Immersion-Cooled Datacenter Buffer Tanks for Condenser Failure
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Solution Overview
Problem
Conventional immersion cooling systems face challenges in maintaining effective thermal management when condensers fail, leading to increased temperatures and pressures that can damage heat-generating components due to the lack of efficient vapor and liquid fluid management.
Innovation Solution
The system incorporates a vapor buffer tank and a liquid buffer tank, connected through conduits with valves and pumps, to manage vapor and liquid flow, allowing safe venting and supplemental fluid supply to maintain cooling even in condenser failures, thereby preventing over-heating and pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional immersion cooling systems operate without buffer tanks, then the system structure is simpler, but the system cannot maintain cooling effectiveness when condensers fail
Solution Approach 1:
The patent introduces buffer tanks that are pre-filled with working fluid and positioned to automatically engage when condenser failure occurs. The vapor buffer tank is pre-positioned to receive vapor when the condenser fails, and the liquid buffer tank is pre-positioned to supply liquid when needed, enabling automatic maintenance of cooling effectiveness without requiring complex active control systems during failure events.
Solution Approach 2:
The buffer tanks serve as a cushioning mechanism that absorbs the impact of condenser failure. By having excess working fluid stored in the liquid buffer tank and vapor accommodation space in the vapor buffer tank, the system can withstand condenser failure without immediate loss of cooling effectiveness, thus cushioning against the harmful effects of component failure.
2Temperature
If vapor is not vented during condenser failure, then pressure buildup is prevented, but temperature increases damage components
Solution Approach 1:
The vapor buffer tank acts as an intermediary component between the immersion chamber and the external environment. When the condenser fails, vapor accumulates in the vapor buffer tank rather than directly increasing pressure in the immersion chamber. The buffer tank mediates the pressure increase, allowing temperature control while limiting harmful pressure buildup through its volumetric accommodation capacity.
3Object-generated harmful factors
If liquid working fluid level decreases during condenser failure, then vapor can escape, but cooling capacity is reduced
Solution Approach 1:
The liquid buffer tank is pre-filled with working fluid and positioned to automatically supply liquid to the immersion chamber when the liquid level decreases during condenser failure. This preliminary preparation ensures that the cooling capacity is maintained by automatically replenishing the liquid working fluid, preventing the harmful effect of vapor escape while maintaining productivity.
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 ensures continuous cooling and pressure regulation, protecting components by safely venting vapor and replenishing liquid, thus maintaining optimal operating conditions despite condenser failures.
Implementation Method 1
The condenser is positioned in fluid communication with the headspace to condense the vapor portion of the working fluid to the liquid portion of the working fluid
Implementation Method 2
Liquid cooling can effectively cool components as liquid working fluids have more thermal mass than air or gas cooling
Implementation Method 3
The liquid working fluid absorbs heat from the heat-generating components
Implementation Method 4
The vapor in the cooling liquid can adversely affect the cooling performance of the working fluid. The vapor can be condensed and returned to the immersion tank
Data Source
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AI summary
A thermal management system for cooling electronic devices includes an immersion cooling system, a vapor buffer tank, and a liquid buffer tank. The immersion cooling system includes an immersion tank defining an immersion chamber, a working fluid in the immersion chamber, and a condenser. A liquid portion of the working fluid defines an immersion bath in the immersion chamber and a vapor portion defines a headspace above the immersion bath in the immersion chamber. The condenser condenses the vapor portion of the working fluid to the liquid portion of the working fluid. The vapor buffer tank is in fluid communication with the headspace, and a vapor valve selectively allows fluid communication between the vapor buffer tank and the headspace. The liquid buffer tank is in fluid communication with the immersion chamber, and a liquid valve selectively allows fluid communication between the liquid buffer tank and the immersion chamber.