Análise termográfica da temperatura superficial de telhas

Abstract

R ESU M ONeste trabalho objetivou-se realizar imagens termográficas da superfície de telhas visando avaliar sua temperatura superficial. Os tratamentos mensurados se constituíram de: T1 -Telha Coppo Venneto Ondulada Cinza; T2 -Telha Coppo Venneto Ondulada Marfim; T3 -Telha Plana Marfim; T4 -Telha Plana Cinza; T5 -Telha de Barro Colonial esmaltada; T6 -Telha Ondulada de Cimento Amianto e T7 -Telha de Barro Francesa. Cada unidade experimental foi composta de três telhas sobrepostas uma sobre a outra, exceto no tratamento de telha ondulada de cimento amianto. O delineamento experimental foi em blocos casualizados com três repetições. Os dados coletados em cada horário foram analisados por meio do modelo de medidas repetidas, utilizando-se o procedimento MIXED do SAS. As temperaturas da superfície inferior das telhas foram muito parecidas ao longo do dia. As telhas com coloração marfim obtiveram melhores valores de temperatura superior e inferior que as telhas com coloração cinza, nas respectivas categorias. A telha de barro colonial obteve maior temperatura da superfície inferior que as demais telhas. Palavras-chave: ambiência animal, conforto térmico, tipos de cobertura, telhadoThermographic analysis of the superficial temperature of roof tiles A B ST R A C T The objective of study was to get thermographic images from the surface of roof tiles to evaluate their tempertures. The evaluated treatments were: T1 -grey Coppo Venneto wave tiles ; T2 -Ivory-colored Coppo Venneto wave tiles; T3 -Ivory-colored, plain tile; T4 -plain, grey roof tile; T5 -glazed clay colonial tile; T6 -Asbestos wave tile T7 -French clay tiles . Each treatment was made up of three tiles which were piled one top of the other, except for the asbestos tiles. The experimental design was in randomized block with three repetitions. The data which were collected in each set time were analyzed through the repetitive measure model, using the MIXED procedure -SAS. The temperatures of the inferior surface of the tiles were very similar throughout the day. The ivory colored tiles had better superior and inferior temperature than the grey-colored ones in their respective category. The glazed, clay colonial tile presented a larger temperature of inferior surface than the other tiles.

Thermal behavior of alternative materials used as roof and efficiency of the reflective painting on the external face

“…The EST behavior reflected in the IST behavior, and in this study, the treatment that presented the worst thermal performance, with lower capacity reduction of EST and IST was the FB treatment, while the BAP and FBP treatments showed the best performance, reinforcing the reflective paint efficiency in reducing heat absorption by the roof. Moreover, [27] found smaller values of EST in light-colored roofing in relation to the dark-colored roofing, verifying that the behavior of EST also influenced the IST behavior, similar to that observed in this study, where roofing with higher EST values had higher IST values and roofing with lower EST values had lower IST values. Likewise, [22] also found a higher thermal efficiency on roofs using reflective paint on the outer face, observing significantly lower values of EST on the tiles with the use of this artifice.…”

Condicionamento térmico primário de instalações rurais por meio de diferentes tipos de cobertura

“…Esta condição deve ser confirmada por meio da avaliação dos índices de conforto, por considerar o efeito da transferência de calor sensível e latente (Abreu et al, 2011 A cobertura verde reduziu a temperatura da superfície do telhado por acrescentar camadas de isolamento que desaceleram o fluxo de calor através da cobertura. Com isto, menor energia térmica é transferida do telhado para o interior do abrigo (Gartland, 2010).…”

Thermal efficiency of individual shelters for girolando calves in brazilian semi-arid regions

“…However, after two hours, this same surface begins to lose heat to the environment; and these values decrease at next hour (5 pm). Subsequently, this energy is transmitted by conduction between material particles or molecules, heating thus the inner face of the roof (ABREU et al, 2011). Based on the above, we can see that lower surface temperatures were numerically higher than the upper ones at 5:00 pm.…”

“…Nevertheless, it is important to note that lower temperatures on tile surfaces do not mean animal thermal comfort; this condition should be reasserted by measuring the RTL, to which animals are subjected (ABREU et al, 2011).…”