[EMAIL]To maintain a constant temperature refrigeration equipment, but also a food or other items that remain constant cold temperature civilian products. Cabinets with compressors, ice machines for ice cabinet or box, storage box with a refrigeration unit. Household refrigerator volume is usually 20 to 500 liters. In 1910 the world's first compression refrigeration household refrigerators in the United States come out. 1925 Lido Swedish company has developed a household absorption refrigerators. 1927 U.S. General Electric Company developed a fully enclosed refrigerator. 1930 using different heating air-cooled continuous diffusion absorption refrigerators on the market. 1931 successfully developed new refrigerant Freon 12.50 half of the decade began to produce household heat refrigerators, China began producing refrigerators from the 1950s.

Humans already know from a very early time, at lower temperatures to save the food is not easy to corrupt. 2,000 years BC, Babylon the Euphrates and the Tigris, the ancient residents in the pit heaps of ice began to frozen meat. China in the Shang Dynasty (17th century BC started before the 11th century) with ice cooling has also been know to save foods. In the Middle Ages, many countries also appeared put ice on special tanks or stone inside the refrigerator to preserve the original food. Until the 1850s, the United States there is such a refrigerator for sale.

Natural Convection Cooling: also known as direct cooling or frost refrigerators. The freezer compartment directly surrounded by the evaporator, or a freezer compartment evaporator, the other has a refrigerating compartment evaporator, and then the upper part, directly from the evaporator and absorb heat for cooling. Such refrigerators structure is relatively simple, small power consumption, but the temperature invalidity somewhat less use of relatively inconvenient.

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