Vacuum Insulated Panel with Ceramic Spacers for Lower Heat Transfer
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Solution Overview
Problem
Metal spacers in vacuum insulated panels face limitations such as low compressive stress, thermal mismatch with glass substrates, and high thermal conductivity, leading to issues like micro-cracking, increased thermal transfer, and aesthetic concerns.
Innovation Solution
Ceramic spacers with compressive and tensile stress regions, chemically strengthened via ion exchange processes, are used to support larger spacer separations, match thermal expansion coefficients with glass, and reduce thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal spacers are used to maintain vacuum separation, then the structural strength and vacuum load support are improved, but the thermal conductivity increases leading to reduced insulation performance
Solution Approach 1:
The patent changes the material parameter from metal to ceramic, fundamentally altering the thermal conductivity while maintaining mechanical strength. Ceramic materials have thermal conductivity 10-100 times lower than metal spacers, directly reducing thermal bridge effects and energy loss through the spacer while preserving the ability to support vacuum loads.
Solution Approach 2:
The patent employs ceramic materials that combine the desirable properties of both metal (structural strength, vacuum load support) and glass (low thermal conductivity, aesthetic transparency). This composite approach creates a spacer that simultaneously achieves mechanical reliability and thermal insulation performance.
2Strength
If metal spacers are used for vacuum insulation, then the vacuum load support is improved, but the coefficient of thermal expansion mismatch with glass substrates causes micro-cracking
Solution Approach 1:
The patent changes the thermal expansion parameter by switching from metal to ceramic material. Ceramic spacers have coefficients of thermal expansion (6-14 x 10^-6 /K) that closely match glass substrates, eliminating the thermal mismatch problem that causes micro-cracking during temperature cycling while maintaining vacuum load support capability.
Solution Approach 2:
The patent creates material homogeneity in thermal expansion characteristics between the spacer and glass substrate. This reduces differential thermal stress and prevents micro-cracking at the interface, improving the reliability and longevity of the vacuum insulated panel under asymmetric thermal conditions.
3Loss of energy
If larger spacer separations are used to reduce thermal conduction through spacers, then the thermal insulation is improved, but the structural stability under vacuum load deteriorates
Solution Approach 1:
The patent changes the material density and strength parameters by using ceramic materials. Ceramic spacers provide sufficient mechanical strength to maintain structural stability at larger separation distances (60-120 mm) where metal spacers would fail under vacuum load, enabling both improved thermal insulation and maintained structural integrity.
4Illumination intensity
If transparent spacer materials are used to maintain aesthetics, then the visual appearance is improved, but the compressive strength under vacuum load is reduced
Solution Approach 1:
The patent uses transparent ceramic materials that combine the optical properties of glass (transparency, aesthetics) with the mechanical properties of ceramic (high compressive strength, low thermal conductivity). This allows the spacer to be visually invisible while providing superior structural and thermal performance.
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 ceramic spacers enhance panel durability, improve thermal insulation, and maintain aesthetics by allowing larger spacer separations, reducing heat transfer, and minimizing glass defects.
Implementation Method 1
Chemically strengthened via ion exchange processes
Implementation Method 2
Providing a vacuum in the space between the substrates reduces conduction and convection heat transport
Implementation Method 3
Providing a vacuum in the space between the substrates reduces conduction and convection heat transport
Implementation Method 4
reducing radiative energy with a low-emissivity (low-E) coating provided on one of the substrates
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A vacuum insulating panel includes first and second substrates (e.g., glass substrates), a hermetic edge seal, a pump-out port, and spacers sandwiched between at least the two substrates. The gap between the substrates may be at a pressure less than atmospheric pressure to provide insulating properties. The vacuum insulating panel may include ceramic (e.g., aluminosilicate glass) spacers, which may be chemically strengthened.