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→Cyclic refrigeration: another cooling method
Gas cycle systems are similar to vapor compression cycle systems, but use the reverse Rankine cycle. The main functional difference from vapor compression is that the refrigerant remains a gas throughout the entire process. For this reason, a specially formulated refrigerant is not usually needed. Regular [[nitrogen]]-dominant air is usually sufficient. However, this system is also less efficient than vapor compression, and also much larger.<br />
Gas cycle systems are similar to vapor compression cycle systems, but use the reverse Rankine cycle. The main functional difference from vapor compression is that the refrigerant remains a gas throughout the entire process. For this reason, a specially formulated refrigerant is not usually needed. Regular [[nitrogen]]-dominant air is usually sufficient. However, this system is also less efficient than vapor compression, and also much larger.<br />
Gas cycle refrigeration is used in some cases where high-pressure air is readily available, or chemical refrigerants (like ammonia) are considered too dangerous. One place this system is popular in aircraft, since both of these criteria are met.<ref>http://www.brighthubengineering.com/hvac/20589-methods-of-refrigeration-gas-cycle</ref>
Gas cycle refrigeration is used in some cases where high-pressure air is readily available, or chemical refrigerants (like ammonia) are considered too dangerous. One place this system is popular in aircraft, since both of these criteria are met.<ref>http://www.brighthubengineering.com/hvac/20589-methods-of-refrigeration-gas-cycle</ref>
===Vortex tube===
[http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1536&context=iracc]
==Dehumidifiers==
==Dehumidifiers==