Need to let loose a primal scream without collecting footnotes first? Have a sneer percolating in your system but not enough time/energy to make a whole post about it? Go forth and be mid: Welcome to the Stubsack, your first port of call for learning fresh Awful youāll near-instantly regret.
Any awful.systems sub may be subsneered in this subthread, techtakes or no.
If your sneer seems higher quality than you thought, feel free to cutānāpaste it into its own post ā thereās no quota for posting and the bar really isnāt that high.
The post Xitter web has spawned soo many āesotericā right wing freaks, but thereās no appropriate sneer-space for them. Iām talking redscare-ish, reality challenged āculture criticsā who write about everything but understand nothing. Iām talking about reply-guys who make the same 6 tweets about the same 3 subjects. Theyāre inescapable at this point, yet I donāt see them mocked (as much as they should be)
Like, there was one dude a while back who insisted that women couldnāt be surgeons because they didnāt believe in the moon or in stars? I think each and every one of these guys is uniquely fucked up and if I canāt escape them, I would love to sneer at them.
(Semi-obligatory thanks to @dgerard for starting this)
Youāre entirely right. Any sort of computation in space needs to be fluid-cooled or very sedate. Like, inside the ISS, think of the laptops as actively cooled by the central air system, with the local fan and heatsink merely connecting the laptop to air. Also, theyāre shielded by the āskinā of the station, which youād think is a given, but many spacebros think about unshielded electronics hanging out in the aether like itās a nude beach or something.
Iād imagine that a serious datacenter in space would need to concentrate heat into some sort of battery rather than trying to radiate it off into space. Keep it in one spot, compress it with heat pumps, and extract another round of work from the heat differential. Maybe do it all again until the differential is small enough to safely radiate.
while radiating out waste heat at higher temp would be easier itāll also take up valuable power, and either i donāt get something or youāre trying to break laws of thermodynamics
Iām saying that we shouldnāt radiate if it would be expensive. Itās not easy to force the heat out to the radiators; normally radiation only works because the radiator is more conductive than the rest of the system, and so it tends to pull heat from other components.
We can set up massive convection currents in datacenters on Earth, using air as a fluid. I live in Oregon, where we have a high desert region which enables the following pattern: pull in cold dry air, add water to cool it further and make it more conductive, let it fall into cold rows and rise out of hot rows, condition again to recover water and energy, and exhaust back out to the desert. Apple and Meta have these in Prineville and Google has a campus in The Dalles. If you do the same thing in space, then you end up with a section of looped pipe that has fairly hot convective fluid inside. What to do with it?
Iām merely suggesting that we can reuse that concentrated heat, at reduced efficiency (not breaking thermodynamics), rather than spending extra effort pumping it outside. NASA mentions fluid loops in this catalogue of cooling options for cubesats and I can explain exactly what I mean with Figure 7.13. Note the blue-green transition from āheatā to āheat exchangerā; thatās a differential, and at the sorts of power requirements that a datacenter has, it may well be a significant amount of usable entropy.
okay so you want to put bottoming cycle thermal powerplant on waste heat? am i getting that right?
so now some of that heat is downgraded to lower temperature waste heat, which means you need bigger radiator. you get some extra power, but itād be a miracle if itās anything over 20%. also you need to carry big heat engine up there, and all the time you still have to disperse the same power because it gets put back into the same server racks. this is all conditional on how cold can you keep condenser, but itās pointless for a different reason
youāre not limited by input power (that much), youāre more limited by launch mass and for kilogram more solar panels will get you more power than heat engine + extra radiators. also this introduces lots of moving parts because itād be stirling engine or something like that. also all that expensive silicon runs hot because otherwise you get dogshit efficiency, and thatās probably not extra optimal for reliability. also you can probably get away with moving heat around with heat pipes, no moving parts involved
also you lost me there:
okay this works because water evaporates, cooling down air. this is what every cooling tower does
no it doesnāt (but it doesnāt actually matter)
and here you lost me. i donāt think you can recover water from there at all, and i donāt understand where temperature difference comes from. even if thereās any, itād be tiny and amount of energy recoverable would be purely ornamental. if i get it right, itās just hot wet air being dumped outside, unless somehow server room runs at temperatures below ambient
also iām pretty sure thatās not how it works at all, where did you get it from
and Iām over here like āwhat if we just included a peltier elementā¦ but biggerā and then the satellite comes out covered in noctua fans and RGB light strips
I was also momentarily nerdsniped earlier by looking up the capacity of space power tech[0] (panel yields, battery technology, power density references), but bailed early because itāll actually need some proper spelunking. doubly so because Iām not even nearly an expert on space shit
in case anyone else wants to go dig through that, the idea: for compute you need power (duh). to have power you need to have a source of energy (duh). and for orbitals, youāre either going to be doing loops around the planetoid of your choice, or geostationery. given that youāre playing balancing jenga between at minimum weight, compute capacity, and solar yield, youāre probably going to end up with a design that preferences high-velocity orbitals that have a minimal amount of time in planetoid shadow, which to me implies high chargerate, extremely high cycle count ceiling (supercaps over batteries?), and whatever compute you can make fit and fly on that. combined with whatever the hell you need to do to fit your supposed computational models/delivery in that
this is probably worth a really long essay, because which type of computing your supposed flying spacerack handles is going to be extremely selected by the above constraints. if you could even make your magical spacechip fucking exist in the first place, which is a whole other goddamn problem
[0] - https://www.nasa.gov/smallsat-institute/sst-soa/power-subsystems/ (warning: this can make hours of your day disappear)
dusk-dawn orbit is a thing if you donāt care too hard about where exactly to put it
but itās gonna be so fucking expensive, what theyāre trading off so itās even remotely worth it? do they think itās outside of any jurisdiction?
yeah I thought about that but I took it in light of ādata centerā, i.e. presuming that youād want continuous availability of that. part of what I mean with it being worth a long essay - thereās a couple of ways to configure the hypothetical way this would operate, and each has significant impacts on the shape of the thing
yep. thatās the thing thatās so wild about this fairy picture. option 1) make your entire compute infra earthside[0], launch it all, and get ā¦ the node compute equivalent of 3 stacked raspberry and a 2017 gpu, at a costpoint in the high 4 digits or moreā¦ or option 2, where you just shove a dc full of equipment for the price of like 20 such nodes, and have the compute equivalent of a significant number of mid-range hosters
even if (and this is extreme wand waving) you could crack non-planetbound production for the entire process and fab all this shit in space (incl. the mining and refining and ā¦) as a way to reduce costs, you still have all these other problems too. and itās not like this is likely to happen any time soon
guess they better hope 'ole ray has another vision soon, to get a fixed date for the singularity. canāt see how you do your scrum planning for this fantasy without a target date provided by the singularitian prophet
wait itās all ray kurzweil?
dunno if the aforementioned jazz is (I didnāt check), but rayboi is the easiest āand then compute things just become magically solvedā touchstone for me to remember
too many of the fucking nutjobs to properly track whoās the steering committee for each insane idea