In terms of use, the car refrigerator is indeed always cooling after it is turned on. However, some compressor car refrigerators have a solution to this problem: a built-in intelligent temperature control module, when it is recognized that the refrigerator reaches the user's set temperature, the refrigeration will be converted to heat preservation.
Why is it designed like this? On the one hand, if the refrigerator is refrigerated by the compressor, if it continues to cool, the internal temperature will become lower and lower. At this time, the set temperature has no effect; on the other hand, when the set temperature is reached, it will switch from refrigeration to heat preservation. , Can be more energy-saving and energy-saving.
To understand the car refrigerator, we must start with the principle of refrigeration.
The working principle of compressor car refrigerator:
After the power is turned on, the compressor works and sucks the low-pressure, low-temperature gas refrigerant that has absorbed heat in the evaporator. After compression, it forms high-pressure, high-temperature vapor with a temperature of 55℃～58℃ and a pressure of 112～8 Pa, which enters the condenser. . Due to the throttling of the capillary tube, the pressure drops sharply.
This kind of refrigerator has strong refrigeration performance and high refrigeration efficiency; it is also the development trend of car refrigerators in the future.
The working principle of the electronic semiconductor car heating and cooling box:
The electronic semiconductor car refrigerator uses a PN junction composed of special semiconductor materials to form a thermocouple pair. A small semiconductor chip uses the Peltier principle. In the circuit composed of two different conductors, the DC circuit passes through the junction. The metal sheet joints release heat, and achieve the ultimate goal of cooling and heating through different current flows.
So is the car refrigerator always cooling? Compressor type will adjust the refrigeration temperature and refrigerator state according to the temperature control module. If the refrigerator is cooled to the preset temperature, it will automatically stop and enter the heat preservation mode; semiconductor type car refrigerator can only reach 5°C because the minimum cooling temperature is. Therefore, it will continue to refrigerate and keep it at about 5°C.