Immersion Cooling Cap Layer Liquid Vapor Barrier
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Solution Overview
Problem
Existing immersion cooling systems for high-performance computing face significant challenges due to persistent vapor pressure of the cooling liquids, leading to material loss and increased operational costs, as well as environmental concerns due to the use of non-environmentally friendly liquids.
Innovation Solution
The introduction of a 'cap layer' of liquid with specific properties, such as lower density and a preference to bind with itself rather than the lower liquid, creates an immiscible system that prevents the lower liquid from evaporating and escaping, thereby reducing material loss and allowing the use of more effective, albeit costly, heat transfer liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single dielectric liquid is used for immersion cooling, then heat transfer efficiency is improved, but material loss occurs due to vapor pressure and environmental harm increases
Solution Approach 1:
The cooling system is segmented into two distinct liquid layers: a lower dielectric liquid layer in direct contact with electronics for heat transfer, and an upper cap layer liquid that forms a vapor barrier. This segmentation allows each layer to perform its specific function - the lower layer maximizes heat removal while the upper layer prevents vapor escape and material loss.
Solution Approach 2:
The upper cap layer liquid acts as an intermediary substance between the lower dielectric liquid and the ambient environment. It mediates by forming an immiscible barrier that prevents the lower liquid's vapor from escaping into the ambient space, thereby reducing material loss while allowing the lower liquid to maintain its heat transfer function.
2Temperature
If effective heat transfer liquids are used, then cooling performance is improved, but operational costs increase due to frequent replenishment
Solution Approach 1:
The upper cap layer liquid provides self-service functionality by automatically forming a vapor barrier that prevents material loss. This self-regulating mechanism reduces the need for frequent liquid replenishment and maintenance, thereby lowering operational costs while maintaining effective cooling performance.
3Temperature
If traditional dielectric liquids are used, then heat removal is effective, but environmental harm increases due to PFAS and high GWP
Solution Approach 1:
The system uses a composite two-liquid configuration where the upper cap layer consists of environmentally friendly liquids (PFAS-free, low GWP) that form a protective barrier. This allows the lower layer to use effective heat transfer liquids while the upper layer mitigates environmental harm by preventing vapor escape of harmful substances.
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 enhances the heat removal efficiency of the system by using liquids with higher heat transfer capabilities, reduces operational costs by minimizing liquid replenishment needs, and mitigates environmental impact by employing PFAS-free and low GWP liquids.
Implementation Method 1
Persistent vapor pressure of the cooling liquids, leading to material loss
Implementation Method 2
The introduction of a 'cap layer' of liquid with specific properties, such as lower density and a preference to bind with itself rather than the lower liquid, creates an immiscible system that prevents the lower liquid from evaporating and escaping
Implementation Method 3
The heat exchanger 106 transfers heat from the warmed fluid to secondary liquid within a secondary cooling loop 107
Implementation Method 4
The pump 105 draws the warmed liquid 102 from the immersion bath chamber 103 to the heat exchanger 106
Data Source
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AI summary
An apparatus is described. The apparatus includes a chamber to contain one or more electronic components, a first liquid and a second liquid. The electronics to be immersed in the second liquid. The first liquid having less density than the second liquid so that the first liquid floats above the second liquid. The first liquid to return second liquid molecules received from the second liquid back to the second liquid. The chamber comprising a first fluidic channel to drain the first liquid from the chamber while the second liquid is within the chamber.