Estudo da refletância e sua influência no comportamento térmico de tintas refletivas e convencionais de cores correspondentes. / Influence of reflectivity on the thermal behavior of color-matched reflective and conventional paints.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The main purpose of this study was to investigate the effect of reflective colored paints and conventional colored paints applied on fiber cement corrugated roofing sheets, proving whether both type of paints can present different reflection characteristics in the infrared solar radiation and high thermal performance. Color and gloss were measured by instrumental methods and reflectivity (reflection coefficient) was measured using spectrophotometers equipped with integrating spheres in free paint films. In order to investigate the thermal performance of reflective and conventional paints, simulation tests were performed in laboratory by IR lamps using fiber cement specimens and in field by exposure solar radiation using prototypes with temperature monitoring. The results showed that the reflective paints present higher reflectivity and better thermal performance than the conventional paint, independently of the color. The results showed that the reflective paints present potential to reduce superficial temperature of fiber cement corrugated roofing sheets. It is necessary to continue the reflective colored paints study on durability and thermal performance by exposure tests.

ASSUNTO(S)

albedo paints reflective paints tintas desempenho térmico spectroscopy analysis análise espectrofotométrica tintas refletivas reflectivity refletância tintas coloridas thermal performance

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