Vehicle Glazing Layer System for Heat Rejection and Transparency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle interiors become excessively hot due to sunlight exposure, and existing tinting solutions are limited by the need for transparency and compliance with legal regulations, often requiring air conditioning that increases fuel consumption and greenhouse gas emissions.
Innovation Solution
A composite vehicle window with a layer system comprising functional layers made from metals like niobium, tantalum, or molybdenum, combined with dielectric and sacrificial layers, arranged between transparent dielectric layers, which reduces heat input by minimizing visible light reflectivity and maximizing infrared reflectivity, thereby enhancing thermal comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If tinting is applied to reduce heat flow through vehicle windows, then thermal comfort in the vehicle interior is improved, but transparency is reduced and legal regulations regarding window transparency may be violated
Solution Approach 1:
The patent applies a composite layer system comprising multiple functional layers (metal layers from Nb, Ta, Mo, or Zr groups, dielectric layers, and sacrificial layers) deposited on the inner pane. This composite structure enables selective radiation control: the metal layers provide high infrared reflectivity for heat reduction, while the dielectric layers maintain visible light transparency, thus resolving the contradiction between thermal comfort and window transparency
Solution Approach 2:
The layer system is designed with different layers having specialized local functions: metal layers specifically target infrared radiation reflection for heat reduction, dielectric layers optimize visible light transmission for transparency, and sacrificial layers provide oxidation protection. This local functional differentiation allows the window to simultaneously achieve heat rejection and transparency without requiring uniform tinting across the entire window
2Temperature
If air conditioning is used to achieve thermal comfort in the vehicle interior, then temperature control is improved, but fuel consumption and greenhouse gas emissions increase
Solution Approach 1:
The patent converts the harmful solar infrared radiation into a beneficial reflected radiation by using metal layers that specifically reflect infrared wavelengths. This passive radiation control reduces heat entry into the vehicle interior, thereby reducing the cooling load on air conditioning systems and lowering fuel consumption without compromising thermal comfort
3Temperature
If a layer system with high infrared reflectivity is applied to reduce heat input, then thermal comfort is improved, but visible light reflectivity may increase reducing transparency
Solution Approach 1:
The layer system employs selective radiation control where metal layers (Nb, Ta, Mo, Zr) are specifically designed to reflect infrared radiation while dielectric layers are optimized for visible light transmission. This local functional differentiation enables the window to reflect heat (infrared) while maintaining transparency (visible light), resolving the contradiction between heat rejection and visual clarity
Solution Approach 2:
The composite structure of metal layers combined with dielectric layers creates a multi-functional coating system. The metal layers provide infrared reflectivity for heat reduction, while the dielectric layers maintain visible light transparency. This composite material approach allows simultaneous optimization of thermal and optical properties without compromise
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a laminated glass panel for a vehicle opening, comprising two individual panes bonded together by a thermoplastic adhesive layer and a layer system arranged on a pane surface of the individual panes, wherein the layer system comprises at least one functional layer based on at least one metal from the group consisting of niobium, tantalum, molybdenum, and zirconium, and a dielectric layer arranged on the vehicle interior side of the functional layer. It further relates to a single-pane safety glass panel in which a corresponding layer system is applied to a pane surface of the single pane.