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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] ULT freezers come in upright and chest freezer formats.
In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. The evaporation-condensation temperatures of each cycle are sequentially lower with some overlap to cover the total temperature drop desired, with refrigerants selected to work efficiently in the temperature range they cover.
The natural temperature range of Kelvin; 0: N/A: ... Typical temperature of a ULT freezer; 194.6 K: ... Typical temperature of a household freezer [34] 256 K
The correct temperature for your freezer is 0 degrees Fahrenheit—if you set it to 0 degrees (-18 degrees Celsius) and keep it fairly full, it will maintain that temperature.
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Critical temperature in degrees Celsius; Absolute critical pressure in kilopascals; Since over 100,000 refrigerant blends are possible, [2] this list should only have notable refrigerants and refrigerant blends.
Part ULT Alternative Rules for Pressure Vessels Constructed of Materials Having Higher Allowable Stresses at Low Temperature; General: ULT-1 through to ULT-5; Design: ULT-16 through to ULT-57; Fabrication: ULT-76 through to ULT-86; Inspection and Tests: ULT-90 through to ULT-100; Marking and Reports: ULT-115; Pressure Relief Devices: ULT-125