Aircraft Window Bezel Relief Passages for Condensation Control

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Solution Overview

Problem

Aircraft window systems with electro-optic elements face challenges in minimizing condensation due to temperature and humidity differences, leading to potential degradation of the electro-optic elements and aesthetic issues from moisture buildup.

Innovation Solution

The aircraft window mounting assembly incorporates a bezel with a channel for the electro-optic element, along with relief passages that maintain consistent temperature and pressure, limiting moisture exchange between cavities to reduce condensation, and includes a dust cover and compliant materials like foam to enhance sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the electro-optic element is installed in the window assembly, then the window functionality is improved, but condensation occurs due to temperature and humidity differences

Engineering Contradiction:

Improvewindow functionalityVSAvoidcondensation

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The window assembly is divided into separate cavities (exterior cavity and interior cavity) isolated by a bezel, with controlled fluid communication paths. This segmentation prevents uncontrolled moisture migration while allowing pressure equalization, resolving the condensation issue without compromising electro-optic element functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bezel acts as an intermediary structure between the exterior and interior environments, creating buffered cavities that mediate the temperature and humidity differences. The relief passages serve as controlled intermediaries for pressure equalization, preventing condensation while maintaining electro-optic element operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If sealing is enhanced to prevent moisture, then condensation is reduced, but heat buildup may occur

Engineering Contradiction:

ImprovecondensationVSAvoidheat buildup

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The bezel structure provides different properties in different locations: tight sealing in most areas to prevent moisture, but dedicated relief passages for pressure and heat management. This local differentiation resolves the contradiction between sealing and heat dissipation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system changes the physical parameters (pressure, temperature, humidity) in different cavities independently through controlled fluid communication. The relief passages allow dynamic parameter adjustment to prevent both condensation and excessive heat buildup, maintaining optimal conditions for the electro-optic element.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If relief passages are added to manage pressure, then condensation is minimized, but device complexity increases

Engineering Contradiction:

ImprovecondensationVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The relief passages serve multiple functions simultaneously: pressure equalization, heat management, and condensation prevention. This multi-functionality reduces overall system complexity by combining several protective functions into a single structural feature rather than requiring separate systems for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This design effectively minimizes condensation and heat buildup, ensuring the electro-optic element's performance and aesthetic integrity by maintaining a consistent environment within the window assembly.

Implementation Method 1

A first relief passage is in fluid communication with the exterior cavity and the interior cavity

Methodology Applied

Scientific EffectPressure equalization: Pressure Gradient

Implementation Method 2

The foam bezel at least partially defines an exterior cavity. The foam bezel also at least partially defines an interior cavity

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS9365281B2Reducing condensation in dimmable window systems

Publication Date: 2016.06.14 GENTEX CORP

AI summary

An aircraft window mounting assembly having a pressure pane in abutting contact with an inner surface of an exterior pressure pane frame. A bezel is proximate a periphery of the pressure pane and defines an inner opening. The bezel includes an inner wall, an outer wall, an exterior wall, and an interior wall. A dust cover is proximate the interior wall of the foam bezel. An electro-optic element is disposed in the opening and is configured for reception by the inner wall. The pressure pane, the foam bezel, and the electro-optic element define an exterior cavity. The bezel, the electro-optic element, and the dust cover define an interior cavity. A first relief passage is in fluid communication with the exterior cavity and the interior cavity. A second relief passage is in fluid communication with the interior cavity and one of an aircraft interior cabin and an aircraft wall.