Two-Phase Cold Plate Cooling With Gas Extraction and Re-Injection
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Solution Overview
Problem
Existing technologies have not effectively addressed the issue of poor stability in two-phase cold plate liquid cooling systems due to differences in internal flow characteristics between two-phase and single-phase systems, resulting in gas and liquid phase changes leading to sharp increases in volumetric flow rate and pressure, causing gas blockages and instability.
Innovation Solution
A method and apparatus for controlling a two-phase cold plate liquid cooling system by extracting gaseous medium from an evaporator outlet, condensing it in a condenser to form a liquid phase, and spraying this liquid phase back into the evaporator to absorb latent heat, thereby reducing gaseous volume and pressure, using a gas extraction tube, condenser, and nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-phase multi-channel equal-height flat parallel flow channel structure is reused in a two-phase cold plate, then the structural simplicity is maintained, but the system stability deteriorates due to gas phase increase and liquid phase decrease causing sharp volumetric flow rate increase
Solution Approach 1:
The flow channel structure is divided into variable-height sections with different heights in different regions. The channel height is adjusted along the flow direction to compensate for the volumetric expansion caused by liquid-to-gas phase change, maintaining stable flow distribution and preventing gas accumulation that would cause instability.
Solution Approach 2:
Different sections of the flow channel are designed with different local properties (different heights) according to the local flow characteristics. The channel height is locally optimized in regions where phase change occurs to maintain appropriate flow velocity and pressure distribution, preventing the sharp volumetric flow rate increase that leads to instability.
2Temperature
If the working medium flows through the evaporator causing phase change from liquid to gas, then the cooling function is achieved, but the volumetric flow rate sharply increases causing system instability
Solution Approach 1:
The channel height parameter is changed along the flow direction to adapt to the phase change process. By varying the channel height parameter in response to the liquid-to-gas transition, the system maintains stable flow characteristics despite the sharp increase in volumetric flow rate, preventing instability while achieving the required cooling effect.
3Stability of the object's composition
If gas extraction tube and nozzle are added to extract and re-inject liquid phase medium, then the system stability is improved, but the device complexity increases
Solution Approach 1:
The gas extraction tube extracts the liquid phase medium separated from the gas phase at the outlet. By taking out and separately handling the liquid phase component, the system can re-inject it through the nozzle to maintain stable flow characteristics, improving system stability despite the added structural complexity.
Solution Approach 2:
The nozzle acts as an intermediary device that re-injects the extracted liquid phase medium back into the flow. This intermediary mechanism allows the system to recover and reuse the liquid phase, maintaining stability by compensating for the liquid phase decrease caused by evaporation, justifying the added structural complexity.
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 approach stabilizes the two-phase cold plate liquid cooling system by reducing gaseous volume and pressure, preventing gas blockages, and enhancing system stability through the use of a gas extraction tube, condenser, and nozzle to manage phase changes effectively.
Implementation Method 1
condensing the gaseous medium in a condenser of the two-phase cold plate liquid cooling system to obtain a first liquid-phase medium corresponding to the gaseous medium
Implementation Method 2
the first liquid-phase medium is used to absorb gaseous latent heat of the gaseous medium at the outlet of the evaporator
Data Source
AI summary
Embodiments of this application provide a method and apparatus for controlling a two-phase cold plate liquid cooling system, and a system. The method includes: controlling a gas extraction tube to extract a gaseous medium from an outlet of an evaporator in an operation process of the two-phase cold plate liquid cooling system, where the two-phase cold plate liquid cooling system at least includes the gas extraction tube and the evaporator; condensing the gaseous medium in a condenser of the two-phase cold plate liquid cooling system to obtain a first liquid-phase medium corresponding to the gaseous medium; and controlling a nozzle of the two-phase cold plate liquid cooling system to spray the first liquid-phase medium into the outlet of the evaporator, where the first liquid-phase medium is used to absorb gaseous latent heat of the gaseous medium at the outlet of the evaporator. This application solves the technical problem of poor stability of the two-phase cold plate liquid cooling system.