Angled Card Cage for Front-to-Back Cooling Airflow
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Solution Overview
Problem
Existing cooling systems in telecommunications equipment face challenges with pressure head loss when implementing front-to-back airflow, particularly in space-constrained environments, as they require additional vertical rack height and result in reduced cooling air flow efficiency due to sharp turns and increased impedance.
Innovation Solution
An electronics enclosure with a card cage oriented at a non-orthogonal yaw angle, featuring a smaller cross-sectional plenum leading to the air inlet and a larger cross-sectional plenum leading to the air exhaust, along with strategically placed fans to minimize pressure losses and enhance airflow, allowing for a more efficient cooling air flow path from the front to the back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If front to back cooling airflow is implemented in standard card cages, then cooling effectiveness is improved, but pressure head loss increases due to sharp turns and increased impedance
Solution Approach 1:
The patent applies curved surfaces instead of sharp angles to guide airflow. Specifically, the intake and exhaust openings are positioned at angled orientations (e.g., 45 degrees) relative to the card cage faces, creating curved airflow paths that reduce turbulence and pressure losses compared to sharp 90-degree turns.
Solution Approach 2:
The patent introduces asymmetric positioning of intake and exhaust openings at different angles on the card cage structure. The non-uniform angular arrangement creates optimized airflow patterns that reduce overall pressure head loss while maintaining effective cooling.
2Temperature
If front to back cooling airflow is implemented, then cooling performance is improved, but additional vertical rack height is required
Solution Approach 1:
The patent reorients the cooling airflow from a vertical direction (requiring additional rack height) to a horizontal front-to-back direction. By positioning intake and exhaust openings on the front and rear faces of the card cage at specific angles, the airflow path is redirected along the horizontal dimension, eliminating the need for extra vertical space while maintaining cooling effectiveness.
3Ease of manufacture
If card cage is oriented with horizontal cards, then ease of installation is improved, but cooling airflow efficiency is reduced due to sharp turns
Solution Approach 1:
The patent uses angled openings (e.g., 45 degrees) on the card cage to create curved airflow paths that connect the horizontal card orientation with efficient cooling airflow. This angular configuration allows air to flow smoothly from the front intake through the horizontal cards to the rear exhaust without sharp 90-degree turns, maintaining both installation ease and cooling efficiency.
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 reduces pressure head loss by up to 10% and increases airflow rate by 28%, providing improved cooling effectiveness while maintaining a compact form factor, and also allows for a greater bending radius of cables, enhancing mechanical reliability and ease of maintenance.
Implementation Method 1
at least one fan operative to force air to flow along an airflow pathway that extends from the air inlet into the first plenum, through the card cage, into the second plenum, and out the air exhaust
Data Source
AI summary
An angled card cage for improved cooling airflow in front to back airflow products is disclosed. The angled card cage for improved cooling airflow includes a card cage having horizontally mounted circuit cards wherein the card cage is oriented at a non-orthogonal yaw angle relative to the front facing of an equipment rack. The angled card cage for improved cooling airflow provides advantages over systems known in the art by reducing pressure head losses incurred by the cooling air stream.