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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 ideal temperature for freezers is 0º Fahrenheit. Freezers are one of the most helpful kitchen appliances of all time. The freezing point for water and many foods is 32º Fahrenheit, so you ...
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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ANSI/ASHRAE Standard 55 provides a table of metabolic rate of different continuous activities. These values are valid for an average adult with surface skin area of 1.8 m 2 (19.6 ft 2). The standard reminds the users that they should use their own judgment to match the activities being considered to the comparable activities in the table.