Recent developments on solar reflective glazed ceramic tiles

Reference Presenter Authors
11-003 Chiara Ferrari Ferrari, C.(Department of Engineering "Enzo Ferrari"); Muscio, A.(Department of Engineering "Enzo Ferrari"); Siligardi, C.(Department of Engineering "Enzo Ferrari"); Nowadays the urban heat island, the overheating of urban areas with respect to the surrounding areas due to strong absorption of solar radiation, is one of the most relevant phenomenon to be countered in connection with climate change. In order to mitigate such phenomenon, which is dangerous for both building energy needs and people's health, one of the most effective solutions is the use of solar reflective materials, also known as cool materials. These are characterized by enhanced capability to reflect solar radiation in the shortwave part of the thermal radiation spectrum, from 300 to 2500 nm, and to re-emit the absorbed energy in the longwave part, from 4000 to 40000 nm. Solar reflectance, the ratio of reflected and incident shortwave solar radiation, is related to the surface features (color, finishing, etc.), whereas thermal emittance, the ratio of emitted longwave infrared radiation and maximum theoretical emission at the same temperature, may be related to the bulk properties (metallic, ceramic, wooden, polymeric substrate, etc.). Among solar reflective materials, ceramic based ones recently raised an increasing interest due to their high durability against time and their easy maintenance, although the market is actually dominated by polymeric based ones. Several recent studies concerning both ceramic and clay tiles were therefore aimed to design new solar reflective products starting from engobe formulation up to glaze, pigments and potential decorations. This work is aimed to provide a comprehensive review of all recent findings in the field of solar reflective ceramic surfaces, analyzing not only the materials employed to produce cool tiles and how these evolved from the traditional tiles to current high-performance products. The characterization techniques most suitable to evaluate the material properties are also reviewed. A final section is dedicated to investigation of durability under natural and artificial (laboratory) weathering conditions.
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