Graduated Heatpipe Condenser for Lower Thermal Resistance
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Solution Overview
Problem
Existing heatpipes in information handling systems often suffer from inefficient heat transfer due to variations in cross-section area and wick thickness, leading to suboptimal cooling performance and increased material usage.
Innovation Solution
A heatpipe design with a graduated condenser portion featuring a constant ratio between wick thickness and cross-section area, maintaining a consistent ratio throughout its length, which is achieved by forming a tube with a non-constant longitudinal profile using a stepped or tapered configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the condenser portion has a constant cross-section area, then the manufacturing process is simpler, but the heat transfer efficiency is reduced due to thermal resistance variations
Solution Approach 1:
The condenser portion is divided into multiple sections with different cross-sectional areas, where each section has optimized dimensions matching the local heat dissipation requirements. The sections closest to the heat source have larger cross-sectional areas for higher heat flux, while distal sections have smaller areas, creating a graduated profile that optimizes heat transfer efficiency throughout the condenser length.
2Reliability
If the wick thickness is increased throughout, then the capillary action is improved, but the material usage and weight increase
Solution Approach 1:
The wick thickness is varied along the length of the condenser, with thicker wick sections positioned where higher capillary action is needed (typically in sections with smaller cross-sectional areas or higher heat flux), and thinner wick sections where less capillary action is required. This graduated wick configuration optimizes fluid return performance while minimizing overall material usage.
3Strength
If the tube thickness is increased, then the structural strength is improved, but the heat transfer efficiency decreases due to increased thermal resistance
Solution Approach 1:
The tube thickness is optimized for each section based on the local mechanical and thermal requirements. Sections with larger cross-sectional areas may have different wall thicknesses compared to sections with smaller areas, allowing the structure to maintain sufficient strength while minimizing thermal resistance in the heat transfer path.
4Reliability
If the condenser portion is made longer, then the heat dissipation capacity is improved, but the device length and material usage increase
Solution Approach 1:
Instead of simply extending the condenser length, the invention optimizes the cross-sectional area parameter along the length, creating a graduated profile that maximizes heat dissipation capacity within a compact length. The varying cross-sectional areas allow more heat to be dissipated in shorter distances by optimizing the heat transfer surface area distribution.
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 design enhances heat transfer efficiency, reduces thermal resistance, allows for more fins and airflow, and minimizes material usage, resulting in improved cooling performance and reduced manufacturing costs.
Implementation Method 1
a working fluid inside the tube
Implementation Method 2
an evaporator portion coupled to the heat source
Implementation Method 3
a condenser portion coupled to the heat exchanger
Implementation Method 4
a wick inside the tube, the wick having a wick thickness
Data Source
AI summary
In one or more embodiments, one or more systems may comprise a heatpipe with a ratio between a cross-section area for a working fluid and one or more of a tube thickness and a wick thickness that is substantially constant along the length of the heatpipe. A heatpipe may have an evaporator section having a constant longitudinal profile and a condenser portion with a non-constant longitudinal profile. A wick inside the heatpipe may have a thickness based on a position in the heatpipe. The condenser portion may comprise a plurality of sections, with each section having a constant longitudinal profile.