Composite Materials with Tailored Particle Mixes for Thermal Management
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Solution Overview
Problem
Conventional materials used in buildings absorb significant solar radiation, leading to increased indoor temperatures and higher energy costs for cooling, particularly in regions with high solar radiation, and fail to effectively manage thermal energy across various electromagnetic spectra.
Innovation Solution
A composite material is created using a tailored mixture of nano- and micro-particles with distinct size, shape, chemical, and crystallinity distributions embedded in a carrier material, optimized to achieve specific broadband spectral reflectance in the visible and Near-Infrared ranges, reducing solar radiation absorption and enhancing thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional materials are used in buildings, then the building structure is simple and easy to manufacture, but the materials absorb significant solar radiation leading to increased indoor temperatures and higher energy consumption for cooling
Solution Approach 1:
The patent applies composite materials by combining multiple types of particles (e.g., TiO2, SiO2, ZnO) with specific size distributions (bimodal, trimodal, or broader distributions) embedded in a carrier material. This composite structure enables tailored broadband spectral reflectance across UV, visible, and NIR ranges, significantly reducing solar radiation absorption while managing thermal energy effectively, thereby resolving the contradiction between energy loss reduction and material structure complexity.
Solution Approach 2:
The patent implements local quality by using particles with distinct size distributions where different size ranges serve specific functions: smaller particles (e.g., 0.1-1 μm) target UV and visible light scattering, while larger particles (e.g., 1-10 μm) address NIR reflection. This localized functional differentiation within the composite material enables optimized spectral control across different wavelength ranges, reducing overall solar heat gain while maintaining manageable material complexity.
2Loss of energy
If materials with high solar radiation reflection are used, then energy consumption is reduced, but the visual appearance and aesthetic properties may be compromised
Solution Approach 1:
The patent applies local quality by assigning different particle size ranges to different spectral functions: smaller particles (0.1-1 μm) primarily scatter UV and visible light to maintain desired visual appearance and color, while larger particles (1-10 μm) reflect NIR radiation to reduce solar heat absorption. This spatial and functional differentiation allows the material to simultaneously achieve aesthetic visual properties and high solar radiation reflection, resolving the contradiction between energy efficiency and visual appeal.
Solution Approach 2:
The composite material combines multiple particle types (TiO2, SiO2, ZnO) with tailored size distributions to achieve broadband spectral control. The synergistic interaction between different particle sizes and materials enables the surface to reflect both visible light (maintaining visual appearance) and NIR radiation (reducing solar heat gain), thereby resolving the contradiction between energy loss reduction and illumination intensity preservation.
3Ease of manufacture
If single-scale particles are used in composite materials, then the manufacturing process is simpler, but the spectral control and thermal management performance is limited
Solution Approach 1:
The patent applies segmentation by dividing the particle population into multiple distinct size distributions (bimodal with two peaks, trimodal with three peaks, or broader distributions) rather than using uniform single-scale particles. Each size segment targets specific wavelength ranges: smaller segments for UV/visible and larger segments for NIR. This segmented approach enables precise spectral reflectance control across the full solar spectrum while maintaining relatively simple manufacturing through straightforward particle mixing and embedding in carrier materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite material significantly reduces solar radiation absorption, lowering indoor temperatures and energy consumption, while maintaining desired visual appearances, and can be applied to various structures to mitigate the heat island effect and enhance thermal performance.
Implementation Method 1
achieve specific targeted broadband spectral reflectance at least within the VIS and NIR range
Implementation Method 2
how readily visible and invisible electromagnetic radiation is absorbed from a surface and thus gets converted into thermal energy
Data Source
AI summary
Disclosed is a method to produce composite materials, which contain customized mixes of nano- and/or micro-particles with tailored electromagnetic spectral properties, structural elements based thereon, in particular layers, but also bulk materials including inhomogeneous bulk materials. In some embodiments the IR-reflectivity is enhanced predominantly independently of reflectivity for visible wavelength. The enhanced IR-reflectivity is achieved by combining spectral properties from a plurality of nano- and/or micro-particles of distinct size distribution, shape distribution, chemical composition, crystal structure, and crystallinity distribution. This enables to approximate desired target spectra better than know solutions, which comprise only a single type of particles and/or an uncontrolled natural size distribution. Furthermore disclosed are methods of manufacturing such materials, including ceramics, clay, and concrete, as well as applications related to design and construction of buildings or other confined spaces.