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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Liquid air conditioning, which can be attained making use of indirect or straight means, is made use of in electronics applications having thermal power thickness that may exceed secure dissipation through air cooling. Indirect liquid air conditioning is where heat dissipating electronic elements are literally divided from the liquid coolant, whereas in situation of straight air conditioning, the components are in direct contact with the coolant.In indirect air conditioning applications the electric conductivity can be vital if there are leakages and/or splilling of the fluids onto the electronic devices. In the indirect cooling applications where water based fluids with corrosion preventions are typically used, the electric conductivity of the fluid coolant primarily depends on the ion concentration in the fluid stream.
The increase in the ion concentration in a shut loophole liquid stream may take place as a result of ion leaching from steels and nonmetal parts that the coolant liquid is in contact with. During operation, the electric conductivity of the fluid might increase to a degree which could be hazardous for the cooling system.
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The samples were allowed to equilibrate at area temperature for 2 days before videotaping the first electrical conductivity. In all tests reported in this research study liquid electric conductivity was gauged to an accuracy of 1% utilizing an Oakton disadvantage 510/CON 6 collection meter which was calibrated prior to each measurement.
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from the wall surface heating coils to the facility of the heating system. The PTFE example containers were positioned in the heating system when constant state temperatures were gotten to. The examination setup was eliminated from the heater every 168 hours (7 days), cooled to space temperature with the electrical conductivity of the liquid measured.
The electrical conductivity of the liquid sample was monitored for a total of 5000 hours (208 days). Schematic of the indirect closed loop cooling experiment see set up. Elements made use of in the indirect shut loophole cooling down experiment that are in contact with the liquid coolant.
Before commencing each experiment, the examination arrangement was rinsed with UP-H2O numerous times to remove any kind of contaminants. The system was loaded with 230 ml of UP-H2O and was allowed to equilibrate at room temperature level for an hour prior to taping the first electrical conductivity, which was 1.72 S/cm. Fluid electrical conductivity was determined to an accuracy of 1%.
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Throughout operation the fluid storage tank temperature level was maintained at 34C. The adjustment in fluid electrical conductivity was kept track of for 136 hours. The liquid from the system was gathered and stored. Similarly, shut loop test with ion exchange material was accomplished with the same cleaning procedures used. The first electrical conductivity of the 230ml UP-H2O in the system measured 1.84 S/cm.
Table 2 shows the examination matrix that was utilized for both ion leaching and closed loophole indirect air conditioning experiments. The adjustment in electrical conductivity of the fluid samples when mixed with Dowex mixed bed ion exchange resin was gauged.
0.1 g of Dowex resin was contributed to 100g of fluid samples that was taken in a separate container. The mixture was mixed and alter in the electric conductivity at room temperature was determined every hour. The gauged adjustment in the electric conductivity of the UP-H2O and EG-LC examination fluids having polymer or metal when immersed for 5,000 hours at 80C is revealed Figure 3.
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Figure 3. Ion seeping experiment: Calculated change in electrical conductivity of water and EG-LC coolants including either polymer or metal samples when submersed for 5,000 hours at 80C. The outcomes suggest that steels contributed fewer ions into the fluids than plastics in both UP-H2O and EG-LC based coolants. This can be as a result of a slim steel oxide layer which might work as an obstacle to ion leaching and cationic diffusion.
Liquids containing polypropylene and HDPE showed the cheapest electrical conductivity modifications. This could be due to the short, inflexible, linear chains which are much less likely to contribute ions than longer branched chains with weaker intermolecular pressures. Silicone also executed well in both examination liquids, as polysiloxanes are usually chemically inert as a result of the high bond energy of the silicon-oxygen bond which would avoid degradation of the material into the fluid.
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It would certainly be anticipated that PVC would create similar outcomes to those of PTFE and HDPE based upon the similar chemical structures of the materials, however there may be various other impurities existing in the PVC, such as plasticizers, that might impact the electric conductivity of the liquid - silicone synthetic oil. Furthermore, chloride groups in PVC can also leach right into the examination liquid and can trigger a rise in electric conductivity
Polyurethane completely broke down right into the examination fluid by the end of 5000 hour test. Before and after pictures of steel and polymer examples submersed for 5,000 hours at 80C in the ion seeping experiment.
Calculated modification in the electrical conductivity of UP-H2O coolant as a feature of time with and without resin cartridge in the closed indirect cooling loop experiment. The measured change in electrical conductivity of the UP-H2O for 136 hours with and without ion exchange resin in the loop is displayed in Figure 5.
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