1. Single-cycle refrigeration systems are mostly used in economical models. They are mechanical temperature control methods, and the freezing capacity is generally around 4 kilograms. 2. Dual-cycle refrigeration systems are generally priced at more than 3,000 yuan, with computerized temperature control, and the refrigerator and freezer can be independently adjusted.

The refrigerator compartment can be closed independently, and the freezing power is more than 12 kilograms.

Single cycle refrigeration: There is only one evaporator in the refrigeration system. This evaporator drives the refrigeration and freezing boxes. When the refrigerator is running, the two boxes are refrigerated at the same time. This type of refrigerator is generally controlled by the thermostat or sensor in the cold room.

The warm head controls the temperature, and the freezing temperature cannot be adjusted individually.

?Dual cycle refrigeration: There are two evaporators in the refrigeration system, which are installed in the refrigerator and freezer respectively. The solenoid valve controls the flow of the refrigerant liquid to achieve the effect of separate cooling of the refrigerator and freezer. This type of refrigerator freezer

The temperature of the refrigerator and freezer compartments can be controlled independently, thereby reducing the cooling area and making the refrigerator more energy-efficient and with stronger cooling capacity.

Extended information: Refrigeration technology The research content of refrigeration technology can be summarized into the following three aspects: ① Research on methods of obtaining low temperatures and related mechanisms as well as the corresponding refrigeration cycle.

This provides a working medium with satisfactory performance for the refrigerator.

Mechanical refrigeration can be achieved through changes in the thermal state of the refrigerant.

② Study the properties of refrigerants.

The thermophysical properties of refrigerants are the basic data for cycle analysis and calculations.

In addition, in order for the refrigerant to be used in practical applications, its general physical and chemical properties must be mastered.

Including its working principle, performance analysis, and structural design.

③Study various machinery and technical equipment necessary to realize the refrigeration cycle.

As well as the process organization and system supporting design of the refrigeration device.

In addition, there are issues with thermal insulation, automation of refrigeration units, etc.

There are tips for defrosting refrigerators: Some refrigerators need to be defrosted. Manual refrigerator defrosting is time-consuming and laborious, and the defrosting effect is very poor.

Here is a defrosting trick recommended to you.

According to the size of the refrigerator compartment, cut a piece of slightly thicker plastic film and stick it on the frosted wall of the refrigerator compartment. No need to use any glue, just stick it on.

When defrosting, temporarily remove the food from the refrigerator, peel off the plastic film and shake it, all the frost will fall off, then reattach the film, put in the food, and continue to use it.

Energy saving: stay away from heat sources and keep the space clear: every time the temperature around the refrigerator increases by 5°C, the power consumption inside will increase by 25%.

Therefore, it should be placed as far away from heat sources as possible, in a ventilated and shaded place.

Do not put hot food directly into the refrigerator until it reaches room temperature.

The food in the freezer is best packed in small plastic bags, which can be frozen quickly and will not dry out easily and prevent moisture from turning into frost. Food should not be filled too full, and there should be a gap between the food and the wall of the refrigerator to facilitate flow.

Air conditioning; frozen food, it is best to transfer it to the refrigerator to defrost in a planned way before eating.