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SRI VENKATESHWARA 
COLLEGE OF 
ENGINEERING 
SEMINAR 
ON 
“VAPOUR COMPRESSION REFRIGERATION” 
SUBMITTED TO: SUBMITTED BY: 
MR.SENTHIL KUMAR S.JAGADEESAN
Refrigeration 
 Vapour Compression Refrigeration
Refrigeration 
 Refrigeration is a process of removal of heat from a 
substance at a temperature lower than the 
surrounding with the aid of external work. 
 In a refrigeration system, the rate at which the heat is 
absorbed in a cycle from the interior space to be 
cooled is called Refrigerating Effect.
*In a refrigerator, a medium called Refrigerant 
continuously extracts the heat from the 
refrigerator which is to be kept cool at 
temperatures less than the atmosphere & 
finally rejects to it. 
*Refrigerant acts as a heat exchange medium. 
*e.g.- Ammonia, Freon, Methyl Chloride, Carbon 
dioxide, Isobutane. 
*
Unit of Refrigeration & Ice making 
Capacity 
 The capacity of a refrigeration system is expressed in 
tons of refrigeration which is the unit of refrigeration. 
 A ton of refrigeration is the quantity of heat absorbed 
in order to form one ton of ice in 24 hours when the 
initial temperature of water is 0°c. 
 1 Ton of Refrigeration = 210 kJ/min = 3.5kW 
 Ice making capacity is the capacity of the refrigerating 
system to make ice beginning from water to solid. 
 S.I. unit of ice making capacity is kg/hr.
The coefficient of performance(briefly written as C.O.P.) 
is the ratio of desired effect to the work input. 
Mathematically, 
(C.O.P.)refrigerator = Desired effect = Q2____ 
Work Input Q1-Q2 
Coefficient of 
Performance
T1=Tsurr 
Source T1 
Heat Rejected, Q1 
R Work Input,W=Q1-Q2 
Heat Absorbed, Q2 
T2<Tsurr 
Sink T2 
Refrigerator 
Refrigerator is a 
reversed heat engine. 
It extracts Q2 amount of 
heat from sink & releases 
Q1 amount of heat to 
source. 
Input—Work(Q1-Q2) 
Output– Heat
PARTS OF REFRIGERATOR 
Parts of 
Refrigerator 
Evaporator Compressor Condenser 
Expansion 
Valve
Types of Refrigeration 
System 
Refrigeration 
System 
Vapour 
Compression 
Refrigeration 
System 
Vapour 
Absorption 
Refrigeration 
System
11 
Type of Refrigeration 
Vapour Compression Refrigeration 
Refrigeration cycle 
Condenser 
Evaporator 
High 
Pressure 
Side 
Low 
Pressure 
Side 
Compressor 
Expansion 
Device 
1 
2 
3 
4
12 
Type of Refrigeration 
Low pressure liquid refrigerant in 
evaporator absorbs heat and 
changes to a gas 
Vapour Compression Refrigeration 
Refrigeration cycle 
Condenser 
Evaporator 
High 
Pressure 
Side 
Low 
Pressure 
Side 
Compressor 
Expansion 
Device 
1 
2 
3 
4
13 
Type of Refrigeration 
The superheated vapour enters the 
compressor where its pressure is 
raised 
Vapour Compression Refrigeration 
Refrigeration cycle 
Condenser 
Evaporator 
High 
Pressure 
Side 
Low 
Pressure 
Side 
Compressor 
Expansion 
Device 
1 
2 
3 
4
14 
Type of Refrigeration 
The high pressure superheated gas 
is cooled in several stages in the 
condenser 
Vapour Compression Refrigeration 
Refrigeration cycle 
Condenser 
Evaporator 
High 
Pressure 
Side 
Low 
Pressure 
Side 
Compressor 
Expansion 
Device 
1 
2 
3 
4
15 
Type of Refrigeration 
Liquid passes through expansion device, 
which reduces its pressure and controls the 
flow into the evaporator 
Vapour Compression Refrigeration 
Refrigeration cycle 
Condenser 
Evaporator 
High 
Pressure 
Side 
Low 
Pressure 
Side 
Compressor 
Expansion 
Device 
1 
2 
3 
4
Advantages 
 Very mature technology. 
 It has very less running cost. 
 It has smaller size for the given capacity of refrigeration. 
 It can be employed over a large range of temperatures. 
 The C.O.P. is very high. 
Disadvantages 
 Many systems still use HCFC refrigerants, which contribute 
to depletion of ozone layer. 
 Initial cost is high. 
 The prevention of leakage of refrigerant is the major 
problem in vapour compression refrigeration. 
16
17 
Seminar 
on 
“Vapour Compression 
 
