Why does the refrigerator frost?

Update:04 Feb 2020

Refrigerator is a kind of appliance that keeps the temperature low. It keeps food or other things from keeping cold and constant temperature to avoid its spoilage. In ancient refrigerators, tin wraps were hung inside. There were small holes in the bottom of the box. One of the two cover plates was fixed on the mouth of the box. A modern refrigerator has a compressor, an ice maker cabinet or box for freezing, and a storage box with a refrigeration device.

The volume of a domestic refrigerator is usually 20 to 500 liters. In 1910, the world's first compression-type refrigerator for household use came out in the United States. In 1925 the Swedish company Lido developed a household absorption refrigerator. In 1927 General Electric of the United States developed a fully enclosed refrigerator. In 1930, air-cooled continuous diffusion absorption refrigerators with different heating methods were put on the market. In 1931, a new refrigerant Freon was successfully developed. 12. Production of household thermoelectric refrigerators began in the second half of the 1950s, and China began to produce refrigerators in the 1950s.

Humans have known from a very early age that keeping food at lower temperatures is not prone to spoilage. In the Shang Dynasty (early 17th century BC to 11th century BC), China had learned to use ice to keep food cold. The ancient refrigerator, called Bingjian, is recorded in "Zhou Li". "Zhou Li · Tian Guan · Ling Ren" records: "The beginning of the spring, Jianshou Jianshou Jianshou, and all the wine sacrifice is the same. The sacrifices are shared by the ice, and the guests are shared by the ice." "Jiang Ru, big mouth, with ice, food in the middle to protect the warm air." For more than 2000 BC, ancient inhabitants of the Euphrates and Tigris rivers in Babylon, West Asia, have also started to use ice cubes to refrigerate meat. In the Middle Ages, original refrigerators that kept ice cubes in special water cabinets or stone cabinets to preserve food appeared in many countries. Until the 1850s, there were still such refrigerators sold in the United States.

Why frost

Most of the water vapor comes from the air. When people store food and open the refrigerator, the indoor air and the gas in the refrigerator exchange freely, and the humid air in the room quietly enters the refrigerator. Another part of the water vapor comes from the food stored in the refrigerator, such as cleaned vegetables and fruits in fresh-keeping boxes. The water in vegetables and other food evaporates and condenses into frost when it is cold. Especially in summer, the indoor temperature is high, the humidity is high, and the temperature difference between the room temperature and the refrigerator is large. When the refrigerator is opened, a cool air flows from the inside out, and the indoor air is drilled into the refrigerator. Within a few moments, a layer of frost had formed on the surface of the refrigerator. People also find that even if nothing is left in the refrigerator, a thick layer of frost will form in the refrigerator that is often opened, and it can be seen that a large part of the water vapor in the refrigerator comes from the water vapor in the air.

Generally, not only the original low temperature in the freezer room is consumed every time, but sometimes the real-time frost layer thickness is encountered. It is time-consuming and very troublesome to wash with hot water. Disadvantage, the time required to restore the low temperature after defrosting is also long, and it is bound to greatly increase power consumption.

Defrosting method:

Method 1: Before putting frozen food, put a layer of plastic film on the wall of the freezer. It can be easily and quickly applied by the cold air of the freezer, and then put the food into the freezer. When defrosting is needed, quickly move the frozen food into the refrigerated compartment for temporary storage. As long as the plastic film in the freezer is torn off, the frost will be removed quickly, and the shaken film will be applied to continue freezing the food . The time required before and after is only one or two minutes, which saves time, trouble and power.

Method 2: After each defrost, dry the freezer with a towel, and then apply a layer of vegetable oil to the surrounding aluminum wall. When the next frost occurs, it will adhere to the refrigerator wall containing oil, frost and refrigerator wall. The suction between them is greatly reduced, so everyone can easily peel off the clumps without much effort.

Method 3: When defrosting is needed, first cut off the power of the refrigerator, and then use an electric fan or hair dryer to aim at the freezer to the maximum position. After the wind blows, the frost layer will melt very quickly, so when it is removed It's easier.

These three small methods should be the three with the most frequent use and the most obvious effect. It is very easy to operate, so when you are going to defrost the refrigerator in your home, you may wish to try the above small method.