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Domestic
REFRIGERATION
SYSTEMS
Presented by
Binyamin Butt
2015-dt-009
Presented to SIR:
Eng. Mr. Saqib Manzoor
Refrigeration
The term refrigeration may be defined as
the process of removing heat from a
substance under controlled cond...
Contd….
In other words the refrigeration
means a continued extraction of
heat from a body whose temp is
already below the...
Refrigerator & Refrigerant
A refrigerator is a reversed heat engine or
a heat pump which takes out heat from a
cold body &...
Refrigerants use commonly
 Modern refrigerators usually use a
refrigerant called HFC-134a (1,1,1,2-
Tetrafluoroethane), w...
Refrigeration Cycle
In refrigeration system the heat is
being generally pumped from low
level to higher one & rejected at...
Refrigeration Cycle
Refrigeration Systems
• Vapour compression refrigeration system
• Vapour absorption refrigeration system
• Thermo electric...
Every refrigeration cycle
components
• Each cycle of operation consists of the
four fundamental changes of state or
proces...
Components of Vapour
Compression Systems
Vapour
compression
refrigeration
system
Compressor has two main
functions
 1st to maintain the refrigerant
flow within refrigeration cycle
 2nd is to create Pre...
COMPRESSOR
Compressor
The low pressure & temp. refrigerant
from evaporator is drawn into the
compressor through the inlet or suction
...
CONDENSOR has two
main function
the main function is to cool down
refrigerant by putting out the heat
of refrigerant.
Chan...
Condensor
 The condenser or the cooler
consists of coils of pipe in which
the high pressure & temp. vapour
refrigerant is...
Dryer or Receiver has two
main functions
 First is to filter refrigerant.
To eliminate moisture from
refrigerants
Receiver
The condensed liquid refrigerant
from the condenser is stored in a
vessel, known as receiver, from
where it is s...
Dryer or receiver working
 It filters refrigerant with the help
of Filters
 After filters refrigerant moves
toward Silic...
Expansion Valve
 Its main function is to reduce the
pressure of Refrigerant
 For this . It use a small hole , when
refri...
Expansion Valve
Evaporator
& its two main functions
 1st is to absorbs surroundings
heat.
 2nd is to change liquid refrigerant
into vapo...
Evaporator
An evaporator consists of coils of pipes
in which the liquid vapour refrigerant at
low pressure & temp. is eva...
Evaporator
 It absorbs surrounding heat and
starts boiling refrigerant
 It absorbs heat from things (which
is to be cool...
Application of Vapour
Compression Systems
 All refrigerants
single door Refrigerator , double
door refrigerator, window a...
Advantages
• Smaller size for a given refrigerating
capacity
• Higher coeff. of performance
• Lower power requirements for...
Domestic Refrigerator
• The application of refrigeration for
domestic purposes are mainly in the form
of domestic refriger...
Contd….
• It represents a significant portion of the
refrigeration industry due to the use of
these units in large number....
Contd….
The requirement of domestic refrigerator is
that:-
• it should be simple in construction
• automatic in action
• n...
THANKS…..
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Domestic refrigeration system (Condenser. Condensation changes gas to a liquid form. ... Compressor. ... Evaporator. ... Expansion Valve.)

A vapor compression cycle is used in most household refrigerators, refrigerator–freezers and freezers. Newer refrigerators may include automatic defrosting, chilled water, and ice from a dispenser in the door. Domestic refrigerators and freezers for food storage are made in a range of sizes.its includes Condenser. Condensation changes gas to a liquid form. ...
Compressor. ...
Evaporator. ...
Expansion Valve.

  • Sé el primero en comentar

Domestic refrigeration system (Condenser. Condensation changes gas to a liquid form. ... Compressor. ... Evaporator. ... Expansion Valve.)

