PPT on Refrigeration brakes by Love Soni

1. Love soni 1

2. Love soni 2

3. REFRIGERATION :
The process of producing and
maintaining the temperature of a
given space or substance below the
surrounding temperature.
Its unit is Tonne (TR).
Love soni 3

4. REFRIGERATION SYSTEM:
The system maintained at the
lower temperature.
Love soni 4

5. APPLICATION OF REFRIGERATION :
1. Domestic,
2. Bakeries,
3. Cold Storages,
4. Dairies & Dairy products,
5. Medical uses,
6. Ice plants,
7. Fish freezing,
8. Hotels and restaurants,
9. Ice cream preparation,
10.Preservation and transportation of fruits,
vegetables etc.
1
2
34
5678
910
Love soni 5

6. METHODS OF REFRIGERATION :
1. Ice refrigeration,
2. Dry ice refrigeration,
3. Evaporative refrigeration,
4. Vapour absorption refrigeration,
5. Vapour compression refrigeration, etc.
Love soni 6

7. VAPOUR COMPRESSIONSYSTEM :
It works on the principle that
evaporation causes cooling.
It consist of four processes :
1. Compression,
2. Condensation,
3. Expansion,
4. Vapourisation.
Love soni 7

8. REFRIGERATION EQIPMENTS :
1. Compressor
2. Condenser
3. Expansion valve4. EvaporatorSAFETY DEVICE
Thermostat Overload protector
Love soni 8

9. REFRIGERANTS :
A refrigerant is a substance or mixture, usually
a fluid, used in a refrigeration cycle.
And also it is used as a medium of heat transfer
through phase change.
Some refrigerants are :
1. R-717 (ammonia),
2. 2. R-22,
3. R-134a (Tetrafluroethene),
4. R-744 (Carbon dioxide),
Love soni 9

10. PROPERTIES OF AN IDEAL REFRIGERANT :
1. High thermal conductivity,
2. Low viscosity,
3. Non-toxic,
4. Non-corrosive to metals,
5. Non-flammable,
6. Non-explosive,
7. No effect on moisture,
8. Low cost and easy availability, etc.
Love soni 10

11. SELECTIONOF REFRIGERANT :
1. Working temperature & pressure range.
2. Toxicity, flammability & corrosiveness.
3. Space limitations.
4. Oil miscibility.
5. Temperature required in the evaporator,
condenser and that of cooling medium available.
Love soni 11

12. ITS WORKING
Love soni 12

13. Love soni 13