There is only one evaporator in a single cycle, that is, the refrigeration room, refrigeration room and transformation greenhouse all share the same refrigeration system, which will cause that when one room needs refrigeration, the other room will be forced to cool down, and the room that needs cooling will not reach the target temperature because of insufficient refrigerant. Frequent startup of refrigerator compressor will also cause problems such as increased power consumption; Of course, there is also the most serious problem, that is, it is easy to taste.

Double circulation has two evaporators, one for refrigeration and one for refrigeration. The temperature is controlled by the switch of the solenoid valve controlled by the main control board. Refrigeration and freezing control temperature independently and do not affect each other.

The refrigerator with multi circulation and three door temperature zone adopts three circulation system.

It should be noted that many refrigerators use double air circulation. Double air circuit circulation is not equal to double circulation. Double circulation refers to two evaporators, while Shuangfeng road is only two air circuits, but there is probably only one evaporator, which still has the problem of smell.