Lets say I had a thermos full of liquid nitrogen. Lets also say I wanted to pump it through a hose. What kind of hose and pump would I need? Also, what material should the radiator be made out of? Figure I'd just whatever recommended hose and fit the heat exchanger end of it with a bunch of iron fins. But since its so cold, I suppose I really don't need a heat exchanger... just a pressure release for when it decides to become a gas.