Compression refrigeration uses the reverse cycle of Caot's principle, that is, a refrigeration method of refrigeration cycle. Compression refrigeration utilizes the heat absorption and exothermic phenomena that occur during the gas-liquid phase transition of refrigerants with a very low boiling point to  wholesale car fidge  achieve refrigeration.

The whole process includes the suction and compression of the compressor, the exothermic condensation (heat dissipation) of the condenser, the throttling and pressure reduction of the throttle valve, and the endothermic vaporization (refrigeration) of the evaporator. Therefore, compression refrigeration includes four core components, namely compressor, throttle valve, condenser and evaporator, and its volume is generally large. At present, the compression refrigeration technology is relatively mature, the refrigeration efficiency is high, and the refrigeration capacity can reach -18 °C. However, due to the volume limitation of the compressor refrigeration system, the size of the vehicle-mounted compressor refrigerator is usually larger, which is more suitable for the large-volume vehicle-mounted refrigerator with large layout space.

Semiconductor refrigeration uses thermoelectric semiconductor "Peltier effect" for refrigeration, also known as electronic refrigeration. Semiconductor refrigeration belongs to electronic physical refrigeration. As shown in Figure 1, there is no refrigeration working medium and mechanical moving parts at all, thus completely solving the application problems that caot be solved by mechanical refrigeration refrigerators such as medium pollution and mechanical vibration. It is a real green environmental protection refrigeration technology. .

Semiconductor refrigerators can be directly controlled by direct current, the temperature response is fast, and the current reverse can be switched to heating mode, so one of the advantages of this refrigerator is that it can both cool and heat, which is very suitable for constant temperature control. However, limited by the maximum capacity of semiconductor refrigeration, semiconductor refrigerators usually only have refrigerating capacity and do not have freezing capacity.

The semiconductor refrigeration device is small in size, only a few millimeters in height, tens of millimeters in length and width, and only a few tenths of the volume and weight of a miniature compressor. Therefore, the semiconductor refrigeration system occupies a small space in practical applications, is easy to arrange, and is suitable for applications in narrow spaces. Due to the limited space in the interior of the car, the micro-compressor refrigeration system is large in size and extremely inconvenient to arrange, and it caot even be applied in some places with small space (such as seat armrests). The small size and light weight of the semiconductor refrigeration system make it an irreplaceable advantage in small space applications.

Another advantage of semiconductor refrigerators is that the cost of semiconductor refrigeration systems is greatly reduced compared to compressor refrigeration systems. This makes the large-scale application of on-board refrigerators possible.

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