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===Vortex tube===
===Vortex tube===
[[File:Ranque-Hilsch Vortex Tube.png|thumbnail|300px|Ranque-Hilsch Vortex Tub diagram]]
[[File:Ranque-Hilsch Vortex Tube.png|thumbnail|300px|Ranque-Hilsch Vortex Tub diagram]]
Vortex tube cooling requires high pressure air to be forced through the vortex spin chamber. It rotates first through the outer section of the tube (at about 1,000,000 RPM), then some escapes through a control valve at the far end. The remaining air is sent back through the chamber, now on the inner area. This returning air releases some of it's energy in the form of heat, which goes into the outer, hotter stream. The now-cold inner stream exits at the same end it entered, where it can be put to use while the hot air from the far end is ejected.<ref>http://www.exair.com/en-US/Primary%20Navigation/Products/Vortex%20Tubes%20and%20Spot%20Cooling/Vortex%20Tubes/Pages/How%20a%20Vortex%20Tube%20Works.aspx</ref><br />
Vortex tube cooling requires high pressure air to be forced through the vortex spin chamber. It rotates first through the outer section of the tube (at about 1,000,000 RPM), then some escapes through a control valve at the far end. The remaining air is sent back through the chamber, now in the inner portion. This returning air releases some of it's energy in the form of heat, which goes into the outer, hotter stream. The now-cold inner stream exits at the same end it entered, where it can be put to use while the hot air from the far end is ejected.<ref>http://www.exair.com/en-US/Primary%20Navigation/Products/Vortex%20Tubes%20and%20Spot%20Cooling/Vortex%20Tubes/Pages/How%20a%20Vortex%20Tube%20Works.aspx</ref><br />
Vortex tube cooling has not proven an efficient cooling method as of yet, but could still be used, especially as an addition to another system.<ref>http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1536&context=iracc</ref>
Vortex tube cooling has not proven an efficient cooling method as of yet, but could still be used, especially as an addition to another system.<ref>http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1536&context=iracc</ref>