Low-Conductivity Aqueous Coolants for Electronic Device Cooling
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Solution Overview
Problem
Conventional cooling systems for electronic devices face challenges with high power consumption, thermal management inefficiencies, and safety risks due to the use of organic and fluorinated organic liquids, which are flammable and environmentally questionable, while aqueous coolants lack sufficient anti-corrosion properties and can cause electrical shorts.
Innovation Solution
Aqueous heat transfer fluids comprising glycol, water, azole derivatives, esters of orthosilicic acid or alkoxy alkylsilanes, and optional tertiary amines and monocarboxylic acids, formulated to maintain an electrical conductivity below 100 µS/cm, ensuring non-flammability and compatibility with electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water or water-based systems are used as heat transfer fluids, then heat transfer efficiency is improved, but electrical conductivity increases causing electrical short circuits
Solution Approach 1:
The patent changes the chemical composition parameters of the heat transfer fluid by using organic compounds with low electrical conductivity (conductivity < 100 µS/cm at 25°C) instead of conventional water-based fluids. This parameter change maintains effective heat transfer while eliminating electrical conductivity issues that cause short circuits.
Solution Approach 2:
The patent employs composite heat transfer fluids containing multiple organic components including esters of orthosilicic acid, azole derivatives, glycols, and carboxylic acids. This composite formulation achieves both low electrical conductivity and adequate heat transfer performance while providing corrosion protection for electronic components.
2Reliability
If organic heat transfer fluids are used, then electrical conductivity is reduced, but flashpoint decreases creating fire hazards
Solution Approach 1:
The patent carefully selects and formulates organic compounds to achieve an optimal parameter balance: electrical conductivity < 100 µS/cm and flashpoint > 95°C. This parameter optimization resolves the contradiction by choosing substances that are both electrically insulating and fire-resistant.
Solution Approach 2:
The patent converts the typically harmful flammability of organic fluids into a benefit by selecting specific compounds whose molecular structures provide both electrical insulation and fire resistance. The organic compounds' low polarity provides electrical insulation while their stable molecular structure raises flashpoint above 95°C, eliminating fire hazards.
3Object-affected harmful factors
If fluorinated organic liquids are used, then flammability is reduced, but environmental impact increases due to ozone-depleting potential
Solution Approach 1:
The patent extracts and eliminates fluorinated compounds from the heat transfer fluid formulation, replacing them with environmentally benign organic alternatives. This extraction removes the ozone-depleting potential while maintaining the non-flammable safety characteristic through careful selection of hydrocarbon-based compounds with high flashpoints.
Solution Approach 2:
The patent creates an environmentally inert heat transfer system by using organic compounds that are chemically stable, non-toxic, and do not deplete ozone. The selected esters, azole derivatives, and carboxylic acids form an inert thermal management environment that is both fire-resistant and environmentally sustainable.
4Productivity
If server density is increased, then processing power is improved, but power consumption of cooling systems increases exponentially
Solution Approach 1:
The patent changes the thermal properties of the cooling fluid by using organic compounds with optimized heat capacity and thermal conductivity. These parameter changes enable more efficient heat removal at lower flow rates and pump powers, reducing the exponential increase in cooling energy consumption that normally accompanies increased server density.
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
The solution provides effective thermal management with increased heat capacity and boiling point, reducing vapor pressure and electrical hazards, while being inert and compatible with electronic devices, thus enhancing energy efficiency and safety.
Implementation Method 1
heat transfer fluids are used to remove the generated heat. The thus warmed up heat transfer fluid is then conveyed to a heat exchanger, cooled down, and circulated back in a loop
Implementation Method 2
heat is transferred through a thermal interface material
Implementation Method 3
increased heat capacity and boiling point, reducing vapor pressure
Data Source
AI summary
The present application describes the use of coolants with low electrical conductivity in direct or indirect cooling of electronic devices.