Classification of Refrigerants

Refrigerants are classified into two types

1. Primary Refrigerant: These are those refrigerants that take directly part in the refrigeration System.
2. Secondary Refrigerant: These are those refrigerants that are first cooled by primary refrigerant and then they are further used for cooling.

Let's see the classification of different groups of Primary Refrigerants:

• Azetropes: Azetropes group contains a mixture of different refrigerants which do not separate into individual components with the change in pressure and temperature or both.Azetropes have fixed thermodynamics properties
  Example: Refrigerant 500 which contain 73.8% F-12 and 26.2% F-152 
• Halocarbon: These are those refrigerants that contain one or more halogens like Chlorine , bromine and flurine.These kind of refrigerant are commonly used in household and industrial purpose
  Example : CCl₃F (Trichloromonifluoro-methane), CClF₂(DichlorodoFluoro-methane)
• Hydro-Carbons : Many organic compound like ethane ,propane,methane,etc are considered as refrigerant of hydro-carbon group.They are non toxic , no ozone depletion properties and minimal effect on global warming.
• Inorganic Compounds: Inorganic compounds refrigerant are those refrigerant which does not contain carbon hydrogen bonds. Majority of the refrigerant under this group are non toxix, eco -friendly and inexpensive
  Example :NH_{3 ,} H₂O , CO­₂
• Unsaturated Organic Compound : These refrigerant mostly contain hydro carbon
  Example : Ethylene,Propylene