Server Chassis Ducting for Parallel Airflow Cooling
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Solution Overview
Problem
In information handling systems (IHSs), the serial configuration of heat dissipating components leads to thermal shadowing, where preheated air reduces cooling effectiveness for downstream components, necessitating an efficient cooling system to mitigate this issue.
Innovation Solution
A ducting structure within the server chassis separates cold and hot air plenums with air drops that direct cooling air in parallel to compute components, preventing preheating by separating the airflow paths and ensuring effective cooling of components aligned in series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If heat dissipating components are oriented in series to save space and simplify layout, then device complexity is reduced, but thermal shadowing occurs and cooling effectiveness deteriorates
Solution Approach 1:
The airflow path is segmented into multiple parallel channels using ducting structures, allowing each component to receive independent cooling airflow. This segmentation prevents thermal shadowing while maintaining the compact series layout of components.
Solution Approach 2:
The cooling system transitions from a single-dimensional series airflow path to a multi-dimensional parallel airflow structure. Ducting structures create vertical and lateral pathways that deliver cold air to each component simultaneously, effectively adding spatial dimensions to the cooling approach.
2Volume of moving object
If components are arranged in series configuration, then space utilization is improved, but downstream components receive preheated air and cooling performance decreases
Solution Approach 1:
The cooling system segments the airflow into multiple independent parallel streams, each delivering cold air directly to individual components. This prevents the cumulative heating effect that occurs in series configurations while maintaining compact space utilization.
Solution Approach 2:
Ducting structures act as intermediary elements that intercept and redirect cold airflow to each component before the air can be heated by upstream components. These ducts serve as mediators that preserve air temperature despite the series component arrangement.
3Device complexity
If a single airflow path is used to cool all components, then the cooling system structure is simplified, but thermal shadowing reduces cooling efficiency
Solution Approach 1:
The cooling system is segmented into multiple parallel airflow channels, each dedicated to specific components. This segmentation maintains relatively simple individual channel structures while collectively achieving high cooling efficiency through parallel operation.
Solution Approach 2:
Multiple parallel cooling channels are merged into a unified ducting structure that integrates seamlessly with the chassis. The combined structure appears simple externally while containing complex internal parallel pathways that eliminate thermal shadowing.
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 prevents thermal shadowing by ensuring that each compute component receives undisturbed cooling air, enhancing the overall cooling efficiency and reducing the temperature increase of downstream components.
Implementation Method 1
The ducting structure has a shroud that separates the cold air plenum and the hot air plenum
Implementation Method 2
The air drops direct cooling air supply in parallel through the shroud to corresponding compute components
Implementation Method 3
As air moves through one component absorbing heat, the increased temperature of the air reduces cooling effectiveness
Data Source
AI summary
An information handling system (IHS) has a server chassis assembly including a server chassis with a cold air inlet and a hot air exhaust and provisioned with compute components that are series aligned. A ducting structure positioned in the server chassis defines a cold air plenum in fluid communication with the cold air inlet and a hot air plenum in fluid communication with the hot air exhaust. A shroud of the ducting structure separates the cold air plenum and the hot air plenum. Air drops are provided longitudinally along the shroud corresponding respectively to the respective compute components being cooled. The air drops are each in fluid communication between the cold air plenum and the hot air plenum. Hot air from one compute component is routed directly to the hot air plenum away from other compute components.