Thermal protection and comfort are essential for instruments and humans,especially in high-temperature scenarios such as fires and steelworks.Existing thermal protective windows absorb external radiation and heat when...Thermal protection and comfort are essential for instruments and humans,especially in high-temperature scenarios such as fires and steelworks.Existing thermal protective windows absorb external radiation and heat when exposed to thermal sources,thereby failing to provide thermal comfort to users.Herein,we present a nanophotonic-engineered thermal protective window(NETPW)strategy that incorporates a visible-light transparent broadband directional thermal emitter and a low-emissivity coating into commercial polycarbonate(PC)windows.In comparison to a PC window exposed to a 700 K thermal source at a half-view angle of 50°,the proposed NETPW exhibits remarkable temperature reduction(~77.7℃)by reflecting external radiation and enhancing directional radiative cooling.Simultaneously,the NETPW effectively inhibits heat emissions toward users,resulting in a significant improvement in thermal comfort,with a user’s sensible temperature reduction of 57℃.Moreover,the NETPW exhibits high visible transparency,high-temperature resistance,scratch resistance,and impact resistance.The seamless integration with existing windows provides a novel approach for controlling thermal emission and optimizing energy exchange.展开更多
基金supported by the National Natural Science Foundation of China(Grant Numbers U2341225 and 62375242)Sichuan Science and Technology Program(2025YFHZ0297).
文摘Thermal protection and comfort are essential for instruments and humans,especially in high-temperature scenarios such as fires and steelworks.Existing thermal protective windows absorb external radiation and heat when exposed to thermal sources,thereby failing to provide thermal comfort to users.Herein,we present a nanophotonic-engineered thermal protective window(NETPW)strategy that incorporates a visible-light transparent broadband directional thermal emitter and a low-emissivity coating into commercial polycarbonate(PC)windows.In comparison to a PC window exposed to a 700 K thermal source at a half-view angle of 50°,the proposed NETPW exhibits remarkable temperature reduction(~77.7℃)by reflecting external radiation and enhancing directional radiative cooling.Simultaneously,the NETPW effectively inhibits heat emissions toward users,resulting in a significant improvement in thermal comfort,with a user’s sensible temperature reduction of 57℃.Moreover,the NETPW exhibits high visible transparency,high-temperature resistance,scratch resistance,and impact resistance.The seamless integration with existing windows provides a novel approach for controlling thermal emission and optimizing energy exchange.
