12 research outputs found

    Staying Cool: Towards an Integrated Vulnerability Approach to Climate Change in Southern Europe Housing

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    Climate change is increasingly recognized as a reality that requires action, not only by society in general but also by policy decision-makers and scholars. In addition to the increase in mean temperatures, climate models indicate an increase in frequency and severity of extreme events, such as heatwaves. Therefore, indoor environmental conditions in existing residential buildings can be significantly affected, since these were not initially designed to endure such conditions. These changes may compromise their ability to moderate outdoor temperatures, particularly in regions such as Southern Europe, where most buildings still rely on natural ventilation. This work aims to approach this topic by integrating two different interpretations of vulnerability ‚Äď outcome and contextual vulnerability ‚Äď, with the purpose of providing information to support policy design and decision-making, and also the development of retrofit interventions. Using a case study from Lisbon (Portugal), four studies were developed independently based on different methodologies, including thermal modelling and questionnaires. Results from thermal simulations suggest that construction type seems to be determinant in defining the building‚ÄĚs ability to moderate high outdoor temperature. Findings also indicate that it is possible to offset or reduce the effect of the increase in temperatures by means of cost-effective passive measures applied to the building envelope. Some non-physical characteristics such as occupancy and window control are also significant, allowing up to a 91% reduction in discomfort hours. Although useful, this view does not reflect all facets of vulnerability to high temperatures, as simulated behavior cannot illustrate the diversity of practices adopted by occupants nor the context where they occur, For this reason, statistical techniques such as factor and variance analysis were applied to data obtained from a survey to buildings‚ÄĚ occupants and allowed to characterize occupant behavior in two main types of practices ‚Äď personal and environmental. Results suggest a statistically significant variance of socio-demographic, personal and contextual factors in relation to the individual adoption of adaptive practices. In particular, building characteristics, age and sex of occupants seem to be relevant in terms of behaviour towards the provision of comfortable conditions. Integration of results regarding the two interpretations, namely regarding the relation between occupant and the building, support the socio-technical perspective of comfort and highlight the need for a systemic view over high-temperature vulnerability in planning retrofit interventions and designing adaptation policy instruments, including the use of policy mix and integration with other sectors

    Multidimensional perspectives for energy poverty sustainable mitigation

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    Energy poverty is a growing societal issue that puts the welfare of many citizens on both sides of the global north-south divide at risk [...

    O potencial das interven√ß√Ķes de renova√ß√£o a n√≠vel urbano para edif√≠cios nZEB - IEA EBC Annex 75

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    A um nível urbano, o equilíbrio entre a aplicação de medidas de eficiência energética e o uso de energia renovável para a renovação do edificado existente com o objetivo nZEB é mais complexa que ao nível dos edifícios individuais, mas pode tirar partido de potenciais vantagens inerentes à economia de escala que se pode conseguir e às sinergias entre medidas a aplicar.info:eu-repo/semantics/publishedVersio

    A prefabricação modular na reabilitação energética como contributo para assegurar edifícios nZEB

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    O processo de reabilita√ß√£o energ√©tica do parque edificado coloca in√ļmeros desafios, para os quais √© necess√°ria uma estrat√©gia que combine inova√ß√£o de produto e de processos, optimiza√ß√£o de custos e uma abordagem inovadora ao mercado. Neste contexto, as solu√ß√Ķes prefabricadas modulares na renova√ß√£o de edif√≠cios s√£o um caminho a ser explorado. A este tipo de solu√ß√Ķes √© reconhecido o potencial para uma optimiza√ß√£o de processos de fabrico e consequente redu√ß√£o de custos, assim como para a redu√ß√£o de tempos de interven√ß√£o e de dist√ļrbios causados aos utilizadores dos edif√≠cios, ao mesmo tempo que aumenta a qualidade e efici√™ncia energ√©tica das edifica√ß√Ķes. Neste artigo √© apresentado de forma geral o projeto de investiga√ß√£o europeu More-Connect, no qual o Centro de Territ√≥rio, Ambiente e Constru√ß√£o (CTAC) da Universidade do Minho participa, e que tem como objectivo principal o desenvolvimento de solu√ß√Ķes modulares que permitam, em conjuga√ß√£o com a aplica√ß√£o de sistemas eficientes, alcan√ßar edif√≠cios com necessidades energ√©ticas quase nulas (nZEB) ou nulas (ZEB), numa perspectiva de rentabilidade econ√≥mica.info:eu-repo/semantics/publishedVersio

    Os co-benefícios associados às medidas de melhoria da eficiência energética nos edifícios

