Liquid Cooling CDU Control for Heat Rejection and Blockage Prevention
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Solution Overview
Problem
Traditional air cooling methods are inadequate for efficiently managing heat in high-density electronic components, and existing liquid cooling systems face challenges in maintaining efficient operation and preventing blockages, leading to potential thermal shutdowns.
Innovation Solution
A high-density liquid cooling system with a coolant distribution unit (CDU) that includes temperature and pressure monitoring, pump control mechanisms, and bypass valves to maintain efficient heat transfer and prevent blockages, allowing for modular and standardized installation within data centers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional air cooling methods are used, then the system structure is simple, but the cooling efficiency is insufficient for high-density electronic components
Solution Approach 1:
The patent transitions from air cooling to liquid cooling by implementing a coolant circulation system with pumps, heat exchangers, and coolant channels. This hydraulic system enables efficient heat removal from high-density electronic components through liquid coolant flow, directly resolving the insufficient cooling efficiency of air cooling methods.
2Duration of action of stationary object
If liquid cooling systems operate continuously, then cooling performance is maintained, but blockages and contamination accumulate leading to thermal shutdowns
Solution Approach 1:
The patent implements a strainer in the coolant circulation path to preemptively filter out contaminants before they can cause blockages in the cooling system. This preliminary filtration action prevents accumulation of debris that would otherwise lead to thermal shutdowns, enabling continuous operation.
Solution Approach 2:
The patent employs temperature sensors and pressure differential sensors that continuously monitor the cooling system status. When the pressure differential across the strainer indicates clogging or when temperatures approach critical levels, the system provides feedback to trigger alerts or shutdowns, preventing catastrophic failures and enabling maintenance planning.
3Reliability
If strainers are installed to prevent blockages, then system reliability improves, but pressure drop increases reducing coolant flow efficiency
Solution Approach 1:
The patent specifies particular strainer mesh sizes and designs that optimize the balance between filtration effectiveness and pressure drop. By carefully selecting strainer parameters, the system achieves adequate contaminant removal while minimizing the pressure differential that would increase pump energy consumption.
4Reliability
If multiple coolant circuits are used for heat rejection, then heat removal capacity increases, but system complexity and maintenance requirements increase
Solution Approach 1:
The patent divides the cooling system into separate primary and secondary coolant circuits, with the primary circuit handling heat rejection and the secondary circuit providing coolant to electronic components. This segmentation allows independent optimization and maintenance of each circuit while achieving the required heat removal capacity.
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
Enhances cooling efficiency, extends operating time, and prevents thermal shutdowns by dynamically adjusting coolant flow and pressure, ensuring reliable operation of high-density electronic components.
Implementation Method 1
CDUs typically include a liquid to liquid heat exchanger, which allows heat transfer from coolant in a secondary loop to a primary loop
Implementation Method 2
The method includes providing a first pump and a second pump in a coolant distribution unit
Data Source
AI summary
Embodiments of the invention provide a high density liquid cooling system and various monitoring and control methods. Some methods include calculating a heat transfer efficiency of a heat exchanger based on a temperature difference and calculating a total heat rejection value based on the heat transfer efficiency. Some methods include increasing a secondary flow rate in a secondary coolant loop as a maximum allowable pressure is approached to extend an operating time period and avoid thermal shut down of the high density liquid cooling system.