System and method for cooling system pump control
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Solution Overview
Problem
The challenge in liquid-cooled direct-to-chip cooling systems for data centers is the risk of filter clogging leading to catastrophic failures due to increased differential pressure, which current control methods exacerbate, necessitating a solution to ensure filter cleanliness and prevent system failures.
Innovation Solution
Implementing an additional alarm system to selectively shut down CDU components when differential pressure exceeds thresholds, coupled with methods to control pump units and filter maintenance, thereby preventing failures and ensuring efficient cooling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filters with small capture diameter (25μ-50μ) are used to ensure cleanliness, then filter effectiveness is improved, but filter reliability deteriorates due to clogging and rupture risk
Solution Approach 1:
The system performs preliminary detection of differential pressure across the filter before catastrophic failure occurs. By continuously monitoring dP and comparing against predetermined thresholds, the system detects filter loading conditions in advance and triggers warnings or shutdowns before the filter ruptures, preventing the harmful effect while maintaining the beneficial fine filtration capability
Solution Approach 2:
The system implements feedback control by continuously measuring differential pressure across the filter and using this information to control pump operation. When dP exceeds thresholds, the system provides feedback through warnings or shutdown commands, creating a closed-loop control system that prevents filter rupture while maintaining effective filtration
2Productivity
If pump speed is increased to meet IT load flow requirements, then cooling productivity is improved, but differential pressure across filters increases causing clogging
Solution Approach 1:
The system dynamically adjusts pump speed based on real-time differential pressure measurements. Rather than operating at fixed high speed, the pump speed is continuously adapted to maintain cooling productivity while preventing excessive dP that would cause filter clogging, resolving the contradiction between productivity and reliability
Solution Approach 2:
The system uses feedback control where pump speed is adjusted based on measured differential pressure across the filter. This closed-loop control allows the system to maintain high cooling productivity when filters are clean while automatically reducing speed to prevent clogging when filters become loaded
3Device complexity
If current control methods are used without additional alarm systems, then device complexity is reduced, but system reliability deteriorates due to undetected filter contamination
Solution Approach 1:
The system replaces complex mechanical filter monitoring mechanisms with a simpler electronic differential pressure sensor and controller system. This substitution maintains low device complexity while dramatically improving reliability through automated detection and control, preventing filter rupture without requiring complex mechanical safety devices
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 solution effectively prevents catastrophic failures by detecting filter contamination early, reducing the risk of damage to cold plates and other components, and maintaining system integrity through controlled pump operations.
Implementation Method 1
measuring, by a sensor, a differential pressure at a filter connected to a pump
Implementation Method 2
controlling a speed of the pump to satisfy a flow requirement of IT loads
Implementation Method 3
a heat exchanger; wherein the pump is selectively communicating with the heat exchanger
Data Source
AI summary
A method of controlling a coolant distribution unit is disclosed. The method includes: starting, by a controller, a pump control mode; measuring, by a sensor, a differential pressure at a filter connected to a pump; determining, by the controller, whether the differential pressure is greater than a first predetermined value; upon determining that the differential pressure is greater than the first predetermined value, determining whether the differential pressure is greater than a second predetermined value, wherein the second predetermined value is greater than the first predetermined value; and upon determining that the differential pressure is less than or equal to the second predetermined value, generating a first output.