Generator Cooling Fans with Flap Control for Reverse Flow Prevention
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Solution Overview
Problem
Existing electric generator cooling systems experience reduced efficiency due to reverse air flow through inactive fans, especially at part load conditions, leading to inefficient cooling and increased energy consumption.
Innovation Solution
The implementation of a control system that activates or deactivates cooling fans based on generator temperature, using flaps to ensure all air flow passes through the rotor stator gap and stator gaps, thereby maintaining homogeneous cooling and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If all cooling fans are activated at high power and high outside temperatures, then cooling performance is improved, but energy consumption increases
Solution Approach 1:
The control system dynamically adjusts the number of active cooling fans based on real-time temperature monitoring. When temperature rises above a threshold, additional fans are activated; when temperature drops below a threshold, fans are deactivated. This dynamic adaptation optimizes cooling performance while minimizing energy consumption under varying thermal conditions.
Solution Approach 2:
The system changes the operational parameter (number of active fans) based on temperature conditions. By monitoring generator temperature and adjusting fan count accordingly, the system adapts cooling capacity to match actual thermal demands, avoiding unnecessary energy consumption during low-temperature periods.
2Use of energy by moving object
If a fan is switched off to reduce energy consumption, then energy efficiency is improved, but reverse air flow occurs reducing cooling efficiency
Solution Approach 1:
A flap is introduced as an intermediary element in the air flow path of each cooling fan. When a fan is deactivated, its associated flap closes to block the air flow path, preventing reverse flow through the rotor-stator gap. This intermediary mechanism ensures that even when fans are reduced for energy savings, cooling efficiency is maintained by directing air flow appropriately.
Solution Approach 2:
The flap mechanism proactively prevents reverse air flow before it can occur. By closing the flap when a fan is switched off, the system anticipates and blocks the potential harmful reverse flow path, ensuring air flow always passes through the intended cooling channels (rotor-stator gap and stator gaps) rather than short-circuiting through inactive fans.
3Use of energy by moving object
If the number of active fans is reduced at low temperature or part load, then energy consumption is reduced, but cooling uniformity deteriorates
Solution Approach 1:
The cooling fan system is segmented into multiple independently controllable units, each with its own flap mechanism. This segmentation allows selective activation/deactivation of individual fans based on thermal conditions, enabling flexible configuration of active cooling zones to maintain uniform temperature distribution while reducing overall energy consumption.
Solution Approach 2:
Individual flaps associated with each fan serve as mediators that control air flow paths. When fans are selectively deactivated to reduce energy consumption, their flaps close to prevent air flow disruption, ensuring that active fans maintain proper air flow distribution for uniform cooling across the generator structure.
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 enhances cooling system efficiency by preventing reverse air flow and optimizing fan usage, resulting in improved cooling performance and reduced energy consumption across varying power and temperature conditions.
Implementation Method 1
By means of the fans, air is blown through the rotor stator gap and the stator gaps to cool the generator
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
It is described an electric generator arrangement (1), which comprises a stator (2), a rotor (3) and a plurality of cooling fans (40..42), which in their active state cause air flows (F1, F2) through a rotor stator gap (5) between said rotor (3) and said stator (2) and through stator gaps (6) between axially adjacent segments (7) of said stator (2). The air flows (F1, F2) are directed through the stator gaps (6) in the same direction. A flap (80..82) is arranged in the air flow (F1, F2) of at least one fan (40..42), opening in the active state of said fan (40..42). Moreover a method for operating said electric generator arrangement (1) is disclosed.