Drafted Air Duct for Optical Transceiver Cooling

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Solution Overview

Problem

Conventional cooling methods for high-power optical transceiver modules are inadequate in maintaining operating temperature requirements, leading to reliability and lifespan issues due to inefficient heat dissipation.

Innovation Solution

A drafted air duct system that fluidically couples internal convection cooling airflow with external airflow, enhancing velocity and heat dissipation by varying the cross-sectional area between intake and exhaust ports, and positioning the exhaust port near the chassis faceplate for improved airflow influence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional passive convection cooling or uniform air ducts are used, then the cooling system is simple in structure, but the heat dissipation efficiency is insufficient and cannot meet the operating temperature requirements of high-power optical transceivers

Engineering Contradiction:

Improveoperating temperatureVSAvoidcooling system structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The air duct is segmented into distinct sections with different cross-sectional areas - a narrower intake section and a wider exhaust section. This segmentation allows the cooling system to optimize airflow characteristics in different zones, creating velocity differentials that enhance convective heat transfer from the optical transceiver components without requiring complex active cooling mechanisms throughout the entire duct.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The air duct employs asymmetric geometry with non-uniform cross-sectional area along its length. The intake port area is deliberately made smaller than the exhaust port area, creating an asymmetric flow path that accelerates airflow through the cooling channel. This asymmetric design improves heat dissipation efficiency by increasing air velocity over the heated surfaces while maintaining structural simplicity.

Inventive Principle:

Principle #4Asymmetry

2Productivity

If the exhaust port is positioned far from the chassis faceplate, then the air duct structure is simpler, but the airflow velocity and heat dissipation efficiency are reduced

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidair duct length

Core Design Contradiction:

ProductivityVSLength of stationary object

Solution Approach 1:

The air duct is pre-configured with an optimized exhaust port position that is in sufficient spatial proximity to the chassis faceplate. This preliminary positioning ensures that high-velocity airflow is achieved at the critical exit region where heat dissipation is most effective, maximizing the cooling performance before the air leaves the duct system.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The air duct design applies local quality optimization by concentrating the exhaust port near the faceplate region where maximum cooling effect is needed. This localized positioning creates high-velocity airflow precisely where it can most effectively remove heat from the optical transceiver components, rather than distributing the exhaust uniformly along the entire duct length.

Inventive Principle:

Principle #3Local quality

3Speed

If uniform cross-sectional area air ducts are used, then the manufacturing process is simpler, but the airflow velocity is insufficient to enhance heat dissipation

Engineering Contradiction:

Improveairflow velocityVSAvoidair duct fabrication

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The air duct design changes the geometric parameter of cross-sectional area along its length, transitioning from a smaller intake area to a larger exhaust area. This parameter variation creates the desired airflow velocity profile for enhanced heat dissipation. The gradual change in cross-sectional area can be achieved through standard manufacturing techniques such as tapered shaping or stepped transitions, balancing performance improvement with manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

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 results in temperature reductions of 5 to 10 degrees Celsius and a two-fold increase in airflow velocity, effectively prolonging the reliability and lifespan of optical transceiver modules.

Implementation Method 1

internal convection cooling to influence an airflow in a passageway external thereof

Methodology Applied

Scientific EffectConvection cooling: Convection

Implementation Method 2

active convection cooling through a drafted air duct enhances the velocity of airflow

Methodology Applied

Scientific EffectForced convection: Forced Convection

Implementation Method 3

heatsink thermally coupled thereto

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250107033A1Apparatus and Method for Dissipating Heat from Electronics

Publication Date: 2025.03.27 INFINERA CORP

AI summary

Embodiments are provided for the design of a drafted air duct employed in a networking chassis to achieve sufficient airflow for electronics, such as optical transceiver pluggable modules, for efficient and effective cooling. Some embodiments help in forcing the airflow through an integrated heatsink of the electronics to improve its and networking equipment's thermal performance by providing an efficient cooling solution. Computational fluid dynamics (CFD) simulations may be used to custom design the performance of various air duct profiles and optimization of air duct design parameters, such as duct geometry, intake aperture cross-sectional area, and exhaust aperture cross-sectional area, to maximize cooling rate.