Rack Heat Exchanger Coolant Recirculation to Prevent Condensation
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Solution Overview
Problem
The increasing power dissipation in integrated circuit chips poses a cooling challenge, particularly in large server applications where traditional air-cooling methods are insufficient, leading to inefficient heat management and stress on room air-conditioning systems.
Innovation Solution
A coolant-cooled heat exchanger and control apparatus are integrated with electronics racks, utilizing a recirculation system with a coolant pump and controller to ensure facility coolant remains above the dew point temperature, facilitating efficient heat dissipation through an air-to-liquid heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air-cooling methods are used to cool high-powered modules, then the cooling system is simple to implement, but the cooling efficiency is insufficient and the heat load on air-conditioning systems increases
Solution Approach 1:
The patent transitions from air-cooling to liquid-cooling by introducing a coolant circulation system with pumps, heat exchangers, and coolant distribution units. The liquid coolant directly contacts or closely approaches the electronic components, enabling much higher heat transfer coefficients and cooling efficiency compared to air cooling, while maintaining system implementability through modular liquid cooling components.
2Productivity
If greater airflow rates are used to cool high-powered modules, then the cooling capacity increases, but the stress on room air-conditioning systems increases
Solution Approach 1:
The patent extracts the heat removal function from the room air-conditioning system by introducing a dedicated liquid cooling system at the rack or component level. The liquid coolant absorbs heat directly from the electronic components before the air reaches the air-conditioning system, thereby reducing the heat load on room air-conditioning equipment while maintaining high cooling capacity.
3Productivity
If liquid-cooling is implemented to manage higher heat fluxes, then the cooling efficiency increases, but the system complexity increases
Solution Approach 1:
The patent divides the liquid cooling system into modular segments including rack-level coolant distribution units, component-level heat exchangers, and distributed coolant loops. This segmentation allows the complex liquid cooling function to be implemented in manageable modules that can be independently installed, maintained, and scaled, reducing the perceived and actual system complexity.
4Productivity
If coolant temperature is reduced to increase cooling capacity, then the heat dissipation efficiency improves, but the risk of condensation and system reliability decreases
Solution Approach 1:
The patent implements temperature monitoring and control systems that continuously monitor coolant temperature, component temperature, and environmental conditions. The system dynamically adjusts coolant flow rates and temperatures to maintain optimal heat dissipation while preventing condensation by ensuring coolant temperature remains above the dew point, thereby maintaining system reliability.
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 effectively reduces the heat load on air-conditioning units, maintains uniform temperatures across electronics racks, and enhances cooling efficiency by recirculating coolant to maintain optimal temperature and flow rates, thereby improving data center performance and reliability.
Implementation Method 1
an air-to-liquid heat exchanger associated with the electronics rack for cooling air passing through the electronics rack
Implementation Method 2
The at least one coolant pump is associated with the at least one coolant recirculation conduit, and facilitates controlled recirculation of facility coolant
Data Source
AI summary
A cooling apparatus and method are provided. The cooling apparatus includes a coolant-cooled heat exchanger for facilitating dissipation of heat generated within an electronics rack, and a coolant control apparatus. The coolant control apparatus includes at least one coolant recirculation conduit coupled in fluid communication between a facility coolant supply and return, wherein the facility coolant supply and return facilitate providing facility coolant to the heat exchanger. The control apparatus further includes a coolant pump(s) associated with the recirculation conduit(s) and a controller which monitors a temperature of facility coolant supplied to the heat exchanger, and redirects facility coolant, via the coolant recirculation conduit(s) and coolant pump(s), from the facility coolant return to the facility coolant supply to, at least in part, ensure that facility coolant supplied to the heat exchanger remains above a dew point temperature.