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How was ice made in ancient times? ?

The first iced drinks originated in China, where the emperor kept slaves in cellars in winter and kept them in the cellars for the winter. Around the end of the Tang Dynasty, people produced a large amount of nitrates during the production of gunpowder. It was discovered that the saltpeter in the water would absorb a lot of heat and make the water cold to freezing. Since then, people can be in the summer ice. Then there are buyers and sellers who add sugar to the ice to attract customers. In the Song Dynasty, there were more cold foods on the market, and merchants added fruit or juice. Renminbi merchants even add fruit pulp and milk to ice, which is very similar to modern ice cream. The ancient tradition of the cellar. Also known as 'Tibetan Ice'. The summer heat in northern my country freezes in winter, so it is used in winter in the ice cellar for summer use. The origin of this vulgarity is very early, and it is recorded in the 'Book of Songs' and 'The Court and the Government'. Before the Republic of China, ice picking and storage was a privilege of the royal family and nobles. Only the royal family could build ice cellars. These ice cellars are official ice cellars, or official cellars for short. There are two types of ice cellars for the imperial palace and the ice cellars for the official offices of the palace. According to the 'Dai Qing Huidian' records, there were 18 official cellars in Beijing at that time, which were divided into four places: inside the Forbidden City, outside Deshengmen, Jingshan West Gate, and Zhengyangmen. Private ice cellars appeared during the Republic of China. Almost all of them were excavated soil kangs, which were buried in soil after placing ice. Today, there are only three remaining ice cellars in Beijing: the number of ice cellars in the Forbidden City is unknown, two in Xuechi Hutong, and one in Gongjian Hutong, all of which are official cellars, and the private ice cellars are nowhere to be found. In ancient China, there was also a utensil with the same use as refrigerators and electric freezers, called Bingjian. The title of 'Zhou Li·Ling Ren' records: 'Ling people, palm ice...the beginning of spring...the beginning of the spring smelt the mirror...the sacrifice to the ice mirror.' Zheng Xuan's note: 'Jianru (Changing tile) has a big mouth, filled with ice and placed food In order to protect the warm air.' Jia Gongyan Shuyun: 'Ice has a lesson, but the ice will not be released, and the food will stop for a long time.' It can be seen that the ancient utensils used for food refrigeration and preservation were veritable refrigerators or freezers. It really uses ice to preserve food. However, modern refrigerators and electric freezers use electricity to make ice. Although the artifacts like Bingjian can be found in ancient records, few of them have been passed down to later generations.
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