[Er.Pankaj Garg]

Refrigerant in Refrigeration
Chemical Refrigerant A refrigerant is a compound used in a heat cycle that undergoes a phase change from a gas to a liquid and back. The two main uses of refrigerants are refrigerators/freezers and air conditioners.

Refrigerant Properties: 
Special Thermodynamic qualities such as suitable

• boiling point (somewhat below the target temperature),
  
• high heat of vaporization, moderate density in liquid form,
  
• high density in gaseous form,
  
• Non-corrosive,
  
• Non-toxic and safe.
  

Refrigerant Examples: – 

•Ammonia (boiling point: -33ºC)  
•Freon 12 (R-12) (boiling point: -30ºC) 
•Freon 22 (R-22) (boiling point: -40ºC) 
•Dry ice (CO2) (boiling point: -73ºC) 
•CFC (chlorofluorocarbon) 
•HCFC(hydrochlorofluorocarbon) 
•HFC (hydrofluorocarbon)

Currently most widely used Refrigerants:

R-134a (CH2FCF3, boiling point: -26ºC)

R-410a (50% CH2F2/50%CHFCF3, boiling point: -48ºC)

To Read More... http://frontdesk.co.in/building-services...ditioning/