You need to think about how an infrared laser works. You’re taking electricity, converting it into light and then focusing the light.
So you’d need to take the heat from your GPUs, inefficiently convert it into electricity (a lot of it would remain as heat), then inefficiently convert electricity into light (much of the electricity would turn back into heat in this process) and then focus the light away from the space data centre.
Now, we already have a process for moving heat away from things as infrared light, without going through all those steps (which would just reduce the efficiency of the process). It’s called a radiator, and it’s how we cool things in space. That’s literally where the name comes from; they radiate heat away as infrared light. That’s why hot things glow in thermal cameras.
It is incredibly inefficient. Radiation (ie, infrared light) is, by far, the worst way of cooling things. But in space its the only option you have, because there’s no convection or conduction across vacuum.
A top end GPU puts out about 1,000 watts of waste heat. The entire International Space Station has enough cooling for 14 of those, if it was doing nothing else whatsoever. An average server rack contains 72. The ISS cost $100 billion dollars. So at a minimum you’re looking at around $500 billion to put one single server rack in space. And that’s before accounting for the heat from the sun, which we can’t avoid because we need solar power to run this thing. So probably closer to a trillion. In other words, twice the already ludicrous price tag of Sam Altman’s “Stargate” project. For a single server rack.
Hmm, this has me thinking about the stealth ships in The Expanse. The engineering needed to make it work makes me want to cry, but in principle you could run a Peltier cooler with a swappable heat sink.
To be clear, I don’t think this is a viable option, but it’s interesting to think about.
Basically the way you would make a stealth spaceship would be by focusing as much as possible on energy efficiency. At every juncture you would try to use as little power as possible, and use every bit of it as efficiently as possible, so that you’re not remitting waste. That waste, in the form of heat, radio waves, etc, is what gets you spotted.
You could also run heatsinks temporarily for enhanced stealth as you suggest, then open up radiators to cool them - or eject them - once it’s safe to do so.
(For the Elite: Dangerous players, yes, that game got it right.)
The entire ISS has 14GW of cooling (and a lot of that just goes towards keeping the sun from cooking it). A single server rack can produce around 72GW of heat.
The ISS cost about $100 billion.
Basically, if you took the entire budget of Sam Altman’s “Stargate” project (money that, to be clear, he does not have and will not get) and put it into space data centres you might, optimistically, put one rack in space.
Most data centres have dozens to hundreds.
You’re absolutely correct, but “quite big” might be the single biggest understatement I’ve seen in my life.
I don’t know if it would work but… Could an infrared laser expel enough heat?
You need to think about how an infrared laser works. You’re taking electricity, converting it into light and then focusing the light.
So you’d need to take the heat from your GPUs, inefficiently convert it into electricity (a lot of it would remain as heat), then inefficiently convert electricity into light (much of the electricity would turn back into heat in this process) and then focus the light away from the space data centre.
Now, we already have a process for moving heat away from things as infrared light, without going through all those steps (which would just reduce the efficiency of the process). It’s called a radiator, and it’s how we cool things in space. That’s literally where the name comes from; they radiate heat away as infrared light. That’s why hot things glow in thermal cameras.
It is incredibly inefficient. Radiation (ie, infrared light) is, by far, the worst way of cooling things. But in space its the only option you have, because there’s no convection or conduction across vacuum.
A top end GPU puts out about 1,000 watts of waste heat. The entire International Space Station has enough cooling for 14 of those, if it was doing nothing else whatsoever. An average server rack contains 72. The ISS cost $100 billion dollars. So at a minimum you’re looking at around $500 billion to put one single server rack in space. And that’s before accounting for the heat from the sun, which we can’t avoid because we need solar power to run this thing. So probably closer to a trillion. In other words, twice the already ludicrous price tag of Sam Altman’s “Stargate” project. For a single server rack.
Hmm, this has me thinking about the stealth ships in The Expanse. The engineering needed to make it work makes me want to cry, but in principle you could run a Peltier cooler with a swappable heat sink.
To be clear, I don’t think this is a viable option, but it’s interesting to think about.
Basically the way you would make a stealth spaceship would be by focusing as much as possible on energy efficiency. At every juncture you would try to use as little power as possible, and use every bit of it as efficiently as possible, so that you’re not remitting waste. That waste, in the form of heat, radio waves, etc, is what gets you spotted.
You could also run heatsinks temporarily for enhanced stealth as you suggest, then open up radiators to cool them - or eject them - once it’s safe to do so.
(For the Elite: Dangerous players, yes, that game got it right.)
You could cool them through radiative panels but you would need quite big panels to radiate away the heat a data center produces.
The entire ISS has 14GW of cooling (and a lot of that just goes towards keeping the sun from cooking it). A single server rack can produce around 72GW of heat.
The ISS cost about $100 billion.
Basically, if you took the entire budget of Sam Altman’s “Stargate” project (money that, to be clear, he does not have and will not get) and put it into space data centres you might, optimistically, put one rack in space.
Most data centres have dozens to hundreds.
You’re absolutely correct, but “quite big” might be the single biggest understatement I’ve seen in my life.