Kitchen single door refrigerator

Humans have known for a long time that food preserved at lower temperatures is less prone to spoilage. In 2000 BC, the ancient inhabitants of Babylon's Euphrates and Tigris rivers in western Asia began to freeze their meat by storing ice in pits. China also knew how to use ice to store the shang dynasty (the 11th century before the 17th century BC). In the middle ages, many countries had original refrigerators, where ice cubes were kept in special tanks or stone cabinets to preserve food. They were sold in the United States until the 1950s.

In 1822, the famous British physicist Faraday discovered that carbon dioxide, ammonia, chlorine and other gases turn into liquids under pressure and into gases when the pressure drops. During the process from liquid to gas, a lot of heat is absorbed, so the surrounding temperature drops rapidly. Faraday's discovery provided the theoretical basis for the invention of artificial refrigeration technologies such as compressors. The artificial refrigeration compressor was invented by harrison in 1851. Harrison is the owner of keelung advertising in Australia. When he cleaned the lead with ether, he found that the ether coating had a strong cooling effect on the metal. Ether is a liquid with a very low boiling point, which tends to produce evaporation and absorb heat. Harrison developed and produced a freezer using ether and a refrigerator pressure pump and applied it to a winery in Victoria, Australia, for cooling and cooling.