Multi-stage Air Mover for High-Pressure Computer Cooling
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Solution Overview
Problem
Centrifugal fans in supercomputer systems fail to move sufficient air for adequate cooling in densely packed computer cabinets, leading to overheating due to increased pressure drop and reduced flow rate, with solutions like increasing fan size or speed resulting in higher power consumption and noise.
Innovation Solution
A multi-stage air mover system with rotating blade sets in annular arrangements and a stationary blade set is used to enhance air flow, featuring a motor-driven configuration that dynamically adjusts speed to maintain efficient cooling without excessive power consumption or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the centrifugal fan increases the output pressure differential to compensate for the increased pressure drop, then the pressure differential is improved, but the flow rate of the cooling air is significantly reduced
Solution Approach 1:
The single centrifugal fan is replaced with a multi-stage air mover consisting of multiple impellers and diffusers arranged in series. Each stage contributes to the overall pressure differential while maintaining efficient airflow. The first impeller generates initial pressure, the first diffuser converts kinetic energy to pressure, the second impeller adds more pressure, and the second diffuser finalizes the pressure conversion, achieving both high pressure differential and maintained flow rate.
Solution Approach 2:
The air mover transitions from a single-stage radial flow to a multi-stage axial-flow configuration. By stacking multiple impellers and diffusers in series along the airflow path, the system achieves higher pressure differentials without the flow rate penalty associated with single-stage fans operating at high pressure.
2Productivity
If the size of the centrifugal fan is increased to increase cooling air flow, then the flow rate is improved, but the power consumption increases
Solution Approach 1:
Instead of using one large fan, the system employs multiple smaller impellers working in series. Each impeller operates within an efficient size range, and their combined effect achieves the required total airflow. This segmentation allows for more efficient energy conversion at each stage compared to a single large fan.
Solution Approach 2:
The system changes the operating parameters by using multiple stages with optimized impeller and diffuser geometries. Each stage is designed to operate at optimal flow coefficients and pressure ratios, achieving high overall airflow with reduced power consumption compared to a single-stage system requiring the same airflow.
3Productivity
If the operating speed of the centrifugal fan is increased to increase cooling air flow, then the flow rate is improved, but the operating noise and power consumption increase substantially
Solution Approach 1:
The single high-speed fan is replaced with multiple impellers operating at moderate speeds. Each impeller contributes to the total airflow, and the combined effect achieves the required cooling capacity with lower individual speeds that generate less noise. The diffusers between stages further reduce turbulence and noise from the airflow.
Solution Approach 2:
The system transitions from a single-stage high-speed radial fan to a multi-stage moderate-speed axial flow system. By distributing the airflow generation across multiple stages, the operating speed of each component is reduced, thereby substantially reducing the harmful noise while maintaining the required cooling air flow.
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 multi-stage air mover system achieves higher pressure and efficient cooling with lower operating speeds, effectively addressing the overheating issue in densely packed computer cabinets while minimizing power consumption and noise.
Implementation Method 1
centrifugal fans 120 mounted to upper portions of corresponding computer cabinets 110. In operation, each of the centrifugal fans 120 draws cooling air into the corresponding computer cabinet 110 through a front inlet 114 and/or a back inlet 115 positioned toward a bottom portion of the computer cabinet 110. The cooling air flows upwardly through the computer cabinet 110, past the computer modules 112, and into a central inlet 122 of the fan 120. The centrifugal fan 120 then exhausts the cooling air outward in a radial pattern through a circumferential outlet 124.
Data Source
AI summary
Multi-stage air movers for cooling computers and other systems are described herein. In one embodiment, a computer system includes a computer cabinet holding a plurality of computer modules. The computer cabinet includes an air inlet and an air outlet. The computer system further includes a multi-stage air mover configured to move a flow of cooling air from the air inlet, past the plurality of computer modules, and out the computer cabinet via the air outlet.