The earliest records of the preservation of ice should be from China. In the late spring and autumn, there is from the "cellar" to take ice, add rice wine to drink records. The so-called "cellar", that is, the icehouse. Because most of China's ancient human settlements are divided into four seasons, the winter lake rivers after ice, people will take ice, and then preserved in the icehouse. To the most hot summer and then remove the use.
The earliest invention of ice-making technology is also China. As early as the Tang Dynasty, there are records of saltpeter ice. Nitrate is the main component of potassium nitrate, potassium nitrate dissolved in water will absorb a lot of heat, when people use this feature to build ice.
The modern air-conditioning refrigeration and ice-making technology, it is derived from the mid-nineteenth century the Americas. At that time a doctor in order to give their own high fever patients with air-conditioning, the use of air expansion will absorb the physical principles of heat, the use of steam engine as the power source, invented the earliest air conditioning. Later, the doctor did not rely on this invention to develop a new industry, but this idea was carried forward by other engineers, another French engineers to develop a more complete chiller. So in the United States during the Civil War, this invention because the north of the southern blockade of ice transport and access to a huge development. Since then, mankind has entered a large-scale refrigeration era.
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