Kim Beom-Su, Kim Jae-Hyun, Kang Gumin, Ko Hyungduk, Gan Qiaoqiang, Kim Sun-Kyung
Department of Applied Physics, Kyung Hee University, Yongin-si, Gyeonggi-do 17104, Republic of Korea.
Nanophotonics Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea.
iScience. 2025 Apr 24;28(5):112514. doi: 10.1016/j.isci.2025.112514. eCollection 2025 May 16.
Adaptive thermal regulation is crucial for year-round energy savings in buildings, especially in mid-latitude regions. Here, leveraging the seasonally varying angles of direct sunlight, we report a microprism-array sheet that enables seasonal energy saving windows. Guided by geometric optics, the asymmetric microprism-array sheet, featuring a silver coating on the sky-facing facets, exhibited an average transmittance of 10% in summer and 53% in winter at predominant sunlight angles, compared to 30% and 38% of a standard tint film, respectively. During outdoor testing in South Korea (37°N), a south-facing window integrated with the microprism-array sheet reduced floor temperatures by up to 5°C during direct sunlight hours, relative to a tinted window. Notably, in east-facing windows, the microprism-array sheet transitioned from heating to cooling around 9:00 a.m., highlighting its potential for modulating seasonal thermal management.
自适应热调节对于建筑物全年节能至关重要，特别是在中纬度地区。在此，利用直射阳光随季节变化的角度，我们报道了一种微棱镜阵列薄片，它能实现季节性节能窗户。在几何光学的指导下，这种不对称微棱镜阵列薄片在面向天空的面上有银色涂层，在主要阳光角度下，夏季平均透过率为10%，冬季为53%，而标准贴膜的这一数值分别为30%和38%。在韩国（北纬37°）进行的户外测试中，与微棱镜阵列薄片集成的朝南窗户在直射阳光时段使地板温度降低了多达5°C，相对于有色窗户而言。值得注意的是，在朝东的窗户中，微棱镜阵列薄片在上午9点左右从加热转变为冷却，突出了其在调节季节性热管理方面的潜力。
