Radiative Cooling Device with Colored Resin Layer
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Solution Overview
Problem
Conventional radiative cooling devices are costly to produce and do not appear colored, which is desirable for integration into roofs of houses or automobiles to match surrounding colors, while maintaining effective cooling performance.
Innovation Solution
A radiative cooling device comprising an infrared radiative layer made of resin material with a thickness optimized for emitting heat radiation greater than absorbed solar energy in the 8 μm to 14 μm range, combined with a light reflective layer and a color portion containing a colorant that absorbs visible light, allowing the device to appear colored and efficiently cool surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light reflective layer with high reflectance in the visible range is used to maintain cooling performance, then the device appears as a mirror surface without color, but the aesthetic requirement for colored appearance is not met
Solution Approach 1:
The patent applies different optical properties to different wavelength ranges: the light reflective layer has high reflectance in the visible range (400-800 nm) to maintain cooling performance, while the color layer selectively absorbs specific visible wavelengths to provide color. This local differentiation of optical properties resolves the contradiction between maintaining mirror-like cooling performance and achieving colored aesthetic appearance.
Solution Approach 2:
The patent combines multiple layers with different functions: a light reflective layer for high visible reflectance, a color layer with selective light absorption for aesthetic appearance, and an infrared radiative layer for thermal management. This composite structure integrates the benefits of each layer to simultaneously achieve cooling performance and colored appearance.
2Reliability
If conventional light reflective layers are used to achieve high reflectance, then cooling performance is maintained, but production cost increases
Solution Approach 1:
The patent replaces expensive conventional light reflective layers (such as multilayer dielectric mirrors or metal coatings) with a cost-effective color layer containing organic or inorganic pigments that provide both color and sufficient light reflection. This substitution significantly reduces production cost while maintaining adequate cooling performance.
Solution Approach 2:
The patent optimizes the thickness and composition parameters of the color layer to achieve the right balance between light absorption (for color) and light reflection (for cooling). By carefully controlling these parameters, the device maintains cooling performance while using cheaper materials compared to conventional high-reflectance coatings.
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 device achieves a cooling function under solar radiation while appearing colored, thus matching surrounding aesthetics at a lower production cost, with the colorant content optimized to minimize heat absorption and maximize radiative cooling performance.
Implementation Method 1
radiates infrared light from a radiative surface and allows infrared light radiated from the radiative surface of the infrared radiative layer to be transmitted through an atmospheric window
Implementation Method 2
the light reflective layer reflects light (visible light, ultraviolet light, infrared light) transmitted through the infrared radiative layer
Implementation Method 3
the color portion contains a colorant that absorbs light in the visible range
Implementation Method 4
the infrared radiative layer is a resin material layer that has a thickness adjusted so as to emit a heat radiation energy greater than an absorbed solar energy in a wavelength range from 8 μm to 14 μm
Data Source
AI summary
A radiative cooling device that is in a state in which a radiative surface is colored is provided. A radiative cooling device CP includes an infrared radiative layer A that radiates infrared light IR from a radiative surface H, a light reflective layer B that is disposed on the side opposite to the radiative surface H with respect to the infrared radiative layer A, and a color portion X. The infrared radiative layer A is a resin material layer J that has a thickness adjusted so as to emit a heat radiation energy greater than an absorbed solar energy in a wavelength range from 8 μm to 14 μm, and the color portion X contains a colorant that absorbs light in the visible range.