MEMS Phase-Change Cooling Cell for Compact High-Heat Electronics
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Solution Overview
Problem
Existing cooling technologies, including fans and passive devices, are inadequate for high-power computing systems like servers, which generate significant heat and require efficient, low-noise cooling solutions.
Innovation Solution
A MEMS cooling system utilizing a vibrational motion-driven mixture of liquid and gas through a chamber, where a phase change occurs, transferring heat from a heat-generating structure, and incorporating a vapor chamber and heat recovery subsystem to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling devices such as fans are used to drive air through computing devices, then cooling effectiveness is improved, but device size and noise increase
Solution Approach 1:
The patent employs a vibrating membrane within a closed-loop heat pipe system to drive phase change of the working fluid. The vibration creates pressure differentials that circulate the fluid through evaporation and condensation cycles, enabling effective heat transfer without requiring large external fans or blowers. This mechanical vibration approach achieves cooling effectiveness while maintaining a compact form factor suitable for mobile devices.
Solution Approach 2:
The patent utilizes phase change of a working fluid within a closed-loop heat pipe system. The fluid evaporates at the heat-generating component, absorbs latent heat, condenses in the heat dissipation section, and releases heat. This pneumatic-hydraulic phase change mechanism provides efficient heat transfer without requiring large mechanical cooling components, thus improving cooling effectiveness while reducing device size.
2Volume of moving object
If passive cooling devices such as heat spreaders are used in mobile devices, then device size is reduced, but cooling effectiveness becomes inadequate for high power systems
Solution Approach 1:
The vibrating membrane actively drives phase change circulation within the heat pipe system, creating dynamic pressure differentials that enhance heat transfer rates. This active vibration mechanism transforms the passive heat pipe into an active cooling system capable of handling high power dissipation while maintaining a compact mobile device form factor.
Solution Approach 2:
The patent employs phase change of the working fluid between liquid and vapor states within the closed-loop heat pipe. The fluid evaporates at the hot end absorbing latent heat, then condenses at the cooler end releasing heat. This phase transition mechanism provides high heat transfer efficiency per unit volume, enabling effective cooling of high-power systems in compact mobile devices without requiring large heat sinks or fans.
3Power
If multiple high power processors are placed in proximity in server systems, then computing power is increased, but heat generation and cooling requirements increase significantly
Solution Approach 1:
The closed-loop heat pipe system utilizes phase change of the working fluid to transfer heat from high-power processors. The fluid evaporates at the processor interface absorbing large amounts of latent heat, then condenses at the heat dissipation section releasing the heat. This phase transition mechanism provides high heat flux capability necessary for cooling multiple high-power processors in close proximity, enabling increased computing power while managing the resulting heat generation.
Solution Approach 2:
The patent employs pneumatic-hydraulic phase change circulation within a closed-loop heat pipe system to transfer heat from high-power processors. The working fluid continuously evaporates and condenses, creating efficient heat transfer that can handle the high heat flux from multiple processors placed in proximity, thus enabling increased computing power while managing heat generation.
4Volume of moving object
If traditional cooling solutions are used in devices with limited space, then device portability is improved, but cooling efficiency becomes insufficient for high power dissipation
Solution Approach 1:
The patent employs phase change of a working fluid within a compact closed-loop heat pipe system. The fluid evaporates at the heat-generating component absorbing latent heat, then condenses in the heat dissipation section releasing heat. This phase transition mechanism provides high heat transfer efficiency per unit volume, enabling effective cooling of high-power systems in compact mobile devices without compromising portability.
Solution Approach 2:
The vibrating membrane actively drives phase change circulation within the compact heat pipe system, creating dynamic pressure differentials that enhance heat transfer rates. This active vibration mechanism enables high cooling efficiency in a compact volume suitable for portable devices, overcoming the limitation of traditional passive cooling in space-constrained high-power applications.
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 dissipates heat in high-power systems with minimal noise, suitable for devices with limited space, achieving high flow rates and heat transfer efficiency.
Implementation Method 1
At least a portion of the liquid undergoes a liquid-vapor phase change, which transfers heat from the heat-generating structure to the mixture
Implementation Method 2
The active element is configured to vibrate when activated. The vibrational motion drives a mixture of a liquid and a gas through the chamber and proximate to the heat-generating structure
Implementation Method 3
incorporating a vapor chamber and heat recovery subsystem to enhance cooling efficiency
Data Source
AI summary
A cooling system is described. The cooling system includes a heat-generating structure (e.g. a heat spreader) and a cooling cell coupled with the heat-generating structure. The cooling cell includes a chamber having an active element therein. The active element is configured to undergo vibrational motion when activated. The vibrational motion drives a mixture of a liquid and a gas through the chamber and proximate to the heat-generating structure. At least a portion of the liquid undergoes a liquid-vapor phase change, which transfers heat from the heat-generating structure to the mixture.