Coated Glass Solar Control via Layered Absorption and Reflection
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Solution Overview
Problem
Achieving desired spectral properties in coated glass articles while combining specific energy absorption and light transmittance properties is challenging, as adjustments to enhance one property often adversely impact others.
Innovation Solution
A coated glass article comprising a glass substrate with a first absorbing layer, a second low emissivity layer, and a third reflecting layer, where the refractive indices of the layers are specifically tailored to provide visible light reflectance greater than 15% and emissivity less than or equal to 0.3, using materials like antimony doped tin oxide, fluorine doped tin oxide, and titanium oxide, and optionally an iridescence-suppressing interlayer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the composition or thickness of coating layers is adjusted to enhance energy absorption, then energy absorption property is improved, but light transmittance and spectral properties are adversely impacted
Solution Approach 1:
The coating is divided into multiple functional layers: a first coating layer for energy absorption, a second coating layer for light reflection, and a third coating layer for spectral control. Each layer is optimized independently to perform its specific function, allowing energy absorption to be enhanced without compromising light transmittance and spectral properties, as the other layers compensate for the trade-offs
Solution Approach 2:
The patent uses composite coating structures combining different materials with complementary properties: antimony-doped tin oxide for absorption, zinc oxide for reflection, and fluorine-doped tin oxide for spectral control. This composite approach allows simultaneous optimization of energy absorption, light transmittance, and spectral properties that cannot be achieved with single-material coatings
2Illumination intensity
If the composition or thickness of coating layers is adjusted to enhance light transmittance, then light transmittance property is improved, but energy absorption and spectral properties are adversely impacted
Solution Approach 1:
The coating is divided into multiple functional layers: a first coating layer for energy absorption, a second coating layer for light reflection, and a third coating layer for spectral control. Each layer is optimized independently to perform its specific function, allowing light transmittance to be enhanced without compromising energy absorption and spectral properties, as the other layers compensate for the trade-offs
Solution Approach 2:
The patent uses composite coating structures combining different materials with complementary properties: antimony-doped tin oxide for absorption, zinc oxide for reflection, and fluorine-doped tin oxide for spectral control. This composite approach allows simultaneous optimization of light transmittance, energy absorption, and spectral properties that cannot be achieved with single-material coatings
3Reliability
If adjustments are made to obtain desired spectral properties, then spectral properties are improved, but energy absorption and light transmittance properties are adversely impacted
Solution Approach 1:
The coating is divided into multiple functional layers: a first coating layer for energy absorption, a second coating layer for light reflection, and a third coating layer for spectral control. Each layer is optimized independently to perform its specific function, allowing spectral properties to be enhanced without compromising energy absorption and light transmittance, as the other layers compensate for the trade-offs
Solution Approach 2:
The patent uses composite coating structures combining different materials with complementary properties: antimony-doped tin oxide for absorption, zinc oxide for reflection, and fluorine-doped tin oxide for spectral control. This composite approach allows simultaneous optimization of spectral properties, energy absorption, and light transmittance that cannot be achieved with single-material 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 solution results in a visible light reflecting, solar control glazing with low emittance, solar heat gain coefficient, and shading coefficient, improving energy efficiency and providing a neutral color for film side reflection, thereby reducing indirect heat gain and energy costs.
Implementation Method 1
a first coating deposited over the glass substrate, the first coating comprising an absorbing layer
Implementation Method 2
a second coating deposited over the first coating, the second coating comprising a low emissivity layer
Implementation Method 3
a third coating deposited over the second coating, the third coating comprising a reflecting layer
Data Source
AI summary
A coated glass article provides a visible light reflecting, solar control glazing with a low emittance, a low solar heat gain coefficient, and a low shading coefficient that can significantly improve energy costs in buildings and homes while providing a desirable neutral color for, at least, film side reflection. The low emittance characteristic of the 5 glazing would minimize any indirect heat gain from absorption.