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Name: V. R.
Status: educator
Age: 20s
Location: N/A 
Country: N/A
Date: 10/15/2004

In a refrigerator, the DuPont's Freon (TM) gas which is used for cooling is getting converted to liquid stage before expansion valve. How does this happen and at what pressure and what temperature of DuPont's Freon (TM) gas this happens?

"DuPont's Freon (TM)" is the common name for a class of carbon compounds containing fluorine and other halogens (Cl, Br) and sometimes hydrogen. There are dozens of various substances. They are liquified by compressing the gas at a sufficiently low temperature. The refrigeration properties makes use of the opposite evaporation of liquified freons. Depending upon the application and the desired temperature one or the other of this class of compounds is used. You can find a list of properties of some of the types of freons on the site:

Vince Calder

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