Immersion cooling is a type of liquid cooling. The server is entirely submerged in a tank with a particular non-conductive solution or oil, based on the cooling type, where heat generated by the immersed server is transferred into the cooling liquid.
There are two types of immersion cooling based on dielectric liquid type – single phase and two-phase. Single-phase immersion cooling method uses hydrocarbon liquids such as mineral, synthetic or bio oils,, and two-phase method uses fluorocarbon liquids, i.e. fully engineered liquids as a cooling solution.
RSI has partnered with Taisei and Shinohara Electrics to provide a two-phase liquid immersion cooling solution in Japan, enabling customers to significantly reduce data center energy consumption, improve power usage efficiency (PUE) and reduce operating costs and environmental impact.
How does it work?
The entire server is immersed in a liquid immersion tank filled with a special refrigerant with a low boiling point. The special refrigerant boils with the server heat and absorbs the vaporization heat. The condenser cools the refrigerant then the cooled refrigerant is returned to liquid in the tank. A dry cooler cools the water used in the condenser and circulates it. The cooling capacity of 50kW per immersion tank can significantly increase the density of the server compared to the conventional air cooling method.
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