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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Fluid cooling, which can be accomplished using indirect or direct methods, is used in electronic devices applications having thermal power densities that may go beyond risk-free dissipation with air cooling. Indirect liquid air conditioning is where warm dissipating digital components are physically separated from the liquid coolant, whereas in instance of direct cooling, the elements are in straight contact with the coolant.


In indirect air conditioning applications the electrical conductivity can be important if there are leakages and/or spillage of the liquids onto the electronic devices. In the indirect air conditioning applications where water based fluids with corrosion preventions are typically utilized, the electrical conductivity of the fluid coolant mainly depends upon the ion concentration in the liquid stream.


The increase in the ion concentration in a shut loop fluid stream might take place because of ion leaching from metals and nonmetal components that the coolant fluid is in contact with. Throughout operation, the electric conductivity of the liquid may increase to a degree which can be hazardous for the air conditioning system.

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(https://www.magcloud.com/user/chemie999)They are grain like polymers that can exchanging ions with ions in an option that it is in call with. In the present job, ion leaching tests were performed with numerous metals and polymers in both ultrapure deionized (DI) water, i.e. water which is dealt with to the greatest degrees of pureness, and low electrical conductive ethylene glycol/water mix, with the determined change in conductivity reported over time.


The samples were permitted to equilibrate at room temperature level for two days prior to taping the initial electrical conductivity. In all tests reported in this research study fluid electrical conductivity was measured to a precision of 1% using an Oakton CON 510/CON 6 series meter which was adjusted before each measurement.

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from the wall heating coils to the facility of the heating system. The PTFE sample containers were placed in the heating system when constant state temperatures were reached. The test configuration was gotten rid of from the furnace every 168 hours (seven days), cooled to area temperature level with the electrical conductivity of the fluid measured.


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


Before starting each experiment, the test arrangement was rinsed with UP-H2O a number of times to get rid of any type of pollutants. The system was loaded with 230 ml of UP-H2O and was allowed to equilibrate at room temperature level for an hour before recording the preliminary electrical conductivity, which was 1.72 S/cm. Fluid electric conductivity was gauged to a precision of 1%.

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The modification in fluid electric conductivity was checked for 136 hours. The liquid from the system was collected and stored.


Table 2 shows the test matrix that was used for both ion leaching and shut loophole indirect cooling experiments. The adjustment in electrical conductivity of the liquid samples when stirred with Dowex blended bed ion exchange material was measured.


0.1 g of Dowex material was included in 100g of fluid samples that was taken in a separate container. The blend was stirred and transform in the electrical conductivity at area temperature level was measured every hour. The gauged modification in the electric conductivity of the UP-H2O and EG-LC test fluids including polymer or metal when engaged for 5,000 hours at 80C is her explanation shown Figure 3.

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Figure 3. Ion leaching experiment: Measured adjustment in electric conductivity of water and EG-LC coolants consisting of either polymer or metal samples when submersed for 5,000 hours at 80C. The results show that steels added fewer ions right into the fluids than plastics in both UP-H2O and EG-LC based coolants. This might be because of a slim metal oxide layer which might act as a barrier to ion leaching and cationic diffusion.




Fluids containing polypropylene and HDPE showed the most affordable electrical conductivity changes. This can be because of the short, stiff, linear chains which are much less likely to add ions than longer branched chains with weaker intermolecular forces. Silicone also performed well in both test fluids, as polysiloxanes are usually chemically inert due to the high bond power of the silicon-oxygen bond which would protect against deterioration of the material right into the fluid.

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It would be expected that PVC would certainly generate comparable results to those of PTFE and HDPE based on the comparable chemical frameworks of the products, however there may be various other contaminations present in the PVC, such as plasticizers, that may affect the electric conductivity of the fluid - silicone synthetic oil. Additionally, chloride groups in PVC can additionally seep right into the examination liquid and can cause an increase in electrical conductivity


Polyurethane entirely broke down into the test fluid by the end of 5000 hour examination. Before and after images of metal and polymer samples immersed for 5,000 hours at 80C in the ion seeping experiment.


Measured change in the electrical conductivity of UP-H2O coolant as a function of time with and without resin cartridge in the closed indirect air conditioning loophole experiment. The gauged adjustment in electric conductivity of the UP-H2O for 136 hours with and without ion exchange resin in the loop is received Number 5.