CPU Immersion Cooling in Dielectric Liquid Bath
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Solution Overview
Problem
Current CPU cooling methods, such as forced air circulation, become inadequate as CPU power consumption increases, limiting the ability to maintain thermal limits and requiring novel cooling techniques to support growing data processing capacities.
Innovation Solution
A cooling system that immerses the CPU in a dielectric liquid bath, allowing for varying immersion depth and vapor pressure control, along with mechanisms to manage coolant bubbles and heat transfer surfaces, to effectively manage heat absorption and dissipation based on CPU cooling requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If forced air circulation is used for CPU cooling, then the cooling system is simple and easy to implement, but it becomes inadequate when CPU power consumption significantly increases
Solution Approach 1:
The patent changes the physical state parameter of the coolant from gas (air) to liquid, and further to liquid-vapor phase change, to dramatically increase heat transfer efficiency. This resolves the contradiction by maintaining simple system structure while achieving superior temperature control through phase change cooling.
Solution Approach 2:
The patent utilizes the phase transition of dielectric coolant from liquid to vapor and back, leveraging the high latent heat of vaporization to absorb excessive CPU heat. This phase change mechanism enables effective cooling of high-power CPUs while maintaining relatively simple system architecture.
2Temperature
If liquid immersion cooling is implemented, then CPU cooling effectiveness is dramatically improved, but system complexity increases due to additional components and control mechanisms
Solution Approach 1:
The dielectric coolant serves multiple functions simultaneously: it provides thermal conduction cooling, enables phase change cooling, acts as an electrical insulator, and facilitates heat transfer to external heat exchangers. This multi-functionality reduces the need for separate cooling mechanisms, thereby limiting the increase in system complexity.
Solution Approach 2:
The dielectric coolant acts as an intermediary substance that bridges the CPU and the external cooling system. It absorbs heat from the CPU through immersion and phase change, then transfers this heat to external heat exchangers, enabling effective cooling while isolating the CPU from direct contact with complex cooling infrastructure.
3Reliability
If dielectric coolant is used for immersion cooling, then electrical insulation is provided preventing short circuits, but heat transfer efficiency must be optimized
Solution Approach 1:
The patent utilizes the phase change parameter of the dielectric coolant, transitioning from liquid to vapor and back, to dramatically enhance heat transfer efficiency. This phase change mechanism overcomes the typical limitation of dielectric fluids while maintaining their electrical insulation properties, thus resolving the contradiction between reliability and heat transfer efficiency.
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 system provides efficient heat management by utilizing dielectric coolants and controlled immersion techniques, enabling the CPU to operate within thermal limits even under high power consumption, thereby supporting increased data processing capacities.
Implementation Method 1
immersing the CPU in a dielectric liquid bath
Implementation Method 2
utilizing phase change and conduction cooling modes
Data Source
AI summary
A system for cooling a CPU. The system has a tank for holding dielectric coolant in a liquid phase. The CPU is immersed in the coolant. A cover closes the tank. Electric pathways that convey data to/from the CPU traverse the cover. The electric pathways allow the CPU to exchange data with an external device. In this fashion, the CPU can perform data processing functions while being immersed in dielectric coolant.