During evaporation, the liquid-vapour refrigerant absorbs its latent heat of vapourisation from the medium (air, water, brine) which is to be cooled. This heat which is absorbed by the refrigerant is called the refrigeration effect. In other words, the refrigeration effect is the amount of cooling produced.
Refrigeration effect = Enthalpy of vapour refrigerant − Enthalpy of liquid refrigerant.
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