Tap water meets the needs of most liquid-cooling applications. However, deionized (DI) water has chemical and electrical properties that make it the optimal choice for cooling when the liquid circuit contains micro-channels or when sensitive electronics are involved.
As the name implies, DI water has an extremely low concentration of ions which imparts important performance attributes. First, it eliminates mineral deposits which block the coolant flow. This will degrade cooling efficiency and system operating performance. Second, it eliminates the risk of electrical arcing due to static charge build up from the circulating coolant. The arcing can damage sensitive control electronics in the equipment being cooled. The lack of ions in DI water eliminates both of these problems.
Applications that require the use of DI water are found in industries such as:
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