Although, the idea of preserving food using cool temperatures was very old yet the first known artificial refrigeration(invention of refrigerator) was demonstrated by William Cullen at the University of Glasgow in 1748. Before the invention of the refrigerator, people used to preserve their food by placing them near freshwater lakes or packed with snow, in winters they used ice or icehouses. Natural means are still used to cool foods today.




Refrigeration is the process of removing heat from an enclosed space, or from a substance, to lower its temperature. American inventor Oliver Evans invented the vapor-compression refrigeration machine design in 1805 however he never built any arefrigeration unit. In 1834, Jacob Perkins modified Oliver Evans' original design, building the world's first refrigerator and filing the first legal patent for refrigeration using vapor-compression. The word refrigerator was not existed at that time but in 1800, Thomas Moore first used this word. He designed cedar tub which was covered with rabbit fur and ice. While Moore called it a refrigerator, now it is known as icebox.
   
Steps of Invention   
  •     In 1895 and 1908 ,a French physics teacher "Marcel Audiffen"  designed home refrigerator. Based in his design, the first home refrigerator was made by General Electric in 1911. The fridge was composed of wood.
  •     Later in 1913, refrigerators for home and domestic use were modified by Fred W. Wolf of Fort Wayne, Indiana with models consisting of a unit that was mounted on top of an ice box.
  •     In 1914, engineer Nathaniel B. Wales of Detroit, Michigan, introduced an idea for a practical electric refrigeration unit, which later became the basis for the Kelvinator. 
  •     A self-contained refrigerator, with a compressor on the bottom of the cabinet was invented by Alfred Mellowes in 1916.
  •     In 1918, Kelvinator Company introduced the first refrigerator with any type of automatic control. By 1923, Kelvinator held 80 percent of the market for electric refrigerators.
  •     Home freezers as separate compartments (larger than necessary just for ice cubes), or as separate units, were introduced in the United States in 1940.
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