Structural Modeling and Performance Optimization of Metal-based Radiative Cooling Composites

This article proposes a multi-layer structure of "substrate+auxiliary layer+PDMS+anti reflection layer", which utilizes the synergy of transmission matrix method and genetic algorithm to optimize material composition and thickness. The optimal configuration is "TiO ₂ (1.2 μ m)+PDMS (15 μ m)+MgF ₂ (0.11 μ m)", achieving a net cooling power of 98.6 W/m ², a visible light transmittance of 87.3%, and an atmospheric window emissivity of 92.1%. This study established a three-dimensional optimization model that integrates performance, cost, and feasibility. A five layer composite film structure is formed by adding a SiO ₂ protective layer and an aluminum foil substrate. This design achieved a net cooling power of 92.3 W/m ², with a unit area cost of 128 yuan/㎡ and a feasibility score of 0.85. The investment payback period is only 2.8 years, indicating enormous potential for industrialization. This study proposes a design of a radiation cooling film based on PDMS through multi-level modeling and system optimization. The film has high cooling performance, low manufacturing cost, and strong engineering feasibility, providing theoretical basis and design reference for the practical application and promotion of PDRC technology.