Multi-Rack Cooling with Shared Air-to-Liquid Heat Exchanger
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Solution Overview
Problem
The increasing power dissipation in integrated circuit chips poses a cooling challenge, particularly in data centers where traditional air-cooling methods are insufficient, leading to temperature inefficiencies and strain on air-conditioning systems, especially in large server farms.
Innovation Solution
A multi-rack assembly is introduced, comprising an air-to-liquid heat exchanger coupled with a coolant loop and a cooling unit, along with an airflow director, to facilitate the transfer of heat from air to coolant, thereby reducing the heat load on air-conditioning units and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air-cooling methods are used to cool integrated circuit chips, then the cooling system is simple and easy to implement, but the cooling efficiency is insufficient and temperature control is ineffective
Solution Approach 1:
The patent combines air-cooling and liquid-cooling systems into a hybrid cooling apparatus. The liquid cooling component (cold plate) is integrated with the air cooling component (heat sink and fan), allowing both cooling methods to work together. The liquid cooling handles high-heat-generation components while air cooling manages lower-heat components, achieving effective temperature control that neither system could achieve alone.
Solution Approach 2:
The cooling system is segmented into different cooling zones with distinct cooling methods. High-power components (CPUs, GPUs) are directed to liquid cooling cold plates, while lower-power components use air cooling heat sinks. This segmentation allows optimized cooling for each component type, improving overall temperature control efficiency.
2Productivity
If airflow rate is increased to cool high-powered modules, then cooling efficiency improves, but the heat load on air-conditioning systems increases
Solution Approach 1:
The patent extracts heat from the air stream before it reaches the air-conditioning system using liquid-to-air heat exchangers. The liquid cooling circuit captures thermal energy from the air that has passed over heated components, transferring it to liquid coolant. This removes the heat load from the air-conditioning system while maintaining effective cooling of high-powered modules.
Solution Approach 2:
The liquid coolant acts as an intermediary between the air cooling system and the final heat dissipation. It absorbs heat from the air stream via heat exchangers and transports it to be dissipated separately, reducing the thermal burden on air-conditioning systems while preserving the benefits of high airflow cooling.
3Productivity
If liquid-cooling is used to manage higher heat fluxes, then cooling efficiency is high, but the system complexity increases
Solution Approach 1:
The patent applies liquid cooling only to specific high-heat-generation components rather than the entire system. Cold plates are strategically placed on CPUs, GPUs, and other high-power components, while lower-power components continue to use simpler air cooling. This localized approach achieves high heat flux management where needed while minimizing overall system complexity.
Solution Approach 2:
The cooling apparatus is designed to serve multiple functions: liquid-to-air heat exchangers both cool the air stream and transfer heat to the liquid coolant for separate dissipation. The system can adapt to different component configurations and power levels, providing a versatile solution that balances performance and complexity across various computing system configurations.
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 extracts heat from air passing through electronics racks, reducing the temperature and the load on air-conditioning systems, allowing for more efficient cooling and improved reliability of data center operations.
Implementation Method 1
The air-to-liquid heat exchanger is associated with the first electronics rack for cooling at least a portion of air passing through the first electronics rack, and is disposed at one of the air inlet side or the air outlet side of the first electronics rack. The heat exchanger, which is coupled in fluid communication with a coolant loop to receive coolant therefrom and exhaust coolant thereto, transfers heat from air passing thereacross to coolant passing therethrough.
Implementation Method 2
The at least one cooling unit is associated with the first electronics rack and cools coolant in the coolant loop to, at least in part, facilitate extraction of heat by the air-to-liquid heat exchanger from the air passing thereacross.
Data Source
AI summary
A multi-rack assembly is provided which includes adjacent first and second electronics racks, each being at least partially air-cooled, and an air-to-liquid heat exchanger associated with the first rack for cooling at least a portion of air passing through the first rack. The heat exchanger, which is disposed at the air inlet or air outlet side of the first rack and is coupled in fluid communication with a coolant loop to receive coolant from the loop and exhaust coolant to the loop, transfers heat from air passing thereacross to coolant passing therethrough. The assembly also includes a cooling unit, associated with the first rack and cooling coolant in the coolant loop, and an airflow director associated with the second rack and facilitating ducting at least a portion of air passing through the second rack to also pass across the heat exchanger associated with the first rack.