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Refrigerator and freezer

Refrigerator and freezer are common houseold appliances. The first one consists of a thermally insulated compartment and a heat pump that transfers heat from the inside of the fridge to its external environment so that the inside of the fridge is cooled to a temperature below the ambient temperature of the room; optimum temperature range for perishable food storage is 3 to 5 °C.
Freezers are used also in industry and commerce and they mantain temperatures from -23 to -18 °C; Domestic freezers can be included as a separate compartment in a refrigerator, or can be a separate appliance.
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