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It is recommended to use this feature several hours before adding more than 1 kg of unfrozen food to the freezer. For freezers without this feature, lowering the temperature setting to the coldest will have the same effect. Freezer Defrost: Early freezer units accumulated ice crystals around the freezing units. This was a result of humidity ...
The temperature of the freezer contents rises during the defrosting cycles, especially if there is a light load in the freezer. This can cause "freezer burn" on articles placed in the freezer, from partially defrosting, then re-freezing; On hot, humid days condensation will sometimes form around the refrigerator doors.
An ultra low temperature (ULT) freezer is a refrigerator that stores contents at −80 to −86 °C (−112 to −123 °F). [1] An ultra low temperature freezer is commonly referred to as a "minus 80 freezer" or a "negative 80 freezer", referring to the most common temperature standard. [ 2 ]
However, the freezer compartment of this type is not recommended to store vaccines, and vaccines should be stored centrally inside the refrigerator. Many combination units cool the refrigerator using air from the freezer, resulting in different temperature zones inside the fridge. [7]
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Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2]