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John O | May 2017

Fujitsu turning to liquid immersion cooling for data centers


a recent report by ieee spectrum highlighted the many ways that large companies are trying to cool data centers particularly the decision by fujitsu to implement liquid immersion cooling systems that it believes will bring in the next generation of ultra-dense data centers.

 

fujitsu is exploring immersion cooling systems for data centers.
(wikimedia commons)

 

the report indicated that fujitsu, while not the first company to turn to immersion cooling as a thermal management solution for its data centers, believes that it has the experience to handle new designs and maintenance.

 

“given that liquids are denser than air, fujitsu says that immersing servers in its new system’s bath of inert fluid greatly improves the cooling process and eliminates the need for server fans,” the article continued. “this, in turn, results in a cooling system consuming 40 percent less power compared to that of data centers relying on traditional air-cooling technology. an added bonus is the fanless operation is virtually silent.”

 

another benefit is a reduction in floor space, which is a continuing issue for data center management, as demand for information continues to grow but usable space is becoming harder to come by. fujitsu claims a move to immersion cooling will reduce floor space by 50 percent.

 

the article noted, “a cooling bath measures 90cm x 72cm x 81cm wdh, while the rack it fits into measures 110cm x 78cm x 175cm wdh. the coolant used is an electrically insulating fluorocarbon fluid manufactured by 3m called fluorinert.”

 

the servers are submerged in the liquid and a closed lid prevents evaporation. a coolant distribution unit (cdu) with a pump, heat exchanger, and monitoring module will accept the heat from the fluid and expel it through a water loop and cooling tower before pumping the fluid back into the bath.

 

fujitsu is expecting to ship the immersion cooling system later in 2017.

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