Aircraft Lighting Condensation Mitigation via Capillary Evaporation
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Solution Overview
Problem
Aircraft exterior lights face issues with condensation within their units due to varying atmospheric conditions, leading to reduced emissivity and electrical malfunctions.
Innovation Solution
The solution involves a capillary transport apparatus, such as a wick or fibrous material, coupled to a heat source within the light housing, which collects condensate in a catchment basin and evaporates it using the heat source, diffusing the vapor through a vapor permeable membrane to mitigate condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aircraft exterior lights are exposed to varying atmospheric conditions including temperature, pressure, humidity, and liquid water, then the lights can operate in diverse environmental conditions, but condensation forms within the light unit housing reducing emissivity and causing electrical malfunctions
Solution Approach 1:
The patent converts the harmful effect of condensation into a beneficial process by using the condensate as a heat transfer medium. The capillary transport apparatus wicks condensate from the catchment basin to the heat source, where it is evaporated. This transforms the condensation problem into a controlled evaporation process that removes moisture from the housing interior, thereby preventing harmful condensation while utilizing the thermal energy available.
Solution Approach 2:
The capillary transport apparatus acts as an intermediary between the condensate collection point (catchment basin) and the heat source. This intermediary component facilitates the transfer of condensate from where it collects to where it can be effectively evaporated, enabling the system to manage moisture levels without direct contact between liquid condensate and electrical components.
2Reliability
If a capillary transport apparatus is used to wick condensate to the heat source for evaporation, then condensation is reduced within the housing, but the device complexity increases with additional components
Solution Approach 1:
The capillary transport apparatus is designed to be self-regulating, automatically wicking condensate from the catchment basin to the heat source based on capillary action. This self-service mechanism eliminates the need for external pumps, motors, or control systems, thereby managing condensation effectively while minimizing the addition of complex mechanical components.
Solution Approach 2:
The capillary transport apparatus utilizes porous or fibrous materials that enable liquid transport through capillary action. These materials provide a simple yet effective mechanism for moving condensate without requiring complex mechanical structures, maintaining device simplicity while achieving reliable condensation management.
3Reliability
If the heat source is used to evaporate condensate, then vapor is generated and diffused through the vapor permeable membrane, but energy consumption increases
Solution Approach 1:
The system converts the thermal energy that would otherwise be wasted heat into a useful function for evaporating condensate. By directing the heat source to act on the condensate in the catchment basin, the system recycles thermal energy to achieve vaporization, thereby reducing the net energy consumption compared to using a separate heating mechanism.
Solution Approach 2:
The system utilizes the phase transition from liquid condensate to vapor through evaporation. This phase change allows the condensate to be removed from the housing interior and transported outward through the vapor permeable membrane, effectively eliminating liquid water while utilizing a well-understood physical process that requires relatively minimal energy input.
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 approach effectively reduces condensation within the light housing, maintaining the emissivity and operational integrity of aircraft exterior lights by managing condensate through evaporation and vapor diffusion.
Implementation Method 1
wicking the condensate from the catchment basin to a heat source
Implementation Method 2
evaporating the condensate to generate a vapor
Implementation Method 3
diffusing the vapor through the vapor permeable membrane
Data Source
Figure 1
Figure 2
AI summary
An exterior lamp for an aircraft may comprise a housing (200) defining an interior volume, a heat source (204) disposed within the interior volume of the housing, a light source (216) disposed within the housing configured to emit a light therefrom, a protective lens (218) coupled to the housing proximate the light source, wherein the protective lens is configured to transmit the light, and a capillary transport apparatus having a first end and a second end wherein the first end is coupled to the heat source and the second end is disposed in a catchment basin.