Radiative-cooling block fabricated by recycled textiles
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초록
내용
Each year more than 90 million tons of textile trash is made all over the world, and active cooling is one of the most energy consuming process, however, indispensable in summer for one’s thermal comfort.Herein, we have developed radiative-cooling blocks made of recycled textiles, which can resolve these two major problems.Radiative-cooling blocks have a unique wavelength-selective optical properties having high solar energy reflection as well as high thermal radiative emission in order to save heating, ventilation and air conditioning (HVAC) energy consumption. Blocks were made by pressing pulverized fibers at 27 MPa and 200 °C for 1hr. Blocks composed of ~10 μm polyester fiber have ~90% near-infrared radiation (NIR) (900-2500 nm wavelength) reflection owing to Mie scattering from bunch of stacked fibers, and ~80% infrared radiation (IR) emissivity from IR absorption property of polyester..These blocks are applicable in various fields where needs sustainability and carbon neutrality, to be specific, such as for construction materials.