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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Fluid air conditioning, which can be achieved using indirect or straight ways, is used in electronics applications having thermal power densities that might go beyond secure dissipation with air cooling. Indirect fluid cooling is where heat dissipating electronic parts are literally separated from the liquid coolant, whereas in situation of straight air conditioning, the components are in straight call with the coolant.


In indirect air conditioning applications the electric 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 preventions are normally used, the electric conductivity of the fluid coolant mostly depends upon the ion concentration in the fluid stream.


The rise in the ion focus in a closed loophole fluid stream may happen because of ion leaching from steels and nonmetal parts that the coolant liquid touches with. Throughout operation, the electrical conductivity of the fluid might enhance to a degree which could be dangerous for the cooling system.

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(https://betteanderson.wixsite.com/my-site-1/post/revolutionizing-cooling-and-heating-solutions-with-chemie-s-dielectric-coolant)They are bead like polymers that are capable of trading ions with ions in an option that it touches with. In today job, ion leaching tests were carried out with numerous steels and polymers in both ultrapure deionized (DI) water, i.e. water which is treated to the highest degrees of purity, and low electric conductive ethylene glycol/water mix, with the measured adjustment in conductivity reported gradually.


The samples were permitted to equilibrate at space temperature for 2 days before tape-recording the initial electric conductivity. In all tests reported in this study liquid electric conductivity was determined to an accuracy 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 center of the heater. The PTFE sample containers were positioned in the furnace when constant state temperatures were gotten to. The test arrangement was eliminated from the heater every 168 hours (7 days), cooled down to room temperature with the electric conductivity of the liquid gauged.


The electrical conductivity of the liquid sample was kept track of for a total amount of 5000 hours (208 days). Schematic of the indirect shut loop cooling down experiment set-up. Elements made use of in the indirect shut loop cooling experiment that are in contact with the fluid coolant.


Before commencing each experiment, the examination configuration was washed with UP-H2O numerous times to get rid of any kind of contaminants. The system was filled with 230 ml of UP-H2O and was enabled to equilibrate at area temperature for an hour prior to tape-recording the first electrical conductivity, which was 1.72 S/cm. Liquid electric conductivity was measured to a precision of 1%.

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The change in fluid electrical conductivity was kept track of for 136 hours. The fluid from the system was collected and stored.


Table 2 reveals the test matrix that was made use of for both ion leaching and closed loophole indirect air conditioning experiments. The modification in electric conductivity of the liquid samples when stirred with Dowex blended bed ion exchange material was gauged.


0.1 g of Dowex resin was contributed to 100g of liquid samples that was absorbed a different container. The mixture was stirred and transform in the electric conductivity at room temperature level was gauged every hour. The measured modification in the electric conductivity of the UP-H2O and EG-LC examination fluids containing polymer or metal when involved for 5,000 hours at 80C is revealed Number 3.

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Ion leaching experiment: Calculated change in electrical conductivity of water and EG-LC coolants including either polymer or metal samples when immersed for 5,000 hours at 80C. The results show that metals contributed fewer ions into the fluids than plastics in both UP-H2O and EG-LC based coolants.




Liquids containing polypropylene and HDPE showed the cheapest electrical conductivity modifications. This could be as a result of the short, rigid, linear chains which are much less likely to contribute ions than longer branched chains with weak intermolecular forces. Silicone additionally performed well in both examination liquids, as polysiloxanes are typically chemically inert as a result of the high bond energy of the silicon-oxygen bond which would certainly protect against deterioration of the product into the fluid.

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It would certainly be expected that PVC would create comparable results to those of PTFE and HDPE based on the similar chemical frameworks of the products, however there might be various other impurities present in the PVC, such as plasticizers, that may influence the electrical conductivity of the liquid - meg glycol. Additionally, chloride groups in PVC can additionally seep into the examination liquid and can trigger a rise in electrical conductivity


Polyurethane completely disintegrated right into the examination fluid by the end of 5000 hour test. Before and after images of metal and polymer examples submersed for 5,000 hours at 80C in Continue the ion seeping experiment.


Measured modification in the electrical conductivity of UP-H2O coolant as a function of time with and without material cartridge in the shut indirect air conditioning loop experiment. The measured change in electric conductivity of the UP-H2O for 136 hours with and without ion exchange material in the loop is received Figure 5.