  1. 1. Domestic REFRIGERATION SYSTEMS Presented by Binyamin Butt 2015-dt-009 Presented to SIR: Eng. Mr. Saqib Manzoor
  2. 2. Refrigeration The term refrigeration may be defined as the process of removing heat from a substance under controlled conditions. It also includes the process of reducing heat & maintaining the temp. of a body below the general temp. of its surroundings.
  3. 3. Contd…. In other words the refrigeration means a continued extraction of heat from a body whose temp is already below the temp. of its surroundings.
  4. 4. Refrigerator & Refrigerant A refrigerator is a reversed heat engine or a heat pump which takes out heat from a cold body & delivers it to a hot body. The refrigerant is a heat carrying medium which during their cycle in a refrigeration system absorbs heat from a low temp. system & delivers it to a higher temp. system.
  5. 5. Refrigerants use commonly  Modern refrigerators usually use a refrigerant called HFC-134a (1,1,1,2- Tetrafluoroethane), which does not deplete the ozone layer, instead of Freon. A R-134a is now becoming very uncommon in Europe. Newer refrigerants are being used instead.
  6. 6. Refrigeration Cycle In refrigeration system the heat is being generally pumped from low level to higher one & rejected at that temp. This rejection of heat from low level to higher level of temp. can only be performed with the help of external work according to second law of thermodynamics.
  7. 7. Refrigeration Cycle
  8. 8. Refrigeration Systems • Vapour compression refrigeration system • Vapour absorption refrigeration system • Thermo electric refrigeration system
  9. 9. Every refrigeration cycle components • Each cycle of operation consists of the four fundamental changes of state or processes:-  Expansion  Evaporator  Compression  Condensation
  10. 10. Components of Vapour Compression Systems
  11. 11. Vapour compression refrigeration system
  12. 12. Compressor has two main functions  1st to maintain the refrigerant flow within refrigeration cycle  2nd is to create Pressure difference within cycle
  13. 13. COMPRESSOR
  14. 14. Compressor The low pressure & temp. refrigerant from evaporator is drawn into the compressor through the inlet or suction valve , where it is compressed to a high pressure & temp. The high pressure & temp vapour refrigerant is discharged into the condenser through the delivery or discharge valve.
  15. 15. CONDENSOR has two main function the main function is to cool down refrigerant by putting out the heat of refrigerant. Change the Vapour refrigerant to liquid refrigerant
  16. 16. Condensor  The condenser or the cooler consists of coils of pipe in which the high pressure & temp. vapour refrigerant is cooled & condensed.  The refrigerant while passing through the condenser, rejects its latent heat to surrounding condensing medium which is normally air or water. Thus hot refrigerant vapour received from compressor is converted into liquid form in condenser.
  17. 17. Dryer or Receiver has two main functions  First is to filter refrigerant. To eliminate moisture from refrigerants
  18. 18. Receiver The condensed liquid refrigerant from the condenser is stored in a vessel, known as receiver, from where it is supplied to the expansion valve or refrigerant control valve.
  19. 19. Dryer or receiver working  It filters refrigerant with the help of Filters  After filters refrigerant moves toward Silica gel which absorbs moisture from refrigerants and send towards expansion device
  20. 20. Expansion Valve  Its main function is to reduce the pressure of Refrigerant  For this . It use a small hole , when refrigerant passes through this hole pressure is reduced due to restriction or resistance  It sends low pressure low temp refrigerant to Evaporator.
  21. 21. Expansion Valve
  22. 22. Evaporator & its two main functions  1st is to absorbs surroundings heat.  2nd is to change liquid refrigerant into vapour refrigerant.
  23. 23. Evaporator An evaporator consists of coils of pipes in which the liquid vapour refrigerant at low pressure & temp. is evaporated & changed into vapour refrigerant at low pressure & temp. During evaporation process, the liquid vapour refrigerant absorbs its latent heat of vaporization from the medium which is to be cooled.
  24. 24. Evaporator  It absorbs surrounding heat and starts boiling refrigerant  It absorbs heat from things (which is to be cooled) places inside of refrigerants.
  25. 25. Application of Vapour Compression Systems  All refrigerants single door Refrigerator , double door refrigerator, window air conditioner, split air conditioner , central air conditioner plant , water cooler , ice candy plant, deepfreezes , cold storage plant
  26. 26. Advantages • Smaller size for a given refrigerating capacity • Higher coeff. of performance • Lower power requirements for a given capacity • Less complexity in both design & operation • It can be used over large of temp.
  27. 27. Domestic Refrigerator • The application of refrigeration for domestic purposes are mainly in the form of domestic refrigerators & home freezers. • The main purpose of this type of refrigeration is to provide low temp. for storage & distribution of foods & drinks.
  28. 28. Contd…. • It represents a significant portion of the refrigeration industry due to the use of these units in large number. • For domestic preservation, the storage is generally short term. The domestic refrigerators used for the purposes are usually small in sizes with rating in ranges from 1/20 to ½ tonne.
  29. 29. Contd…. The requirement of domestic refrigerator is that:- • it should be simple in construction • automatic in action • nominal in initial cost
  30. 30. THANKS…..

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A vapor compression cycle is used in most household refrigerators, refrigerator–freezers and freezers. Newer refrigerators may include automatic defrosting, chilled water, and ice from a dispenser in the door. Domestic refrigerators and freezers for food storage are made in a range of sizes.its includes Condenser. Condensation changes gas to a liquid form. ... Compressor. ... Evaporator. ... Expansion Valve.

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