Variable-Conductivity Heat Exchanger for Electronic Hot Spots
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Solution Overview
Problem
Conventional heat exchangers with uniform geometries fail to efficiently manage spatially non-uniform heat generation, leading to local hot spots and inefficient thermal performance in high-power electronic systems, and existing manufacturing techniques limit the ability to create complex, spatially varying channel geometries and flow patterns.
Innovation Solution
The use of electrochemical additive manufacturing (ECAM) to fabricate heat exchangers with variable unit-area thermal conductivities by electrochemically depositing heat-exchanging extensions with varying geometries and materials, allowing for customizable cooling geometries that adapt to localized cooling demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional heat exchangers with uniform geometries are used, then manufacturing is simple, but thermal performance is inefficient due to inability to manage spatially non-uniform heat generation
Solution Approach 1:
The patent applies local quality by varying the geometry of heat-exchanging extensions (thickness, height, spacing, shape) across different zones of the heat exchanger to match spatially non-uniform heat generation patterns. This allows each local region to have optimized thermal conductivity for its specific heat load, improving overall thermal performance while managing hot spots effectively.
Solution Approach 2:
The patent changes geometric parameters (thickness, height, spacing, shape) and material properties of heat-exchanging extensions to achieve variable unit-area thermal conductivities across different portions of the heat-receiving surface. This enables adaptation to different thermal demands in various zones, resolving the contradiction between uniform manufacturing and non-uniform thermal performance.
2Manufacturing precision
If electrochemical additive manufacturing is used to create variable geometries, then thermal performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent replaces conventional mechanical manufacturing methods with electrochemical additive manufacturing (ECAM). This enables precise control over the geometry and distribution of heat-exchanging extensions, allowing complex spatially varying structures to be fabricated directly without traditional tooling or assembly steps, thus improving manufacturing precision for zone-specific thermal properties.
Solution Approach 2:
The ECAM process enables dynamic control of deposition parameters (current density, deposition time, electrolyte composition) to vary the geometry and material properties of heat-exchanging extensions during manufacturing. This resolves the contradiction by making complex geometries manufacturable through programmable parameter changes rather than mechanical operations.
3Productivity
If heat-exchanging extensions with varying geometries are used, then heat transfer efficiency improves, but device complexity increases
Solution Approach 1:
The patent implements local quality by designing heat-exchanging extensions with varying thickness, height, spacing, and shape in different zones to match local heat generation patterns. This optimizes heat transfer efficiency in each zone while managing the overall structural complexity through systematic geometric progression rather than random variation.
Solution Approach 2:
The patent utilizes multiple geometric dimensions (thickness, height, spacing) of heat-exchanging extensions to achieve variable thermal conductivities. By controlling variations across different spatial dimensions, the patent improves heat transfer efficiency while maintaining a relatively simple base structure that can be manufactured using ECAM.
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 enhances convective heat transfer, improves coolant distribution, and reduces thermal resistance, providing efficient heat extraction with fine-resolution, adaptable cooling structures.
Implementation Method 1
a base comprising a heat-receiving surface for thermal coupling to the heat-transferring surface
Implementation Method 2
the heat transfer fluid directly interfaces the heat-exchanging surfaces while circulating through the heat exchanger
Implementation Method 3
a heat-exchanging portion electrochemically deposited on and attached to the base
Data Source
AI summary
A heat exchanger with a heat-exchanging portion is electrochemically deposited onto a base (for thermal coupling to a heat source) or directly on the heat source. The heat-exchanging portion comprises extensions that define openings (e.g., channels) for passing heat transfer fluid through the heat exchanger. The geometry of these c and/or openings varies throughout the exchange to achieve different unit-area thermal conductivities for at least two different portions of the heat-receiving surface. For example, the thickness, height, spacing, shape, and/or materials of the heat-exchanging extensions may be selected to achieve the desired heat transfer at each zone. This variability in unit-area thermal conductivities may be used to accommodate for “hot spots”, heating of the heat transfer fluid, fluid dynamics, and other factors associated with the heat exchanger operation. Electrochemical additive manufacturing (ECAM) is used to fabricate at least heat-exchanging extensions thereby enabling precise and zone-specific thermal transfer characteristics.