What is Defrost System in Household Refrigerators?

The process of removing the ice or frost from the evaporator or freezer is called as defrosting. The automatic controls employed in the present day refrigerators to prevent the formation of frost on the evaporators are called as the defrost systems. The defrost system is found in all the refrigeration systems, household as well as the industrial systems. The refrigeration systems are used to develop temperature below the freezing point temperature of water. When the refrigeration systems works continuously for long periods of time a layer of ice or frost is built around the evaporator coil or the freezer that does not allows the cooling effect from the evaporator to pass into the freezer thus acting as the insulator.