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The bong cooler or evaporative cooling tower is a bong-shaped device that is used to cool water to sub-ambient temperatures via evaporative cooling. These coolers are generally made of ABS or PVC pipe, have a diameter of a few inches, and are a few feet in height. A cold air intake branches off about 2/3's of the way down, and the area below it forms a large reservoir for the water. Installing a fan which blows into the intake is optional, but will greatly improve the effectiveness of the cooler. Without a fan, the hot air will rise and exit at the top of the cooler, while fresh air will be drawn through the intake via negative pressure. There is an atomizer or shower head at the top of the cooler which allows the water to have an extremely large surface area through which evaporation can cool the water. There must be a water pump connected to the reservoir and atomizer in order to cycle the water that drips down back up to be re-atomized. A bong cooler can be a replacement for the radiator in a watercooled CPU. The sub-ambient temperatures that are achieved in the bong cooler are more effective at cooling the CPU than the above ambient water temperature in a radiator.
There are inherent problems with the bong cooler. Due to the system's use of evaporation, the reservoir must be refilled periodically with distilled water. If hard water is used, some type of mineral filter must be used in order to prevent mineral deposits from forming.
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