Other answers*** 11 Refrigerators There are many theories about the invention of refrigerators. For example: the first domestic refrigerator named Domelre, which was born in Chicago, USA in 1913. It is more commonly said that Swedish engineers Balzer von Platen and Carls Munters took the lead in making the first refrigerator and sold the patent rights to the American Ronghua Company. However, they invented the refrigerator in 1921 respectively. , 1923, and 1926. After all, the refrigerator is mainly used to preserve food and protect the nutrients in the food. At present, consumers are becoming more and more demanding about the freshness preservation function of refrigerators: long-term freshness preservation, no loss of nutrients, no odor transfer between partitions, and no odor in the refrigerator compartment, etc., have become the most basic requirements for purchasing a refrigerator. In recent years, various refrigerator brands have been committed to improving the freshness preservation effect. As the saying goes, "Every village has its own clever trick": double cycle, -7℃, reducing temperature difference... but there is only one purpose - to keep fresh, keep fresh! LG: P2071BCQ Main preservation method: integrated circulation to avoid temperature differences. The so-called "integrated circulation method" refers to a refrigeration method that uses an evaporator, a compressor and a control box to control the temperature. The evaporator cools the freezer, and then the cold air in the freezer flows to the refrigerator. There is a control box in the refrigerator. The control box can decide whether to send cold air based on the temperature in the refrigerator. This product also uses three-dimensional circulation refrigeration, and its air supply outlet is set on the side wall of the refrigerator. This design prevents the large container in the refrigerator from blocking the cold air sent from the air outlet on the rear wall, causing a temperature difference between the front and rear, and ensures the coldness of the front bar. According to the salesperson of Dazhong Electrical Appliances, the cost of the brushed panel of this product is lower than that of titanium alloy and mirror. The price of the mirror panel of the same volume is about 10,000 yuan higher. In the case where the product performance is exactly the same, this may be another important factor why consumers choose it. Samsung: RS21NLTR Main preservation method: dual-cycle refrigeration. After some explanations by the clerk, the author understood how this dual-cycle refrigeration method is better than the ordinary method. Ordinary single-cycle refrigerators appear to be separated into refrigerators and freezers, but in fact they are connected. The temperature of the refrigerator compartment is brought up by the freezer compartment. If the door of the refrigerator compartment is opened, the cold air in the freezer compartment will flow out. This circulation method not only It consumes electricity and is prone to odor transfer. This is why the refrigerator compartment sometimes smells like raw meat from the freezer compartment. This kind of dual-cycle refrigeration refrigerator is equipped with a compressor. The refrigerator compartment and the freezer compartment each have an independent set of evaporators for refrigeration. They are used for cooling each other. They have good heat preservation effect, no odor and save electricity. In order to minimize the temperature difference, each layer of the cold storage room is equipped with air supply vents, and the three-dimensional cold flow reduces the temperature difference compared to the air supply method with the air vents at the top, thus improving the freshness preservation effect. Haier: BCD-252WBCS Main preservation method: -7℃ concept. Haier's refrigerator for meat has a variable temperature chamber in the middle. Its temperature can be adjusted arbitrarily between minus 18℃ and 10℃. Users can freely adjust this refrigerator according to their needs. The maneuverable space becomes a refrigerator or freezer. And its unique concept of -7℃ is the optimal temperature for storing meat. In an environment below -7°C, the cell wall will be punctured and water and nutrients will be lost endlessly. Frozen meat taken out from the freezer compartment of an ordinary refrigerator will ooze blood after thawing, which is evidence that the cell wall has been punctured and nutrients have been lost. Frozen meat taken out from an environment of -7°C is not only soft and easy to cut, but also does not bleed after thawing. The cell walls are intact and the nutrients are also intact. Siemens: KK28F76 Main preservation method: 0℃ is the best way to preserve fruits and vegetables. According to professionals from Siemens manufacturers, it is a good idea to have a relatively stable and independent temperature environment for the freshness room, very close to 0℃, so that the food does not freeze and can be stored for a long time. Technical difficulties. -7°C is the best environment for preserving meat, while 0°C is the perfect temperature for preserving vegetables and fruits, which ensures moisture and nutrients.
The 0°C fresh-keeping room of the Siemens refrigerator is divided into two areas. The temperature is close to 0°C, but the humidity is different: the upper meat storage area can store meat for 7-10 days; the lower vegetable and fruit storage area can Store fruits and vegetables for 15 days.