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首页> 外文期刊>International journal of low carbon technologies >Improving the performance of thermochromic coatings with the use of UV and optical filters tested under accelerated aging conditions
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Improving the performance of thermochromic coatings with the use of UV and optical filters tested under accelerated aging conditions

机译：通过在加速老化条件下测试的紫外线和光学滤光片，改善热致变色涂料的性能

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The role of the materials used in the urban fabric is highly important for the microclimate and the energy loads of the cities. This has led to the research and development of innovative solutions with advanced thermal and optical properties. Thermochromic coatings that are reflective in summertime and absorptive in wintertime can address the demand for lower surface temperatures and energy savings. The function, however, of thermochromic materials in outdoor spaces is complex as they degrade when interacting with solar radiation. Various techniques with UV absorbers and UV filters prove that ultraviolet radiation is not the only parameter that affects thermochromism. This study aims to go one step forward and investigate the factors that destroy the reversible thermochromic circle besides UV radiation. Combinations of UV and optical filters were used on thermochromic coatings applied on concrete tiles under accelerated aging conditions of a one-month period to isolate the parts of solar spectrum that cause the photodegradation. The measurements of reflectance and color prove that the use of UV filter did not improve significantly the dark phase of thermochromic effect, while at the white phase, SR was reduced by 5% and SRvis was reduced by 9.7% compared with the uncovered sample. Covering the sample with red filter, which cuts off wavelengths below 600nm, protects most efficiently the reversible color change of the thermochromic coating as the solar reflectance at the dark phase remains unaffected during the whole experimental period.
机译：用于城市结构的材料的作用对于微气候和城市的能源负荷非常重要。这导致了具有先进热学和光学特性的创新解决方案的研究和开发。在夏季具有反射性而在冬季具有吸收性的热致变色涂料可以满足降低表面温度和节约能源的需求。然而，由于室外热变色材料在与太阳辐射相互作用时会降解，因此其功能十分复杂。使用紫外线吸收剂和紫外线滤光片的各种技术证明，紫外线不是影响热致变色的唯一参数。这项研究旨在向前迈进，研究除紫外线辐射之外破坏可逆热致变色圆的因素。在一个月的加速老化条件下，将紫外线滤光片和光学滤光片的组合用于混凝土瓦上的热致变色涂料中，以隔离引起光降解的太阳光谱部分。反射率和颜色的测量结果表明，与未覆盖的样品相比，使用UV滤光片不会显着改善热致变色效果的暗相，而在白相时，SR降低了5％，SRvis降低了9.7％。用红色滤光片覆盖样品，该滤光片可切断低于600nm的波长，可最有效地保护热致变色涂层的可逆颜色变化，因为在整个实验期间，暗阶段的太阳反射率均不受影响。

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