Passive Cooling System Using Anisotropic Graphite Layers
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Solution Overview
Problem
Electronic devices face challenges in managing thermal loads due to increased power consumption, particularly in portable devices where size and weight constraints limit the use of traditional metal heat sinks and active cooling mechanisms like fans.
Innovation Solution
A compact, passive cooling system featuring a 3-dimensional housing with three layers, including a second layer with anisotropic thermal conductivity, and a plate with anisotropic thermal conductivity material, such as graphite, to enclose the power source and dissipate heat without external active cooling or heavy components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional metal heat sinks are used to manage thermal load, then cooling effectiveness is improved, but weight and size increase
Solution Approach 1:
The patent employs a composite structure consisting of three layers: metal layers (first and third layers) providing mechanical strength and thermal conductivity, and a graphite layer (second layer) providing anisotropic thermal conductivity. This composite approach achieves effective heat dissipation while reducing overall weight compared to traditional solid metal heat sinks.
Solution Approach 2:
The patent applies anisotropic thermal conductivity properties to the graphite layer, which has different thermal conductivity in different directions. The graphite layer is positioned specifically between the metal layers to optimize heat flow paths, allowing effective thermal management with minimal material usage and reduced weight.
2Temperature
If active cooling mechanisms like fans are used, then cooling effectiveness is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent designs a passive cooling system that utilizes natural heat conduction and dissipation mechanisms. The anisotropic graphite layer naturally guides heat flow from the power source through the composite structure without requiring external active cooling components, thereby reducing device complexity and eliminating the need for additional power consumption.
3Volume of moving object
If compact cooling design is implemented, then device size is reduced, but cooling effectiveness may deteriorate
Solution Approach 1:
The patent utilizes the anisotropic property of graphite, which has different thermal conductivity in different spatial dimensions. The graphite layer is oriented and positioned to optimize heat flow paths in the vertical dimension (between metal layers), achieving effective heat dissipation within a compact three-dimensional structure without requiring large horizontal space.
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
The system effectively maintains operational temperatures below predetermined values, reducing external and internal temperatures while being lightweight and compact, suitable for portable devices with size and battery-life constraints.
Implementation Method 1
This second layer has a first anisotropic thermal conductivity. Furthermore, the plate includes a material having a second anisotropic thermal conductivity. In some embodiments, the second layer includes graphite and the plate includes graphite.
Implementation Method 2
the heat-shield mechanism provides passive cooling of the power source
Data Source
AI summary
A system includes a power source and a heat-shield mechanism which encloses the power source. This heat-shield mechanism includes a 3-dimensional housing that defines a cavity in which the power source resides, and a plate that is positioned to cover an opening to the cavity that is defined by an edge of the housing. Note that the housing contains three layers in which a second layer is sandwiched between a first layer and a third layer. This second layer has a first anisotropic thermal conductivity. Furthermore, the plate includes a material having a second anisotropic thermal conductivity.