26:11Z No. of bitstreams: 1 Eduardo Reuter Schneck.pdf: 5168869 bytes, checksum: 117b2eaaed9751212603a9e4d30d8740 (MD5) / Made available in DSpace on 2015-07-03T19:26:11Z (GMT). No. of bitstreams: 1 Eduardo Reuter Schneck.pdf: 5168869 bytes, checksum: 117b2eaaed9751212603a9e4d30d8740 (MD5) Previous issue date: 2013-01-15 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Nos últimos anos, tem sido expressiva a oferta de unidades habitacionais em empreendimentos habitacionais de interesse social (EHIS), sendo a maioria fomentada por programas de subsídio e financiamento do governo federal. Em contrapartida, o grande número de obras acaba por aumentar os impactos ao meio ambiente, inerentes ao processo de produção dos edifícios. Além disso, verifica-se no setor uma preferência por edificações cujo tipo arquitetônico adotado é possivelmente mais oneroso do que outras alternativas, além de uma reduzida qualidade das unidades habitacionais. Portanto, a eficiência na execução destes empreendimentos é um aspecto relevante no que diz respeito à otimização no uso dos recursos - tanto naturais como financeiros. No âmbito do conceito do tripé da sustentabilidade, torna-se fundamental o conhecimento das relações do tipo arquitetônico e demais decisões tomadas na etapa de projeto, quando se tem maior influência em fatores que podem reduzir custos, aprimorar quesitos de habitabilidade e ainda minimizar os impactos ambientais. Neste sentido, o objetivo principal desta pesquisa é investigar a influência do tipo arquitetônico em impactos ambientais, no custo e em quesitos de habitabilidade em empreendimentos habitacionais de interesse social (EHIS). Para tanto, foi utilizado o projeto e o orçamento de um EHIS localizado no município de São Leopoldo/RS, fornecidos por uma empresa construtora e cujo tipo arquitetônico com planta em forma H é amplamente difundido na região. A partir desse projeto, denominado Projeto-base, foram feitas simulações do tipo arquitetônico visando aprimorar quesitos de habitabilidade e aumentar o índice econômico de compacidade (IeC), partindo do pressuposto de que com o aumento do IeC reduz-se a quantidade de materiais aplicados nos projetos e, consequentemente, minimiza-se os impactos ambientais além dos custos de produção. Os projetos simulados, denominados Projetos-propostos, tiveram a energia incorporada (EI) e a emissão de CO2 dos materiais estimadas, com o intuito de compará-las com o Projeto-base. Em seguida, foram investigadas as diferenças no custo e também em quesitos de habitabilidade, visando à comparação entre o Projeto-base e os Projetos-propostos. Os resultados apontam para uma redução de 7% da EI e 8% de emissão de CO2 em benefício do projeto-proposto. Em termos de custos de produção, o projeto-proposto apresentou redução de 7%, além de melhorias nos quesitos de habitabilidade como conforto térmico e lumínico, funcionalidade e flexibilidade de planta. / In recent years, there has been a significant supply of housing units in social housing design (SHD), mostly fomented by grant programs and federal government funding. In contrast, the large number of works ultimately increase environmental impacts, inherent in the process of buildings production. Still, there are lots of buildings whose architectural type adopted are demonstrably more expensive than other alternatives, with a reduced quality in housing units. Therefore, the efficient implementation of these projects is an important aspect with regard to optimizing the use of resources - both natural and financial. Under the concept of the triple bottom line, it is crucial to understand the relationships of the type and other architectural decisions taken at the design stage, when it has the greatest influence on factors that can reduce costs, improve habitability and also minimize the environment impacts. In this sense, the main objective of this research is to investigate the influence of architectural type in environmental impacts, cost and habitability in social housing design (SHD). For this, we used the design and budget of a SHD located in São Leopoldo/RS and whose H-shaped design is widespread in the region. From that project, called Base-project, simulations were made of plants aiming to improve habitability questions and increase the economic index of compactness (EIC), on the assumption that with increasing EIC it is possible to reduce the amount of materials used in projects and hence to minimize environmental impacts and production costs. The Proposed-projects had the embodied energy (EE) and CO2 emissions of materials estimated, in order to compare them with the Base-project. Next, it was investigated the differences in cost and also in habitability, evaluated and compared among all projects. The results indicate a reduction of 7% of EE and 8% of CO2 emissions in favor of the Proposed-project. In terms of production costs, the Proposed-project declined by 7%, in addition to improvements in habitability such as luminic and thermal comfort, functionality and flexibility of the plant.

