rickman wrote in :

No, cooling in space is very easy. Heat radiates quite well.

True but to get the best of it you have to have high grade energy to radiate.
(High temperatures, short wavelengths). If you could efficiently convert low
grade warmth in large amounts, to a small source of incandescent light, you'd
improve it. I'm not sure if such a process is easy or practical. To be worth
doing, it would have to cost less energy to convert than the difference in
that emitted for the two temperatures. It would probably have to use storage
too, for long slow inputs, short strong bursts of output, which complicates
things.

The problem is that low temperature superconductors are way too cool to start
with, so the supporting equipment would be as awkward as that on Earth, and
likely more so.