Liquid-Assisted Air Cooling for Electronic Racks
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Solution Overview
Problem
Conventional data center cooling systems, such as CRACs, face inefficiencies and maintenance challenges, particularly in modular configurations, where liquid leakage can damage IT components and are not effective in managing increasing heat loads from growing numbers of servers.
Innovation Solution
A liquid-assisted cooling system for electronic racks, featuring modular fan and heat exchange units that utilize a chiller system to circulate cooling liquid through heat exchange tubes, allowing efficient heat transfer and independent module installation and removal for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat exchangers are disposed on the top of electronic racks, then cooling efficiency is improved, but maintenance problems such as liquid leakage occur which may damage IT components
Solution Approach 1:
The system divides the cooling function into separate modular components: air cooling units with fans and liquid cooling units with heat exchangers. These modular units can be independently installed, removed, and maintained. The liquid cooling units are positioned at the rear of racks rather than on top, separating the liquid handling function from the IT equipment area to reduce leakage risk to components.
Solution Approach 2:
The patent introduces an intermediary liquid cooling mechanism that uses chilled liquid circulating through tubes in the heat exchanger units. This liquid acts as a heat transfer medium between the air cooling fans and the rack components, enabling efficient cooling while keeping the liquid contained in sealed modular units away from IT equipment.
2Productivity
If the number of servers within a data center increases, then computing capacity is improved, but power consumption for cooling increases commensurately
Solution Approach 1:
The system merges air cooling and liquid cooling mechanisms into integrated modular units that can be deployed at the rack level. Each modular unit combines fans for air circulation with heat exchangers containing chilled liquid tubes, creating a hybrid cooling system that efficiently handles heat loads from increasing server densities without proportionally increasing power consumption.
Solution Approach 2:
The patent implements localized cooling at each rack or server level rather than using centralized CRAC units. Each modular cooling unit is tailored to the specific heat load of its associated IT equipment, providing efficient cooling only where needed. This localized approach reduces overall power consumption by eliminating the inefficiencies of cooling entire data center environments.
3Temperature
If conventional CRAC systems are used to cool returning air, then cooling coverage is improved, but system complexity and maintenance difficulty increase
Solution Approach 1:
The system segments the centralized CRAC cooling approach into distributed modular cooling units at each rack level. Each modular unit is a self-contained system with its own fans and heat exchangers, simplifying the overall architecture by eliminating complex centralized air handling systems while maintaining comprehensive cooling coverage across all racks.
Solution Approach 2:
The modular cooling units are designed for easy self-maintenance and replacement. Each unit can be independently removed and replaced without affecting other racks or requiring complex system shutdowns. The sealed modular design allows for simple maintenance of fans and heat exchangers without requiring specialized service personnel or complex disassembly procedures.
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 enhances cooling efficiency, reduces maintenance issues, and optimizes power usage by allowing individual control of airflow and liquid flow rates, effectively managing heat generated by IT components in data centers.
Implementation Method 1
The one or more tubes allow a cool liquid to travel therein to exchange the heat carried by the air flow
Implementation Method 2
circulate cooling liquid through heat exchange tubes, allowing efficient heat transfer
Implementation Method 3
The fan unit generates an air flow flowing from the frontend to the backend past through an air space of the stack of IT component
Data Source
AI summary
An electronic rack includes a stack of one or more information technology (IT) components disposed therein to form a frontend and a backend of the electronic rack. The electronic rack further includes a fan unit detachably mounted on the backend of the electronic rack. The fan unit generates an air flow flowing from the frontend to the backend past through an air space of the stack of IT components to reduce a temperature of the IT components. The electronic rack further includes a heat exchange unit detachably mounted on the backend of the electronic rack to exchange heat generated from the IT components. The heat exchange unit includes one or more tubes forming a heat exchange screen. The one or more tubes allow a cool liquid to travel therein to exchange the heat carried by the air flow past through the heat exchange screen.