&Nbsp&Nbsp&Nbsp; The refrigerator is equipped with an insulation chamber and a heat pump to cool the interior of the refrigerator to a temperature lower than the ambient temperature of the room where heat is transferred (mechanically, electronically, or chemically) from the refrigerator to its external environment. Refrigeration is an essential food storage technology in developed countries. Lower temperatures will reduce the reproduction rate of bacteria, so refrigerators will slow down the rate of spoilage. The temperature range for storing perishable food in the refrigerator is 3 to 5 ° C (37 to 41 ° F) when the temperature is kept several degrees above freezing point. A similar device that keeps the temperature below the freezing point of water is called a refrigerator. The refrigerator has replaced the refrigerator, which has been a common household appliance for nearly a century and a half

 &Nbsp&Nbsp; Refrigerator

 &Nbsp&Nbsp; The cooling system of food involves ice. Artificial refrigeration began in the mid-1950s and was developed in the early 19th century. In 1834, a working steam compression refrigeration system was built, and a commercial ice maker was invented in 1854. In 1913, the household refrigerator was invented. In 1923, Frigidaire introduced a standalone unit. The introduction of Freon in the 1920s expanded the refrigerator market in the 1930s. The household freezer was introduced as a separate compartment (larger than the required size for ice cubes) in 1940. Frozen food, once a luxury item, has become commonplace

Which refrigerators need to undergo 3C certification?

1. The rated voltage of single-phase appliances does not exceed 250V, and the rated voltage of other appliances does not exceed 480V

2. Refrigerators with an effective volume of ≤ 500 liters