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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Liquid air conditioning, which can be achieved using indirect or direct means, is made use of in electronic devices applications having thermal power thickness that may surpass safe dissipation through air cooling. Indirect fluid cooling is where warmth dissipating digital elements are literally divided from the liquid coolant, whereas in case of straight air conditioning, the elements are in straight contact with the coolant.In indirect cooling applications the electric conductivity can be crucial if there are leakages and/or spillage of the liquids onto the electronics. In the indirect air conditioning applications where water based liquids with rust inhibitors are normally made use of, the electric conductivity of the fluid coolant mostly depends upon the ion focus in the fluid stream.
The boost in the ion concentration in a shut loop liquid stream may occur as a result of ion seeping from steels and nonmetal components that the coolant liquid touches with. During operation, the electric conductivity of the liquid may increase to a degree which can be unsafe for the air conditioning system.
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The examples were permitted to equilibrate at space temperature level for two days prior to tape-recording the preliminary electric conductivity. In all tests reported in this study liquid electrical conductivity was determined to a precision of 1% making use of an Oakton CON 510/CON 6 series meter which was adjusted before each dimension.
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from the wall surface heating coils to the center of the furnace. The PTFE sample containers were placed in the heating system when constant state temperatures were reached. The test arrangement was removed from the furnace every 168 hours (seven days), cooled to space temperature with the electric conductivity of the liquid measured.
The electrical conductivity of the fluid example was kept track of for an overall of 5000 hours (208 days). Schematic of the indirect closed loop cooling down experiment set up. Elements utilized in the indirect shut loop cooling down experiment that are in call with the liquid coolant.
Before beginning each experiment, the test setup was rinsed with UP-H2O a number of times to get rid of any type of contaminants. The system was loaded with 230 ml of UP-H2O and was allowed to equilibrate at room temperature for an hour before taping the preliminary electrical conductivity, which was 1.72 S/cm. Liquid electrical conductivity was gauged to a precision of 1%.
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The modification in liquid electric conductivity was kept an eye on for 136 hours. The liquid from the system was accumulated and saved.
Table 2 shows the test matrix that was made use of for both ion leaching and closed loophole indirect cooling experiments. The adjustment in electrical conductivity of the liquid examples when mixed with Dowex combined bed ion exchange resin was measured.
0.1 g of Dowex resin was included in 100g of fluid samples that was absorbed a different container. The mix was stirred and change in the electrical conductivity at room temperature was determined every hour. The determined modification in the electrical conductivity of the UP-H2O and EG-LC test liquids having polymer or metal when engaged for 5,000 hours at 80C is revealed Figure 3.
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Ion seeping experiment: Measured change in electrical conductivity of water and EG-LC coolants consisting of either polymer or metal examples when immersed for 5,000 hours at 80C. The results suggest that steels contributed less ions right into the liquids than plastics in both UP-H2O and EG-LC based coolants.
Liquids consisting of polypropylene and HDPE displayed the most affordable electric conductivity changes. This could be as a result of the short, stiff, direct chains which are less most likely to add ions than longer branched chains with weak intermolecular forces. Silicone also performed well in both test liquids, as polysiloxanes are generally chemically inert due to the high bond power of the silicon-oxygen bond which would stop degradation of the material right into the fluid.
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It would be anticipated that PVC would generate similar results to those of PTFE additional hints and HDPE based upon the comparable chemical structures of the products, nonetheless there might be various other impurities present in the PVC, such as plasticizers, that might influence the electric conductivity of the liquid - fluorinert. In addition, chloride groups in PVC can likewise seep right into the examination fluid and can create an increase in electrical conductivity
Polyurethane totally disintegrated into the test fluid by the end of 5000 hour test. Before and after photos of metal and polymer examples immersed for 5,000 hours at 80C in 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 gauged adjustment in electrical conductivity of the UP-H2O for 136 hours with and without ion exchange material in the loop is received Figure 5.
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