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2. Auto-defrost - Wikipedia

   en.wikipedia.org/wiki/Auto-defrost

   A defrost thermostat opens the heater circuit when the evaporator temperature rises above a preset temperature, 40°F (5°C) or more, thereby preventing excessive heating of the freezer compartment. The defrost timer is such that either the compressor or the defrost heater is on, but not both at the same time.

3. ULT freezer - Wikipedia

   en.wikipedia.org/wiki/ULT_freezer

   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.

4. Cascade refrigeration - Wikipedia

   en.wikipedia.org/wiki/Cascade_refrigeration

   Both types can be used in the same system, generally with the separate cycles being the first stage(s) and the auto-cascade being the last stage. Peltier coolers may also be cascaded into a multi-stage system to achieve lower temperatures. Here, the hot side of the first Peltier cooler is cooled by the cold side of the second Peltier cooler ...

5. Refrigerator - Wikipedia

   en.wikipedia.org/wiki/Refrigerator

   Although both the three- and four-star ratings specify the same storage times and same minimum temperature of −18 °C (0 °F), only a four-star freezer is intended for freezing fresh food, and may include a "fast freeze" function (runs the compressor continually, down to as low as −26 °C (−15 °F)) to facilitate this.

6. Defrosting (refrigeration) - Wikipedia

   en.wikipedia.org/wiki/Defrosting_(refrigeration)

   Furthermore, as the ice builds up it takes increasing space from within the cabinet - reducing the space available for food storage. Many newer units employ automatic defrosting (often called "frost-free" or "no frost") and do not require manual defrosting in normal use. Although, in some cases, users of Frost Free fridge/freezers have noted ...

7. Refrigeration - Wikipedia

   en.wikipedia.org/wiki/Refrigeration

   An 1870 refrigerator car design. Hatches in the roof provided access to the tanks for the storage of harvested ice at each end. Icemaker Patent by Andrew Muhl, dated December 12, 1871. In 1842, John Gorrie created a system capable of refrigerating water to produce ice. Although it was a commercial failure, it inspired scientists and inventors ...