EMC2, I was trying to put as many absurd things in there as possible. Just in case anyone thought I was serious....
1) You cannot go below 0K.
2) Air wouldn't be air at really temperatures even near that low, as it starts liquifying C02 at near -50C, nitrogen at near -190C, etc...
3) Water can't sublimate. Only ice can.
4) A closed loop system would not benefit from sublimation, because there is no air to sublimate it to (excluding the possibility of water-based phase change cooling).
5) YOU CANNOT DESTROY HEAT.
6) Why would I be referencing THG if I was serious?