Submitted by Maicon Juliano Schmidt (maicons) on 2015-08-06T18:22:40Z No. of bitstreams: 1 Renata Postay.pdf: 3569727 bytes, checksum: 4d066a333e97647bdda37f1b5c173ac2 (MD5) / Made available in DSpace on 2015-08-06T18:22:40Z (GMT). No. of bitstreams: 1 Renata Postay.pdf: 3569727 bytes, checksum: 4d066a333e97647bdda37f1b5c173ac2 (MD5) Previous issue date: 2015-03-27 / CNPQ – Conselho Nacional de Desenvolvimento Científico e Tecnológico / Ministério das Cidades / UNISINOS - Universidade do Vale do Rio dos Sinos / A construção civil consome uma grande quantidade de matérias primas e energia. No consumo de energia especificamente, o segmento residencial é muito expressivo pois utiliza o equivalente aos setores comercial e público juntos, em todas as fontes de energia, envolvendo desde a energia para a produção de materiais e componentes, como a energia utilizada na fase de uso das edificações. No Brasil, o setor de habitação de interesse social (HIS) teve um impulso significativo com o Programa Minha Casa Minha Vida (PMCMV), que objetiva a redução do deficit habitacional brasileiro e a promoção do crescimento econômico. Práticas de ações voltadas à economia e otimização da construção, desde a fase de projeto até a execução, são muito oportunas, tendo em vista a atual crise energética que o país vem enfrentando e a escala do segmento de HIS. Neste contexto, o projeto tem papel crucial como indutor da racionalização da construção, pois, a escolha dos materiais e decisões quanto à arquitetura tem influência direta no consumo de materiais e impactos relacionados. O estudo busca investigar o efeito da compacidade do projeto (através do índice econômico de compacidade – IeC) em diferentes sistemas construtivos, utilizados em empreendimentos de habitação de interesse social (EHIS), na energia incorporada (EI) e nas emissões de CO2. A pesquisa analisou cinco projetos de edifícios do PMCMV, e para cada um considerou três sistemas construtivos (alvenaria estrutural com blocos cerâmicos, alvenaria estrutural com blocos de concreto e paredes de concreto). A pesquisa foi conduzida através de três etapas: (1) quantificação dos materiais dos projetos; (2) análise da energia incorporada e emissões de dióxido de carbono (CO2) dos materiais de construção através de dados publicados na literatura e em dados do software Cambridge Engineering Select; (3) verificação da correlação entre compacidade, energia incorporada e emissões de CO2. Quanto ao consumo de materiais, os resultados mostram diferença aproximada de 20% em massa (kg) entre os projetos com menor e maior índice econômico de compacidade, e diferença entre 16% a 20% na análise de EI e emissões de CO2, quando são analisados projetos de um mesmo sistema construtivo. / Civil construction consumes a large amount of raw materials and energy. In energy consumption specifically, the residential segment is very significant because it uses, in all energy sources, the equivalent of the commercial and public sectors together, ranging from the energy to materials and components production, such as the energy used in the use phase of buildings. In Brazil, the social housing sector had a significant growth with the program “Minha Casa Minha Vida (MCMV)” (my house, my life), which aims to reduce the Brazilian housing deficit and to promote economic growth. Actions aimed at saving and optimization of construction are very timely, from the design stage to execution, given the current energy crisis the country is facing, and the scale of social housing segment. In this context, the design plays a crucial role as an inducer of the rationalization of construction, therefore, the choice of materials and decisions on the architecture has a direct influence on materials consumption and related impacts. The study aims to investigate the relationship between design compactness (through economic index of compactness) and construction systems used in social housing developments (EHIS) with embodied energy and CO2 emissions. The research examined five designs of buildings of MCMV, considering construction systems (structural masonry with ceramic bricks, masonry with concrete blocks and concrete walls) for each design. The study was conducted through three steps: (1) quantification of the materials of the designs; (2) analysis of the embodied energy and carbon dioxide (CO2) emissions, from data published in the literature and in the CES Selector software; (3) verification of the relationship between compactness and construction systems, with consumption of EI and CO2 emissions. Regarding the consumption of materials, the results show an approximate 20% difference in weight (kg) between projects with lower and higher economic index of compactness, and the difference between 16% to 20% in EI analysis and CO2 emissions, considering the same construction system.

