Thermoelectric Liquid Cooling for High-Power Electronics Racks
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Solution Overview
Problem
The increasing power dissipation of integrated circuit chips poses a cooling challenge in data centers, as traditional air-cooling methods become inadequate due to rising airflow requirements, necessitating more efficient heat removal solutions for electronic components.
Innovation Solution
A liquid-cooled cooling system is implemented, incorporating a coolant loop with a thermoelectric array and a liquid-to-air heat exchanger, where the thermoelectric array transfers heat between two loop portions, and the liquid-to-air heat exchanger dissipates heat from the coolant to air, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air-cooling methods are used to cool electronic components, then the system structure is simple and ease of manufacture is good, but as power dissipation increases, the cooling effectiveness deteriorates and higher airflow rates are needed which become difficult to manage efficiently
Solution Approach 1:
The patent introduces liquid coolant as an intermediary substance to transfer heat from electronic components through a coolant loop to a heat exchanger, replacing direct air-cooling. This mediator enables efficient heat removal from high-power components without requiring high airflow rates, thus maintaining cooling effectiveness while simplifying the overall system structure compared to complex high-velocity air cooling systems.
Solution Approach 2:
The patent employs a liquid cooling system using hydraulic principles, where coolant circulates through channels in contact with electronic components, absorbs heat, and transports it to a heat exchanger. This hydraulic approach provides superior cooling capacity compared to pneumatic (air) cooling, enabling effective heat dissipation from high-power density components without the need for high airflow rates.
2Reliability
If higher airflow rates are used to cool higher power modules, then the cooling effectiveness is improved, but the system complexity increases and it becomes difficult to manage at the rack level
Solution Approach 1:
The liquid coolant serves as an intermediary that efficiently captures heat at the component level through direct contact with cold plates, then transports it away from the electronics rack. This separates the heat removal function from the heat rejection function, allowing simple passive or low-power active cooling at the rack level while maintaining high cooling effectiveness at the component level.
Solution Approach 2:
The cooling system is segmented into distinct functional modules: cold plates attached to individual components or component groups, a circulating coolant loop, and a centralized heat exchanger. This segmentation allows each module to be optimized independently and simplifies installation, maintenance, and scalability at the rack level compared to unified high-airflow cooling systems.
3Device complexity
If traditional air-cooling is used, then the device complexity is low, but the cooling capacity is insufficient for high power dissipation
Solution Approach 1:
The patent transitions from pneumatic (air) cooling to hydraulic (liquid) cooling, exploiting the superior heat capacity and thermal conductivity of liquids. The circulating coolant absorbs heat directly from components through thermal contact, providing high cooling capacity that scales with flow rate without the diminishing returns encountered in air-cooling systems. This hydraulic approach delivers the necessary power-level cooling capacity while keeping device complexity relatively low.
Solution Approach 2:
The liquid coolant acts as an intermediary heat transfer medium that bridges the thermal gap between electronic components and the external environment. This intermediary enables efficient heat extraction at the component level and flexible heat rejection at the rack level, providing high cooling capacity without requiring complex high-velocity airflow systems or large heat exchanger surfaces.
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 manages heat dissipation from high-power electronic components, maintaining optimal temperatures and improving reliability by leveraging the superior heat removal capabilities of liquid cooling systems while minimizing the limitations of air-cooling methods.
Implementation Method 1
the thermoelectric array operates to transfer heat from coolant passing through the first loop portion of the coolant loop to coolant passing through the second loop portion of the coolant loop
Implementation Method 2
The liquid-to-air heat exchanger cools coolant passing therethrough by dissipating heat from the coolant to air passing thereacross
Data Source
AI summary
Thermoelectric-enhanced, liquid-cooling apparatus and method are provided for facilitating cooling of one or more components of an electronics rack. The apparatus includes a liquid-cooled structure in thermal communication with the component(s) to be cooled, and a liquid-to-air heat exchanger coupled in fluid communication with the liquid-cooled structure via a coolant loop for receiving coolant from and supply coolant to the liquid-cooled structure. A thermoelectric array is disposed with first and second coolant loop portions in thermal contact with first and second sides of the array. The thermoelectric array operates to transfer heat from coolant passing through the first loop portion to coolant passing through the second loop portion, and cools coolant passing through the first loop portion before the coolant passes through the liquid-cooled structure. Coolant passing through the first and second loop portions passes through the liquid-to-air heat exchanger for cooling thereof.