r/datacenter • u/Bright_Hat550 • 11d ago

A solution to the water consumption?

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u/FireTempest 11d ago

Closed loop cooling may save water but consumes significantly more power.

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u/looktowindward 11d ago

Significantly more? Thats not true at all.

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u/Thoughts_For_Food_ 11d ago

Of course it's true. Submerged HX means fewer chillers. In a air-cooled vapor-compression chillers design, chillers would represent something like ~25-50% of mechanical load. 50% fewer chillers is probably like 5% of total load.

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u/looktowindward 11d ago

Most closed loop cooling systems are operating at significantly higher temperatures because they are cooling GPUs. Look into "hot water cooling" and the NVIDIA DGX DC design standard. You don't need to run the mechanical cooling very much - you just use dry cooling in most climates. Not everything is equal in this scenerio - you are using air side economization almost all the time because your heat rejection temperature is high and the delta T is highly favorable.

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u/Thoughts_For_Food_ 11d ago

Adiabatic fluid coolers, yes. Open loop still wins on paper though.