The assessment of the direct and indirect requirements for energy is known as embodied energy analysis. For buildings, the direct energy includes that used primarily on site, while the indirect energy includes primarily the energy required for the manufacture of building materials. This thesis is concerned with the completeness and reliability of embodied energy analysis methods. Previous methods tend to address either one of these issues, but not both at the same time. Industry-based methods are incomplete. National statistical methods, while comprehensive, are a ‘black box’ and are subject to errors. A new hybrid embodied energy analysis method is derived to optimise the benefits of previous methods while minimising their flaws. In industry-based studies, known as ‘process analyses’, the energy embodied in a product is traced laboriously upstream by examining the inputs to each preceding process towards raw materials. Process analyses can be significantly incomplete, due to increasing complexity. The other major embodied energy analysis method, ‘input-output analysis’, comprises the use of national statistics. While the input-output framework is comprehensive, many inherent assumptions make the results unreliable. Hybrid analysis methods involve the combination of the two major embodied energy analysis methods discussed above, either based on process analysis or input-output analysis. The intention in both hybrid analysis methods is to reduce errors associated with the two major methods on which they are based. However, the problems inherent to each of the original methods tend to remain, to some degree, in the associated hybrid versions. Process-based hybrid analyses tend to be incomplete, due to the exclusions associated with the process analysis framework. However, input-output-based hybrid analyses tend to be unreliable because the substitution of process analysis data into the input-output framework causes unwanted indirect effects. A key deficiency in previous input-output-based hybrid analysis methods is that the input-output model is a ‘black box’, since important flows of goods and services with respect to the embodied energy of a sector cannot be readily identified. A new input-output-based hybrid analysis method was therefore developed, requiring the decomposition of the input-output model into mutually exclusive components (ie, ‘direct energy paths’). A direct energy path represents a discrete energy requirement, possibly occurring one or more transactions upstream from the process under consideration. For example, the energy required directly to manufacture the steel used in the construction of a building would represent a direct energy path of one non-energy transaction in length. A direct energy path comprises a ‘product quantity’ (for example, the total tonnes of cement used) and a ‘direct energy intensity’ (for example, the energy required directly for cement manufacture, per tonne). The input-output model was decomposed into direct energy paths for the ‘residential building construction’ sector. It was shown that 592 direct energy paths were required to describe 90% of the overall total energy intensity for ‘residential building construction’. By extracting direct energy paths using yet smaller threshold values, they were shown to be mutually exclusive. Consequently, the modification of direct energy paths using process analysis data does not cause unwanted indirect effects. A non-standard individual residential building was then selected to demonstrate the benefits of the new input-output-based hybrid analysis method in cases where the products of a sector may not be similar. Particular direct energy paths were modified with case specific process analysis data. Product quantities and direct energy intensities were derived and used to modify some of the direct energy paths. The intention of this demonstration was to determine whether 90% of the total embodied energy calculated for the building could comprise the process analysis data normally collected for the building. However, it was found that only 51% of the total comprised normally collected process analysis. The integration of process analysis data with 90% of the direct energy paths by value was unsuccessful because: • typically only one of the direct energy path components was modified using process analysis data (ie, either the product quantity or the direct energy intensity); • of the complexity of the paths derived for ‘residential building construction’; and • of the lack of reliable and consistent process analysis data from industry, for both product quantities and direct energy intensities. While the input-output model used was the best available for Australia, many errors were likely to be carried through to the direct energy paths for ‘residential building construction’. Consequently, both the value and relative importance of the direct energy paths for ‘residential building construction’ were generally found to be a poor model for the demonstration building. This was expected. Nevertheless, in the absence of better data from industry, the input-output data is likely to remain the most appropriate for completing the framework of embodied energy analyses of many types of products—even in non-standard cases. ‘Residential building construction’ was one of the 22 most complex Australian economic sectors (ie, comprising those requiring between 592 and 3215 direct energy paths to describe 90% of their total energy intensities). Consequently, for the other 87 non-energy sectors of the Australian economy, the input-output-based hybrid analysis method is likely to produce more reliable results than those calculated for the demonstration building using the direct energy paths for ‘residential building construction’. For more complex sectors than ‘residential building construction’, the new input-output-based hybrid analysis method derived here allows available process analysis data to be integrated with the input-output data in a comprehensive framework. The proportion of the result comprising the more reliable process analysis data can be calculated and used as a measure of the reliability of the result for that product or part of the product being analysed (for example, a building material or component). To ensure that future applications of the new input-output-based hybrid analysis method produce reliable results, new sources of process analysis data are required, including for such processes as services (for example, ‘banking’) and processes involving the transformation of basic materials into complex products (for example, steel and copper into an electric motor). However, even considering the limitations of the demonstration described above, the new input-output-based hybrid analysis method developed achieved the aim of the thesis: to develop a new embodied energy analysis method that allows reliable process analysis data to be integrated into the comprehensive, yet unreliable, input-output framework. Plain language summary Embodied energy analysis comprises the assessment of the direct and indirect energy requirements associated with a process. For example, the construction of a building requires the manufacture of steel structural members, and thus indirectly requires the energy used directly and indirectly in their manufacture. Embodied energy is an important measure of ecological sustainability because energy is used in virtually every human activity and many of these activities are interrelated. This thesis is concerned with the relationship between the completeness of embodied energy analysis methods and their reliability. However, previous industry-based methods, while reliable, are incomplete. Previous national statistical methods, while comprehensive, are a ‘black box’ subject to errors. A new method is derived, involving the decomposition of the comprehensive national statistical model into components that can be modified discretely using the more reliable industry data, and is demonstrated for an individual building. The demonstration failed to integrate enough industry data into the national statistical model, due to the unexpected complexity of the national statistical data and the lack of available industry data regarding energy and non-energy product requirements. These unique findings highlight the flaws in previous methods. Reliable process analysis and input-output data are required, particularly for those processes that were unable to be examined in the demonstration of the new embodied energy analysis method. This includes the energy requirements of services sectors, such as banking, and processes involving the transformation of basic materials into complex products, such as refrigerators. The application of the new method to less complex products, such as individual building materials or components, is likely to be more successful than to the residential building demonstration.

