What's the difference between direct cooling of refrigerator and air cooling?

First, the principle is different: the air-cooled refrigerator is a kind of cold air, which can be generated by the evaporator built in the refrigerator and circulated by the fan, so that the cold air flows through the whole refrigerator and finally realizes refrigeration, because the existence of the fan is faster. The refrigerator is faster. The linear refrigerator is directly connected to the refrigerator and the cooling pipe of the evaporator of the refrigerator in the refrigerating chamber. When the evaporator is sucked, the air closer to the cooling pipe cools faster, forming natural air in the refrigerator. Convection, lowering the temperature. Second, the advantages are different: the advantage of direct cooling refrigerator is low failure rate because of its simple structure. In addition, the direct-cooling refrigerator naturally converges, and the humidity in the air is high, which can better preserve the moisture of food, is not easy to lose humidity, and is more economical and saves electricity. The biggest advantage of air-cooled refrigerator is automatic defrosting, good quality uniformity, relatively low humidity, relatively dry food and relatively fresh smell, but air-cooled refrigerator is the disadvantage of refrigerator and consumes more electricity. Direct-cooled refrigerator: The evaporator of the refrigerator freezer adopts a composite three-dimensional structure of multi-layer heat exchange fins, and the fins are fixed on the outer side of the tube wall of the S-shaped refrigeration coil to increase the refrigeration capacity at the top and bottom of the freezer. The freezing chamber is divided into variable temperature chambers according to the ratio of 1: 1, and the switch of refrigerant circuit is realized by controlling the on-off of bistable electromagnetic valve through temperature sensor. The variable temperature chamber can be used for freezing, soft freezing and cold storage, or closed.