[ryanisnan]

I'm inclined to think you're right, but I can't figure out one thing - the command module (apparently) in Apollo 13 got down to 38F without active heating. That's much colder than standard data centre rack temps.

In the example of a data centre, there would be considerably more heat generation than 3 astronauts, but, I would like to understand more. 38F is cold, so heat is clearly lost not as slowly as we might think.

[xnx]

The Apollo passive radiators can dissipate ~2500 Watts into space. With most systems shut down, only ~500 Watts was coming from the remaining systems and the astronauts bodies.

[ryanisnan]

Cool, thank you. So I read this as fundamentally, the heat they dissipated far exceeded the heat they produced. Do you mind opining on what similar figures would be with modest passive radiators and a typical data centre rack heat output?