Syfte: För nybyggda hus står den inbyggda koldioxiden för en allt större andel av byggnadens klimatpåverkan under livscykeln. Detta på grund av bättre klimatskal och driftsystem. Forskningsrapporter visar att klimatpåverkan i form av inbyggd koldioxid kan minska om digitala analysverktyg används i projekteringen. Syftet med den här rapporten är att undersöka hur analyserna går till samt hur de kan bli enklare och mer noggranna. Metod: För att uppfylla syftet används en litteraturstudie och semistrukturerade intervjuer för att kartlägga användningen av LCA för att dra lärdomar och se förbättringsmöjligheter. En fallstudie görs på en betong- och stålstomme för att jämföra och dra slutsatser utav två LCA-verktyg; Anavitor och Bidcon. Resultat: Resultatet visar att intresset för LCA i byggbranschen är stigande och att de analyser som utförs i projekteringsskedet oftast baseras på generiska värden. Avseende olika programvaror måste omfattningen av programvaran vara tydligt definierad för att kunna få fram ett jämförbart resultat. För att ge ett resultat som speglar det verkliga utfallet måste man frångå den generiska data som tillhandahålls, och istället mata in materialspecifika värden som kommer direkt från tillverkare. Detta kan redan vid projekteringsskedet vara möjligt om BIM-objekt förses med EPD:er i kompatibla filformat. Konsekvenser: Byggnadens totala klimatpåverkan under livscykeln kan tydliggöras med hjälp av LCA-verktyg. För att det ska bli en naturlig del av projekteringen är det viktigt att LCA-verktyg är kompatibla med den information som finns i en eventuell modell. LCA-verktyg bör innehålla mer information än bara klimatpåverkan, även annan miljödata och eventuell ekonomisk information bör finnas för att ge ett bra beslutsunderlag för beställaren. För att öka användningen av LCA i byggbranschen krävs starkare incitament för att göra analyser till exempel att beställaren måste miljödeklarera byggnaden. I ett längre perspektiv borde krav ställas på en byggnads miljöpåverkan liknande de krav som finns i BBR angående energianvändning. Noggrannheten i programmet beror till största del på den data som användaren matar in. Det vill säga mängder, ofta hämtade från en modell. Det krävs att EPD:er görs tillgängliga i filformat som stöds av digitala programvaror för att enklare kunna nå deninformation som krävs. LCA-verktyg ska kunna användas tidigt i ett projekt för att eventuella val lättare ska kunna göras. Samtidigt så bör programanvändaren kunna använda produktspecifika EPD:er i ett tidigt skede för att kunna jämföra olika leverantörer och konstruktionslösningar. Begränsningar: Detta arbete är begränsat till de två programmen Bidcon och Anavitoroch hur de skiljer sig åt avseende beräkningsmetoder och funktioner. Det är ocksåavgränsat för att endast beröra byggnaders inbyggda material. Nyckelord: "Inbyggd koldioxid", "Inbyggd energi", "koldioxidavtryck", "LCA","Livscykelanalys", "Klimatpåverkan", "Klimatdata", "BIM", ”Anavitor”, ”Bidcon” / Purpose: For newly constructed buildings, embodied carbon dioxide stands for an increasing share of the buildings climate impact, seen from a life cycle perspective. This due to improved building envelopes alongside better building service systems. Research shows climate impact due to embodied carbon dioxide may decrease if digital tools for analysis are used during the design phase. The aim with this report is to examine how these analyses are made and see how they can be simplified as well as more accurate. Method: To fulfil the aim of this report a literature review is used alongside semistructured interviews to map the use of LCA (Life Cycle Assessment) in order to gain knowledge and find opportunities for enhancement. A case study is performed on a building frame of concrete and steel to be able to compare and draw conclusions from two LCA-tools; Anavitor and Bidcon. Findings: The result shows increasing interest for LCA in the building industry and that LCA performed in the design phase often uses generic values. The terms and scope of a LCA needs to be determined distinctly regarding comparison of different software's in order to reach a result that is comparable. There is a need to depart from generic values and replace with climate data from manufactures to reach a result reflecting reality. This would be possible already in the design phase using objects in BIM supplemented with climate data from EPD:s in compatible formats. Implications: The buildings total climate impact during the life cycle are able to be displayed with LCA-tools. Using this as a natural part of the design phase, LCA-tools have to be compatible with the information contained in an eventual model. LCA-tools ought to include more information than just climate impact, other