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When equipment runs, it generates heat. Overheating can lead to equipment malfunctions and possible downtime. In order to prevent this, cooling and chilled water systems are set up to continually remove heat from the components to keep them within a desired temperature range. Water cooling is a method of heat removal that uses water as a medium to transfer heat. In other words, cooling water controls temperature by transferring heat from the equipment to the cooling water. Once the water has been heated, it must be cooled again, or be replaced by a fresh supply of cool water.