Radiative cooling glazing unit for mobility and mobility including the same

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing radiative cooling materials face challenges such as high absorptivity for sunlight, poor durability due to UV and moisture sensitivity, and insufficient radiative cooling performance, particularly in UV and near-infrared regions.

Innovation Solution

A radiative cooling glazing unit for mobility, comprising a first transparent base layer, a first light reflecting layer with high reflectance for near-infrared light, a second light reflecting layer with a stack of metal protective layers and a metal layer, and a second transparent base layer, which together provide excellent reflectance in UV and near-infrared regions and efficient long-wavelength infrared radiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If polymer material is used for radiative cooling, then infrared emissivity is high, but durability is poor due to UV and moisture sensitivity

Engineering Contradiction:

Improveinfrared emissivityVSAvoiddurability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent uses a composite structure consisting of a polymer base layer combined with inorganic reflective layers (metal or ceramic). This composite approach allows the polymer to provide high infrared emissivity while the inorganic layers protect against UV degradation and moisture, thereby maintaining both cooling performance and durability over time.

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If metal reflective layer is used, then infrared reflectance is high, but long-term stability is poor due to oxidation

Engineering Contradiction:

Improveinfrared reflectanceVSAvoidlong-term stability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent protects the metal reflective layer by placing it between the polymer base layer and the external environment. The polymer layer acts as a protective cushion that prevents direct exposure to oxygen and moisture, thereby preventing oxidation of the metal layer while maintaining its infrared reflective properties over the long term.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Loss of energy

If metal material is used for regular reflection, then reflectance is high, but eye fatigue and light blur are caused

Engineering Contradiction:

ImprovereflectanceVSAvoideye fatigue and light blur

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The patent differentiates the optical function by wavelength: the metal layer provides high reflectance for infrared radiation (non-visible), while the polymer base layer maintains high transmittance for visible light. This separation ensures that visible light passes through clearly without causing eye fatigue, while infrared radiation is effectively reflected for cooling purposes.

Inventive Principle:

Principle #3Local quality

4Illumination intensity

If paint containing white pigment is used, then visible light reflectance is improved, but infrared emissivity and ultraviolet reflectance are insufficient

Engineering Contradiction:

Improvevisible light reflectanceVSAvoidinfrared emissivity and ultraviolet reflectance

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent combines multiple functional materials to achieve comprehensive spectral control: the polymer base layer provides high infrared emissivity and UV resistance, the metal or ceramic reflective layers enhance infrared and UV reflection, and the white pigment in the polymer contributes to visible light reflectance. This composite structure achieves superior performance across all wavelength regions compared to white paint alone.

Inventive Principle:

Principle #40Composite 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 solution achieves excellent radiative cooling performance, durability, and resistance to sunlight, making it suitable for outdoor applications such as mobility exteriors, while maintaining high visible light transmittance and preventing eye fatigue.

Implementation Method 1

a first light reflecting layer formed on the first transparent base layer and having a reflectance of 80% or greater for light with a wavelength of 780 to 1,300 nm

Methodology Applied

Scientific EffectNear-infrared light reflection: Reflection

Implementation Method 2

a second light reflecting layer formed on the first light reflecting layer and including a stack of a first metal protective layer, a metal layer, and a second metal protective layer

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 3

has excellent long-wavelength infrared-ray radiation, resulting in an excellent radiative cooling effect

Methodology Applied

Scientific EffectInfrared radiation: Infrared Radiation

Data Source

PatentUS20250189709A1Radiative cooling glazing unit for mobility and mobility including the same

Publication Date: 2025.06.12 HYUNDAI MOTOR CO LTD

AI summary

An embodiment radiative cooling glazing unit includes a first transparent base layer, a first light reflecting layer on the first transparent base layer and having a reflectance of 80% or greater for light with a wavelength of 780 to 1,300 nm and a transmittance of 70% or greater for visible light with a wavelength of 400 to 780 nm, a second light reflecting layer on the first light reflecting layer and including a stack of a first metal protective layer, a metal layer, and a second metal protective layer sequentially stacked on the first light reflecting layer, and a second transparent base layer on the second light reflecting layer.