environmental data and economic information ought to be included to provide a better decision ground for the buyer. To increase the use of LCA in the building industry, a stronger incentive is needed. The buyer should be required to perform an environmental declaration of thebuilding. In a further step legislation regarding a building´s environmental impactsimilar to the rules found in the Swedish building code regarding specific energy usewould be fitting. The accuracy of the programs mostly depends on the input data,namely quantities, often retrieved from a model. Requires EPD:s accessible in formatsupported by digital software’s in order to reach that information more easily. LCA tools ought to be used early in a project, facilitate eventual choices. At the same time, the user should be able to use product specific EPD:s in an early stage to compare different manufacturers and solutions. Limitations: This paper is limited to the two software’s Bidcon and Anavitor, and how they differ regarding calculation methods and functions. It's also limited to only take the buildings' embedded materials into account. Keywords: "Embodied carbon dioxide", "Embodied energy", "carbon foot print","LCA", "Life Cycle assessment", "Climate impact", "Climate data", "BIM", “Anavitor,“Bidcon”

Buildings are directly responsible for 40% of the final energy use in most developed economies and for much more if indirect requirements are considered. This results in huge impacts which affect the environmental balance of our planet.<p>However, most current building energy assessments focus solely on operational energy overlooking other energy uses such as embodied and transport energy. Embodied energy comprises the energy requirements for building materials production, construction and replacement. Transport energy represents the amount of energy required for the mobility of building users.<p>Decisions based on partial assessments might result in an increased energy demand during other life cycle stages or at different scales of the built environment. Recent studies have shown that embodied and transport energy demands often account for more than half of the total lifecycle energy demand of residential buildings. Current assessment tools and policies therefore overlook more than 50% of the life cycle energy use.<p>This thesis presents a comprehensive life cycle energy analysis framework for residential buildings. This framework takes into account energy requirements at the building scale, i.e. the embodied and operational energy demands, and at the city scale, i.e. the embodied energy of nearby infrastructures and the transport energy of its users. This framework is implemented through the development, verification and validation of an advanced software tool which allows the rapid analysis of the life cycle energy demand of residential buildings and districts. Two case studies, located in Brussels, Belgium and Melbourne, Australia, are used to investigate the potential of the developed framework.<p>Results show that each of the embodied, operational and transport energy requirements represent a significant share of the total energy requirements and associated greenhouse gas emissions of a residential building, over its useful life. The use of the developed tool will allow building designers, town planners and policy makers to reduce the energy demand and greenhouse gas emissions of residential buildings by selecting measures that result in overall savings. This will ultimately contribute to reducing the environmental impact of the built environment. / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished

In the pursuit of low-carbon, renewable energy sources one option with great potential in the UK is tidal energy. Specifically the proposed construction of the Swansea Bay Tidal Lagoon (SBTL) in South Wales has become one such discussed option. With a potential net annual output of 400 GWh and a 120-year lifetime the scheme represents a long-term and large-scale electricity production option. An assessment of carbon emissions and embodied energy (EE) of the lagoon’s life cycle was carried out. Total lifetime carbon emissions for the SBTL are in the region of 470,000 tCO2e and EE was found to be around 7,800 TJ. The assessment shows that the SBTL has significantly lower emissions per year than the existing National Grid mix and with emissions of around 0.01 kgCO2e/KWh is significantly lower than the UK emissions target of 0.07 kgCO2e/KWh. Energy payback of the SBTL was found to be in the region of 5.5 years. The use of dredged ballast infill sourced from within the area of the lagoon plays an important role in keeping emissions and energy use low; and is a key consideration when planning future tidal lagoon structures.