The idea of using a low temperature to keep food is old and returned to several centuries, but the form of modern refrigerator is the product of a series of innovations by chemists, engineers and inventors over two decades and specifically in the second century The first attempts to save food: Human hands know that the temperature is unable to save food for a long time as well as other ways such as armaments and drying but these methods were not effective for all foods. Before the mechanical refrigerators become frightening, some were used tightly isolated rooms called snow rooms where snow and ice are used as a natural coolers.
This method appeared in the second millennium BC in Asia and Europe, although the name of the engineer The first refrigerator: Ice rooms in modern times are also especially used in isolated and electrician rural areas, at the beginning of the eighteenth century, the American engineer Thomas Moore is home from the snowy rooms and is an isolated room and In 1750, Scottish physics world found that some chemical reactions could absorb heat from a given pocket place (Pocket of Cold).
Colin was not aware of practical applications for scientific discovery and that it would become the basic principle of modern refrigerators.
At the same time, THOMAS MOORE, the ice box, Oliver Evans, has been designed (not made but only designed) a device to exploit the chemical principle that I discovered by William Cologne, and the order remained so even Ten years, the American physicist sought to search for a steady source for snow to reduce the temperature of yellow fever.
The method used at the time was not enough for the purpose and from Oliver Evans designs The method of working refrigerator: The mechanical cooling system depends on chemicals called refrigerants (refrigerants), when chemicals pass through the device, they are pressed (become compressed), resulting in high temperature, freed of this heat When the heat is avoided, the chemical radiator is intensified and maintains its high pressure and then passes on the extension device.
The liquid is adjusted and the fluid turns into a gas and reduces the temperature and cold, then the fans are then published by the cold air inside the part The first refrigerator was used as a chemical liquid, but in 1876, CARL Von Linden was improved for gas liquid (gas conversion to liquid), which was revolutionized in the refrigerator industry.
However, there are several problems in the old designs, where they were used in the first refrigerators such as ammonia, sulfur and methyl chloride, and sometimes leaks in the gas chamber, leading to fatal incidents in the early 20th century. But chlorofluorocarbon compounds were not the most effective solution in 1970.
Scientists discovered that they contributed significantly to the damage to the ozone layer. The use of such vehicles and compensated with less environmental damage and more effective chemicals.
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