概括
这项研究引入了一种新的Janus窗口,可以传输可见光,同时选择性地阻断近红外 (NIR) 辐射. 这种创新的光谱选择性窗口提供可切换的被动冷却和太阳能供暖,以提高建筑的能源效率.
科学领域:
- 材料科学 材料科学 材料科学
- 建筑物理 建筑物理
- 能源效率 能源效率 能源效率
背景情况:
- 传统的光谱选择性窗户使用纳米粒子来分离可见和近红外 (NIR) 辐射,以提高夏季的能源效率.
- 现有的光热窗户难以有效地阻断NIR能量,导致室内加热和冷却负载增加.
- 这些窗户还阻碍了冬季太阳能热量的增加,导致额外的供暖能耗.
研究的目的:
- 为可见光传输和可切换的被动冷却和太阳能供暖提出一个Janus窗口.
- 为了分离可见光和NIR辐射,以优化建筑热管理.
- 通过具有可调节发射率的不对称结构来调节室内热增益.
主要方法:
- 一个具有特定可见透射率 (57.8%) 和NIR透射率 (8.1%) 的Janus窗口的制造.
- 在8-14微米大气窗口内,加入一个具有可调节发射率 (32.5%-80.4%) 的不对称结构.
- 在冷却和加热模式下评估热性能,包括温度调节和太阳能热吸收.
主要成果:
- 简斯窗实现了可见光和近红外辐射的有效分离.
- 在冷却模式下,与双面玻璃相比,它可以将室内温度降低9°C.
- 窗户旋转通过调整辐射散热和太阳能吸热层,使温度相对于冷却模式上升4°C.
结论:
- "雅努斯窗口"提出了一项新的战略,旨在提高建筑物的能效.
- 它提供了一个可调节的方法来管理室内热收益,在冷却和加热之间切换.
- 这项技术有可能在建筑窗户,太阳能电池和温室应用中取得进展.
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