Wind Turbine Nacelle Cooling Circuit for Corrosion-Resistant Generator Airflow
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Solution Overview
Problem
Existing wind turbine nacelle cooling systems face challenges in efficiently cooling electrical generators while preventing corrosion from outside air moisture and salt, leading to reduced efficiency and component durability.
Innovation Solution
A nacelle cooling circuit that channels ambient air from outside the nacelle to the air gap between the stator and rotor, using filters to remove mist and ice, and includes a bypass to mix heated air with fresh air, reducing humidity and enhancing cooling efficiency while preventing salt crystal formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If outside air is used for cooling the generator, then cooling efficiency is improved, but corrosion from moisture and salt increases
Solution Approach 1:
A heating element is introduced as an intermediary component between the outside air and the generator. The heating element warms the incoming air to a controlled temperature, creating a modified cooling air stream that maintains cooling efficiency while reducing moisture condensation and salt crystal formation. This intermediary heating step resolves the contradiction by transforming the harmful cold, moist outside air into a beneficial warm, dry cooling medium.
Solution Approach 2:
The temperature parameter of the cooling air is actively changed from ambient outdoor temperature to a elevated controlled temperature. By heating the air before it reaches the generator, the system changes the thermal state of the cooling medium, which reduces relative humidity and prevents condensation. This parameter change allows the system to maintain effective cooling while eliminating the corrosion problem caused by cold, moist air.
2Object-affected harmful factors
If inside air is used for cooling the generator, then corrosion is reduced, but cooling efficiency decreases
Solution Approach 1:
The system merges two air sources - outside air and inside air - into a combined cooling stream. The outside air provides the cooling capacity and volume, while the inside air contributes warmth and lower humidity. This merging of air streams combines the advantages of both sources: the cooling efficiency of outside air with the corrosion protection of inside air, resolving the contradiction between cooling performance and corrosion prevention.
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 solution improves the cooling efficiency and durability of wind turbine generators by effectively removing moisture and salt, extending component life and maintaining high power generation efficiency.
Implementation Method 1
a cooling circuit including at least a first inlet portion (110) for channeling a fluid cooling medium to the gap (31) between the stator and the rotor
Implementation Method 2
a second outlet portion (120) for channeling an heated fluid medium from the gap (31) between the stator and the rotor
Data Source
Figure 1~2
Figure 3
AI summary
A nacelle (10) for a wind turbine (1) comprises an electrical generator (11) having a stator (20) and a rotor (30) with an air gap (31) between the stator (20) and the rotor (30). The stator (20) including an annular support plate (21). A cooling circuit (100) in the nacelle (10) includes at least a first inlet portion (110) for channeling a fluid cooling medium to the gap (31) between the stator (20) and the rotor (30). The first inlet portion (110) of the cooling circuit (100) comprises at least an inlet hole (115) on the annular support plate (21) for letting at least a portion of the cooling medium flow towards the air gap (31).