Composite Chassis for IHS Surface Temperature Control
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Solution Overview
Problem
As information handling systems (IHS) become thinner and more powerful, they face issues with heat 'hot spots' on their outer surfaces, which can be uncomfortable for users and limit the thinness of the chassis, requiring undesirable trade-offs between thickness and performance to prevent overheating.
Innovation Solution
A composite chassis design featuring a first layer with an oxidized surface and a second layer of carbide-based composite material, which provides high thermal conductivity in directions parallel to the surface while restricting heat flow perpendicular to the surface, effectively diffusing heat away from the outer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of IHS chassis is reduced to achieve ultrathin design, then the weight and dimensions of the IHS are reduced, but heat hot spots develop on the outer surface making it uncomfortable for users
Solution Approach 1:
The chassis base is segmented into multiple layers with different thermal conductivity characteristics. The first layer (outer) has lower thermal conductivity to block heat transfer to the outer surface, while the second layer (inner) has higher thermal conductivity to spread heat laterally, creating a segmented thermal management structure that resolves the contradiction between thinness and surface temperature control
Solution Approach 2:
Different regions of the chassis base are assigned different thermal properties through the layered structure. The inner layer provides high lateral thermal conductivity specifically at the heat source region to diffuse hot spots, while the outer layer provides low thermal conductivity to prevent heat reaching the outer surface, creating localized thermal quality variations that address the temperature-thickness contradiction
2Length of moving object
If the thickness of IHS chassis is reduced to achieve ultrathin design, then the weight and dimensions of the IHS are reduced, but the heat dissipation capability is compromised
Solution Approach 1:
The patent transitions from one-dimensional heat transfer (direct path from component to outer surface) to two-dimensional heat transfer by incorporating lateral heat spreading in the second layer. This dimensional change allows heat to dissipate across a larger area within the chassis plane, improving heat dissipation efficiency without increasing chassis thickness
3Ease of manufacture
If traditional single-layer chassis design is used, then the manufacturing is simpler, but the thermal management performance is insufficient to prevent hot spots
Solution Approach 1:
The chassis base employs a composite structure combining two different materials with complementary thermal properties. The first layer material provides thermal insulation to protect the outer surface, while the second layer material provides thermal conduction to spread heat laterally, creating a composite material system that achieves superior thermal management compared to single-layer designs
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 prevents 'hot spots' on the outer surface by quickly spreading heat within the chassis, maintaining the thinness of the IHS while ensuring effective heat dissipation, thus enhancing user comfort and performance.
Implementation Method 1
the second layer includes a carbide-based composite material and that provides a thermal conductivity of less than 1 watt per meter-kelvin in a direction that is generally perpendicular to the outer surface of the chassis base, while providing a thermal conductivity of at least 100 W/mK in directions that are generally parallel to the outer surface of the chassis base
Implementation Method 2
a first layer of the chassis base that provides the outer surface of the chassis base, wherein the first layer includes an first layer oxidized surface located opposite the first layer from the outer surface of the chassis base
Data Source
AI summary
An IHS chassis defines an IHS housing that houses a plurality of IHS components. The IHS chassis includes an outer surface located opposite the IHS chassis from the IHS housing. A first layer of the IHS chassis provides the outer surface of the IHS chassis. The first layer includes a first layer oxidized surface located opposite the first layer from the outer surface of the chassis base. A second layer of the chassis base is located immediately adjacent the IHS housing. The second layer includes a carbide-based composite material that provides a thermal conductivity of less than 1 watt per meter-kelvin in a direction that is generally perpendicular to the outer surface of the IHS chassis, while providing a thermal conductivity of at least 100 W/mK in directions that are generally parallel to the outer surface of the IHS chassis.