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Auto-defrost, automatic defrost or self-defrosting is a technique which regularly defrosts the evaporator in a refrigerator or freezer. Appliances using this technique are often called frost free , frostless , or no-frost .
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 ice blocking the vent that allows air into the refrigerator compartment.
Most refrigerator-freezers—except for manual defrost models or cheaper units—use what appears to be two thermostats. Only the refrigerator compartment is properly temperature controlled. When the refrigerator gets too warm, the thermostat starts the cooling process and a fan circulates the air around the freezer.
Kelvinator introduced the first auto-defrost models. [17] [18] Kelvinator refrigerators included shelves on the inside of their doors and special compartments for frozen juice containers in the freezer. [17] It also pioneered the side-by-side refrigerator freezer, the Foodarama series, in the mid-1950s.
The best bottle warmers have safety features like maximum temperature settings and auto shut-off. ... Experts say manual versus digital display features are a matter of personal preference, but ...
Between points 4 and 5, the liquid refrigerant goes through the expansion valve (also called a throttle valve) where its pressure abruptly decreases, causing flash evaporation and auto-refrigeration of, typically, less than half of the liquid. That results in a mixture of liquid and vapour at a lower temperature and pressure as shown at point 5.
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