Principles of Refrigeration

  • The principle of heat transfer, evaporation and condensation are applied in refrigeration. Figure illustrates the basic components and operating cycles of a refrigerator.
  • Cold liquid refrigerant is evaporated in an evaporator coil which, being colder than its surroundings draws heat from them to latent heat of vaporization.
  • The cool vapour is drawn off by a compressor which rises both the pressure and temperature of the vapour and passes it to condenser.
  • The pressure of the vapour having been increased, the vapour now has a temperature of condensation substantially greater than the temp of the condenser coolant liquid.
  • The vapour is condensed to a high pressure liquid and the sensible heat of desuper heating  the vapour together with intent heat of condensation is removed via the condenser coolant which is warmed up in the process.
  • The high pressure liquid then passes through a expansion valve to the low pressure side of the refrigerator and, in doing so, flash evaporates to a two-phase mixture of cold liquid and vapour.
  • The mixture then passes to the evaporator to continue the cycle.

About the Author 
Mr.Vineeth Moozhikkara He is a marine engineer sailing with British Petroleum.He has keen interest on compiling marine exam notes.Catch him on Facebook.

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