Multi-section core vacuum insulation panels with hybrid barrier film envelope
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Solution Overview
Problem
Conventional vacuum insulation panels face challenges in maintaining low thermal conductivity over time, with fiberglass panels showing initial improvements but fumed silica panels lagging, and both suffer from edge loss and moisture penetration issues.
Innovation Solution
A multi-layer vacuum insulation panel design featuring a first barrier film without metal, a second barrier film with a metal foil layer, and a multi-section core comprising fumed silica and fiberglass regions, which defines an interior volume with a sealing junction to minimize edge loss and enhance moisture absorption, thereby increasing panel longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single filling material (fiberglass or fumed silica) is used in conventional vacuum insulation panels, then the manufacturing process is simple, but the panel fails to maintain low thermal conductivity over time due to edge loss and moisture penetration
Solution Approach 1:
The core is divided into multiple discrete regions: a first region containing fumed silica and a second region containing fiberglass. This segmentation allows each material to perform its optimal function - fumed silica for initial vacuum maintenance and fiberglass for long-term structural support - thereby resolving the contradiction between reliability and simplicity by creating a multi-region core structure
Solution Approach 2:
The panel employs a composite construction combining two different filling materials (fumed silica and fiberglass) in discrete regions, along with hybrid barrier films (polymeric and metalized). This composite approach leverages the complementary strengths of each material to maintain low thermal conductivity over time, addressing the reliability issue without requiring overly complex manufacturing
2Reliability
If fiberglass is used as filling material, then initial thermal conductivity improves, but moisture penetration and edge loss occur over time
Solution Approach 1:
The fumed silica region is positioned to provide preliminary moisture absorption and vacuum maintenance during the critical early period. This preliminary action protects the fiberglass region from moisture ingress, allowing the panel to maintain performance over extended periods by addressing moisture issues before they can compromise the fiberglass structure
Solution Approach 2:
Different regions of the core are assigned different materials based on their optimal performance characteristics. The fumed silica region provides superior initial moisture absorption and vacuum stability, while the fiberglass region provides long-term structural integrity. This local differentiation resolves the contradiction by optimizing each region for its specific function
3Reliability
If barrier films include metal layers, then barrier performance improves, but manufacturing complexity and cost increase
Solution Approach 1:
Metalized barrier films are applied selectively to specific regions of the panel rather than uniformly across the entire surface. This localized application provides enhanced barrier performance where most needed (at edges and sealing regions) while reducing overall manufacturing complexity and material costs compared to full-metalized construction
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 design achieves improved thermal conductivity and extended panel longevity by minimizing gas and water penetration, with the desiccant region absorbing moisture and maintaining vacuum pressure, resulting in a thermal conductivity of about 3 mW/m·K initially and less than 8 mW/m·K after 10 years.
Implementation Method 1
the desiccant region absorbing moisture and maintaining vacuum pressure
Implementation Method 2
minimizing gas and water penetration
Implementation Method 3
sealing junction between the first barrier film and the second barrier film... to minimize edge loss
Data Source
AI summary
A multi-layer vacuum insulating panel that includes: a first barrier film having at least one polymeric material layer and; a second barrier film having at least one interior polymeric layer, a metal foil layer, and at least one exterior polymeric layer positioned on the opposite side of the metal foil layer as the at least one interior polymeric layer; a sealing junction between the first barrier film and the second barrier film at a sealing section about a perimeter of the first barrier film and the second barrier film where the first barrier film and the second barrier film physically and sealingly engage one another; and a multi-section central core having a first fumed silica region that contains at least one fumed silica compound and at least one fibrous (fiberglass) region that are each discrete regions within the interior volume.