Estimating thermal performance of cool colored paints |
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Authors: | Kai L Uemoto Neide MN Sato |
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Affiliation: | a University of São Paulo - Escola Politécnica, Department of Civil Construction Engineering, Av. Prof. Almeida Prado - Trav. 2, no 271, Zip code 05508-900, São Paulo - SP, Brazil b Nove de Julho University, Civil Engineering and Architecture Department, São Paulo, Brazil, Av. Dr. Adolpho Pinto, 109, Zip code 01156-050, São Paulo - SP, Brazil |
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Abstract: | The purpose of this study is to investigate the thermal performance of cool colored acrylic paints containing infrared reflective pigments in comparison to conventional colored acrylic paints of similar colors (white, brown and yellow) applied on sheets of corrugated fiber cement roofing. Evaluated properties are: color according to ASTM D 2244-89, the UV/VIS/NIR reflectance according to ASTM E 903-96, and thermal performance by exposure to infrared radiation emitted from a lamp with the measurement of surface temperatures of the specimens with thermocouples connected to a data logging system.Results demonstrated that the cool colored paint formulations produced significantly higher NIR reflectance than conventional paints of similar colors, and that the surface temperatures were more than 10 °C lower than those of conventional paints when exposed to infrared radiation. The study shows that cool paints enhance thermal comfort inside buildings, which can reduce air conditioning costs. |
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Keywords: | Cool paints Non-white cool paints Complex inorganic colored pigments (CICP) Solar reflectance Fiber cement roofing sheets Infrared reflective pigments Thermal comfort |
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