Publish Time: 2023-11-26 Origin: Site
The historical origin of the fridge.
Fridge's development process.
Humans have known from a very early age that food stored at lower temperatures is less prone to spoilage. As early as more than 2000 BC (20th century BC), the ancient inhabitants of the Euphrates and Tigris rivers in Babylon, West Asia, began to build ice in pits to refrigerate meat. In the Shang Dynasty (from the early 17th century BC to the 11th century BC), China also knew how to use ice to preserve food. In the Middle Ages, many countries appeared in many countries to put ice cubes in special water cabinets or stone cabinets to preserve food. Until the 1850s, this kind of Top Freezer Refrigerator was sold in the United States.
The word "fridge" did not enter the American language until the mid-17th century in the West. With the development of the city, the business of ice has gradually developed. It was gradually used by hotels, hotels, hospitals, and some discerning urban merchants for the preservation of meat, fish, and butter. After the American Civil War (1861-1865 AD), ice was used in refrigerated trucks, and also for civilian use. By 1880, half of the Retro Fridge sold in New York, Philadelphia, and Baltimore, and one-third of the fridges sold in Boston and Chicago had entered the home. Similar products also have refrigerators.
Building an efficient fridge is not as easy as we think. In the early 1800s, inventors had a rudimentary understanding of the thermophysical knowledge crucial to refrigeration science. In the West, people believed that the best fridge should prevent the melting of ice, and such a view that was very common at the time was wrong because it was the melting of ice that played the role of refrigeration. Much effort was made in the early days to preserve ice, including wrapping the ice in blankets so that the ice could not perform its function. It wasn't until near the end of the 19th century that inventors succeeded in finding the precise balance of insulation and circulation needed for an efficient fridge.
But back in 1800, an inventive Maryland farmer, Thomas More, found the right way. He owns a farm about 20 miles from Washington, where the village of George Town is the market center. When he was delivering butter to the market with a Bottom Freezer Refrigerator of his design, he found that customers would walk past the rapidly melting butter in competitor buckets and pay him more than the market price for it still fresh, tough, and neatly cut. A pound of butter. Moore says one benefit of his fridge is that farmers don't have to go to the market at night to keep their produce cool.
In 1822, the famous British physicist Faraday discovered that carbon dioxide, ammonia, chlorine, and other gases will turn into liquids under pressurized conditions, and will become gases when the pressure is lowered. In the process of changing from liquid to gas, it will absorb a lot of heat, causing the surrounding temperature to drop rapidly. This discovery by Faraday provided a theoretical basis for later generations to invent artificial refrigeration technologies such as compressors. The first artificial refrigeration compressor was invented by Harrison in 1851. Harrison, the owner of Australia's "Geelong Advertiser", was cleaning type with ether when he found that either had a strong cooling effect on metal. Ether is a liquid with a very low boiling point, which is prone to evaporative endothermic phenomena. Harrison developed a freezer using ether and a 3 Door Refrigerators pressure pump after research and applied it to a winery in Victoria, Australia, for cooling and cooling during winemaking.
In 1873, German chemist and engineer Karl von Linde invented the refrigerator using fluorine as a refrigerant. Linde uses a small steam engine to drive the compression system, so that ammonia is repeatedly compressed and evaporated to produce refrigeration. Linde first applied his invention to the Sedoumar brewery in Wiesbaden, designing and manufacturing an industrial fridge. Later, he improved the industrial fridge. To make it miniaturized, in 1879, the world's first artificially refrigerated household fridge was produced. The steam-powered fridge was quickly put into production, and by 1891, 12,000 units had been sold in Germany and the United States.
The first electric motor to drive the compressor was invented by Swedish engineers Brighton and Mendes in 1923. An American company later bought their patents and in 1925 produced the first household electric fridges. In the first electric fridge, the electric compressor and the refrigerator were separated. The latter is usually placed in the household's underground kiln or storage room and connected to the electric compressor through pipes. Later, the two were combined into one. Before the 1930s, most of the refrigerants used by the fridge were unsafe, such as ether, ammonia, sulfuric acid, etc., were flammable, corrosive, or irritating. Later, I began to search for a safer refrigerant and found Freon. Freon is a non-toxic, non-corrosive, non-flammable fluorine compound. It soon became a refrigerant for various refrigeration equipment and has been used for more than 50 years. But it was found that Freon has a damaging effect on the ozone layer of the earth's atmosphere. So people started looking for new and better refrigerants again.
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