Ok, i need some serious help here.... I need to cool air... this is something that involves motorsports, and i want to ask people that have knowledge way beyond me, so i found this forum, hoping someone here can help me... We are running air through a 3 inch diameter pipe... roughly 1800cfm of air... through a steel pipe for around 18 seconds in duration... The air pressurizes to around 50-60psi inside of this pipe. Now, what i would like to know, is there anyway possible to cool this air? Without adding water to it... Is there any sort of a chemical coating we could put on this pipe, or in this pipe to make it cold inside? or any sort of chemical that could be sprayed into it, to make it extremely cold? Right now over that 18 second time period, the air heats up to roughly 350-400 degrees... Is there any way possible to keep it cold? under 100 degrees? Any sort of coating we could put on this piping? or anything at all anyone here can think of? Please let me know if you have any ideas... Thanks in advance!