Multi-rack Door Heat Exchanger for Server Cooling
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Solution Overview
Problem
The increasing power dissipation in integrated circuit chips poses a cooling challenge, particularly in large server applications where traditional air-cooling methods are inadequate, leading to inefficient heat management and recirculation of hot exhaust air, which can detrimental to system performance and reliability.
Innovation Solution
An air-cooling apparatus that secures multiple electronics racks in a fixed relation and incorporates a multi-rack door with an air-to-liquid heat exchanger, ensuring that airflow across the heat exchanger extracts heat from both the inlet and outlet sides of the racks, utilizing adjustable ducting to ensure all airflow passes through the heat exchanger, thereby enhancing heat removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air-cooling methods are used for high-powered modules, then the system structure remains simple, but the cooling efficiency is insufficient and hot exhaust air recirculation occurs
Solution Approach 1:
The patent combines multiple racks into a single integrated cooling unit with a common heat exchanger. The door assembly spans across multiple racks and incorporates a shared air-to-liquid heat exchanger that cools airflow from all racks simultaneously, merging previously separate cooling systems into one unified structure.
Solution Approach 2:
The patent introduces a liquid cooling intermediary system as a mediator between the air-cooled racks and the final heat dissipation. The air-to-liquid heat exchanger transfers heat from the rack airflow to a liquid coolant, which then carries the heat away, preventing direct recirculation of hot air.
2Productivity
If greater airflow is provided through more powerful air-moving devices, then the cooling capacity increases, but the energy consumption and device complexity increase
Solution Approach 1:
The patent replaces part of the mechanical air-moving system with a thermal exchange system. Instead of relying solely on increased airflow from powerful fans, the system uses an air-to-liquid heat exchanger to transfer heat directly, reducing the burden on air-moving devices and lowering their energy consumption.
Solution Approach 2:
The patent introduces a hydraulic cooling system using liquid coolant to transport heat away from the racks. The air-to-liquid heat exchanger transfers thermal energy to the liquid medium, which then carries the heat to external heat dissipation equipment, utilizing hydraulic principles for efficient heat removal.
3Reliability
If liquid-cooling is implemented to manage higher heat fluxes, then the heat removal efficiency improves, but the device complexity and infrastructure investment increase
Solution Approach 1:
The patent segments the liquid cooling system into modular door assemblies that can be attached to individual rack groups. Each door assembly contains its own air-to-liquid heat exchanger, allowing the liquid cooling capability to be distributed and modular rather than requiring a monolithic complex system.
Solution Approach 2:
The patent creates a multi-functional door assembly that serves both as a physical enclosure for the racks and as a housing for the air-to-liquid heat exchanger. The door structure performs multiple functions: containing equipment, providing structural support, and facilitating thermal exchange, thereby reducing overall system complexity.
4Ease of operation
If traditional air-cooling with parallel airflow paths is used, then the system is easy to operate, but the heat load on air-conditioning units increases
Solution Approach 1:
The patent extracts the heat load from the general air-conditioning system by introducing dedicated air-to-liquid heat exchangers at the rack level. The heat is removed directly at the source and transferred to liquid coolant, taking the thermal burden out of the centralized air-conditioning system and reducing its energy consumption.
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 reduces the heat load on air-conditioning units, improves cooling efficiency, and allows for a more uniform temperature distribution across the air inlet side of the racks, enhancing the reliability and performance of the computer system while reducing the capital investment in cooling infrastructure.
Implementation Method 1
The air-to-liquid heat exchanger extracts heat from the air passing thereacross
Data Source
AI summary
An air-cooling apparatus is provided which includes a securing mechanism for holding two or more separate electronics racks in fixed relation adjacent to each other, and a multi-rack door sized and configured to span the air inlet or air outlet sides of the racks. The securing mechanism holds the electronics racks in fixed relation with their air inlet sides facing a first direction, and air outlet sides facing a second direction. The door includes a door frame with an airflow opening. The airflow opening facilitates the ingress or egress of airflow through the electronics racks, and the door further includes an air-to-liquid heat exchanger supported by the door frame, and disposed so that air flowing through the airflow opening passes across the heat exchanger. In operation, the heat exchanger extracts heat from the air passing through the separate electronics racks.