Heating device comprising a glazing substrate coated on both sides
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Solution Overview
Problem
Current heating device glazings with silver-based functional metal layers suffer from insufficient thermal and chemical resistance, leading to defects such as corrosion, scratches, and delamination when subjected to high-temperature heat-treatment cycles in humid environments, affecting both thermal insulation and aesthetics.
Innovation Solution
A glazing design featuring a first stack of indium tin oxide (ITO) layers on the interior face and a second stack with silver-based functional metal layers, each separated by dielectric coatings, to enhance thermal resistance and reduce emissivity, thereby improving thermal insulation and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If silver-based functional metal layers are used to decrease emissivity and improve thermal insulation, then thermal insulation performance is improved, but thermal and chemical resistance deteriorates leading to corrosion and delamination in high-temperature humid environments
Solution Approach 1:
The patent applies composite materials by creating a multi-layer coating structure that combines silver-based functional metal layers with protective dielectric layers and barrier layers. This composite structure maintains the low emissivity property of silver while adding thermal and chemical resistance through the protective layers, preventing corrosion and delamination in high-temperature humid environments.
Solution Approach 2:
The patent uses intermediary protective layers (dielectric coatings and barrier layers) between the silver-based functional metal layer and the external environment. These intermediary layers act as mediators that protect the silver layer from direct exposure to corrosive humid environments while allowing the silver to maintain its thermal insulation function.
2Illumination intensity
If thin silver layers are used to maintain optical transparency and aesthetic qualities, then optical and aesthetic qualities are preserved, but durability deteriorates due to increased susceptibility to corrosion and mechanical damage
Solution Approach 1:
The patent creates a composite coating structure where thin silver layers for optical transparency are combined with multiple protective layers including dielectric coatings and barrier layers. This composite structure provides mechanical protection and corrosion resistance while maintaining the optical properties of the thin silver layer.
Solution Approach 2:
The patent uses thin film technology to create multiple protective layers (dielectric coatings, barrier layers) that form a flexible protective shell around the thin silver layer. These thin films provide protection against mechanical damage and corrosion while maintaining the overall thinness and optical transparency of the coating.
3Reliability
If multiple protective layers are added to enhance thermal resistance and protect silver layers, then durability and thermal resistance are improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the protective coating system into distinct functional layers: silver-based functional metal layers for thermal insulation, dielectric coatings for structural support and additional protection, and barrier layers for corrosion prevention. This segmented approach allows each layer to perform its specific function optimally while maintaining overall system reliability.
Solution Approach 2:
The patent achieves multi-functionality by designing a coating structure where layers serve multiple purposes: dielectric coatings provide both structural support and protective functions, barrier layers prevent corrosion while maintaining thermal performance, and the overall structure provides both durability and thermal insulation. This reduces the need for separate dedicated components.
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 maintains high thermal insulation and user safety while reducing power consumption and the risk of defects, allowing for efficient heat retention within the heating device and minimizing the need for additional cooling measures.
Implementation Method 1
a first stack that reflects heat essentially by virtue of one or more functional layers based on indium tin oxide
Implementation Method 2
substrates coated with functional coatings that reflect infrared (IR) radiation. These coatings allow the amount of energy transmitted to the exterior of the heating device to be decreased by reflecting the heat back toward the interior of the chamber
Implementation Method 3
each separated by dielectric coatings, to enhance thermal resistance and reduce emissivity
Implementation Method 4
a glazing comprising at least one transparent substrate coated on each face with a stack of thin layers... allowing for efficient heat retention within the heating device
Data Source
AI summary
A heating device equipped with a chamber defining a cavity, includes a door or wall incorporating a multiple glazing, the glazing including at least one transparent substrate coated on each face with a stack of thin layers, namely: on a first face, turned toward the cavity, a first stack that reflects heat essentially by virtue of one or more functional layers based on indium tin oxide; and on the other face, turned toward the exterior of the device, a second stack that reflects heat essentially by virtue of one or more functional layers based on a metal chosen from gold or silver.