What is the principle of defrosting commercial refrigerators?

In the commercial field, commercial refrigerators play a crucial role. They provide a suitable storage environment for various items such as food and medicines. The disadvantage is that after a period of use, frost often appears in the refrigerator, and at this time, defrosting operations are required. So, what is the principle of defrosting commercial refrigerators? Today, let's explore it.

First of all, we need to understand why refrigerators frost. When the moist air inside the refrigerator encounters the surface of the evaporator with a lower temperature, it will condense into frost. This is because the moisture in the air will change from a gaseous state to a solid state at low temperatures. As time goes by, the frost layer will become thicker and thicker, which will not only affect the refrigeration effect of the refrigerator but also increase energy consumption.

There are mainly the following principles for defrosting commercial refrigerators:

1.Natural defrosting

This method uses the increase in temperature inside the refrigerator after it is shut down to make the frost layer melt naturally. When the temperature inside the refrigerator rises to a certain extent, the frost layer will gradually turn into water and then be discharged from the refrigerator through the drainage hole. The advantage of natural defrosting is that it is simple and does not require additional energy consumption. However, the disadvantage is that the defrosting time is relatively long and may affect the use of the refrigerator.

2.Heating defrosting

Heating defrosting is a relatively common defrosting method in commercial refrigerators at present. It installs heating wires or heating tubes around the evaporator. When defrosting is needed, the heating device is started to increase the temperature on the surface of the evaporator, so that the frost layer melts. Heating defrosting is relatively fast and can complete the defrosting operation in a relatively short time. However, this method requires a certain amount of electrical energy consumption.

3.Hot gas defrosting

Hot gas defrosting uses the high-temperature and high-pressure gas discharged from the compressor and introduces it into the evaporator through a pipeline to increase the temperature on the surface of the evaporator and melt the frost layer. The advantage of this defrosting method is that it has a good defrosting effect and can utilize the waste heat discharged by the compressor to save energy. However, the hot gas defrosting system is relatively complex and has a higher cost.

4.Automatic defrosting

Now many commercial refrigerators are equipped with an automatic defrosting system. This system detects parameters such as the thickness and temperature of the frost layer inside the refrigerator through sensors. When certain conditions are met, the defrosting program is automatically started. The automatic defrosting system can achieve unattended operation and improve the convenience and reliability of using the refrigerator.

Through the above four aspects of analysis, the defrosting principles of commercial refrigerators mainly include natural defrosting, heating defrosting, hot gas defrosting, and automatic defrosting. Different defrosting methods have their own advantages and disadvantages. Users can choose a suitable commercial refrigerator according to their actual needs. When using a commercial refrigerator, we should also pay attention to regular defrosting operations to ensure the normal operation and service life of the refrigerator.