Composite Radiative Cooling Material Layering

The patent applies composite materials by combining three distinct layers (reflective layer, porous layer, and emissive layer) into a single radiative cooling material system. Each layer contributes specific optical properties, and their combination achieves superior total solar reflectance (>85%) and thermal emissivity (>85%) that individual materials cannot achieve alone, directly resolving the contradiction between cooling effectiveness and optical performance reliability

The patent segments the radiative cooling material into three functional layers with distinct roles: the reflective layer (bottom) for solar radiation reflection, the porous layer (middle) for additional reflection and thermal management, and the emissive layer (top) for infrared emission. This segmentation allows optimization of each layer's specific function to collectively achieve the desired high reflectance and emissivity performance

The patent divides the radiative cooling system into three distinct functional layers, where each layer has a specific optical function. This segmentation enables independent optimization of each layer's properties while maintaining overall system performance, achieving high cooling effectiveness without excessive complexity

The porous layer serves multiple functions simultaneously: it provides additional solar radiation reflection, enables thermal management through its porosity, and acts as a structural bridge between the reflective and emissive layers. This multi-functionality reduces the need for additional specialized layers, thereby controlling device complexity while enhancing cooling performance