Segmented Wind Turbine Rotor Blade Heating for Icing Control
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Solution Overview
Problem
Existing wind turbine rotor blade heating systems face challenges in achieving a balanced heating output that effectively prevents icing while minimizing energy consumption and avoiding damage to the rotor blade, particularly in varying operating conditions.
Innovation Solution
A wind turbine rotor blade with an electrical heating device that includes two outer electrical conductors and at least one central conductor, allowing for separate heating of distinct sub-regions along the blade's length, enabling targeted heating and adjustable output through series or parallel connections, with the option to integrate carbon fiber materials for enhanced conductivity and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire heated surface area is heated uniformly, then sufficient temperature difference is established to prevent icing, but energy consumption increases excessively
Solution Approach 1:
The heated surface area is divided into multiple sub-areas, each with its own heating element and electrical conductor connections. This allows selective activation of only the sub-areas that require heating based on local icing conditions, rather than heating the entire surface uniformly, thereby reducing overall energy consumption while maintaining effective icing prevention where needed.
Solution Approach 2:
Different sub-areas of the rotor blade receive different heating treatments based on their specific icing susceptibility. The heating system enables localized heating of critical areas (such as the leading edge) while reducing or eliminating heating in less critical areas, optimizing the balance between icing prevention effectiveness and energy consumption.
2Reliability
If heating output is increased to ensure effective de-icing, then icing is reliably prevented, but risk of damage to the rotor blade increases
Solution Approach 1:
The heating system allows dynamic adjustment of heating output in different sub-areas based on real-time operating conditions and icing detection. The electrical conductors can be configured to provide varying levels of heating power to different regions, enabling the system to apply high heating output only when and where icing is detected, rather than maintaining high output continuously across the entire blade surface.
Solution Approach 2:
The heating system operates in a controlled, periodic manner rather than continuously at maximum output. Heating is activated only when icing conditions are detected in specific sub-areas, and can be deactivated or reduced when conditions improve, thereby preventing thermal damage while maintaining effective de-icing capability when needed.
3Adaptability or versatility
If the heating system is designed with multiple conductors for selective heating, then heating output can be adjusted for different operating conditions, but device complexity increases
Solution Approach 1:
The electrical conductors serve multiple functions: they provide electrical connections for heating current delivery, act as structural support elements, and can be integrated with the rotor blade's existing electrical infrastructure. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity despite the added adaptability of selective heating capability.
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 configuration allows for efficient, targeted heating of critical areas, optimizing energy use and preventing icing, while minimizing the risk of damage by allowing for adjustable heating output and robust electrical conductivity, thus addressing the need for a simple and effective heating solution under different operating conditions.
Implementation Method 1
They consist of an electrically conductive material and, during operation, a heating current flows through them, which warms the device. This allows existing ice to be melted (de-icing), on the other hand, icing can be prevented (anti-icing).
Data Source
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AI summary
Wind turbine rotor blade with • an electric heating device for heating a heatable surface area extending over a longitudinal section of the wind turbine rotor blade, wherein the electric heating device has a tip-side end, a root-side end and two trailing-edge-side edges, and • two external electrical conductors connected to the electric heating device along the trailing-edge-side edges and through which the electric heating device can be supplied with a heating current, wherein • at least one central electrical conductor connected to the electric heating device at a distance from the two trailing-edge-side edges such that the electric heating device is divided by the at least one central electrical conductor into at least two sub-areas extending over the longitudinal section,which can be supplied with an electric heating current separately via two of the conductors.