Heat Exchanger Door for Electronics Rack Cooling
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Solution Overview
Problem
The increasing power dissipation in integrated circuit chips poses a cooling challenge, as traditional air-cooling methods struggle to manage heat effectively in large server applications, leading to inefficient temperature distribution and recirculation of hot exhaust air, which can damage computer systems and limit air conditioning capabilities.
Innovation Solution
A heat exchanger door configured to couple with electronics racks at either the air inlet or outlet side, featuring an air-to-coolant heat exchanger with a heat exchanger core and casing, and a structural support forming a tubular door support beam, which extracts heat from airflow and reduces air-side pressure drop, allowing for enhanced heat removal without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air-cooling methods are used to cool high-powered modules, then airflow rates must be increased, but this leads to recirculation of hot exhaust air and inefficient temperature distribution
Solution Approach 1:
The invention extracts the heat exchanger function from traditional air-cooling systems by implementing a door-mounted air-to-liquid heat exchanger that captures hot exhaust air before it recirculates, separating the cooling function from the airflow path and eliminating hot air recirculation
Solution Approach 2:
The invention introduces liquid coolant as an intermediary medium between the hot exhaust air and the environment. The air-to-liquid heat exchanger transfers heat from the air stream to the liquid coolant, which then carries the heat away, preventing direct recirculation of hot air while maintaining efficient heat removal
2Productivity
If liquid-cooling is implemented to manage higher heat fluxes, then heat removal efficiency improves, but system complexity and infrastructure requirements increase
Solution Approach 1:
The door assembly serves multiple functions: it acts as both a structural closure for the electronics rack and as a mounting platform for the air-to-liquid heat exchanger. The tubular support beams provide both structural support and pathways for coolant flow, eliminating the need for separate mounting structures
Solution Approach 2:
The invention merges the door structure with the heat exchanger support function by integrating tubular support beams that serve both structural and fluid conduit purposes. The heat exchanger is directly mounted to the door assembly, combining thermal management with the rack's structural components
3Stability of the object's composition
If door structure is added to support heat exchanger, then heat exchanger stability improves, but airflow opening area is reduced
Solution Approach 1:
The invention moves the heat exchanger support structure from the airflow path dimension to the door assembly dimension. The tubular support beams are positioned at the periphery of the door, and the heat exchanger is mounted on the door surface, allowing the airflow opening to occupy the central area while maintaining structural support at the boundaries
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 solution effectively reduces the heat load on air-conditioning units, minimizes temperature differences across the air inlet side, and supports higher power-rack loads, reducing cooling costs and eliminating the need for hot and cold aisle containment, while maintaining low airflow impedance and energy efficiency.
Implementation Method 1
an air-to-coolant heat exchanger disposed so that airflow through the airflow opening passes across the air-to-coolant heat exchanger, the air-to-coolant heat exchanger to extract heat from airflow passing thereacross
Data Source
AI summary
A method is provided which includes providing a heat exchanger door that includes a door assembly spanning at least a portion of the air inlet or outlet side of an electronics rack. The door assembly includes an airflow opening which facilitates air ingress or egress of airflow through the electronics rack. The door assembly further includes an air-to-coolant heat exchanger and a structural support. The heat exchanger is disposed so that airflow through the airflow opening passes across the heat exchanger. The heat exchanger includes a heat exchanger core and a heat exchanger casing coupled to the core. The core includes at least one coolant-carrying channel which loops through the casing. The structural support is attached to the heat exchanger casing to define with the casing a tubular door support structure. The looping of the coolant-carrying channel(s) through the heat exchanger casing resides within the tubular door support structure.