Solar Control Coating with Segmented Metal Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solar control coatings with one to three continuous infrared reflective metal layers are insufficient in reducing the solar heat gain coefficient (SHGC) while maintaining high transmittance and low visible light reflectance, and are prone to variations in thickness and durability issues.
Innovation Solution
A solar control coating with at least four metal functional layers, including a combination of continuous and subcritical metal layers, along with phase adjustment layers and primer layers, to optimize infrared reflection and visible light transmittance, achieving a lower SHGC and higher light to solar gain ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thicknesses of continuous infrared reflective metal layers are increased to decrease SHGC, then solar control performance is improved, but visible light reflectance increases and transmittance decreases
Solution Approach 1:
The patent divides the continuous metal layer into multiple discrete metal functional layers (at least four layers) separated by dielectric layers. This segmentation allows each metal layer to be thinner individually, reducing visible light reflectance while collectively providing enhanced infrared reflection to lower SHGC. The dielectric layers between metal layers further modulate optical properties through interference effects.
Solution Approach 2:
The patent transitions from a single-dimensional approach (one or two thick metal layers) to a multi-dimensional structure with at least four metal layers separated by dielectric layers. This multi-layer configuration adds complexity in the layering dimension, enabling independent optimization of infrared reflection and visible light transmission through careful selection of layer thicknesses and materials.
2Object-affected harmful factors
If the thicknesses of continuous infrared reflective metal layers are increased to decrease SHGC, then solar control performance is improved, but the coating becomes more sensitive to thickness variations
Solution Approach 1:
By segmenting the total metal content into at least four separate metal functional layers, the patent reduces the thickness of each individual layer. This makes each layer less sensitive to manufacturing variations while maintaining the cumulative infrared reflective effect. The distributed structure provides tolerance to thickness variations that would critically impact fewer, thicker layers.
Solution Approach 2:
The patent changes the structural parameters from few thick layers to many thin layers, fundamentally altering the sensitivity profile. The multi-layer configuration with dielectric spacers creates a structure where the overall optical performance is more robust to individual layer thickness variations, as the effects are distributed across multiple interfaces and layers.
3Object-affected harmful factors
If the thicknesses of continuous infrared reflective metal layers are increased to decrease SHGC, then solar control performance is improved, but chemical and mechanical durability decreases
Solution Approach 1:
The patent segments the metal content into at least four thinner metal functional layers separated by dielectric layers. This segmentation protects the metal layers from direct exposure to environmental contaminants and mechanical stress, as the dielectric layers act as protective barriers. The distributed thinner layers are inherently more durable than fewer thick layers that would be more vulnerable to degradation.
Solution Approach 2:
The dielectric layers serve as intermediary protective barriers between the metal functional layers and the external environment. These dielectric layers protect the metal layers from chemical attack and mechanical damage, enhancing overall coating durability while allowing the metal layers to maintain their infrared reflective function.
4Ease of manufacture
If conventional solar control coatings with one to three metal layers are used, then manufacturing is simpler, but solar control performance and aesthetic options are limited
Solution Approach 1:
The patent applies segmentation by using at least four metal functional layers instead of one to three layers. While this increases the number of deposition steps, each layer can be applied using standard sputtering or evaporation techniques. The segmented structure enables superior solar control performance through cumulative infrared reflection and optical interference effects that are not achievable with fewer layers.
Solution Approach 2:
The patent creates a composite structure combining multiple metal functional layers with dielectric layers. This composite architecture integrates different materials with complementary properties: metal layers provide infrared reflection while dielectric layers provide optical interference control and protection. The composite structure achieves enhanced solar control performance and expanded aesthetic options compared to simpler single-material coatings.
5Device complexity
If conventional solar control coatings with one to three metal layers are used, then device complexity is lower, but available color space and aesthetic performance are limited
Solution Approach 1:
The patent segments the coating into at least four metal functional layers with dielectric layers between them. This segmentation enables independent optimization of each layer's thickness and material composition to achieve desired color effects. The multiple interfaces create complex optical interference patterns that expand the available color space and aesthetic options compared to simpler coatings.
Solution Approach 2:
The patent changes multiple parameters including the number of layers (from 1-3 to at least 4), the thickness of each layer, and the material composition of metal and dielectric layers. These parameter changes enable precise tuning of optical properties across the visible spectrum, expanding the available color space and aesthetic performance while maintaining manufacturability.
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 coating provides enhanced solar control and aesthetic performance with a reduced SHGC of not greater than 0.29 and a light to solar gain ratio of at least 1.85, while maintaining chemical and mechanical durability.
Implementation Method 1
Solar control coatings block or filter selected ranges of electromagnetic radiation, typically radiation in the infrared region... These coatings reduce the amount of solar energy entering a building through transparencies
Implementation Method 2
a first phase adjustment layer; a first metal functional layer located over the first phase adjustment layer... a second phase adjustment layer located over the first metal functional layer
Data Source
AI summary
A solar control coating includes at least four phase adjustment layers and at least four metal functional layers. At least one of the metal functional layers can be a continuous layer. At least one of the metal functional layers can be a subcritical layer. The solar control coating provides reference IGU values of luminous transmittance no greater than 64%, SHGC of no greater than 0.5, and LSG of at least 1.85.