Composite Frame Core for Fenestration Thermal and Structural Balance
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Solution Overview
Problem
Fenestration assemblies face challenges in balancing strength and thermal insulation, with metal frames conducting heat and vinyl or polyethylene frames lacking rigidity, leading to inefficiencies in heating and cooling and potential structural issues due to thermal expansion differences.
Innovation Solution
A fenestration assembly featuring a frame core made of composite material, such as polyurethane impregnated with glass fibers, providing high modulus of elasticity and low thermal conductivity, which allows for a robust and thermally insulating structure without the need for additional insulation features, and includes glazing clamps with deflectable arms for secure glazing unit retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal frames are used in fenestration assemblies, then structural strength and rigidity are improved, but thermal insulation performance deteriorates due to high thermal conductivity
Solution Approach 1:
The patent employs a composite frame core consisting of an outer skin and a foam core material. The outer skin provides structural strength and rigidity similar to metal frames, while the foam core material provides thermal insulation. This composite structure resolves the contradiction by combining materials with complementary properties - the skin bears mechanical loads while the core blocks heat transfer.
Solution Approach 2:
The frame is segmented into distinct functional zones: an outer skin layer for structural support and an inner foam core layer for thermal insulation. This segmentation allows each layer to optimize its specific function without compromising the other, enabling the frame to simultaneously achieve high strength and low thermal conductivity.
2Loss of energy
If interposing insulation features are added between frame components, then thermal insulation performance is improved, but structural rigidity deteriorates
Solution Approach 1:
The patent merges the structural and insulating functions into a single integrated frame core component. Rather than adding separate insulation features between frame components, the foam core is bonded between the outer skin layers to form a unified structure. This integration maintains structural continuity and rigidity while providing thermal insulation, avoiding the need to enlarge frame components to compensate for interrupted structural paths.
3Strength
If frame components are enlarged or wall thicknesses are increased to offset decreased modulus of elasticity, then structural rigidity is improved, but weight and profile increase
Solution Approach 1:
The composite construction allows the frame to achieve high rigidity-to-weight ratio. The thin outer skin provides structural continuity while the foam core provides both insulation and structural support through its compressive strength. This enables the frame to maintain rigidity without increasing wall thickness or profile, as the foam core efficiently transfers and distributes loads.
Solution Approach 2:
The foam core material utilizes a porous cellular structure that provides high strength-to-weight ratio. The cellular structure allows the material to maintain rigidity and load-bearing capacity while keeping density low, enabling the frame to achieve required structural performance without increasing profile dimensions or overall weight.
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 achieves a balance of structural integrity and thermal insulation, maintaining a narrow profile while reducing heat transfer coefficients, thus enhancing energy efficiency and minimizing thermal expansion-related issues.
Implementation Method 1
the frames are constructed with vinyl or polyethylene... the thermal conductivities of metal frames readily transmit heat... the frame core includes a composite material having robust structural characteristics and thermal insulating characteristics
Implementation Method 2
the inclusion of interposing insulation features facilitates variations in thermal expansion between separated frame components... the expansion differential warps the fenestration assembly
Data Source
AI summary
A fenestration assembly includes a glazing unit includes a pane spacer between exterior and interior panes proximate glazing unit edges. A fenestration frame is coupled around the glazing unit and includes a frame core extending around the glazing unit. The frame core includes a unitary core wall including a composite material that is hollow and extends continuously from a core interior face to a core exterior face. A metal glazing cap is coupled with the frame core. The metal glazing cap having a cap end indirectly engaged with the glazing unit along the interior pane, and the cap end is remote from the pane spacer. Each of the core exterior face, the pane spacer and the metal glazing cap are thermally isolated from each other with the frame core including the unitary core wall.