Scalable Photochromic Film for Solar Heat and Daylight Management

Journal article (2024)

Authors

Weihao Meng University of Chinese Academy of Sciences
A.J.J. Kragt Architectural Technology - Architecture and the Built Environment , ClimAd Technology B.V.
Yingtao Gao University of Chinese Academy of Sciences
E. Brembilla Environmental & Climate Design - Architecture and the Built Environment
Julia S. van der Burgt ClimAd Technology B.V.
Albertus P.H.J. Schenning Eindhoven University of Technology
T. Klein Architectural Technology - Architecture and the Built Environment
E.R. van den Ham Environmental & Climate Design - Architecture and the Built Environment
Jingxia Wang University of Chinese Academy of Sciences
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Research Group
Architectural Technology (Architecture and the Built Environment) (TU Delft)
Copyright: © 2024 Weihao Meng, A.J.J. Kragt, Yingtao Gao, E. Brembilla, Julia S. van der Burgt, Albertus P.H.J. Schenning, T. Klein, E.R. van den Ham, Jingxia Wang, More Authors
DOI
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https://doi.org/10.1002/adma.202304910
Scalability Energy saving Transparency Smart windows Tungsten trioxide Daylight comfort Photochromicity
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Published Date

2024

Language

English

Reuse Rights

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Faculty

Architecture and the Built Environment

Department

Architectural Engineering +Technology

Research Group

Architectural Technology

Abstract

The adaptive control of sunlight through photochromic smart windows could have a huge impact on the energy efficiency and daylight comfort in buildings. However, the fabrication of inorganic nanoparticle and polymer composite photochromic films with a high contrast ratio and high transparency/low haze remains a challenge. Here, a solution method is presented for the in situ growth of copper-doped tungsten trioxide nanoparticles in polymethyl methacrylate, which allows a low-cost preparation of photochromic films with a high luminous transparency (luminous transmittance Tlum = 91%) and scalability (30 × 350 cm2). High modulation of visible light (ΔTlum = 73%) and solar heat (modulation of solar transmittance ΔTsol = 73%, modulation of solar heat gain coefficient ΔSHGC = 0.5) of the film improves the indoor daylight comfort and energy efficiency. Simulation results show that low-e windows with the photochromic film applied can greatly enhance the energy efficiency and daylight comfort. This photochromic film presents an attractive strategy for achieving more energy-efficient buildings and carbon neutrality to combat global climate change.