Composite Pane With Thermal-Radiation-Reflecting Coating for Lower Heat Loss
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Solution Overview
Problem
Existing electrically heatable composite panes in vehicles inefficiently conduct heat from the heating element to the outer pane, leading to high energy consumption for removing ice and snow due to thermal conduction differences between glass and thermoplastic layers, with significant energy loss to the exterior.
Innovation Solution
Applying a thermal-radiation-reflecting coating directly on the interior or exterior surfaces of the panes and positioning the heatable element on the inner or outer pane surfaces to reduce thermal radiation emission, enhancing heat retention and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the heating element is arranged on the outer side of the inner pane, then the heating function can be provided, but the heat is primarily conducted to the inner pane and hardly to the outer pane via the thermoplastic intermediate layer, resulting in high energy consumption for removing ice and snow on the outer side
Solution Approach 1:
The patent applies a thermal-radiation-reflecting coating with low emissivity to the outer surface of the outer pane. This coating converts the harmful thermal radiation loss into a beneficial effect by reflecting heat back into the composite pane structure, thereby reducing energy consumption for heating while maintaining effective ice and snow removal on the outer surface.
Solution Approach 2:
The patent creates a composite structure combining the thermoplastic intermediate layer with a thermal-radiation-reflecting coating layer on the outer pane surface. This composite material system leverages the thermal conduction properties of the thermoplastic layer and the radiation reflection properties of the coating to achieve improved heat distribution and reduced energy loss simultaneously.
2Productivity
If a thermal-radiation-reflecting coating is applied on the exterior-side surface of the outer pane and/or interior-side surface of the inner pane, then thermal radiation loss is minimized and heating efficiency is improved, but the device complexity increases
Solution Approach 1:
The thermal-radiation-reflecting coating serves multiple functions simultaneously: it reflects thermal radiation to reduce heat loss, provides a durable protective layer on the glass surface, and maintains optical transparency for visibility. This multi-functionality justifies the added structural complexity by delivering multiple benefits from a single component.
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 composite pane achieves more efficient heating with reduced power consumption by minimizing thermal radiation loss to the interior or exterior, allowing faster heating and lower energy usage.
Implementation Method 1
When a voltage is applied, the heating element heats up
Implementation Method 2
the heat is transported into the thermoplastic intermediate layer of the composite pane, the outer pane, and the inner pane by thermal conduction
Implementation Method 3
a thermal-radiation-reflecting coating is applied directly on the interior-side surface of the inner pane and/or a thermal-radiation-reflecting coating is applied directly on the exterior-side surface of the outer pane
Data Source
AI summary
A composite pane includes a laminated stacking sequence composed of an outer pane with an exterior-side surface and an interior-side surface, an inner pane with an exterior-side surface and an interior-side surface, and at least one thermoplastic intermediate layer, which joins the interior-side surface of the outer pane to the exterior-side surface of the inner pane, wherein a heatable element is applied directly on the interior-side surface of the outer pane or on the exterior-side surface of the inner pane, and a thermal-radiation-reflecting coating is applied directly on the interior-side surface of the inner pane and/or a thermal-radiation-reflecting coating is applied directly on the exterior-side surface of the outer pane.