Refrigeration has many applications, including, but not limited to : industrial freezers, household refrigerator , air conditioning and cryogenics .
A refrigeration system is an combination of mechanical equipment in which a refrigerant is circulated for cooling , or extracting heat from bodies or space. A refrigerant having its boiling temperature less than atmospheric temperature will start boiling immediately if subjected to atmospheric conditions, absorbing heat from its surroundings, thereby producing cooling effect .
Refrigeration system could be of two types-:
1. Compression
2. Absorption
Compression system, also sometimes known as mechanical system is the more popular of the two . 
In this figure the compression refrigeration system is shown. This cycle is followed by the compression refrigeration system.
* In this process first , the refrigerant gas is compressed by the compressor and this compressed refrigerant then discharged into the condenser.
* In condenser it is cooled by the atmospheric air or water which is being used for abstracting heat from condenser. Condenser now condensed to liquid.
* Condensed , and warm high pressure refrigerant then travel through the strainer or drier which prevents plugging of the flow control device by tapping scale, dirt and moisture.
* Flow control device controls the flow of refrigerant and refrigerant is trottled.
* Now in the evaporator , refrigerant is subjected to a much lower pressure due to the combined suction of the compressor and the pressure drop across the flow control device.
As a result, refrigerant tends to expand and evaporate thereby cooling the air passing over evaporator. Refrigeration takes place from the absorption of heat during vaporization in the cooling coils. The gas is drawn again into compressor and the cycle is repeated .
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