Coupling Strip De-Icing Using Skin-Effect Surface Heating
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Solution Overview
Problem
Conductive surfaces on structures like cars, aircraft, and satellites face inefficiencies and safety issues due to ice or water accumulation, which existing heating systems, often bulky and inefficient, fail to address effectively.
Innovation Solution
A heating system using high-frequency alternating electric current to manipulate current density in conductive materials through mechanisms like the skin and proximity effects, increasing effective resistance and localized Joule heating without requiring bulky equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional heating systems are used to prevent ice accumulation on conductive surfaces, then heating function is provided, but the systems become bulky and complex
Solution Approach 1:
The patent replaces traditional mechanical heating systems with electromagnetic induction heating. By using a conductive coating layer and applying alternating magnetic fields, heat is generated directly within the coating through eddy currents, eliminating the need for bulky heating elements, thermostats, and control mechanisms while maintaining effective ice prevention capability
Solution Approach 2:
The patent changes the physical state and properties by using high-frequency alternating magnetic fields to induce eddy currents in the conductive coating. This transforms the heating mechanism from external heat application to internal heat generation through electromagnetic parameter manipulation, achieving compact and efficient de-icing
2Reliability
If traditional heating systems are used to heat conductive surfaces, then ice accumulation is prevented, but energy consumption increases
Solution Approach 1:
The patent replaces traditional resistive or convective heating with electromagnetic induction heating. The alternating magnetic field induces eddy currents directly in the conductive coating, generating heat efficiently at the source with minimal energy loss, thereby reducing overall energy consumption while maintaining reliable ice prevention
Solution Approach 2:
The conductive coating serves a dual function: it acts as both the heating element and the protective surface layer. When exposed to alternating magnetic fields, the coating generates its own heat through eddy currents, eliminating the need for separate heating systems and reducing energy consumption while maintaining ice prevention capability
3Productivity
If high frequency AC current is used to shape current density in conductive medium, then localized heating efficiency is improved, but current density control complexity increases
Solution Approach 1:
The patent applies local quality by using a conductive coating layer with specific electrical properties that concentrates eddy currents at the surface where ice accumulation occurs. The coating's conductivity and thickness are optimized to generate heat locally at the ice-coating interface, improving heating efficiency without complex control mechanisms
Solution Approach 2:
The conductive coating acts as an intermediary between the alternating magnetic field and the ice accumulation. It transforms the magnetic field energy into localized heat at the coating-ice interface through eddy currents, achieving efficient localized heating while simplifying the overall system control
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 system provides efficient, localized heating with reduced current and voltage requirements, enhancing safety and reliability while being easier to install and maintain, and allowing for faster de-icing.
Implementation Method 1
Joule heating, also known as ohmic heating or resistive heating, is the process by which the passage of an electric current through a conductor produces heat. The amount of heat generated by a conducting medium is based on the amount of current passed through the medium and the electrical resistance of the medium.
Implementation Method 2
The skin effect constrains current flow by taking advantage of the tendency of an alternating electric current to become distributed within a conductor such that the current density increases near the surface of the conductor, and decreases with greater depths in the conductor.
Implementation Method 3
The proximity effect can be used to further constrain current flow in the conductor by placing another AC current path near the existing current flowing in the conductor. The proximity effect can also act to lengthen the current path.
Data Source
AI summary
Aspects of the present disclosure can be embodied in a systems for heating an exterior surface of a bulk medium. In one example, the system includes two or more coupling strips spaced apart from one another and attached to the bulk medium. Each of the coupling strips has a multi-layer structure extending along a surface of the bulk medium that forms, in combination with the bulk medium, an electrical transmission line. The multi-layer structure includes a first dielectric layer over the bulk medium, a conductive layer over the first dielectric layer, a second dielectric layer over the conductive layer, and a conductive shielding layer over the second dielectric layer. A power control system is coupled to the conductive layer of each of the coupling strips and to the bulk medium. The power control system is configured to heat the bulk medium by providing current to the coupling strips.