there is no air or medium for conductive transfer, it's purely radiative. The shuttle used it's very large doors as radiators, as far as I know. The point is th

there is no air or medium for conductive transfer, it's purely radiative. The shuttle used it's very large doors as radiators, as far as I know. The point is that you need a lot more surface area , and that it needs to be unobstructed (since it's literally radiating out, no convention to transfer in cool air/water/medium)