Pyrolytic Coated Tinted Glass for Solar Heat and Color Control
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Solution Overview
Problem
Existing coated glass technologies face challenges in achieving a combination of high visible light transmittance, color neutrality, and low solar radiation transmittance, particularly in tinted glass substrates, which are difficult to attain cost-effectively.
Innovation Solution
A multi-layer pyrolytic coating stack comprising a color suppression coating, a doped tin oxide layer, and a silica overcoat is deposited on a tinted glass substrate using atmospheric pressure chemical vapor deposition during the float glass manufacturing process, specifically designed to achieve low hemispherical emissivity and a solar heat gain coefficient ≤0.55.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a multi-layer coating is deposited on tinted glass to achieve low solar heat gain coefficient and low hemispherical emissivity, then solar radiation control is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The coating system is divided into multiple functional layers: a first coating layer (e.g., metal oxide like tin oxide or zinc oxide) for solar radiation control, a second coating layer (e.g., silicon oxide or silicon nitride) for protection and additional optical control, and an intermediate layer for adhesion and stress management. Each layer serves a specific function, allowing optimization of solar heat rejection while maintaining manufacturability through specialized division of labor among layers.
Solution Approach 2:
The patent employs composite coating structures combining different material types (metal oxides, metal nitrides, metal carbides, silicates) in specific sequences. These composite structures leverage the complementary properties of each material to achieve low solar heat gain coefficients and low hemispherical emissivity while managing optical and mechanical requirements through material selection and layer configuration.
2Illumination intensity
If a color suppression coating is deposited on tinted glass to achieve color neutrality, then appearance quality is improved, but the number of coating layers and manufacturing steps increase
Solution Approach 1:
The patent combines color suppression functionality with solar control functionality in integrated coating designs. The first coating layer (metal oxide) and second coating layer (silicon oxide/nitride) are configured to simultaneously suppress unwanted colors from the tinted substrate while controlling solar radiation transmission. This merging of functions reduces the need for separate color suppression and solar control coating systems.
Solution Approach 2:
Different regions of the coating structure are designed with specific optical properties tailored to local requirements. The intermediate layer and specific coating layers are engineered with particular thicknesses, compositions, and optical characteristics to address color suppression needs in specific spectral regions while maintaining overall color neutrality and solar control performance.
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 effectively enhances visible light transmittance while minimizing solar heat gain and emissivity, making the coated glass suitable for architectural and vehicle windows, particularly meeting stringent standards for non-road vehicles.
Implementation Method 1
The coatings described above are preferably formed during a float glass manufacturing process by a chemical vapor deposition method, particularly by atmospheric pressure chemical vapor deposition (APCVD).
Implementation Method 2
Deposition of a doped tin oxide coating over the color suppression coating and a silica overcoat over the doped tin oxide coating have surprisingly been found to create a coated glass article having, in combination, a hemispherical emissivity 70% and a solar heat gain coefficient ≤0.55.
Data Source
AI summary
The invention relates to a multi-layer pyrolytic coating stack deposited on a tinted glass substrate to form a coated glass article exhibiting a desired combination of emissivity, visible light transmittance and solar heat gain coefficient. A method for depositing the multi-layer coating stack on the tinted glass substrate is also part of the invention.