Airplane Window Infrared Heat Reflection Coating

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Solution Overview

Problem

Existing airplane window designs fail to adequately reduce infrared heat radiation from solar radiation entering the cabin, leading to excessive heating and increased burden on air conditioning systems, which affects passenger comfort and fuel efficiency.

Innovation Solution

A metallic coating, specifically containing silver particles, is applied to the outer surface of the outermost window pane to reflect infrared heat radiation away from the cabin, improving the window assembly's ability to maintain desired ambient conditions and increase fuel efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a solar reflective coating with metallic particles is applied on the inboard surface of the inner pane, then some infrared heat radiation is reflected, but further effective reduction in infrared heat transmission is still needed

Engineering Contradiction:

Improveinfrared heat radiation entering cabinVSAvoidfuel efficiency

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The patent inverts the conventional coating placement by applying the infrared-reflective coating on the outboard surface of the outer pane instead of the inboard surface of the inner pane. This reversal positions the reflective layer at the first point of contact with solar radiation, maximizing its effectiveness in blocking infrared heat before it penetrates the window assembly, thereby achieving greater energy savings and improved fuel efficiency.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent employs a composite coating structure combining a clear coat layer with suspended infrared-reflective metallic particles (silver, gold, or aluminum). This composite material approach allows the coating to maintain transparency for visible light while providing superior infrared reflection, achieving both aesthetic requirements and thermal performance beyond what single-material coatings can provide.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If more infrared heat radiation is blocked, then passenger comfort and fuel efficiency improve, but the complexity of the window assembly increases

Engineering Contradiction:

Improveinfrared heat radiation entering cabinVSAvoidwindow assembly structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges the infrared-reflective coating directly onto the existing outboard surface of the outer pane, integrating the thermal protection function into the existing window structure rather than adding separate components. This coating approach combines multiple functions (protection, reflection, aesthetics) into a single integrated layer, avoiding increased structural complexity while achieving superior infrared blockage.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of energy

If the amount of infrared heat radiation is reduced, then the burden on the air conditioning system decreases, but the manufacturing cost of the window assembly increases

Engineering Contradiction:

Improveair conditioning energy consumptionVSAvoidwindow assembly manufacturing

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent replaces the need for complex multi-pane mechanical window structures with a sophisticated coating system applied to a single pane. By using advanced materials science (nanoparticle suspension in clear coat) rather than mechanical complexity, the solution achieves superior thermal performance through a manufacturing process that is actually simpler than assembling multiple thick panes with interlayers, thereby reducing both AC burden and manufacturing complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 silver-coated window assembly achieves up to 60% reflection of heat radiation, significantly reducing the amount of infrared heat entering the cabin, thereby enhancing passenger comfort and improving fuel efficiency by minimizing the load on the air conditioning system.

Implementation Method 1

A protective coating is bonded to the outer surface of the outermost window pane. The protective coating includes a metallic element component, such as gold or silver, having the capability of reflecting infrared heat radiation emanating from solar radiation

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS9694896B1Airplane window having infrared heat reflection capability

Publication Date: 2017.07.04 THE BOEING CO

AI summary

A window assembly particularly for use in a commercial airplane is provided. Many windows are provided on most commercial passenger airplanes. Solar radiation causes the passage of infrared heat radiation through each window assembly into the passenger cabin during daylight hours. The disclosure involves the window assemblies of airplanes and the use of a protective coating that is bonded to the outermost surface of an outermost window pane, with the outermost window pane bonded to an inner window pane of the airplane window assembly. The protective coating has a metallic element component that has the capability of reflecting an effective amount of infrared heat radiation from solar radiation away from passing through the window assembly and into the cabin of the airplane.