Partial Bypass Cooling for Rack-Mountable Computer Systems
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Solution Overview
Problem
Computer systems in data centers face inefficiencies in heat removal due to airflow preheating, which reduces cooling capacity and affects component performance, especially when hot-pluggable components are mounted throughout the depth of the system, leading to suboptimal cooling configurations.
Innovation Solution
A computer system with partial bypass cooling uses a horizontal divider to separate the chassis into two levels, directing airflow to cool components differently on each level and mixing air flows downstream to enhance heat removal efficiency, thereby reducing temperature differences and improving cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hot-pluggable electronic components are mounted throughout the depth of the computer system interior, then component accessibility is improved, but cooling efficiency deteriorates due to preheating of cooling air
Solution Approach 1:
The patent divides the chassis interior into multiple levels (first level and second level) using a horizontal divider, creating separate airflow zones. This segmentation allows different components to be cooled by air at different temperatures, preventing preheating issues while maintaining component accessibility throughout the depth of the system.
Solution Approach 2:
The patent applies different quality airflows to different locations: cooler air is directed to heat-sensitive downstream components while warmer air (that has already cooled upstream components) is directed to less sensitive upstream components. This local differentiation optimizes cooling efficiency for each zone while maintaining overall system accessibility.
2Reliability
If airflow is directed through the entire interior including all heat-producing components, then comprehensive cooling is achieved, but temperature differences cause reduced heat removal capacity in downstream portions
Solution Approach 1:
The horizontal divider segments the airflow path into separate levels, allowing the system to comprehensively cool all components while preventing the temperature differential problem. Each level receives appropriately temperatured air, maintaining high heat removal capacity throughout the system.
Solution Approach 2:
The patent changes the temperature parameter of airflow by directing cooler air to downstream portions and warmer air to upstream portions. This parameter differentiation maintains optimal heat removal capacity across all components by matching air temperature to component heat sensitivity.
3Device complexity
If downstream heat-producing components are cooled by preheated air, then system simplicity is maintained, but component performance deteriorates due to reduced cooling capacity
Solution Approach 1:
The horizontal divider creates a relatively simple segmented structure that directs cool air to downstream components and warmer air to upstream components. This segmentation maintains system simplicity while dramatically improving component performance by eliminating the preheating problem.
Solution Approach 2:
The patent applies local quality by providing different air temperatures to different component zones. Downstream heat-sensitive components receive cooler air while upstream components receive warmer air, optimizing performance for each location without requiring complex external cooling systems.
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 increases the volumetric flow rate and reduces temperatures in air flowing to downstream components, enhancing heat removal capacity and maintaining optimal performance for both upstream and downstream heat-producing components.
Implementation Method 1
Heat may be removed from the heat-producing components via an airflow flowing through a computer system
Implementation Method 2
cooling systems, including air moving systems, may be used to induce airflow through one or more portions of a data center
Data Source
AI summary
A rack-mountable computer system includes a horizontal divider that divides a chassis interior of the computer system into a first level and a second level. One or more heat-producing components are mounted on the first level and a plurality of heat-producing components are mounted on the second level. The horizontal divider includes one or more openings that allow air flowing in the first level to mix with air flowing in the second level. Combined air including the air flowing in the second level and at least a portion of the air flowing in the first level cool a portion of the plurality of heat-producing components mounted in the second level downstream from the one or more openings in the horizontal divider.