Annual Energy‐Saving Smart Windows with Actively Controllable Passive Radiative Cooling and Multimode Heating Regulation

• DOI: 10.1002/adma.202401869
• Publication Date: 2024-04-19T23:59:36Z
• Authors: Yuan Deng; Yihai Yang; Yuanhang Xiao; Xingping Zeng; He‐Lou Xie; Ruochen Lan; Lanying Zhang; Huai Yang
• Keywords: Radiative Cooling; Carbon Footprint

Abstract Smart windows with radiative heat management capability using the sun and outer space as zero‐energy thermodynamic resources have gained prominence, demonstrating a minimum carbon footprint. However, realizing on‐demand thermal throughout all seasons while reducing fossil energy consumption remains formidable challenge. Herein, an energy‐efficient smart window that enables actively tunable passive cooling (PRC) multimode heating regulation is demonstrated by integrating emission‐enhanced polymer‐dispersed liquid crystal (SiO 2 @PRC PDLC) film low‐emission layer deposited nanotubes. Specifically, this device can achieve temperature close to chamber interior ambient under solar irradiance of 700 W m −2 , well drop 2.3 °C at sunlight 500 whose multistage PRC efficiency be rapidly adjusted moderate voltage. Meanwhile, synchronous cooperation (PRH), (SH), electric (EH) endows handle complicated situations during cold weather. Energy simulation reveals substantial superiority in savings compared single‐layer SiO PDLC, normal glass, commercial low‐E glass when applied different climate zones. This work provides feasible pathway for year‐round management, presenting huge potential energy‐saving applications.