Multi-Fan Airflow Feedback Control for Quiet Server Cooling
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Solution Overview
Problem
Conventional heat dissipation systems in server chassis suffer from noise issues due to non-uniform airflow speeds from fans, leading to eddy formation and reduced cooling efficiency.
Innovation Solution
A heat dissipation system with an external control device and air sensation units that detect airflow states and adjust fan rotational speeds to unify airflow speeds, reducing noise and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple fans are arranged in parallel to enhance heat dissipation, then the air volume for dissipating heat is enhanced, but the airflow speeds of the fans become different leading to eddy formation and noise
Solution Approach 1:
The patent employs air sensation units to detect airflow states and feeds this information back to the control device, which then adjusts fan rotational speeds to achieve uniform airflow. This feedback mechanism enables the system to automatically balance airflow from multiple fans, eliminating eddies and reducing noise while maintaining high heat dissipation efficiency.
Solution Approach 2:
The control device dynamically changes the rotational speed parameter of individual fans based on detected airflow conditions. By adjusting this key parameter, the system achieves uniform airflow speeds from all fans, preventing eddy formation and reducing noise generation while preserving enhanced heat dissipation capability.
2Quantity of substance
If multiple fans are installed at different positions to increase air volume, then heat dissipation is enhanced, but uniform airflow cannot be achieved leading to eddy formation
Solution Approach 1:
Air sensation units detect the actual airflow state from each fan and provide feedback to the control device. This enables real-time monitoring and adjustment of airflow uniformity across all fans, ensuring stable and consistent airflow composition even when fans are positioned at different locations to maximize air volume.
Solution Approach 2:
The system dynamically adjusts the rotational speeds of fans based on real-time airflow detection. This dynamic control allows the system to maintain uniform airflow composition despite variations in fan positions, transforming a static configuration problem into a dynamically adjustable solution.
3Temperature
If fan rotational speeds are increased to improve cooling, then heat dissipation is enhanced, but airflow non-uniformity increases leading to more eddies and noise
Solution Approach 1:
The control device uses feedback from air sensation units to monitor airflow uniformity while fans operate at high speeds. When non-uniformity is detected, the control device adjusts individual fan speeds to restore uniformity, enabling high cooling efficiency without the negative effects of eddy formation and noise.
Solution Approach 2:
The system dynamically changes rotational speed parameters of individual fans based on detected airflow conditions. This allows the maintenance of high overall cooling performance while preventing any single fan from creating disruptive eddies or noise, achieving both high temperature control and low noise operation.
Data Source
AI summary
A heat dissipation system with air sensation function includes a chassis, multiple fans, multiple air sensation units and an external control device connected to the fans. The chassis has an installation face for installing the fans thereon. The air sensation units are respectively disposed on the fans for detecting the air state of the corresponding fans to generate an air sensation signal. The external control device serves to receive the air sensation signal transmitted from the air sensation units and compare the data contained in the air sensation signal with preset data so as to control/adjust the rotational speed of the corresponding fans. Accordingly, a uniform airflow flows out of the fans to effectively lower the noise.