Rack-Level Liquid Cooling for Data Center Energy Efficiency
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Solution Overview
Problem
Current data center cooling systems are inefficient in terms of energy consumption, as they often overcool facilities, especially when servers are not actively generating heat, leading to increased power usage and suboptimal cooling efficiency.
Innovation Solution
A multi-level distributed cooling control system that adjusts cooling at the server, intra-rack, inter-rack, and external levels by using liquid and air-cooled components, monitoring temperature conditions, and dynamically managing coolant flow to optimize cooling power consumption based on workload and ambient weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional facility air conditioning units are used to cool data centers, then cooling coverage is comprehensive, but energy consumption increases significantly
Solution Approach 1:
The patent segments the cooling system into rack-level liquid cooling units that can independently cool individual racks or groups of racks. Each rack cooling unit includes its own coolant circulation system with pumps, heat exchangers, and temperature sensors, allowing selective cooling only where heat is generated by active servers rather than cooling the entire facility uniformly.
Solution Approach 2:
The system implements local quality by providing different cooling approaches for different locations: liquid cooling for racks with high-density computing equipment that generates significant heat, and conventional air cooling for other areas. The rack-level control allows each rack to receive customized cooling based on its specific thermal load and operational requirements.
2Loss of energy
If liquid cooling solutions are implemented to transfer heat to water, then cooling efficiency improves, but system complexity increases
Solution Approach 1:
The liquid cooling system is segmented into modular rack-level units, each with independent coolant circulation loops. This modular approach allows the liquid cooling infrastructure to be deployed incrementally in specific racks rather than requiring facility-wide installation, reducing overall system complexity while maintaining high cooling efficiency where needed.
Solution Approach 2:
The patent uses liquid coolant as an intermediary substance to transfer heat from server components to external heat exchangers. The coolant circulates through channels in proximity to heat-generating components, absorbing thermal energy efficiently, then transports it to heat exchangers where the heat is transferred to air or water, decoupling the heat source from the heat dissipation mechanism.
3Temperature
If cooling is provided continuously to all racks, then temperature control is maintained, but power consumption increases when servers are not actively generating heat
Solution Approach 1:
The rack-level cooling units incorporate dynamic control mechanisms including temperature sensors, controllable pumps, and adjustable heat exchangers that respond to real-time thermal conditions. When servers are inactive and heat generation is low, the system reduces coolant flow rates or temporarily suspends cooling operations, adjusting the cooling capacity dynamically to match the actual thermal load.
Solution Approach 2:
The system implements feedback control through temperature sensors that continuously monitor rack temperatures and provide signals to the control logic. Based on this feedback, the system adjusts pump speeds, coolant flow distribution, and heat exchanger operation to maintain appropriate temperatures only when and where needed, eliminating unnecessary cooling power consumption during low-load periods.
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 approach reduces cooling power consumption by providing cooling only where needed, optimizing heat transfer rates, and adjusting cooling resources according to workload and environmental conditions, thereby enhancing overall energy efficiency in data centers.
Implementation Method 1
one or more liquid-to-liquid heat exchangers comprising valves configured to selectively transfer heat from liquid coolant in the inter-structure liquid cooling system to liquid coolant in the heat rejection system
Implementation Method 2
a heat rejection system comprising one or more heat rejection units configured to cool liquid coolant
Implementation Method 3
at least one air-to-liquid heat exchanger for each server, coupled to the intra-structure cooling system and configured to selectively provide low-temperature air to each server
Data Source
AI summary
Systems and methods for cooling include one or more computing structure, an inter-structure liquid cooling system that includes valves configured to selectively provide liquid coolant to the one or more computing structures; a heat rejection system that includes one or more heat rejection units configured to cool liquid coolant; and one or more liquid-to-liquid heat exchangers that include valves configured to selectively transfer heat from liquid coolant in the inter-structure liquid cooling system to liquid coolant in the heat rejection system. Each computing structure further includes one or more liquid-cooled servers; and an intra-structure liquid cooling system that has valves configured to selectively provide liquid coolant to the one or more liquid-cooled servers.