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Avaliação da eficiência de tintas térmicas em período de arrefecimento em edifícios
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A presente dissertação teve como objetivo avaliar, por meio de abordagem experimental, o desempenho térmico de tintas térmicas em comparação a tinta convencional, quando aplicadas nas superfícies interiores e exteriores de paredes no período de arrefecimento. Após prospeção e recolha junto de empresas em Portugal, foram caracterizadas três tintas térmicas brancas e um primário térmico, comparativamente a uma tinta convencional branca. Inicial-mente onze provetes revestidos com as tintas e os sistemas em estudo foram submetidos a ensaio laboratorial para avaliação da refletância. As tintas térmicas estudadas são caracteriza-das por apresentarem alta refletância à radiação solar, quando comparadas às tintas brancas convencionais disponíveis no mercado nacional.
Aplicaram-se os sistemas de pintura no revestimento interior das parede oeste e norte de uma célula experimental localizada no Laboratório Nacional de Engenharia Civil (LNEC), e monitorizou-se na estação de arrefecimento a temperatura superficial através de termopares instalados nas paredes. Foram aplicadas as mesmas tintas em estudo na fachada exterior sul da mesma célula experimental, para avaliar o desempenho térmico através de termografia de infravermelhos na mesma estação.
Os resultados obtidos na avaliação do desempenho térmico das tintas no interior da célula experimental demonstram que as tintas térmicas não apresentam vantagens significativas em comparação com a tinta convencional. Entretanto, quando aplicadas na superfície exterior sul da célula e expostas à radiação solar incidente, as tintas térmicas revelaram desempenho térmico superior comparativamente à tinta convencional, na estação de arrefecimento.
The present dissertation aimed to evaluate, through an experimental approach, the ther-mal performance of thermal paints compared to conventional paint when applied on internal and external wall surfaces during the cooling season. After surveying and collecting data from companies in Portugal, three white thermal paints and one thermal primer were characterized and compared to a conventional white paint. Initially, eleven samples coated with the paints and systems under study were subjected to laboratory testing to evaluate reflectance. The studied thermal paints are characterized by having high reflectance to solar radiation when compared to conventional white paints available in the national market. The painting systems were applied on the inner walls of the west and north façades of an experimental cell located at the National Laboratory of Civil Engineering (LNEC), and the surface temperature was monitored in the cooling season, through thermocouples installed on the walls. The same paints were applied on the south exterior facade of the same experimental cell to evaluate thermal performance through infrared thermography in the same season. The results obtained in the evaluation of paint performance inside the experimental cell demonstrate that the thermal paints do not present significant advantages compared to the conventional paint. However, when applied on the exterior south surface of the cell and ex-posed to incident solar radiation, the thermal paints revealed superior thermal performance compared to conventional paint during the cooling season.
The present dissertation aimed to evaluate, through an experimental approach, the ther-mal performance of thermal paints compared to conventional paint when applied on internal and external wall surfaces during the cooling season. After surveying and collecting data from companies in Portugal, three white thermal paints and one thermal primer were characterized and compared to a conventional white paint. Initially, eleven samples coated with the paints and systems under study were subjected to laboratory testing to evaluate reflectance. The studied thermal paints are characterized by having high reflectance to solar radiation when compared to conventional white paints available in the national market. The painting systems were applied on the inner walls of the west and north façades of an experimental cell located at the National Laboratory of Civil Engineering (LNEC), and the surface temperature was monitored in the cooling season, through thermocouples installed on the walls. The same paints were applied on the south exterior facade of the same experimental cell to evaluate thermal performance through infrared thermography in the same season. The results obtained in the evaluation of paint performance inside the experimental cell demonstrate that the thermal paints do not present significant advantages compared to the conventional paint. However, when applied on the exterior south surface of the cell and ex-posed to incident solar radiation, the thermal paints revealed superior thermal performance compared to conventional paint during the cooling season.
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Revestimento por pinturas fachadas termografia de infravermelhos refletância célula experimental temperatura superficial