Multiple Glazing Sash Thermal Breakage Prevention
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Solution Overview
Problem
Multiple glazing sashes with four or more glass plates face thermal breakage issues due to temperature differences between the edges and main surfaces of Low-E glass plates, particularly when all intermediate glass plates are coated with low-emissivity films, leading to increased edge stress and risk of thermal breakage.
Innovation Solution
A multiple glazing sash design featuring a first and second glass plate with low-emissivity films, and three intermediate glass plates where one is a transparent glass plate without a low-emissivity film, positioned at the center to allow solar radiation heat transmission, reducing temperature rise and edge stress, while maintaining thermal insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If all intermediate glass plates are made of Low-E glass to improve thermal insulation performance, then thermal insulation performance is improved, but thermal breakage risk increases due to temperature differences between main surface and edge
Solution Approach 1:
The patent applies local quality by differentiating the material properties of intermediate glass plates based on their position. Specifically, the intermediate glass plates adjacent to the first and second glass plates are made of Low-E glass for thermal insulation, while the intermediate glass plate at the center is made of transparent glass without low-emissivity film. This local differentiation allows each region to serve its specific function: edge regions benefit from thermal reflection, while the center region avoids thermal breakage by allowing solar heat transmission.
Solution Approach 2:
The patent segments the intermediate glass plates into different types based on their functional requirements. Instead of using a uniform material for all intermediate glass plates, the invention divides them into Low-E glass plates (for thermal insulation at edges) and transparent glass plates (for thermal breakage prevention at center), thereby resolving the contradiction between thermal insulation and thermal breakage risk.
2Reliability
If usual transparent glass plate with large emissivity is used for intermediate glass plate to prevent thermal breakage, then thermal breakage risk is reduced, but solar heat transmission increases reducing thermal insulation performance
Solution Approach 1:
The patent applies local quality by strategically placing transparent glass plates only at specific positions (center intermediate glass plates) where thermal breakage risk is highest, while maintaining Low-E glass at edge positions for thermal insulation. This localized application ensures that transparent glass prevents thermal breakage where needed without compromising overall thermal insulation performance.
Solution Approach 2:
The patent segments the intermediate glass plates into functional groups: Low-E glass plates for thermal insulation and transparent glass plates for thermal breakage prevention. This segmentation allows the system to simultaneously achieve both thermal insulation performance and thermal breakage prevention by assigning appropriate materials to appropriate locations.
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
This configuration effectively prevents thermal breakage of intermediate glass plates while maintaining high thermal insulation performance by managing temperature differences and edge stress, ensuring the longevity and efficiency of the glazing system.
Implementation Method 1
each of the first glass plate and the second glass plate has a low-emissivity film, at least one intermediate glass plate among the above three intermediate glass plates has a low-emissivity film
Implementation Method 2
one intermediate glass plate disposed at the center among the three intermediate glass plates, is a transparent glass plate having no low-emissivity film
Data Source
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AI summary
To provide a multiple glazing sash comprising four or more glass plates, which is capable of preventing thermal breakage of intermediate glass plates while securing thermal insulation performance. According to a multiple glazing glass 120 in an embodiment, low-emissivity films 166A, 166B, 166C and 166D such as Low-E films are formed on the inner surfaces of glass plates 122 and 124, facing a divided hollow space 130, and on the inner surfaces of intermediate glass plates 126A and 126C, facing intermediate glass plate 126B. Namely, the glass plates 122 and 124 and the intermediate glass plates 126A and 126C are constituted as Low-E glass. And, the intermediate glass plate 126B disposed at the center is a common transparent glass plate having no low-emissivity film.