Re: Why super-cooled fuel?
"Cold LOX can't take advantage of evaporative cooling to stay at that temperature,"
It can, but you need to be evaporating liquid nitrogen to do it - and given the stated temperature of the LOX, that's most likely what they're using to superchill it. Elon doesn't like doing engineering using experimental techniques whilst LN2 cooling is well-proven as is the materials technology for handling at this lower temperature.
http://www.engineeringtoolbox.com/boiling-points-fluids-gases-d_155.html says LOX boils at -183, LN2 at -196
Biting the hand that feeds IT
