At present, the refrigeration methods of chest freezers on the market are actually divided into three types: refrigeration, air cooling, and semiconductor refrigeration.

    Semiconductor refrigeration is mostly used for the refrigeration needs of vehicle-mounted or other miniature refrigerators, while household refrigerators use two modes of direct cooling and air cooling. At present, horizontal freezers mostly use large-area aluminum plates as the contact surface for cooling. The contact area of aluminum plates is large, and the cooling speed is fast, but the frost is serious and needs to be cleaned frequently. The direct-cooling vertical freezer mostly uses the Bondi tube as the cooling contact surface. The Bondi tube frost is lighter than the aluminum plate, the cleaning frequency is lower, the contact area is small, and the cooling speed is slow. The vertical air-cooled freezer is an evaporator + fan. Refrigeration type, fan + evaporator in the form of cooling with slight frost or no frost, the noise is slightly larger than that of direct cooling.

     In terms of functional types, there are three functional types on the market today: single freezer, single freezer, and dual mode.