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Why does the refrigerator in the kitchen get frost?

Why does the refrigerator in the kitchen get frost?

From the perspective of the principle of refrigeration appliances, any form of refrigeration system may produce frosting. The main factors are the humidity of the air in the refrigerator and the moisture content of the food. At present, there are two types of refrigerators in the market: direct cooling and air cooling. One is frosting and the other is non-frosting. When the frost layer in the refrigerator is very thin, the heat transfer of the evaporator is not very affected. Obviously, but after the frost layer gradually thickens and the entire evaporator is covered by frost, it will seriously affect the heat transfer capacity of the evaporator and make the temperature in the box unable to drop. According to measurements, when the thickness of frost on the surface of the evaporator is greater than 10 mm, the heat transfer efficiency drops by about 30%, and the refrigeration efficiency is greatly reduced. In this case, defrost is required.


If there is a semi-automatic frosting mechanism in the catering equipment fridge, you can open the door, press the defrost button, and then close the door to let it automatically defrost. If there is no defrosting mechanism in the refrigerator, it is necessary to cut off the power supply, and then switch on the power supply for cooling after the frost layer on the evaporator has completely melted. Be careful not to hit the frost layer with wooden sticks or metal parts to prevent accidental hitting of the evaporator and unnecessary trouble.



More advanced refrigerators are equipped with a timed automatic frosting system. Automatically defrost according to the selected time interval, which can save the user the trouble of cleaning or pressing buttons. The compressor will work automatically after defrosting. The water formed by defrosting flows from the box to the water storage box at the bottom of the refrigerator through the water pipe, and evaporates automatically when heated. The water storage tray should be cleaned once a month to maintain the cleanliness and evaporation effect.


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Tips for defrosting:

(1) Check whether the compensation switch is turned on. Many refrigerators have a compensation switch. The reason for setting this switch is that when the external temperature drops below zero in winter, the temperature sensor of the refrigerator will mistakenly believe that the external temperature is the refrigerator temperature, thus losing sensitivity. Turning on the compensation switch will put the compressor in a forced working state. If the compensation switch is turned on in summer and the compressor works for a long time, icing will form.

(2) Use boiling water correctly. If the frost of the refrigerator is very thick, it needs to be removed quickly, and hot water cannot be used to directly pour the inner wall of the refrigerator. This will easily damage the inner wall of the refrigerator due to extreme thermal expansion and contraction. You can unplug the power supply, put some boiling water in the container, and let the refrigerator gradually neutralize the heat.

(3) Defrost regularly. If you find that the refrigerator at home is prone to frost, and you don't want to replace one immediately, you need to defrost the refrigerator regularly. Because the refrigerator freezes too thickly, it will affect the heat exchange efficiency between the refrigeration tube and the air. The specific cycle needs to be determined according to the degree of icing of the refrigerator at home. Generally, you should manually defrost after you see a clear layer of frost.


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