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19.02.2009, 13:24 #1
Cold Technique and Storage-1
Cold Technique and Storage
THE HISTORY OF COLD TECHNIQUE
·The usage of cold (preservation of food by using cold) is an ancient technique.
·The first civilization used cold technique was Chinese in history. They used ice by digging it under ground in winter. They used ice for keeping foods and beverages cold in summer.
·The other civilizations who used ice in the same manner were Greek, Romans and Buyuk Iskender.
·The temperatures under 0°C were obtained by mixing some kind of salt with ice. And this procedure has been known since 16-18 century.
·But the coolers which used refrigeration cycle were invented sooner.
·The first man who invented ice machine of which working principle was based on vacuum was Dr. William Cullen (1755). But it was only used in lab scale. On the other hand the pilot scale ice machine was invented by Jacop Perkins (1834).
Dosya Türü: ppt
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