Laminated Glazing Infrared Reflection Selectivity
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Solution Overview
Problem
Existing laminated glazing technologies face challenges in achieving high selectivity, reducing solar heat gain, and maintaining aesthetic appeal while avoiding the need for thermal tempering, which can lead to breakage due to overheating.
Innovation Solution
A laminated glazing system comprising a non-selective glass substrate with a high infrared reflection coefficient and an infrared reflecting layer that allows for improved selectivity, reduced solar factor, and varied aesthetics without the risk of thermal breakage, achieved by optimizing the glass composition and coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If colored glass is used to reduce solar energy transmission, then infrared radiation transmission is reduced and selectivity is improved, but the glass absorbs twice as much infrared radiation and heats up dangerously
Solution Approach 1:
The invention divides the solar control function into two separate components: a colored glass substrate that provides aesthetic appearance and partial solar control, and a separate infrared-reflecting coating applied to the outer surface that handles the primary infrared reflection. This segmentation allows each component to perform its specific function optimally without the colored glass overheating, as the infrared-reflecting coating reflects infrared radiation before it can be absorbed by the glass.
Solution Approach 2:
The infrared-reflecting coating acts as an intermediary layer between the incoming solar radiation and the colored glass substrate. It reflects infrared radiation outward before the colored glass can absorb it, thereby preventing the glass from heating up dangerously while still maintaining the desired solar control and aesthetic properties.
2Loss of energy
If multilayer solar control coatings are used to improve selectivity, then infrared reflection is increased, but the aesthetic appearance and color stability deteriorate
Solution Approach 1:
The invention separates the solar control function from the aesthetic function by applying a specialized infrared-reflecting coating to the outer surface of the colored glass, rather than using multilayer coatings that compromise appearance. This allows the colored glass to maintain its aesthetic properties while the coating provides the infrared reflection.
Solution Approach 2:
The invention changes the approach to infrared reflection by using a coating with specific optical properties (high infrared reflectivity) that does not interfere with the visible light transmission and color appearance of the colored glass. This parameter change allows simultaneous achievement of high selectivity and pleasing aesthetic appearance.
3Loss of energy
If the glass absorbs infrared radiation to reduce transmission, then selectivity is improved, but the glass heats up and may shatter
Solution Approach 1:
The infrared-reflecting coating serves as an intermediary that reflects infrared radiation before it can be absorbed by the glass substrate. This prevents the glass from absorbing excessive infrared energy and heating up to dangerous temperatures that could cause thermal breakage, thereby improving reliability.
Solution Approach 2:
Instead of allowing the glass to absorb infrared radiation (which causes heating and potential breakage), the invention uses an infrared-reflecting coating to convert the harmful infrared energy into reflected radiation, turning a potentially harmful effect into a beneficial solar control mechanism.
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 provides high selectivity, reduced heat gain, and a less reflective appearance while ensuring safety by minimizing the risk of thermal breakage, maintaining aesthetic appeal, and allowing for correction of color reflection without impacting selectivity.
Implementation Method 1
coated with an infrared-reflecting layer
Implementation Method 2
infrared radiation, which is responsible for interior heating
Implementation Method 3
colored glazing reduces the transmission of infrared radiation, which is responsible for interior heating (as this radiation is primarily absorbed by the glass)
Data Source
AI summary
The invention relates to laminated glazing comprising a substrate, in particular a transparent substrate, optionally coloured, coated with an infrared-reflecting layer and capable of being used as glazing in buildings or in vehicles. The coated substrate is made up of the combination of a glass substrate in which the composition has a redox of less than 15 %, characterised by infrared reflection RIRV so that RIRV ≥ 1.087 * TLV, wherein TLV is the light transmission of the glass, and an infrared reflecting layer characterised by light transmission TLC so that TLC ≥ 1.3 * TIRC, wherein TIRC is the infrared transmission of the layer.