Mid-17th century, the

Dongzhimen Hospital, _ Jia Bin maggia
Mid-17th century, the "refrigerator" the word had entered the American language, and before that, the ice has only just begun to affect the U.S. diet of ordinary citizens. With the development of the city's dealings ice gradually developed. It is gradually being hotels, pubs, hospitals, and by some visionary city dealers in fresh meat, fresh fish and butter. Civil War (1861-1865), as ice was used to refrigerate trucks, but also into the civilian. Prior to 1880, there have been half in New York, Philadelphia and Baltimore selling ice, third in Boston and Chicago started selling refrigerators to enter home use, because a new household appliances - refrigerators - that is the modern refrigerator predecessor, had been invented. There are similar products in the freezer. Making an efficient icebox was not as simple as we thought. Early 19th century, inventors science of refrigeration knowledge is essential to understand the physics of heat is very rudimentary. People think the best refrigerator should prevent the ice from melting, and this one was very common view is clearly wrong, because the ice is melting played a cooling effect. Early people to preserve united refrigeration inc the ice and made a lot of efforts, including wrapping the ice in blankets so that the ice can not play its role. Not until near the 19th century, inventors only succeeded in finding the delicate balance needed an efficient refrigerator insulation and circulation.
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