Vehicle Window Heat Distribution via Metal Conduction
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Solution Overview
Problem
Heatable vehicle windows face challenges in achieving uniform heat distribution, leading to hot spots and thermal stresses due to inhomogeneous heating power caused by conductive coatings and communication windows, which can impair visibility and safety.
Innovation Solution
A laminated vehicle window design incorporating a thermoplastic intermediate layer with a transparent, electrically heatable coating and strategically placed metal elements for thermal conduction to dissipate heat from high-generation regions to lower-generation areas, improving heat distribution homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent, heatable coating is applied to the vehicle window, then the window can be heated to prevent condensation and ice, but inhomogeneous heat distribution occurs causing hot spots and thermal stresses
Solution Approach 1:
The patent introduces communication windows with varying transparency levels (fully transparent, partially transparent, patterned) at different locations on the vehicle window. These local variations in coating quality allow electromagnetic radiation to pass through specific areas while maintaining heating functionality in other regions, thus creating localized heat distribution patterns that prevent hot spots while ensuring communication functionality.
Solution Approach 2:
The heating coating is segmented into multiple regions with different transparency characteristics. The window includes heated regions with conductive coating and communication regions with reduced or no coating, creating distinct functional zones. This segmentation allows independent optimization of heating performance and communication functionality in different areas.
2Loss of information
If communication windows are created to ensure radio data communication, then electromagnetic radiation can pass through, but the heating power distribution becomes strongly inhomogeneous
Solution Approach 1:
The patent implements communication windows with specific transparency properties at predetermined locations where communication is needed. By locally modifying the coating transparency rather than making the entire window transparent, the solution maintains heating functionality in most areas while enabling electromagnetic radiation passage at specific communication zones.
Solution Approach 2:
The patent uses intermediate transparency levels (partially transparent coatings) as a mediator between the conflicting requirements of heating and communication. These partially transparent regions allow some electromagnetic radiation to pass through while still providing partial heating, serving as a transition zone between fully heated areas and fully transparent communication areas.
3Illumination intensity
If the conductive coating is made more transparent to improve visibility, then optical requirements are met, but the heating efficiency and uniformity decrease
Solution Approach 1:
The window surface is divided into multiple zones with different coating densities: regions with full coating for heating, partially transparent regions for balanced heating and visibility, and fully transparent regions for maximum visibility and communication. This segmentation allows each zone to be optimized for its specific function.
Solution Approach 2:
The patent employs composite coating structures with varying material compositions and thicknesses to achieve different transparency levels in different regions. By using composite material properties, the window can simultaneously provide heating functionality, visibility, and communication capabilities in an integrated structure.
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 mitigates hot spots and enhances heating uniformity, ensuring safer and more efficient heat management, preventing burns and damage while maintaining transparency and functionality.
Implementation Method 1
heat is dissipated out of a region of the heating field with elevated heat generation by means of thermal conduction of the metal element into a region with lower heat generation
Implementation Method 2
A current flows through the coating between the busbars, forming a heating field
Data Source
AI summary
A heatable laminated vehicle window for separating a vehicle interior from an outer surrounding area is presented. The vehicle window includes an outer pane bonded to an inner pane via a thermoplastic intermediate layer. An electrically heatable coating of the vehicle window is electrically connected to two busbars such that by applying a supply voltage across the two bus bars, a heating current that forms heating field flows between the two busbars. In one aspect, a metal element is arranged on or in the vehicle window such that heat is dissipated out of a region of the heating field that has elevated heat generation by means of thermal conduction of the metal element.