Hybrid Datacenter Cooling via Segmented Air and Liquid Zones
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Solution Overview
Problem
Datacenters with mixed rack power densities face challenges in cooling, as traditional air-cooling systems are inadequate for high rack power density racks, while liquid-cooling systems are costly and require significant installation and alterations to accommodate varying rack configurations, leading to inefficiencies and increased costs.
Innovation Solution
A hybrid cooling system that combines air-cooling and liquid-cooling units through a single coolant distribution line, allowing for dynamic capacity adjustments and shared components at the server/rack-level, reducing piping complexity and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional air-cooling systems are used, then installation is simple and cost is low, but cooling capacity is insufficient for high rack power density racks
Solution Approach 1:
The cooling system is segmented into multiple cooling zones corresponding to different rack power density areas. High power density racks receive liquid cooling while low power density racks receive air cooling, allowing each zone to be optimized independently for both installation simplicity and cooling capacity.
Solution Approach 2:
Different cooling methods are applied to different locations based on local heat generation characteristics. High power density racks are equipped with liquid cooling infrastructure while low power density racks use air cooling, matching the cooling solution to the local thermal load requirements.
2Reliability
If liquid-cooling systems are installed, then cooling capacity is sufficient for high rack power density racks, but installation complexity and cost increase significantly
Solution Approach 1:
The liquid cooling infrastructure is segmented and deployed only in zones requiring high cooling capacity. By dividing the datacenter into high and low power density zones, liquid cooling pipes and heat exchangers are installed only where necessary, reducing overall installation complexity while maintaining sufficient cooling capacity for high density racks.
Solution Approach 2:
Liquid cooling components are deployed locally only where high thermal loads require them, rather than throughout the entire facility. This localized deployment reduces the overall complexity of the liquid cooling system while ensuring adequate cooling capacity at high power density locations.
3Reliability
If liquid-cooling systems are installed, then cooling capacity is sufficient for high rack power density racks, but system cost increases significantly
Solution Approach 1:
The cooling system is segmented into liquid cooling zones for high power density racks and air cooling zones for low power density racks. This segmentation reduces the total quantity of liquid cooling components, pipes, and heat exchangers required, thereby reducing system cost while maintaining sufficient cooling capacity for high density areas.
Solution Approach 2:
Expensive liquid cooling infrastructure is deployed locally only where high thermal loads justify the cost. Low power density areas continue to use less expensive air cooling, reducing the overall quantity of expensive materials and components while ensuring adequate cooling capacity where needed.
4Reliability
If separate air-cooling and liquid-cooling systems are installed, then each system can be optimized for its function, but piping complexity and energy consumption increase
Solution Approach 1:
The air cooling and liquid cooling systems are merged into a unified hybrid cooling infrastructure with shared components. The coolant distribution line serves both air-cooled heat exchangers and liquid-cooled racks, and the chiller plant supports both cooling modes, reducing piping complexity and energy consumption while maintaining system optimization.
Solution Approach 2:
Key cooling infrastructure components are designed with multi-functionality to serve both air cooling and liquid cooling operations. The coolant distribution line, chiller plant, and control systems can dynamically allocate cooling capacity to either air-cooled or liquid-cooled zones based on real-time thermal demands, reducing overall system complexity while maintaining optimization.
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
The hybrid cooling system provides flexible and cost-effective cooling solutions by reducing installation complexity, energy consumption, and enabling dynamic capacity adjustments, effectively managing varying cooling loads without substantial mechanical or electrical system changes.
Implementation Method 1
a coolant distribution line including a first portion, a second portion, and a third portion that are in series fluid communication, wherein the air-cooling unit receives a supply of coolant from the chiller plant through the first portion of the coolant distribution line, wherein the coolant egressing the air-cooling unit is fed through the second portion to the liquid-cooling unit
Data Source
AI summary
Examples of hybrid cooling System for datacenters are disclosed. In an example, the hybrid cooling system includes a chiller plant to provide supply of coolant, an air-cooling unit (ACU), and a coolant distribution line. The coolant distribution line comprises a first portion, a second portion, and a third portion in series fluid communication. The ACU receives supply of the coolant from the chiller plant via the first portion. The hybrid cooling system further includes a coolant distribution unit (CDU) coupled to an electronic component in the data hall. The ACU and the CDU are in series fluid communication via the second portion of the coolant distribution line and the coolant egressing the ACU passes through the second portion to be fed back to the CDU. The hybrid cooling system includes a heat exchanger in series fluid communication with the CDU via the third portion of the coolant distribution line.