Refrigeration

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ITS A PRESENTATION ON REFRIGERATION
AND SPECIALLY VAPOUR COMPRESSION REFRIGERATION

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Refrigeration

  1. 1. What is meant by Refrigeration
  2. 2. Principle of refrigeration  In refrigeration , the heat is removed continuously from a system or space at a lower temperature and transfer to the surrounding at higher temperature In this process ,according to second law of thermodynamics ,external work is required to convey the heat from cold body to hot body(surrounding).
  3. 3. The refrigerant is a heat carrying medium which absorbs heat from space(desired to cool) and rejects heat to outside the refrigerator (in atmosphere) The refrigerant is a working medium goes various processes of refrigeration cycles which are used to produce refrigeration NH3, CO2, Air, R11( Trichloro – monofluoro methane), R12(Dichloro – difluro methane), R22(Monochloro – difluoro methane), Types of refrigerants commonly used in practice
  4. 4.  Refrigeration effect is the amount of heat absorbed by refrigerant from the space to be cooled  The capacity of refrigeration system is expressed in Tons of refrigeration which is called a unit of refrigeration  A ton of refrigeration is defined as “the refrigeration effect produced by melting of 1 ton of ice from and at 0 C in 24 hours.”
  5. 5. 4)Manufacturing of ice, rubber products, explosives, textiles, etc. 3) Comfort air conditioning of auditoriums, hospitals, residence, office, factories, etc. 5) Cooling water. 2)Processing of petroleum and other chemical products. 1) Preservation of medicines and syrups.
  6. 6. I. Natural refrigerator II.Mechanical refrigerator  Mechanical refrigerator is further classified as a)Air refrigerator b)Vapour absorption refrigerator c)Vapour compression refrigerator  The refrigerator can be classified as follow
  7. 7. Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  8. 8. Main component of vapour compression refrigeration cycle 1)Evaporator 2)Compressor 3)Condenser 4)Expansion device
  9. 9. Low pressure liquid refrigerant in evaporator absorbs heat and changes to a gas Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  10. 10. The vapour enters the compressor where its pressure is raised Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  11. 11. The high pressure superheated gas is cooled in several stages in the condenser Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  12. 12. Liquid passes through expansion device, which reduces its pressure and controls the flow into the evaporator Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  13. 13. PRESSURE Throttling COMPRESSION EVAPORATION REFRIGERATION EFFECT WORK DONE CONDENSER HEAT REJECTION ENTHALPY KN/m2 KJ/Kg Pd Pe 2 34 1 condensation
  14. 14. THANK

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