Comment on datacenter liquid cooling solution

• 51dusty@lemmy.world ⁨8⁩ ⁨months⁩ ago

  yes. I programmed and integrated swap coolers at Amazon data centers. when the cool air hits the hot aisles the humidity goes down.

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  • nokturne213@sopuli.xyz ⁨8⁩ ⁨months⁩ ago

    That is awesome! I had no idea swamp coolers could cool that well. The one in my shop can barely drop the temp 10-15 degrees below outside (on a good day). Sorry for doubting you, so used to people outside of arid climates not knowing what a swamp cooler is.

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    • 51dusty@lemmy.world ⁨8⁩ ⁨months⁩ ago

      10-15 degrees is all you need to keep a “cold aisle” at 85degf, most places, on the worst day.

      IIRC Amazon figured out that individual components could actually run hotter within an acceptable replacement window.

      higher equipment replacement is more than offset by the fact they don’t have to do refrigerant based cooling which makes daily operation ridiculously cheap… no pumps or complicated mechanical devices to produce cooling… no people with special skills to maintain them, etc.

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      • nokturne213@sopuli.xyz ⁨8⁩ ⁨months⁩ ago

        That 10-15 (in my case) relies on no extra heat. When I have game nights IT gets pretty toasty inside with 5 or so extra bodies in the shop.

        My last experience with a server room was in 2002 or 2003, and the rooms were kept in the mid to low 60s.

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• morbidcactus@lemmy.ca ⁨8⁩ ⁨months⁩ ago

  Industrial cooling towers are usually evaporative in my experience, smaller ones are large fans moving air over a stack of slats that the return water is sprayed or piped over and the collects in well for recirculation, larger ones afaik (like what you’d see at power plants) operate the same way. Top ups and water chemistry is all automated.

  Those systems have operation wide cooling loops that individual pieces of equipment tap into, some stuff uses it directly (see that with things like industrial furnaces) but smaller stuff or stuff that’s sensitive you’ll see heat exchangers and even then the server & PLC rooms were all air cooled, the air cons for them were all tied into the cooling water loops though.

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  • 51dusty@lemmy.world ⁨8⁩ ⁨months⁩ ago

    critical data centers use swamp coolers because they don’t have to treat the water or expose it to contamination from outside. they use straight domestic water… super cheap.

    if the conductivity gets too high, they dump the basin and fill with fresh… rinse and repeat.

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• ramielrowe@lemmy.world ⁨8⁩ ⁨months⁩ ago

  Practically all even semi-modern DCs are built for servers themselves to be air cooled. The air itself is cooled via a heat exchanger with a separate and isolated chiller and cooling tower. The isolated chiller is essentially the swamp cooler, but it’s isolated from the servers.

  There are cases where servers are directly liquid cooled, but it’s mostly just the recent Nvidia GPUs and niche things like high-frequency-trading and crypto ASICs.

  All this said… For the longest time I water cooled my home lab’s compute server because I thought it was necessary to reduce noise. But, with proper airflow and a good tower cooler, you can get basically just as quiet. All without the maintenance and risk of water, pumps, tubing, etc.

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  • 51dusty@lemmy.world ⁨8⁩ ⁨months⁩ ago

    a chiller is not a swamp cooler.

    picture a fan with a wet sponge in front of it… that is a swamp cooler.

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    • ramielrowe@lemmy.world ⁨8⁩ ⁨months⁩ ago

      Yea, it’s the combo of the chiller and cooling tower is analogous to a swamp cooler. The cooling tower provides the evaporative cooling. The difference is that rather than directly cooling the environment around the cooling tower, the chiller allows indirect cooling of the DC via heat exchange. And isolated chiller providing heat exchange is why humidity inside the DC isn’t impacted by the evaporative cooling.

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