Freezing Technology

3.2.3. Latent heat of vaporization

                A refrigerant should have a high latent heat of vapour at the evaporator temperature.  It results in high refrigerating effect per kg of refrigerant and which reduces the mass of refrigerant to be circulated per ton of refrigerants.

 

Refrigerant	Latent heat of vapour at 15ºC (Kcal/kg)
R-12 (CCl2F2)	37.97
R-717 (NH4)	314.42
R.744 (CO2)	65.44
R-764 (SO2)	94.27

                                                                                  

     Specific volume 

  It indicates the theorentional displacement of the compressor (i.e volume of suction vapour to compressor).