A High-Performance Radiative Cooling Glass Based on Multi-Band Selective Regulation for Synergistic Heat Dissipation and Resistance

Abstract

Visibly transparent radiative cooling (VTRC) glass offers a promising pathway for building energy efficiency by simultaneously blocking solar heat and dissipating indoor heat to outer space. However, conventional designs of vertically installed windows often focus on optimizing emission or reflection across the entire mid-infrared spectrum, neglecting the dual demand for outward radiative cooling and resistance to incoming thermal radiation from the surroundings. Herein, we proposed a strategy for the selective mid-infrared (MIR) regulation to overcome the above limitation and fabricated a multi-band selective regulation radiative cooling (MBSR-RC) glass through a simple blade-coating method. The fabricated MBSR-RC glass exhibited a precisely engineered spectrum. It maintained a high VIS transmission (85%), a high NIR blocking (72%), a high emission (87%) in the atmospheric transparent window for heat dissipation, and a high reflection (60%) in the remaining MIR region to resist environmental heat. Consequently, compared with conventional radiative cooling glass and Low-Emissivity (Low-E) glass under vertical installation, the multiband selective regulation radiative cooling (MBSR-RC) glass achieved a maximized temperature reduction of 4 ℃. Furthermore, it demonstrated high practicality with a high ultraviolet resistance, a low thermal conductivity, and a strong anti-raindrop stability. EnergyPlus simulation showed that, compared with normal buildings, an energy saving of 3.2 kWh/m 2 could be achieved in buildings employing the MBSR-RC. This work provides a novel and practical design for energy-saving windows, showcasing significant potential for energy-efficient building applications.