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    N√£o descurando o peso significativo que as poupan√ßas de energia e custos possam ter na decis√£o de levar a cabo uma interven√ß√£o de reabilita√ß√£o, h√° outros benef√≠cios adicionais decorrentes destas interven√ß√Ķes que, se n√£o considerados, levam √† subestima√ß√£o do valor real das melhorias implementadas, facto agora enfatizado na revis√£o de 2018 da diretiva do desempenho energ√©tico de edif√≠cios

    Reabilitação nZEB e pobreza energética na Habitação social

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    Para alívio da pobreza energética, é fundamental identificar as medidas mais adequadas e mais rentáveis a aplicar em edifícios de habitação social e garantir que os investimentos necessários resultem em necessidades energéticas compatíveis com os rendimentos da população residente neste tipo de edifícios

    Os instrumentos de políticas para o desafio da reabilitação energética dos edifícios no Pacto Ecológico Europeu

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    O Pacto Ecológico Europeu lançou um desafio sem precedentes relativamente à necessidade de duplicar as taxas de reabilitação energética do edificado. Apesar de o potencial do investimento prometido para apoiar a transição necessária ser grande, é necessário que os instrumentos de políticas utilizados sejam adequadamente desenhados, pois a sua implementação é fortemente influenciada pelo contexto local

    Efici√™ncia energ√©tica e rentabilidade nas interven√ß√Ķes de reabilita√ß√£o nZEB √† escala do bairro

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    A reabilita√ß√£o energ√©tica do parque edificado existente √© crucial para que se consigam cumprir os objetivos delineados pela Uni√£o Europeia para 2050. De facto, a responsabilidade dos edif√≠cios j√° constru√≠dos na percentagem das emiss√Ķes de carbono relacionadas com o uso de energia est√° bem estabelecida e √© muito significativa. No caso dos edif√≠cios residenciais, estes s√£o respons√°veis por cerca de 36% das emiss√Ķes de carbono [1]

    O papel da reabilitação nZEB no combate à pobreza energética

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    A reabilita√ß√£o nZEB pode ter um papel preponderante no combate √† pobreza energ√©tica, proporcionando, para al√©m de uma poupan√ßa significativa de energia, condi√ß√Ķes interiores saud√°veis e resili√™ncia relativamente a eventuais subidas dos custos de energia

    Cooling degree models and future energy demand in the residential sector. A seven-country case study

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    The intensity and duration of hot weather and the number of extreme weather events, such as heatwaves, are increasing, leading to a growing need for space cooling energy demand. Together with the building stock‚Äôs low energy performance, this phenomenon may also increase households‚Äô energy consumption. On the other hand, the low level of ownership of cooling equipment can cause low energy consumption, leading to a lack of indoor thermal comfort and several health-related problems, yet increasing the risk of energy poverty in summer. Understanding future temperature variations and the associated impacts on building cooling demand will allow mitigating future issues related to a warmer climate. In this respect, this paper analyses the effects of change in temperatures in the residential sector cooling demand in 2050 for a case study of nineteen cities across seven countries: Cyprus, Finland, Greece, Israel, Portugal, Slovakia, and Spain, by estimating cooling degree days and hours (CDD and CDH). CDD and CDH are calculated using both fixed and adaptive thermal comfort temperature thresholds for 2020 and 2050, understanding their strengths and weaknesses to assess the effects of warmer temperatures. Results suggest a noticeable average increase in CDD and CDH values, up to double, by using both thresholds for 2050, with a particular interest in northern countries where structural modifications in the building stock and occupants‚Äô behavior should be anticipated. Furthermore, the use of the adaptive thermal comfort threshold shows that the projected temperature increases for 2050 might affect people‚Äôs capability to adapt their comfort band (i.e., indoor habitability) as temperatures would be higher than the maximum admissible values for people‚Äôs comfort and health.The paper stems from collaborative work within COST Action ‚ÄėEuropean Energy Poverty: Agenda Co-Creation and Knowledge Innovation‚Äô (ENGAGER 2017‚Äď2021, CA16232) funded by European Cooperation in Science and Technology‚ÄĒwww.cost.eu (5 December 2020). Jo√£o Pedro Gouveia and Pedro Palma acknowledge and are thankful for the support provided to CENSE by the Portuguese Foundation for Science and Technology (FCT) through the strategic project UIDB/04085/2020 and through the scholarship SFRH/BD/146732/2019 provided to Pedro). Ricardo Barbosa acknowledges the support for this work, which was partly financed by FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020
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