Bypass Air Plenum for Downstream Component Cooling
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Solution Overview
Problem
In computer systems, the airflow used for heat removal becomes less effective as it passes through multiple heat-producing components, leading to suboptimal cooling, especially for downstream components which are often more sensitive and require efficient heat removal to prevent thermal damage.
Innovation Solution
The implementation of a bypass air plenum that directs a separate airflow, isolated from the inlet airflow, to mix with the heated inlet airflow downstream of upstream heat-producing components, enhancing the heat removal capacity and temperature reduction for downstream components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If airflow is directed through multiple heat-producing components in sequence, then upstream components are cooled effectively, but downstream components receive heated air with reduced heat removal capacity
Solution Approach 1:
The airflow path is segmented into multiple independent channels: a first airflow channel directs cool air through upstream heat-producing components, while a second airflow channel directs separate cool air through downstream heat-producing components. This segmentation ensures each component receives optimally cooled air independently, resolving the thermal management contradiction between upstream and downstream components.
2Device complexity
If a single airflow path is used through all components, then device complexity is minimized, but heat removal capacity decreases for downstream components
Solution Approach 1:
The air moving device is segmented into multiple independent air moving devices, each responsible for a specific airflow channel. This allows independent optimization of each channel's heat removal capacity without increasing overall system complexity, as each device operates autonomously to maintain optimal cooling for its designated components.
Solution Approach 2:
Each airflow channel is configured with local quality optimization: the first channel is tailored for upstream components with specific flow rates and directions, while the second channel is optimized for downstream components. This localized optimization ensures maximum heat removal efficiency at each position without compromising the entire system.
3Reliability
If excess airflow is provided to cool downstream components, then thermal damage risks are reduced, but airflow distribution efficiency decreases
Solution Approach 1:
By segmenting the airflow into separate channels with dedicated air moving devices, the system eliminates the need for excess airflow. Each channel receives precisely the amount of cool air needed for its components, optimizing airflow distribution efficiency while maintaining reliable thermal protection for all components.
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 configuration ensures that both upstream and downstream heat-producing components operate near their maximum operating temperatures, optimizing airflow distribution and minimizing thermal damage risks while reducing excess airflow, thus maximizing the number of components at optimal operating temperatures.
Implementation Method 1
directs a bypass airflow that is isolated from the inlet airflow to mix with the inlet airflow downstream of one or more upstream heat-producing components
Data Source
AI summary
A rack-mountable computer system enables an airflow that cools components in an upstream portion of the computer system interior to be cooled through mixing with a bypass airflow downstream of the components in the upstream portion. The mixed airflow can cool components in a downstream portion of the interior. The bypass airflow is directed by a bypass plenum that is unencompassed by the separate plenum that directs the airflow to cool the upstream portion components. The bypass plenum can be established by one surface of a component that supports one or more heat-producing components in the separate plenum, including an underside of a circuit board mounted in the interior. Relative flow rates through the separate plenums can be adjusted, via flow control elements, to separately control heat removal from components upstream and downstream of the air mixing, based at least in part upon air temperatures in the separate interior portions.