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Title: 3D printed smart windows for adaptive solar modulations
Authors: Zhou, Chengzhi
Li, Dan
Tan, Yutong
Ke, Yujie
Wang, Shancheng
Zhou, Yang
Liu, Guowei
Wu, Shaofan
Peng, Jinqing
Li, Anran
Li, Shuzhou
Chan, Siew Hua
Magdassi, Shlomo
Long, Yi
Keywords: Engineering::Materials
Issue Date: 2020
Source: Zhou, C., Li, D., Tan, Y., Ke, Y., Wang, S., Zhou, Y., . . . Long, Y. (2020). 3D printed smart windows for adaptive solar modulations. Advanced Optical Materials, 8(11), 2000013-. doi:10.1002/adom.202000013
Journal: Advanced Optical Materials 
Abstract: Vanadium dioxide (VO2) based thermochromic smart window is considered as the most promising approach for economizing building energy consumption. However, the high phase transition temperature (τc), low luminous transmission (Tlum), and solar modulation (ΔTsol) impose an invertible challenge for commercialization. Currently, smart window research surprisingly assumes that the sunlight radiates in one direction which is obviously not valid as most regions receive solar radiation at various angles in different seasons. For the first time, solar elevation angle is considered and 3D printing technology is employed to fabricate tilted microstructures for modulating solar transmission dynamically. To maximize energy-saving performance, the architecture of the structures (tilt, thickness, spacing, and width) and tungsten (W) doped VO2 can be custom-designed according to the solar elevation angle variation at the midday between seasons and tackle the issue of compromised Tlum and ΔTsol with W-doping. The energy consumption simulations in different cities prove the efficiency of such dynamic modulation. This first attempt to adaptively regulate the solar modulation by considering the solar elevation angle together with one of the best reported thermochromic properties (τc = 40 °C, Tlum(average) = 40.8%, ΔTsol = 23.3%) may open a new era of real-world-scenario smart window research.
ISSN: 2195-1071
DOI: 10.1002/adom.202000013
Rights: This is the peer reviewed version of the following article: Zhou, C., Li, D., Tan, Y., Ke, Y., Wang, S., Zhou, Y., . . . Long, Y. (2020). 3D printed smart windows for adaptive solar modulations. Advanced Optical Materials, xxx, 2000013-, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
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