Vacuum Insulating Panel Hybrid Core for Thermal Stability
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Solution Overview
Problem
Current vacuum insulating panels (VIPs) face challenges in achieving a balance between thermal performance and dimensional stability, as reducing core density to improve thermal conductivity makes the panels more prone to breakage and handling issues, leading to poor aesthetic appearance and structural integrity.
Innovation Solution
Incorporating a porous, rigid reinforcing member on the surface of the insulating core to form a hybrid core, which maintains dimensional stability and prevents thermal bridging, allowing for reduced core density while enhancing thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If core density is reduced to improve thermal conductivity, then thermal performance is improved, but dimensional stability and handling strength deteriorate
Solution Approach 1:
The patent applies composite materials by combining low-density insulating core material with a porous reinforcing member having substantially smooth outer surfaces. This hybrid structure achieves both low thermal conductivity (3-4 mW/mK) and dimensional stability, resolving the contradiction between thermal performance and structural integrity.
Solution Approach 2:
The reinforcing member is strategically positioned on the surfaces of the insulating core where structural support is needed, rather than throughout the entire volume. This localized reinforcement maintains thermal performance while providing necessary dimensional stability and handling strength.
2Loss of energy
If core density is reduced to improve thermal conductivity, then thermal performance is improved, but handling strength deteriorates
Solution Approach 1:
The hybrid core combining low-density insulating material with a porous reinforcing member provides both excellent thermal insulation (3-4 mW/mK) and sufficient handling strength. The reinforcing member acts as a structural skeleton that prevents breakage during handling while maintaining low overall density.
Solution Approach 2:
The reinforcing member is made of porous material with substantially smooth outer surfaces, which provides structural strength without significantly increasing thermal conductivity. The porous structure allows the material to maintain low density while providing the necessary mechanical strength for handling.
3Loss of energy
If core density is reduced to improve thermal conductivity, then thermal performance is improved, but aesthetic appearance deteriorates
Solution Approach 1:
The porous reinforcing member with substantially smooth outer surfaces serves as a structural skeleton that prevents edge collapse and panel warping. This maintains the aesthetic appearance of the VIP panel while allowing the use of low-density insulating core material for improved thermal performance.
Solution Approach 2:
The hybrid core structure combines the aesthetic benefits of a smooth panel surface with the thermal performance benefits of low-density insulation. The reinforcing member provides the structural integrity needed to maintain aesthetic appearance while the low-density core delivers superior thermal insulation.
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 hybrid core design achieves improved thermal conductivity and aesthetic appeal by maintaining structural integrity and handling strength, with thermal conductivity reduced to 3.0-4.0 mW/mK, outperforming conventional VIPs with higher density cores.
Implementation Method 1
a porous insulating core having an upper surface and a lower surface and sides
Implementation Method 2
The insulating core may comprise a powder based insulating material, for example, fumed silica, precipitated silica or perlite
Implementation Method 3
an envelope, arranged to envelop the hybrid core, and to maintain an applied vacuum within the envelope
Implementation Method 4
the reinforcing member is formed of a porous material, and is substantially rigid
Implementation Method 5
the reinforcing member(s) does not form a thermal bridge across the insulating core
Data Source
AI summary
The present invention relates to a vacuum insulating panel (VIP). The VIP comprises an insulating core (2) having upper (3) and lower surfaces (4) and at least one substantially planar reinforcing member (5) arranged on the upper (3) or lower surface (4) of the core (2). The reinforcing member (5) is porous and substantially rigid. The VIP further comprises a barrier envelope, optionally in the form of a barrier film (6), arranged to envelop the insulating core (2) and the planar member (5). The present invention also relates to methods of manufacturing a vacuum insulating panel (VIP).