Two-Phase Liquid Cooling for Server Electronics
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Solution Overview
Problem
Conventional air-cooling systems for electronic components in server enclosures are inefficient, leading to high power usage and temperature management challenges, especially as external temperatures increase, with fans consuming a significant portion of the total power and struggling to maintain optimal temperature ranges.
Innovation Solution
Implementing a two-phase cooling system that circulates a coolant refrigerant through a two-phase refrigerant loop, combined with an air moving system using fans, to efficiently manage heat and maintain optimal temperatures within the enclosure, with sensors and controllers regulating the cooling systems to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air-cooling systems with fans are used to cool electronic components, then the system is simple to implement, but the power consumption increases significantly and temperature control becomes inefficient
Solution Approach 1:
The patent employs a two-phase cooling system where refrigerant undergoes phase transitions (liquid to vapor and vapor to liquid) to absorb and release heat from electronic components. This phase-change mechanism provides highly efficient heat transfer that dramatically reduces the power consumption compared to conventional air-cooling fans while maintaining effective temperature control.
Solution Approach 2:
The system uses a closed-loop hydraulic cooling system with refrigerant circulation through evaporators and condensers. This liquid-based cooling approach replaces the mechanical air movement of fans with a controlled refrigerant circulation system, achieving superior cooling efficiency with lower power consumption.
2Device complexity
If air-cooling systems are used, then the system structure is simple, but the cooling efficiency decreases as external temperatures increase
Solution Approach 1:
The two-phase cooling system utilizes refrigerant phase transitions that are independent of external ambient temperatures. The evaporator absorbs heat by converting liquid refrigerant to vapor, and the condenser releases heat by condensing vapor back to liquid, maintaining consistent cooling efficiency regardless of external temperature conditions.
Solution Approach 2:
The system changes the physical state parameters of the refrigerant (temperature, pressure, phase) to optimize heat transfer. By controlling refrigerant pressure and temperature through expansion devices and heat exchangers, the system maintains high cooling efficiency across varying external temperature conditions.
3Device complexity
If conventional air-cooling is used, then the system requires minimal components, but the ability to capture and manage heat is insufficient
Solution Approach 1:
The two-phase cooling system captures nearly 100% of heat generated by electronic components through the evaporator where refrigerant absorbs latent heat during phase change. The condenser then releases this captured heat to the external environment, achieving complete heat management that far exceeds conventional air-cooling capabilities.
Solution Approach 2:
The closed-loop hydraulic system with refrigerant circulation enables complete heat capture and transfer. The liquid refrigerant absorbs heat efficiently in the evaporator and releases it in the condenser, achieving superior heat management compared to passive air-cooling systems.
4Productivity
If two-phase cooling system is implemented, then the cooling efficiency and heat capture improve significantly, but the system complexity increases
Solution Approach 1:
The cooling system is segmented into distinct functional modules: evaporators for heat absorption, condensers for heat release, expansion devices for refrigerant metering, and circulation pumps. This modular segmentation allows for optimized heat transfer in each section while maintaining overall system manageability and high cooling efficiency.
Solution Approach 2:
The system leverages the high heat transfer coefficients associated with phase transitions to achieve superior cooling efficiency. The refrigerant's phase change from liquid to vapor in the evaporator and back to liquid in the condenser provides intense heat exchange that compensates for the increased system 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 significantly reduces electronic component temperatures, improves thermal management, and enhances energy efficiency by capturing nearly 100% of heat generated, achieving over 95% operating exit vapor quality and reducing overall power consumption.
Implementation Method 1
a pump that circulates a coolant refrigerant through a two-phase refrigerant loop
Implementation Method 2
two-phase cooling system that circulates a coolant refrigerant through a two-phase refrigerant loop
Implementation Method 3
an air moving system using fans, to efficiently manage heat and maintain optimal temperatures
Data Source
AI summary
Techniques that facilitate two-phase liquid cooling electronics are provided. In one example, a server system comprises a two-phase cooling system and an air moving system. The two-phase cooling system reduces a first temperature of a first electronic component in the server system using a pump that circulates a coolant refrigerant through a two-phase refrigerant loop associated with the first electronic component, where first electronic component satisfies a first defined criterion. The air moving system reduces a second temperature of a second electronic component in the server system using one or more fans associated with the second electronic component, where the second electronic component satisfies a second defined criterion.