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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Fluid air conditioning, which can be accomplished using indirect or direct methods, is utilized in electronic devices applications having thermal power thickness that may exceed safe dissipation through air cooling. Indirect liquid cooling is where heat dissipating digital components are literally divided from the fluid coolant, whereas in situation of straight air conditioning, the components are in straight contact with the coolant.


However, in indirect air conditioning applications the electrical conductivity can be essential if there are leakages and/or splilling of the fluids onto the electronics. In the indirect cooling applications where water based fluids with deterioration inhibitors are typically used, the electrical conductivity of the fluid coolant mostly depends on the ion concentration in the fluid stream.


The increase in the ion concentration in a shut loop fluid stream may happen due to ion leaching from metals and nonmetal components that the coolant liquid touches with. Throughout procedure, the electrical conductivity of the liquid might increase to a degree which can be harmful for the air conditioning system.

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(https://anyflip.com/homepage/ljptw#About)They are bead like polymers that are qualified of exchanging ions with ions in a remedy that it touches with. In today work, ion leaching tests were done with various steels and polymers in both ultrapure deionized (DI) water, i.e. water which is treated to the highest levels of purity, and reduced electric conductive ethylene glycol/water mixture, with the determined change in conductivity reported in time.


The samples were enabled to equilibrate at room temperature for 2 days before taping the initial electrical conductivity. In all tests reported in this research study liquid electrical conductivity was gauged to a precision of 1% using an Oakton CON 510/CON 6 collection meter which was adjusted before each measurement.

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from the wall surface heating coils to the center of the heater. The PTFE sample containers were positioned in the furnace when steady state temperatures were reached. The examination setup was eliminated from the furnace every 168 hours (7 days), cooled to area temperature with the electric conductivity of the liquid measured.


The electric conductivity of the fluid sample was kept an eye on for an overall of 5000 hours (208 days). Figure 2. Schematic of the indirect closed loop cooling experiment set up - high temperature thermal fluid. Table 1. Elements used in the indirect shut loop cooling down experiment that touch with the liquid coolant. A schematic of the experimental configuration is displayed in Figure 2.


Before starting each experiment, the test configuration was washed with UP-H2O a number of times to remove any type of contaminants. The system was loaded with 230 ml of UP-H2O and was allowed to equilibrate at space temperature level for an hour before recording the preliminary electric conductivity, which was 1.72 S/cm. Liquid electrical conductivity was gauged to an accuracy of 1%.

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The change in liquid electrical conductivity was checked for 136 hours. The fluid from the system was collected and kept.


Table 2 shows the test matrix that was used for both ion leaching and closed loophole indirect air conditioning experiments. The adjustment in electrical conductivity of the liquid samples when stirred with Dowex combined bed ion exchange resin was determined.


0.1 g of Dowex resin was contributed to 100g of liquid samples that was taken in a separate container. The mixture was mixed and change in the electrical conductivity at space temperature was gauged every hour. The determined adjustment in the electric conductivity of the UP-H2O and EG-LC test fluids containing polymer or steel when involved for 5,000 hours at 80C is shown Number 3.

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Ion leaching experiment: Calculated change in electrical conductivity of water and EG-LC coolants including either polymer or steel examples when immersed for 5,000 hours at 80C. The outcomes indicate that metals added fewer ions into the liquids than plastics in both UP-H2O and EG-LC based coolants.




Liquids including polypropylene and HDPE exhibited the least expensive electric conductivity adjustments. This can be because of the short, stiff, linear chains which are much less most likely to contribute ions than longer branched chains with weak intermolecular forces. Silicone likewise performed well in both test fluids, as polysiloxanes are normally chemically inert as a result of the high bond power of the silicon-oxygen bond which would certainly stop deterioration of the product right into the liquid.

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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 structures of the products, nonetheless there might be other pollutants existing in the PVC, such as plasticizers, that may influence the electric conductivity of the liquid - high temperature thermal fluid. Furthermore, chloride groups in PVC can also leach right into the test fluid and my company can cause a boost in electric conductivity


Buna-N rubber and polyurethane revealed indicators of deterioration and thermal disintegration which recommends that their feasible utility as a gasket or glue product at greater temperatures can lead to application concerns. Polyurethane totally disintegrated into the examination liquid by the end of 5000 hour test. Figure 4. Prior to and after pictures of metal and polymer examples 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 material cartridge in the closed indirect cooling loop experiment. The determined modification in electric conductivity of the UP-H2O for 136 hours with and without ion exchange material in the loophole is received Number 5.

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