• egerlach@lemmy.ca
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    17 hours ago

    The primary issue is that there’s a limit to how much energy you can get out based on the difference in temperature between the cold fluid (liquid or gas) and the hot fluid. With data centres it’s maybe 20°C? Based on that assumption and the Carnot Theorem you get a maximum work extraction efficiency of about 6-7%.

    Unfortunately, in the data centres they obey the laws of thermodynamics.

    It would work better in places that get colder, but unfortunately places like that don’t tend to have as much available electricity (or infrastructure).

    An aside:

    We are starting to run up against fundamental laws of how much energy is required to do a certain amount of computation. i.e. In order to do a computation that moves a system from a state X to another state Y, there is a minimum amount of entropy change. That entropy change requires a certain amount of energy based on thermodynamics, known as the Landauer Limit.

    We were already only about a billion times less efficient than the limit in 2012. I would wager we’ve improved computation per watt by 1-2 orders of magnitude since then. Which means we might only be 107 or so off of the limit. That sounds like a lot, but when you think about how fast we’re improving…

    • FaceDeer@fedia.io
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      17 hours ago

      Yeah, this is fundamental; if you use a thousand joules of energy to do work (of any kind) you will ultimately end up producing a thousand joules of waste heat. The only choice one has in the matter is where that heat goes.

      This is a major reason why I get annoyed at the people pooh-poohing space-based data centers. It literally puts the waste heat outside the environment. It should be everything that data center opponents say they want.

        • FaceDeer@fedia.io
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          16 hours ago

          That article was incorrect, then. There are many satellites already in orbit that have computers in them - basically all of them do, nowadays - and cooling them is a well understood engineering problem.

          • Trail@lemmy.world
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            14 hours ago

            The satellite computers don’t perform as much work, produce as much heat, or are as densely placed as those in the data centers.

              • bthest@lemmy.world
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                6 hours ago

                Which means they’re not as useful, way more expensive, existing ones can’t be serviced or upgraded and they won’t be able to keep up with induced demand. I.e. they’re not practical. Just because something is theoretically doable doesn’t mean it will actually work for what want it to do.

                Also cooling chips in space is something we had to solve in order to explore and have satellites whereas the lack of AI data centers in an invented problem. There’s no actual need or demand for them.

                Also there’s not enough money (actually money, not imaginary money that our financialized economy makes) to pay for it even it where practical to do. They’re not even able to afford the normal ones lol. Orbit based data centers ain’t happening.

                It’s another Musk grift. It’s a scam.

          • ∟⊔⊤∦∣≶@lemmy.nz
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            14 hours ago

            How was it incorrect? How can you transfer heat away from the electronics into another medium when there is no other medium because it’s in space?

      • Alcoholicorn@mander.xyz
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        16 hours ago

        Space-based data centers are wildly impractical to bordering on not physically possible. The largest feature on the ISS, which you can resolve from earth with a pair of binoculars, is the radiators, and it generates 70 kW. Large data centers use >100MW of electricity. You’d be looking at large fractions of a square mile of just radiators.

        • FaceDeer@fedia.io
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          16 hours ago

          The radiator panels on the ISS are 2,500 square meters in area. The radiator panels are 645 square meters.

          Most of the proposals for space-based data centers have ended up focusing on plans to place thousands of individual satellites into orbit, not just one big space station with everything packed inside it. Scott Manley recently did an analysis of the cooling requirements, he worked through all the numbers and explained how it works, and there really doesn’t seem to be a problem here.