Radiative Cooling Device UV Reflection Layer
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Solution Overview
Problem
Conventional radiative cooling devices suffer from insufficient cooling performance due to the absorption of ultraviolet light by the infrared radiative layer and sunlight reflection layer, particularly exacerbated by surface plasmon resonance in multi-layered structures on metal surfaces.
Innovation Solution
A radiative cooling device is designed with an ultraviolet reflection layer, a light reflection layer, and an infrared radiative layer, where the ultraviolet reflection layer is formed by laminating two or more dielectrics with different refractive indices, and the layers are stacked in order to reflect ultraviolet light and prevent its absorption, while the infrared radiative layer is made of silicon dioxide for efficient heat radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an infrared radiative layer and sunlight reflection layer are formed directly on a metal surface in a multi-layered structure, then the device can reflect visible light and infrared light, but ultraviolet light absorption is amplified through surface plasmon resonance
Solution Approach 1:
The patent introduces an intermediate ultraviolet reflection layer between the metal surface and the infrared radiative layer/sunlight reflection layer. This segmentation separates the functions of ultraviolet reflection and infrared/visible light reflection, preventing surface plasmon resonance from occurring while maintaining the optical performance of each layer.
Solution Approach 2:
The ultraviolet reflection layer acts as an intermediary layer that mediates between the metal surface and the other functional layers. It reflects ultraviolet light before it can interact with the metal surface, thereby preventing surface plasmon resonance without interfering with the performance of the infrared radiative layer and sunlight reflection layer.
2Temperature
If the infrared radiative layer is positioned to radiate infrared light effectively, then cooling performance can be achieved, but ultraviolet light from sunlight may be absorbed by this layer
Solution Approach 1:
The patent segments the optical functions by introducing a dedicated ultraviolet reflection layer, allowing the infrared radiative layer to focus on infrared radiation without the harmful side effect of ultraviolet absorption. This segmentation enables each layer to perform its specific function optimally.
Solution Approach 2:
The ultraviolet reflection layer performs preliminary action by reflecting ultraviolet light before it can reach and be absorbed by the infrared radiative layer. This prevents the harmful effect of ultraviolet absorption while preserving the cooling function of the infrared radiative layer.
3Device complexity
If a conventional multi-layered structure is used with the infrared radiative layer on the sunlight reflection layer, then the device structure is compact, but sufficient cooling performance cannot be obtained due to ultraviolet absorption
Solution Approach 1:
The patent adds a segmented ultraviolet reflection layer to the existing multi-layered structure, creating a more refined layer configuration. This segmentation resolves the contradiction by enabling sufficient cooling performance through prevented ultraviolet absorption while maintaining reasonable structural compactness.
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
This configuration effectively suppresses ultraviolet light absorption, improving the cooling performance by reflecting incident light and radiating heat as infrared radiation, thereby enhancing the cooling efficiency.
Implementation Method 1
an ultraviolet reflection layer that reflects ultraviolet light
Implementation Method 2
a light reflection layer that reflects visible light and infrared light
Implementation Method 3
an infrared radiative layer that radiates infrared light
Implementation Method 4
radiative cooling refers to a phenomenon in which a temperature of a substance is reduced as the substance radiates (emits) an electromagnetic wave such as infrared radiation
Implementation Method 5
absorption of ultraviolet light may be amplified through surface plasmon resonance by this multi-layered structure
Data Source
AI summary
A radiative cooling device and a radiative cooling method that effectively suppress ultraviolet light absorption. The radiative cooling device includes an ultraviolet reflection layer that reflects ultraviolet light UV, a light reflection layer that reflects visible light and infrared light, and an infrared radiative layer that radiates infrared light IR. Infrared light IR is radiated form a radiative surface. The ultraviolet reflection layer, the infrared radiative layer and the light reflection layer are laminated in this order as viewed from the side of the radiative surface.