Designing hierarchical structures for innovative cooling textile

The potential of personal cooling technologies in reducing air conditioning energy consumption and enhancing human thermal comfort is substantial.This review focuses on recent advancements in hierarchical structure design for innovative cooling textiles.Beginning with insights into fundamental heat transfer processes between the human body,textile,and the surroundings,we uncover key control mechanisms.Then the advanced hierarchical structure designs enabling effective radiation,sweat evaporation,conduction management,and integration of cold energy sources for realizing effective human body cooling are systematically summarized.Additionally,we explore multifunctional designs beyond cooling,including switchable cooling-heating and sensing.Finally,we engage in discussions on unifying cooling performance tests and additional multiple requirements to make strides toward practical applications.This review is anticipated to be a valuable resource,providing the scientific and industrial communities with a quick grasp of past advancements,current challenges,and future directions in achieving effective human body cooling.

一种基于辐射制冷和太阳能制热的温度自适应双层薄膜

传统的制冷、制热技术能源消耗量巨大,而利用太空和太阳作为天然冷源和热源的辐射制冷和太阳能制热技术由于零能耗、低碳排的特点受到了研究者们的广泛关注,然而,目前被动式制冷/制热器件通常只能实现单一功能、无法满足动态环境条件下多变的制冷/制热需求,本文提出了一种温度自适应的智能控温双层薄膜(STG),以辐射制冷技术和太阳能制热技术为基础,可以随温度响应实现不同环境条件下制冷/制热模式的智能切换,当温度低于其境界温度时,STG膜在太阳光波段从高反射切换为高吸收(反射率由0.962变为0.059),而中红外发射率始终保持在0.95.该光谱特性使得STG膜在夏季直射阳光(辐射峰值>900Wm)下能够实现比环境温度低5°C的亚环境日间辐射冷却,而在冬季则能实现550Wm²的太阳光加热功率。作者同时通过理论模拟验证当STG膜被大规模应用时,这种可智能切换的制冷/制热装置在节能方面展现出了巨大的应用潜力该设计策略能够为零能耗的热响应控温器件提供新的思路,并为实现能源的可持续发展提供新的途径。