Absorption Heat Sink Layout for Passive Server Cooling
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Solution Overview
Problem
Conventional cooling methods for high-performance electronic components, such as CPUs, are inadequate due to limitations in heat transfer capacity and reliability, leading to increased costs and reduced system performance, as they struggle to manage the rapid heat generation and hot spots in data centers and servers.
Innovation Solution
The implementation of a passive absorption heat sink device with a contained absorption refrigeration cycle, utilizing a shell with low-pressure compartments and bubble pumps to transfer heat from electronic components to cooling air, eliminating the need for compressors and motorized pumps, and using waste heat to activate the cooling cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air cooling with fans and heat sinks is used, then cooling capacity is provided for electronic components, but the system reaches practical application limits and becomes inadequate for high-power components
Solution Approach 1:
The patent employs phase transition of refrigerant (evaporation and condensation) within the heat sink to enable active heat absorption and removal. The refrigerant circulates through closed channels, evaporating at the base to absorb heat from the electronic component and condensing in the fins to release heat to the surrounding air, providing superior cooling capacity for high-power components
Solution Approach 2:
The patent replaces the mechanical fan-driven air cooling system with a passive two-phase heat transfer system. Instead of using fans to force air convection, the invention uses phase change of refrigerant to actively absorb and transport heat, eliminating the need for mechanical moving parts while achieving higher heat removal capacity
2Productivity
If the number of heat transfer fins is increased to improve cooling, then heat removal capacity increases, but the space available for fins is limited and pressure drop increases
Solution Approach 1:
The patent uses two-phase heat transfer in the fins where refrigerant evaporates and condenses within closed channels. This phase change mechanism provides high heat transfer coefficients that enable effective cooling with reduced fin count and smaller overall heat sink volume compared to single-phase air cooling systems
3Reliability
If standard cooling methods are used, then cooling is provided, but bulky fan and heat sink assemblies are required which limit system capacity increase
Solution Approach 1:
The patent utilizes two-phase heat transfer with refrigerant evaporation and condensation to achieve high heat removal capacity in a compact form factor. The phase change mechanism provides intensive heat transfer that reduces the overall volume of the heat sink assembly compared to conventional single-phase air cooling systems requiring large fans and extensive fin arrays
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 solution provides efficient, reliable, and cost-effective thermal management by reducing the need for additional power sources, minimizing hot spots, and allowing for flexible cooling solutions tailored to varying heat flux demands, thereby enhancing the reliability and efficiency of high-performance computing systems.
Implementation Method 1
an enhanced heat sink assembly or device that can be attached to a heat generating surface of electronic components such as a processor to provide cooling based on the absorption refrigeration cycle in a passive manner
Implementation Method 2
a heat sink mounted such that its base is in heat conducting contact with an external surface of an electronic component
Implementation Method 3
two or more passive pumps such as bubble pumps are provided to connect the generator and absorber
Data Source
AI summary
A passive heat sink for cooling an electronic component such as a high-performance processor. The heat sink includes a shell with a surface that is positionable adjacent a heat generating surface of the electronic component. The shell includes a heat exchanger portion with cooling fins extending outward and positioned in a fan-provided airflow. A generator compartment is provided within the shell with a generator vessel for containing an absorbent, and the generator compartment is maintained at a pressure lower than ambient. The generator compartment conducts heat away from the electronic component to the absorbent in the generator vessel. An absorber compartment, at a pressure lower than the generator compartment, is provided within the shell above the generator compartment, and, in use, an absorption refrigeration cycle contained within the shell is activated by heat from the electronic component. A bubble pump moves absorbent from the generator compartment to the absorber compartment.