用于高效光伏热管理的水泥基复合材料增强被动辐射冷却

Abstract Thermal management remains a critical challenge in building-integrated photovoltaics (BIPV), where elevated operating temperatures significantly impair power conversion efficiency. This study comprehensively investigates cementitious composites incorporating single-component ( α -Al 2 O 3 , BaSO 4 , or CaCO 3 ) and dual-component passive daytime radiative cooling (PDRC) particles at 30 % and 60 % replacement ratios. Material characterization and performance analysis reveal that the dual-component system containing α -Al 2 O 3 and BaSO 4 both at 30 % replacement of cement achieves the optimal passive cooling performance, with solar reflectance of 94.54 % and mid-infrared emissivity of 96.41 %. When integrated with PV panels, this composite reduces operating temperatures by 16.54 K and enhances photovoltaic conversion efficiency by 7.87 %. Numerical simulations and finite element analysis validate the system’s performance under various environmental conditions, while maintaining mechanical properties suitable for building applications. This work demonstrates a promising pathway for integrating radiative cooling into BIPV systems through multi-functional building materials, addressing both thermal management and structural requirements without external energy input.