Also about the radiators - ideally they should radiate into empty space. If there is something in the way, like parts of your station or other radiators, then it will heat up - reducing effectiveness (you will have to remove this heat again) or even making stuff overheat.
At least I don't think you can realistically overheat the Sun. :-)
But I guess if you make the radiators reflective and hot enough they should still work to a even at Earths orbit in full sunlight ? Well, this is already in a "calculation needed" territor.
