The document discusses refrigeration and refrigeration systems. It defines refrigeration as the process of maintaining the temperature of a space or substance below the surrounding temperature. It then discusses the components of a vapor compression refrigeration system which works by compressing, condensing, expanding, and vaporizing a refrigerant. Finally, it lists common refrigerants used like R-22, R-134a, and ammonia and properties of an ideal refrigerant.

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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).
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4. REFRIGERATION SYSTEM:
The system maintained at the
lower temperature.
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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.
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6. METHODS OF REFRIGERATION :
1. Ice refrigeration,
2. Dry ice refrigeration,
3. Evaporative refrigeration,
4. Vapour absorption refrigeration,
5. Vapour compression refrigeration, etc.
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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.
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8. REFRIGERATION EQIPMENTS :
1. Compressor
2. Condenser
3. Expansion valve4. EvaporatorSAFETY DEVICE
Thermostat Overload protector
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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),
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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.
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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.
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12. ITS WORKING
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