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In order to know the functional principles of refrigerators we should introduce different types of refrigerants, compressors, condensers, and evaporators.

The main parts of refrigerator cooling system are: Metal intervening coils on the back of refrigerator (condenser or radiator), Cooling container, freezer compartment or ice maker (evaporator), Engine (compressor), Other pipes and tubes of the refrigerator

In the past when electricity was not available in some regions, ammonia gas was used for cooling the inside of refrigerators.

Now let’s review how refrigerators work: When the compressor of refrigerator starts working, the cooled gas in compressor and circuit is sent to the evaporator container (freezer compartment) with pressure.

When warm air passes by a cold object, the air in contact with the cold object loses its humidity a little in the shape of water drops.

No Frost refrigerators are designed in a way that they will never frost.