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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Treated Aluminum as Highly Reflective Facade Materials for Energy-Efficient Buildings

Get access (open in a dialog) DOI: 10.1615/IHTC15.eef.008843
pages 2105-2118

Resumo

The use of highly reflective materials as building facade components can change the solar energy gain factor of the building envelope; therefore, they are important for energy-efficient buildings, particularly in climates that demand cooling. The intrinsic reflectivity of aluminum can be relatively high; however, the application of these materials as facade components is rather limited owing to their monotonous appearance. In this work, we discuss the potential use of treated aluminum as a building facade material by evaluating its optical properties. The measurements showed that the dried-on highly reflective coating system on a steel sheet always produced the highest reflectivity of all samples; nevertheless, this system is not normally applied to aluminum alloys in Japan. Regarding treated aluminum, whereas aluminum alloy is generally painted by baked-on coatings in Japan, the reflectivity of electrolytically colored anodized aluminum featured the second highest reflectivity; that for light colors was nearly the same as that of the highest reflectivity. The reflectivity of highly reflective baked-on coating on the aluminum alloy was larger than that of the conventional baked-on coating. In addition, the inorganic coating is expected to show satisfactory stability as well as variations in color. It may be concluded that electrolytically colored anodized aluminum shows promising potential as a highly reflective facade material to regulate the thermal performance of building envelopes.