ITS A PRESENTATION ON REFRIGERATION AND SPECIALLY VAPOUR COMPRESSION REFRIGERATION

2. What is meant
by Refrigeration

3. 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).

4. 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

5.  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.”

6. 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.

7. 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

8. Vapour Compression Refrigeration
Refrigeration cycle
Condenser
Evaporator
High
Pressure
Side
Low
Pressure
Side
Compressor
Expansion
Device
1
2
3
4

9. Main component of vapour compression
refrigeration cycle
1)Evaporator
2)Compressor
3)Condenser
4)Expansion device

11. 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

13. 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

15. 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

17. 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

18. PRESSURE
Throttling
COMPRESSION
EVAPORATION
REFRIGERATION EFFECT WORK DONE
CONDENSER HEAT REJECTION
ENTHALPY
KN/m2
KJ/Kg
Pd
Pe
2
34
1
condensation

19. THANK