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A defrost timer taken out of a household refrigerator. The defrost mechanism in a refrigerator heats the cooling element (evaporator coil) for a short period of time and melts the frost that has formed on it. [1] The resulting water drains through a duct at the back of the unit. Defrosting is controlled by an electric or electronic timer.
In refrigerators, defrosting (or thawing) is the removal of frost and ice. A defrosting procedure is generally performed periodically on refrigerators and freezers to maintain their operating efficiency. Over time, as the door is opened and closed, letting in new air, water vapour from the air condenses on the cooling elements within the cabinet.
In cheaper and/or older models, a defrost cycle is controlled via a mechanical timer. This timer is set to shut off the compressor and fan and energize a heating element located near or around the evaporator for about 15 to 30 minutes at every 6 to 12 hours. This melts any frost or ice build-up and allows the refrigerator to work normally once ...
Why does this simple combo work? Turns out, rubbing alcohol has a much lower freezing point than water (128°F below 0), so it speeds up the melting process and prevents the surface from icing up ...
The defrost system in freezers helps the equipment to perform properly, without thick layers of ice developing, thus preventing the evaporator coil from absorbing heat and cooling the cabinet. Ideally, most frozen foods should be defrosted in a refrigerator to avoid significant growth of pathogens. However, this can require considerable time.
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The container of hotter liquid may melt through a layer of frost that is acting as an insulator under the container (frost is an insulator, as mentioned above), allowing the container to come into direct contact with a much colder lower layer that the frost formed on (ice, refrigeration coils, etc.)
The Greenland ice sheet has lost about 1,965 square miles to glacial retreat since 1985, a new study says.