Fenestration Frame Thermal Break Assembly for Heat Transfer Reduction

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Solution Overview

Problem

Fenestration units face challenges in maintaining interior temperature stability due to significant temperature differentials between the interior and exterior environments, leading to inefficient heat transfer.

Innovation Solution

Incorporation of thermal breaks made from materials with low thermal conductivity, such as polymers or polymer composites, coupled to frame members using spline connectors, and optionally with compressible pads to accommodate material expansion, enhancing assembly and thermal efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If metal frame members are used to provide structural strength, then strength is improved, but thermal conductivity increases causing heat transfer between interior and exterior

Engineering Contradiction:

Improveframe member strengthVSAvoidheat transfer

Core Design Contradiction:

StrengthVSLoss of energy

Solution Approach 1:

The frame member is divided into separate components: a metal structural member for strength and a thermal break member with low thermal conductivity to reduce heat transfer. These segmented parts are joined together, allowing each to fulfill its specific function independently.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A thermal break member made of low thermal conductivity material is introduced as an intermediary between the metal frame members. This intermediary component blocks the direct thermal path while allowing structural integrity to be maintained through the metal components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If thermal breaks are added to reduce heat transfer, then thermal efficiency is improved, but assembly complexity increases

Engineering Contradiction:

Improveheat transferVSAvoidassembly complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The thermal break member is designed with integrated features that combine multiple functions into a single component. The foot-receiving channel and spline connector are merged into the thermal break member itself, simplifying the overall assembly process despite the additional component.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The thermal break member includes self-aligning and self-securing features such as the foot-receiving channel and spline connector that automatically position and secure the thermal break to the frame members during assembly, reducing the need for additional fastening operations.

Inventive Principle:

Principle #25Self-service

3Loss of energy

If different materials are used for thermal breaks (e.g., fiberglass vs. thermoplastic), then thermal performance is improved, but accommodation of thermal expansion becomes more difficult

Engineering Contradiction:

Improveheat transferVSAvoidthermal expansion accommodation

Core Design Contradiction:

Loss of energyVSAdaptability or versatility

Solution Approach 1:

The compressible pad's physical parameters (compressibility, thickness) are specifically designed to accommodate the thermal expansion differences between various thermal break materials. This allows the same pad design to work with different materials like fiberglass and thermoplastics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The compressible pad is introduced as an intermediary element between the thermal break member and the frame member. This pad absorbs and accommodates the dimensional changes caused by thermal expansion, allowing the rigid frame structure to coexist with materials that have different thermal expansion characteristics.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively reduces heat transfer between the interior and exterior, maintaining consistent interior temperatures and improving thermal efficiency of fenestration units.

Implementation Method 1

the thermal breaks are constructed of a material having a relatively low thermal conductivity

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

one or more compressible pads that accommodate different thermal expansion characteristics of thermal breaks constructed of different materials

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 3

a compressible pad coupled to the thermal break and configured to be compressed upon thermal expansion of the thermal break

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20260049520A1Fenestration units including thermal breaks

Publication Date: 2026.02.19 PELLA CORP

AI summary

A door/window frame structure for making door/window casing such as doors and/or windows intended to be anchored to a supporting wall, said structure comprising at least one metal end element (2) suited to define the external surface (3) of the door/window frame and a substantially straight insulating element (4) suited to promote thermal insulation between the environments respectively located inside and outside with respect to the door/window frame structure. At least one pair of straight metal profile (13) is provided, which have a first end (16) intended to be directly coupled with the insulating element (4); at least one of the profiles of said pair has a second end (19) suited to be directly anchored to the metal end element (2).