77 resultados para Materiais de mudança de fase (PCM)

em Universidade do Minho


Relevância:

100.00% 100.00%

Publicador:

Resumo:

Este trabalho visa, em primeiro lugar, a caracterização experimental do comportam ento de argamassas com materiais de mudança de fase (PCM) incorporados através de agregados leves, comparativamente com argamassas de referência sem incorporação de PCM. Verifica-se que a aplicação de argamassas com PCM em camadas de desgaste de pavimentos contribui para a minimização dos potenciais efeitos negativos de gelo e degelo. Os estudos experimentais permitem concluir que o método utilizado de impregnação de PCM em materiais porosos, para posterior incorporação em argamassa ou betão, é um método simples, mas muito eficaz. Os resultados indicam ainda que os materiais compósitos com PCM incorporado, podem melhorar a inércia térmica, bem como, atrasar o tempo de eventual ocorrência de congelamento sob a camada de desgaste de um pavimento

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Dissertação de mestrado integrado em Engenharia Civil

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Dissertação de mestrado em Sustentabilidade do Ambiente Construído

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Tese de Doutoramento em Engenharia Civil.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Dissertação de mestrado integrado em Engenharia Mecânica

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Nowadays, considering the high variety of construction products, adequate material selection, based on their properties and function, becomes increasingly important. In this research, a ranking procedure developed by Czarnecki and Lukowski is applied in mortars with incorporation of phase change materials (PCM). The ranking procedure transforms experimental results of properties into one numerical value. The products can be classified according to their individual properties or even an optimized combination of different properties. The main purpose of this study was the ranking of mortars with incorporation of different contents of PCM based in different binders. Aerial lime, hydraulic lime, gypsum and cement were the binders studied. For each binder, three different mortars were developed. Reference mortars, mortars with incorporation of 40% of PCM and mortars with incorporation of 40% of PCM and 1% of fibers, were tested. Results show that the incorporation of PCM in mortars changes their global performance.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Relatório de estágio de mestrado em Educação Pré-Escolar e Ensino do 1º Ciclo do Ensino Básico

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Relatório de estágio de mestrado em Educação Pré-Escolar e Ensino do 1.º Ciclo do Ensino Básico

Relevância:

30.00% 30.00%

Publicador:

Resumo:

The use of thermal insulation materials for the achievement of energy efficient buildings intended, in most cases, the fulfilment of the required heating and cooling needs of the operational phase. The main goal of this paper is â by using exploratory methodology, namely literature review â identify more sustainable insulating materials and, concomitantly, exposing the paradoxical effect of other insulation materials with high Global Warming Potential (GWP) highlighting the role of the Life Cycle Assessment (LCA), Ecodesign and Environmental Product Declaration (EPD) tools for the framing, comparison and selection of materials. As a main conclusion, it is noticed the lack of environmental information from the producers which, together with acquisition prices that do not internalize Life Cycle Costs (LCC), has led to the use of insulation materials with high carbon footprint and to the "isolation paradox" as well.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Dissertação de mestrado integrado em Engenharia Eletrónica Industrial e de Computadores

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Dissertação de mestrado integrado em Engenharia Civil

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Relatório de estágio de mestrado em Património e Turismo Cultural

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Dissertação de mestrado em Biofísica e Bionanossistemas

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Relatório de estágio de mestrado em Ensino de Português no 3º Ciclo do Ensino Básico e Ensino Secundário e de Espanhol nos Ensinos Básico e Secundário

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Currently we are witnessing a huge concern of society with the parameters of comfort of the buildings and the energetic consumptions. It is known that there is a huge consumption of non-renewable sources of energy. Thus, it is urgent to develop and explore ways to take advantage of renewable sources of energy by improving the energy efficiency of buildings. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside buildings, contributing to the thermal comfort and reduction of the use of heating and cooling equipment, using only the energy supplied by the sun. However, the incorporation of phase change materials in mortars modifies its characteristics. The main purpose of this study was mechanical and thermal characterization of mortars with incorporation of PCM in mortars based in different binders. The binders studied were aerial lime, hydraulic lime, gypsum and cement. For each type of binder a reference composition (0% PCM) and a composition with incorporation of 40% of PCM were developed. It was possible to observe that the incorporation of PCM in mortars caused differences in properties such as workability, compressive strength, flexural strength and adhesion, however leads to an improvement of thermal behavior.