Refrigeration” 
THANK YOU 
FOR YOUR ATTENTION

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Vapourcompressionrefrigeration 140614054320-phpapp02 (1)

  • 1. SRI VENKATESHWARA COLLEGE OF ENGINEERING SEMINAR ON “VAPOUR COMPRESSION REFRIGERATION” SUBMITTED TO: SUBMITTED BY: MR.SENTHIL KUMAR S.JAGADEESAN
  • 2. Refrigeration  Vapour Compression Refrigeration
  • 3. Refrigeration  Refrigeration is a process of removal of heat from a substance at a temperature lower than the surrounding with the aid of external work.  In a refrigeration system, the rate at which the heat is absorbed in a cycle from the interior space to be cooled is called Refrigerating Effect.
  • 4. *In a refrigerator, a medium called Refrigerant continuously extracts the heat from the refrigerator which is to be kept cool at temperatures less than the atmosphere & finally rejects to it. *Refrigerant acts as a heat exchange medium. *e.g.- Ammonia, Freon, Methyl Chloride, Carbon dioxide, Isobutane. *
  • 5. Unit of Refrigeration & Ice making Capacity  The capacity of a refrigeration system is expressed in tons of refrigeration which is the unit of refrigeration.  A ton of refrigeration is the quantity of heat absorbed in order to form one ton of ice in 24 hours when the initial temperature of water is 0°c.  1 Ton of Refrigeration = 210 kJ/min = 3.5kW  Ice making capacity is the capacity of the refrigerating system to make ice beginning from water to solid.  S.I. unit of ice making capacity is kg/hr.
  • 6. The coefficient of performance(briefly written as C.O.P.) is the ratio of desired effect to the work input. Mathematically, (C.O.P.)refrigerator = Desired effect = Q2____ Work Input Q1-Q2 Coefficient of Performance
  • 7. T1=Tsurr Source T1 Heat Rejected, Q1 R Work Input,W=Q1-Q2 Heat Absorbed, Q2 T2<Tsurr Sink T2 Refrigerator Refrigerator is a reversed heat engine. It extracts Q2 amount of heat from sink & releases Q1 amount of heat to source. Input—Work(Q1-Q2) Output– Heat
  • 8. PARTS OF REFRIGERATOR Parts of Refrigerator Evaporator Compressor Condenser Expansion Valve
  • 9. Types of Refrigeration System Refrigeration System Vapour Compression Refrigeration System Vapour Absorption Refrigeration System
  • 10. 11 Type of Refrigeration Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  • 11. 12 Type of Refrigeration Low pressure liquid refrigerant in evaporator absorbs heat and changes to a gas Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  • 12. 13 Type of Refrigeration The superheated vapour enters the compressor where its pressure is raised Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  • 13. 14 Type of Refrigeration The high pressure superheated gas is cooled in several stages in the condenser Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  • 14. 15 Type of Refrigeration Liquid passes through expansion device, which reduces its pressure and controls the flow into the evaporator Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
  • 15. Advantages  Very mature technology.  It has very less running cost.  It has smaller size for the given capacity of refrigeration.  It can be employed over a large range of temperatures.  The C.O.P. is very high. Disadvantages  Many systems still use HCFC refrigerants, which contribute to depletion of ozone layer.  Initial cost is high.  The prevention of leakage of refrigerant is the major problem in vapour compression refrigeration. 16
  • 16. 17 Seminar on “Vapour Compression  Refrigeration” THANK YOU FOR YOUR ATTENTION