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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Fluid air conditioning, which can be attained making use of indirect or straight ways, is used in electronics applications having thermal power densities that may go beyond safe dissipation via air cooling. Indirect fluid air conditioning is where warm dissipating digital components are physically separated from the liquid coolant, whereas in case of straight cooling, the components are in direct call with the coolant.


Nevertheless, in indirect cooling applications the electrical conductivity can be vital if there are leakages and/or spillage of the liquids onto the electronics. In the indirect air conditioning applications where water based liquids with corrosion inhibitors are generally made use of, the electrical conductivity of the fluid coolant mostly depends upon the ion concentration in the liquid stream.


The increase in the ion concentration in a closed loophole fluid stream may take place because of ion seeping from steels and nonmetal elements that the coolant fluid is in call with. During procedure, the electrical conductivity of the liquid may enhance to a degree which could be damaging for the cooling system.

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(https://chemie999.wordpress.com/2025/01/10/discover-chemies-innovative-heat-transfer-solutions/)They are grain like polymers that are qualified of exchanging ions with ions in a service that it touches with. In the existing work, ion leaching tests were done with different metals and polymers in both ultrapure deionized (DI) water, i.e. water which is dealt with to the highest degree of pureness, and low electric conductive ethylene glycol/water mix, with the measured adjustment in conductivity reported in time.


The samples were allowed to equilibrate at area temperature for 2 days before tape-recording the preliminary electric conductivity. In all tests reported in this research fluid electric conductivity was gauged to a precision of 1% using an Oakton disadvantage 510/CON 6 series meter which was adjusted prior to each dimension.

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from the wall heating coils to the center of the furnace. The PTFE sample containers were put in the heating system when stable state temperature levels were reached. The test setup was removed from the heating system every 168 hours (7 days), cooled to area temperature with the electrical conductivity of the liquid measured.


The electrical conductivity of the fluid sample was monitored for an overall of 5000 hours (208 days). Schematic of the indirect closed loop cooling down experiment set up. Components used in the indirect shut loophole cooling experiment that are in contact with the fluid coolant.


Prior to commencing each experiment, the examination configuration was washed with UP-H2O a number of times to remove any kind of contaminants. The system was filled with 230 ml of UP-H2O and was allowed to equilibrate at room temperature level for an hour prior to taping the initial electric conductivity, which was 1.72 S/cm. Fluid electrical conductivity was gauged to an accuracy of 1%.

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The adjustment in liquid electrical conductivity was checked for 136 hours. The liquid from the system was accumulated and saved.


Table 2. Examination matrix for both ion leaching and indirect closed loop cooling experiments. Table 2 reveals the test matrix that was utilized for both ion leaching and closed loop indirect air conditioning experiments. The modification in electric conductivity of the fluid examples when mixed with Dowex mixed bed ion exchange material was measured.


0.1 g of Dowex material was added to 100g of liquid examples that was absorbed a different container. The mixture was stirred and transform in the electric conductivity at room temperature level was determined every hour. The measured change in the electrical conductivity of the UP-H2O and EG-LC examination liquids containing polymer or steel when involved for 5,000 hours at 80C is shown Number 3.

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Number 3. Ion seeping experiment: Measured change in electric conductivity of water and EG-LC coolants including either polymer or metal samples when immersed for 5,000 hours at 80C. The outcomes indicate that metals added less ions into the fluids than plastics in both UP-H2O and EG-LC based coolants. This might be as a result of a thin metal oxide layer which might serve as a barrier to ion leaching and cationic diffusion.




Fluids including polypropylene and HDPE exhibited the most affordable electrical conductivity adjustments. This could be due to the short, inflexible, direct chains which are less most likely to contribute ions than longer branched chains with weak intermolecular forces. Silicone also carried out well in both examination fluids, as polysiloxanes are generally chemically inert due to the high bond power of the silicon-oxygen bond which would prevent destruction of the product into the liquid.

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It would certainly be expected that PVC would certainly produce comparable outcomes to those of PTFE and HDPE based on the similar chemical frameworks of the products, however there may be various other impurities existing in the PVC, such as plasticizers, that may impact the electric conductivity of the fluid - inhibited antifreeze. Additionally, chloride teams in PVC can also leach right into the examination liquid and can trigger a boost in electric conductivity


Buna-N rubber and polyurethane revealed indications of destruction and thermal decomposition which her latest blog suggests that their possible energy as a gasket or sticky product at greater temperature levels could cause application concerns. Polyurethane entirely disintegrated into the test fluid by the end of 5000 hour test. Figure 4. Prior to and after photos of steel and polymer examples immersed for 5,000 hours at 80C in the ion leaching experiment.


Measured modification in the electric conductivity of UP-H2O coolant as a function of time with and without resin cartridge in the closed indirect cooling loop experiment. The gauged adjustment in electric conductivity of the UP-H2O for 136 hours with and without ion exchange material in the loophole is displayed in Figure 5.