Autonomous Rack Cooling Layout Using Cascaded Air and Liquid Loops
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Solution Overview
Problem
Existing cooling technologies for autonomous racks are inadequate in environments lacking liquid cooling infrastructure, and there is a need for improved cooling solutions that optimize both air and liquid cooling for diverse thermal requirements of electronic components.
Innovation Solution
A dual cooling arrangement is implemented, comprising a front-mounted air-to-liquid heat exchanger for low-temperature components and a rear-mounted heat exchanger for high-temperature components, with closed and open loops for liquid and air cooling, respectively, using pumps to manage fluid flow and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid cooling loops are implemented in autonomous racks, then cooling performance is improved, but device complexity increases due to the need for self-contained cooling systems in environments lacking liquid cooling infrastructure
Solution Approach 1:
The cooling system is segmented into two independent loops: a liquid cooling loop for high-performance cooling of sensitive components, and an air cooling loop for general ventilation and cooling of less sensitive components. This segmentation allows the liquid cooling system to be self-contained and autonomous while the air cooling system provides supplementary support, resolving the contradiction between achieving high cooling performance and managing system complexity.
Solution Approach 2:
The air-to-liquid heat exchanger serves multiple functions: it cools the liquid cooling loop by exchanging heat with ambient air, and simultaneously serves as an air cooling device for the air-cooled electronic components. This multi-functionality reduces the need for separate cooling devices, thereby reducing overall device complexity while maintaining high cooling performance.
2Productivity
If both air-cooled and liquid-cooled components are housed in the same rack, then server density is improved, but thermal management difficulty increases due to diverse thermal requirements
Solution Approach 1:
Different cooling methods are applied to different components based on their thermal requirements: liquid cooling is applied to high-heat-generation components requiring intensive cooling, while air cooling is applied to components with lower thermal requirements. This local differentiation allows high server density while managing thermal management complexity through targeted cooling strategies.
Solution Approach 2:
The cooling system is segmented into two independent loops: a liquid cooling loop for high-performance cooling of sensitive components, and an air cooling loop for general ventilation and cooling of less sensitive components. This segmentation allows the liquid cooling system to be self-contained and autonomous while the air cooling system provides supplementary support, resolving the contradiction between achieving high cooling performance and managing system complexity.
3Device complexity
If a single cooling system is used for all components, then device complexity is reduced, but cooling performance deteriorates due to inability to meet diverse thermal requirements
Solution Approach 1:
The cooling system is segmented into two independent loops: a liquid cooling loop for high-performance cooling of sensitive components, and an air cooling loop for general ventilation and cooling of less sensitive components. This segmentation allows the liquid cooling system to be self-contained and autonomous while the air cooling system provides supplementary support, resolving the contradiction between achieving high cooling performance and managing system complexity.
Solution Approach 2:
The air-to-liquid heat exchanger serves multiple functions: it cools the liquid cooling loop by exchanging heat with ambient air, and simultaneously serves as an air cooling device for the air-cooled electronic components. This multi-functionality reduces the need for separate cooling devices, thereby reducing overall device complexity while maintaining high cooling performance.
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 configuration optimizes cooling performance by maintaining optimal temperatures for both types of components, reduces energy consumption, and allows for higher server density in data centers.
Implementation Method 1
a first air-to-liquid heat exchanger mounted to the front side of the first rack structure and configured to pull in cold ambient air towards the first set of rack-mounted processing assemblies
Implementation Method 2
at least one liquid cooling unit thermally mounted onto the at least one liquid-cooled heat-generating electronic component of the first set of processing assemblies and fluidly-coupled to the circulation conduit to internally channel the cooling liquid therethrough
Implementation Method 3
at least one first pump to forcibly urge the flow of the cooling liquid through the forward path, the liquid cooling unit, the return path, and the first air-to-liquid heat exchanger
Data Source
AI summary
Autonomous rack system configurations for datacenter operations are presented that include a combination of a first rack structure incorporating front-mounted heat exchanger and a second rack structure incorporating a rear-mounted heat exchanger, such that liquid-cooled heat-generating electronic components that are less tolerant to higher temperatures are disposed within the first rack structure and liquid-cooled heat-generating electronic components that are more tolerant to higher temperatures are disposed within the second rack structure. These configurations utilize the residual air flow that passes through the less temperature tolerant electronic components of the first rack structure and redirect it to the second rack structure to cool the more temperature tolerant electronic components of the second rack structure.